Fingerprint detection device, backlight unit, display screen and electronic equipment
阅读说明:本技术 指纹检测装置、背光模组、显示屏和电子设备 (Fingerprint detection device, backlight unit, display screen and electronic equipment ) 是由 刘文拯 林昭枣 于 2019-12-27 设计创作,主要内容包括:提供了一种指纹检测装置、背光模组、显示屏和电子设备。所述指纹检测装置适用于具有液晶显示LCD屏的电子设备,所述LCD屏包括背光模组;所述指纹检测装置包括指纹检测模组,所述指纹检测模组用于设置在所述背光模组的下方,所述背光模组由上至下依次包括导光板、反射膜和背光板,所述背光板在所述指纹检测模组的上方设置有第一开孔,所述导光板和所述反射膜之间设置有第一介质层,所述第一介质层用于增加位于所述第一开孔的上方的所述导光板和所述反射膜之间的间隙。通过所述指纹检测装置检测指纹信息,能够减少甚至消除干扰纹路,从而提升LCD屏下光学指纹检测的性能。(Provided are a fingerprint detection device, a backlight module, a display screen and an electronic device. The fingerprint detection device is suitable for electronic equipment with a Liquid Crystal Display (LCD) screen, and the LCD screen comprises a backlight module; the fingerprint detection device comprises a fingerprint detection module, the fingerprint detection module is used for being arranged below the backlight module, the backlight module sequentially comprises a light guide plate, a reflecting film and a backlight plate from top to bottom, the backlight plate is provided with a first opening above the fingerprint detection module, a first dielectric layer is arranged between the light guide plate and the reflecting film, and the first dielectric layer is used for increasing a gap between the light guide plate and the reflecting film, and is located above the first opening. Through fingerprint detection device detects fingerprint information, can reduce or even eliminate the interference line to promote the performance that optical fingerprint detected under the LCD screen.)
1. A fingerprint detection device is characterized by being suitable for electronic equipment with a Liquid Crystal Display (LCD) screen, wherein the LCD screen comprises a backlight module;
the fingerprint detection device includes:
the fingerprint detection module is arranged below the backlight module and used for receiving an optical signal which is sent by an external light source, returns through a finger and penetrates through the backlight module, and the optical signal is used for acquiring fingerprint information of the finger;
the backlight module sequentially comprises a light guide plate, a reflecting film and a backlight plate from top to bottom, wherein the backlight plate is provided with a first opening above the fingerprint detection module, the first opening is used for transmitting an optical signal reflected by a finger to the fingerprint detection module, a first dielectric layer is arranged between the light guide plate and the reflecting film, and the first dielectric layer is used for increasing a gap between the light guide plate and the reflecting film above the first opening.
2. The fingerprint sensing device of claim 1, wherein the lower surface of the light guide plate is connected to the upper surface of the reflective film through the first dielectric layer at a region above a peripheral region of the first opening.
3. The fingerprint detection device of claim 2, wherein the lower surface of the light guide plate contacts the upper surface of the reflective film at an area outside the first medium layer.
4. The fingerprint sensing apparatus of claim 2 or 3, wherein the first dielectric layer comprises a plurality of discrete dielectric layers.
5. The fingerprint detection device according to any one of claims 2 to 4, wherein an upper surface of the backlight plate extends in a direction away from the reflection film in a peripheral region of the first opening.
6. The fingerprint sensing device of claim 5, wherein the backlight plate includes a first upper surface located around the first opening and a second upper surface spaced apart from the first upper surface, the first upper surface being parallel to the second upper surface, and the first upper surface being connected to the second upper surface by a slope.
7. The fingerprint detection device of any one of claims 2 to 6, wherein the backlight panel has a thickness in a region around the first aperture that is less than a thickness of the backlight panel in other regions.
8. The fingerprint detection device of claim 7, wherein a lower surface of the backlight is parallel to a lower surface of the light guide plate.
9. The fingerprint detection device of any one of claims 2 to 6, wherein the thickness of each region of the backlight panel is the same.
10. The fingerprint detection device according to claim 1, wherein the lower surface of the light guide plate is connected to the upper surface of the reflection film through the first dielectric layer, the first dielectric layer is configured to increase a gap between the light guide plate and the reflection film, the first dielectric layer is provided with a second opening above the first opening, and an aperture of the second opening is greater than or equal to an aperture of the first opening.
11. The fingerprint sensing apparatus of any one of claims 1 to 10, wherein the first dielectric layer is a transparent dielectric layer or a non-transparent dielectric layer.
12. The fingerprint detection apparatus of any one of claims 1 to 11, wherein the first medium layer is a double-sided adhesive layer, or the material of the first medium layer is at least one of the following materials: polycarbonate PC, acrylonitrile butadiene acrylate copolymer ABA, polymethyl methacrylate PMMA and polyethylene terephthalate PET.
13. The fingerprint sensing device of any one of claims 1 to 12, wherein a second dielectric layer is disposed between the reflective film and the backlight panel, the second dielectric layer being configured to secure an area of the reflective film above the first aperture to the backlight panel.
14. The fingerprint sensing device of claim 13, wherein the lower surface of the reflective film is secured to the upper surface of the backlight panel by the second dielectric layer in an area above a surrounding area of the first aperture.
15. The fingerprint sensing device according to claim 14, wherein a third dielectric layer is provided on the reflective film and the backlight plate in a region outside the second dielectric layer, and a lower surface of the reflective film contacts the backlight plate through the third dielectric layer.
16. The fingerprint sensing device of claim 15, wherein the third dielectric layer has a thickness greater than a thickness of the second dielectric layer to increase a gap between the light guide plate and the reflective film.
17. The fingerprint sensing apparatus of any one of claims 13-16, wherein the second dielectric layer comprises a plurality of discrete dielectric layers.
18. The fingerprint sensing device of claim 13, wherein the lower surface of the reflective film is fixed to the upper surface of the backlight plate by the second dielectric layer, the second dielectric layer is provided with a third opening above the first opening, and the aperture of the third opening is greater than or equal to the aperture of the first opening.
19. The fingerprint sensing device of any one of claims 13-18, wherein the second dielectric layer is a double-sided adhesive layer.
20. The fingerprint detection apparatus according to any one of claims 1 to 19, wherein the middle frame of the electronic device is provided with a fourth opening for transmitting the optical signal reflected by the finger to the fingerprint detection module, and the fingerprint detection module is fixed to a peripheral area of the lower surface of the middle frame of the electronic device, the peripheral area being located in the fourth opening, so that a distance between the fingerprint detection module and the reflective film is within a range of 150um to 300 um.
21. The fingerprint detection apparatus of any one of claims 1-20, wherein the fingerprint detection module is an optical fingerprint detection module, and the optical fingerprint detection module comprises at least one optical fingerprint sensor.
22. A fingerprint detection device is characterized by being suitable for electronic equipment with a Liquid Crystal Display (LCD) screen, wherein the LCD screen comprises a backlight module;
the fingerprint detection device includes:
the fingerprint detection module is arranged below the backlight module and used for receiving an optical signal which is sent by an external light source, returns through a finger and penetrates through the backlight module, and the optical signal is used for acquiring fingerprint information of the finger;
the backlight module comprises a light guide plate, a reflecting film and a backlight plate from top to bottom in sequence, wherein the backlight plate is provided with a first opening above the fingerprint detection module, the first opening is used for transmitting an optical signal reflected by a finger to the fingerprint detection module, a second dielectric layer is arranged between the reflecting film and the backlight plate, and the second dielectric layer is used for fixing the reflecting film above the first opening to the backlight plate.
23. The fingerprint sensing device of claim 22, wherein the lower surface of the reflective film is secured to the upper surface of the backlight panel by the second dielectric layer in an area above a surrounding area of the first aperture.
24. The fingerprint sensing device of claim 23, wherein a third dielectric layer is disposed on the reflective film and the backlight plate in an area outside the second dielectric layer, and a lower surface of the reflective film contacts the backlight plate through the third dielectric layer.
25. The fingerprint sensing device of claim 24, wherein the third dielectric layer has a thickness greater than a thickness of the second dielectric layer to increase a gap between the light guide plate and the reflective film.
26. The fingerprint sensing apparatus of any one of claims 23-25, wherein the second dielectric layer comprises a plurality of discrete dielectric layers.
27. The fingerprint sensing device of claim 22, wherein the lower surface of the reflective film is secured to the upper surface of the backlight panel by the second dielectric layer, the second dielectric layer being provided with a third opening above the first opening, the third opening having an aperture that is greater than or equal to the aperture of the first opening.
28. The fingerprint sensing device of any one of claims 22-27, wherein the second dielectric layer is a double-sided adhesive layer.
29. The fingerprint detection apparatus according to any one of claims 22 to 28, wherein the middle frame of the electronic device is provided with a fourth opening for transmitting the optical signal reflected by the finger to the fingerprint detection module, and the fingerprint detection module is fixed to a peripheral area of the lower surface of the middle frame of the electronic device, the peripheral area being located in the fourth opening, so that a distance between the fingerprint detection module and the reflective film is in a range of 150um to 300 um.
30. The fingerprint detection apparatus of any one of claims 22-29, wherein the fingerprint detection module is an optical fingerprint detection module, and wherein the optical fingerprint detection module comprises at least one optical fingerprint sensor.
31. The backlight module is characterized by being suitable for electronic equipment with a Liquid Crystal Display (LCD) screen, wherein the LCD screen comprises the backlight module;
the backlight module sequentially comprises a light guide plate, a reflecting film and a backlight plate from top to bottom, wherein the backlight plate is provided with a first opening, a first dielectric layer is arranged between the light guide plate and the reflecting film, and the first dielectric layer is used for increasing a gap between the light guide plate and the reflecting film, which is positioned above the first opening.
32. The backlight module according to claim 31, wherein the lower surface of the light guide plate is connected to the upper surface of the reflective film through the first dielectric layer at a region above the peripheral region of the first opening.
33. The backlight module according to claim 32, wherein the lower surface of the light guide plate contacts the upper surface of the reflective film at a region outside the first dielectric layer.
34. The backlight module according to claim 32 or 33, wherein the first dielectric layer comprises a plurality of discrete dielectric layers.
35. The backlight module according to any one of claims 32-34, wherein the upper surface of the backlight plate extends in a direction away from the reflective film in a region around the first opening.
36. The backlight module as claimed in claim 35, wherein the backlight plate includes a first upper surface located at a peripheral region of the first opening and a second upper surface spaced apart from the first upper surface, the first upper surface is parallel to the second upper surface, and the first upper surface is connected to the second upper surface by a slope.
37. The backlight module according to any one of claims 32 to 36, wherein the thickness of the backlight plate in the area around the first opening is smaller than the thickness of the backlight plate in other areas.
38. A backlight module according to claim 37, wherein the lower surface of the backlight plate is parallel to the lower surface of the light guide plate.
39. A backlight module according to any one of claims 32-36, wherein the regions of the backlight panel are of the same thickness.
40. The backlight module as claimed in claim 31, wherein the lower surface of the light guide plate is connected to the upper surface of the reflective film through the first dielectric layer, the first dielectric layer is used for increasing a gap between the light guide plate and the reflective film, the first dielectric layer is provided with a second opening above the first opening, and an aperture of the second opening is greater than or equal to an aperture of the first opening.
41. The backlight module according to any one of claims 31-40, wherein the first dielectric layer is a transparent dielectric layer or a non-transparent dielectric layer.
42. The backlight module according to any one of claims 31 to 41, wherein the first dielectric layer is a double-sided adhesive layer, or the material of the first dielectric layer is at least one of the following materials: polycarbonate PC, acrylonitrile butadiene acrylate copolymer ABA, polymethyl methacrylate PMMA and polyethylene terephthalate PET.
43. The backlight module according to any one of claims 31 to 42, wherein a second dielectric layer is disposed between the reflective film and the backlight plate, the second dielectric layer being used for fixing the region of the reflective film above the first opening to the backlight plate.
44. The backlight module according to claim 43, wherein the lower surface of the reflective film is fixed to the upper surface of the backlight plate through the second dielectric layer at a region above the peripheral region of the first opening.
45. The backlight module according to claim 43, wherein a third dielectric layer is disposed on the reflective film and the backlight plate in an area outside the second dielectric layer, and a lower surface of the reflective film contacts the backlight plate through the third dielectric layer.
46. The backlight module as claimed in claim 45, wherein the third dielectric layer has a thickness greater than that of the second dielectric layer to increase a gap between the light guide plate and the reflective film.
47. The backlight module according to any one of claims 43-46, wherein the second dielectric layer comprises a plurality of discrete dielectric layers.
48. The backlight module according to claim 43, wherein the lower surface of the reflective film is fixed to the upper surface of the backlight plate through the second dielectric layer, the second dielectric layer is provided with a third opening above the first opening, and the aperture of the third opening is greater than or equal to that of the first opening.
49. The backlight module according to any one of claims 43 to 48, wherein the second dielectric layer is a double-sided adhesive layer.
50. The backlight module according to any one of claims 31-49, wherein the electronic device comprises a fingerprint detection module, the middle frame of the electronic device is provided with a fourth opening, the fourth opening is used for transmitting the light signal reflected by the finger to the fingerprint detection module, and the fingerprint detection module is fixed to a peripheral area of the lower surface of the middle frame of the electronic device, which is located in the fourth opening, so that a distance between the fingerprint detection module and the reflective film is in a range of 150-300 um.
51. The backlight module according to claim 50, wherein the fingerprint detection module is an optical fingerprint detection module, and the optical fingerprint detection module comprises at least one optical fingerprint sensor.
52. The backlight module is characterized by being suitable for electronic equipment with a Liquid Crystal Display (LCD) screen, wherein the LCD screen comprises the backlight module;
the backlight module comprises a light guide plate, a reflecting film and a backlight plate from top to bottom in sequence, wherein the backlight plate is provided with a first hole, a second dielectric layer is arranged between the reflecting film and the backlight plate, and the second dielectric layer is used for fixing the backlight plate to the backlight plate.
53. The backlight module according to claim 52, wherein the lower surface of the reflective film is connected to the upper surface of the backlight plate through the second dielectric layer at a region above the surrounding region of the first opening.
54. The backlight module according to claim 53, wherein a third dielectric layer is disposed on the reflective film and the backlight plate at an area outside the second dielectric layer, and a lower surface of the reflective film contacts the backlight plate through the third dielectric layer.
55. The backlight module according to claim 54, wherein the thickness of the third dielectric layer is greater than the thickness of the second dielectric layer to increase the gap between the light guide plate and the reflective film.
56. The backlight module according to any one of claims 52-55, wherein the second dielectric layer comprises a plurality of discrete dielectric layers.
57. The backlight module according to claim 52, wherein the lower surface of the reflective film is connected to the upper surface of the backlight plate through the second dielectric layer, the second dielectric layer is provided with a third opening above the first opening, and the aperture of the third opening is greater than or equal to the aperture of the first opening.
58. The backlight module according to any one of claims 52-57, wherein the second dielectric layer is a double-sided adhesive layer.
59. The backlight module according to any one of claims 52-58, wherein the electronic device comprises a fingerprint detection module, the middle frame of the electronic device is provided with a fourth opening, the fourth opening is used for transmitting the light signal reflected by the finger to the fingerprint detection module, and the fingerprint detection module is fixed to a peripheral area of the lower surface of the middle frame of the electronic device, which is located in the fourth opening, so that a distance between the fingerprint detection module and the reflective film is in a range of 150-300 um.
60. The backlight module according to claim 59, wherein the fingerprint detection module is an optical fingerprint detection module, and the optical fingerprint detection module comprises at least one optical fingerprint sensor.
61. A display screen, comprising:
a backlight module according to any one of claims 31 to 60.
62. An electronic device, comprising:
the display screen of claim 61.
Technical Field
The embodiment of the application relates to the field of fingerprint identification under a screen, and more particularly relates to a fingerprint detection device, a backlight module, a display screen and an electronic device.
Background
Currently, a Liquid Crystal Display (LCD) screen includes a backlight module and a Liquid Crystal panel, wherein the backlight module provides a uniform light source for the screen, and the Liquid Crystal panel plays a role in displaying images. Optical fingerprint identification scheme is in order to realize optical fingerprint identification with fingerprint identification module setting in backlight unit's below based on the screen of LCD, and wherein, backlight unit is multilayer membrane material structure, and the inhomogeneous problem of contact appears easily in deformation between the membrane material, leads to producing the forming condition who disturbs line (film interference), and like this, the fingerprint image of gathering at fingerprint identification module can have the interference line, influences the fingerprint identification performance.
Therefore, how to eliminate or reduce interference patterns to improve the performance of optical fingerprint recognition under LCD screens is an urgent problem to be solved.
Disclosure of Invention
The utility model provides a fingerprint detection device, backlight unit, display screen and electronic equipment can reduce or even eliminate the interference line to promote the performance that optics fingerprint detected under the LCD screen.
In a first aspect, a fingerprint detection device is provided, which is suitable for an electronic device having a Liquid Crystal Display (LCD) screen, wherein the LCD screen comprises a backlight module;
the fingerprint detection device includes:
the fingerprint detection module is arranged below the backlight module and used for receiving an optical signal which is sent by an external light source, returns through a finger and penetrates through the backlight module, and the optical signal is used for acquiring fingerprint information of the finger;
the backlight module sequentially comprises a light guide plate, a reflecting film and a backlight plate from top to bottom, wherein the backlight plate is provided with a first opening above the fingerprint detection module, the first opening is used for transmitting an optical signal reflected by a finger to the fingerprint detection module, a first dielectric layer is arranged between the light guide plate and the reflecting film, and the first dielectric layer is used for increasing a gap between the light guide plate and the reflecting film above the first opening.
Based on the mechanism of generating newton rings, if the backlight panel is provided with the first opening, the reflective film above the first opening is not supported and is deformed, for example, a curved surface with a radius of curvature is generated near the lower surface of the light guide plate, and the structure composed of the light guide plate and the deformed reflective film is similar to the structure composed of the inner surface of a plane mirror and a convex lens for generating newton rings. At this time, if two lines of waves (namely light rays or light signals) reflected between the lower surface of the light guide plate and the upper surface of the reflecting film meet each other, and the wave path difference when the two lines of waves meet each other is even multiple of half wavelength, the two lines of waves are enhanced after being superposed, and then bright stripes appear; if two lines of reflected waves meet between the lower surface of the light guide plate and the upper surface of the reflecting film and the wave path difference is odd times of half wavelength when the two lines of reflected waves meet, the two lines of reflected waves are weakened after being superposed, and then dark stripes appear, so that the fingerprint image detected by the fingerprint detection device can have stripes (namely Newton rings) with alternate light and shade.
Through the light guide plate with set up between the reflectance coating first matrix layer can increase and be located the top of first trompil the light guide plate with clearance between the reflectance coating, it is corresponding, can increase the light guide plate lower surface with take place the optical path difference of the light of reflection between the reflectance coating upper surface, and then reduce the interval of newton's ring for the interference fringe of the fingerprint image that the fingerprint detection module detected reduces or even disappears, and then promote fingerprint detection effect with fingerprint detection device's performance.
In other words, by increasing the gap between the light guide plate and the reflective film above the first opening, the formation condition of newton's rings can be broken to improve the fingerprint detection effect and the performance of the fingerprint detection device.
In some possible implementations, the lower surface of the light guide plate is connected to the upper surface of the reflective film through the first dielectric layer in a region located above a peripheral region of the first opening.
The first medium layer is arranged between the light guide plate and the reflection film and is positioned on the upper surface of the peripheral area of the first opening of the backlight plate, so that a sufficient gap can be ensured between the area of the reflection film which is easy to deform and the light guide plate; the sufficient clearance can guarantee to destroy the forming condition of Newton's ring, and then, promote fingerprint detection effect and fingerprint detection device's performance.
In some possible implementations, the lower surface of the light guide plate contacts the upper surface of the reflective film in a region located outside the first dielectric layer.
The lower surface of the light guide plate is in contact with the upper surface of the reflecting film in an area located outside the first medium layer, and equivalently, only a gap between the light guide plate and the reflecting film above the first opening is increased, so that not only can the fingerprint detection effect be improved, but also the performance of the fingerprint detection device can be improved, the occupied space of the first medium layer can be reduced, and the cost of the backlight module can be reduced.
In some possible implementations, the first dielectric layer includes a plurality of discrete dielectric layers.
In some possible implementations, the upper surface of the backlight panel extends in a direction away from the reflective film in a peripheral region of the first aperture.
The upper surface of the backlight plate is configured to extend in a direction away from the reflective film in the peripheral area of the first opening, so that not only can a containing space be provided for the first dielectric layer, but also an adjusting space can be provided for the gap between the light guide plate and the reflective film.
In some possible implementations, the backlight plate includes a first upper surface located at a peripheral region of the first hole and a second upper surface spaced apart from the first upper surface, the first upper surface is parallel to the second upper surface, and the first upper surface is connected to the second upper surface by a slope.
The upper surface between the first upper surface and the second upper surface of the backlight plate is designed to be an inclined plane, so that the reflecting film can be prevented from being damaged in an area between the first upper surface and the second upper surface, and the resistance generated by the backlight plate when the reflecting film moves towards the direction far away from the light guide plate can be reduced.
In some possible implementations, the thickness of the backlight plate in the area around the first aperture is smaller than the thickness of the backlight plate in other areas.
The thickness of the backlight plate in the area around the first opening is smaller than the thickness of the backlight plate in other areas, and equivalently, the thickness of the backlight module in the area around the first opening is reduced, so that not only can a containing space be provided for the first dielectric layer, but also an adjusting space can be provided for a gap between the light guide plate and the reflecting film.
In some possible implementations, a lower surface of the backlight plate is parallel to a lower surface of the light guide plate.
The lower surface of the backlight plate is parallel to the lower surface of the light guide plate, namely the lower surface of the backlight plate is a plane, so that the attractiveness of the backlight plate can be improved, and the complexity of installing the backlight module can be reduced.
In some possible implementations, the thickness of each region of the backlight panel is the same.
The thickness of each area of the backlight plate is designed to be the same, so that the areas of the backlight plate have the same strength, the occupied space of the backlight module in the area without the first medium layer can be reduced, and the cost of the backlight module can be reduced.
In some possible implementation manners, the lower surface of the light guide plate is connected to the upper surface of the reflective film through the first dielectric layer, the first dielectric layer is used for increasing a gap between the light guide plate and the reflective film, the first dielectric layer is provided with a second opening above the first opening, and an aperture of the second opening is greater than or equal to an aperture of the first opening.
The first dielectric layer is configured to cover the reflective film, so that the first dielectric layer has sufficient strength to ensure a gap between the light guide plate and the reflective film, and further ensure the performance of the fingerprint detection device.
In addition, will the aperture design of second trompil is for being more than or equal to the aperture of first trompil not only will be via the optical signal of finger reflection can transmit to the fingerprint detection module, can also enlarge the visual field and the visual angle of fingerprint detection module make the fingerprint detection module can receive sufficient optical signal, and then promote the fingerprint identification effect.
In some possible implementations, the first dielectric layer is a transparent dielectric layer or a non-transparent dielectric layer.
In some possible implementations, the first dielectric layer is a double-sided adhesive layer, or the material of the first dielectric layer is at least one of the following materials: polycarbonate PC, acrylonitrile butadiene acrylate copolymer ABA, polymethyl methacrylate PMMA and polyethylene terephthalate PET.
Will first dielectric layer design is double-sided adhesive layer, not only can guarantee the light guide plate with clearance between the reflectance coating can also make the reflectance coating is difficult to produce deformation, has avoided as far as the light guide plate with the reflectance coating forms the structure that is used for producing newton's ring, in order to guarantee fingerprint detection device's performance and fingerprint detection effect.
In some possible implementations, a second dielectric layer is disposed between the reflective film and the backlight panel, and the second dielectric layer is used to fix a region of the reflective film above the first opening to the backlight panel.
The second medium layer is designed between the reflecting film and the backlight plate, and the second medium layer is constructed to be used for fixing the area, located above the first hole, of the reflecting film to the backlight plate, so that the reflecting film is not easy to deform, the light guide plate and the reflecting film are prevented from forming a structure for generating Newton rings as far as possible, and the performance and the fingerprint detection effect of the fingerprint detection device are guaranteed.
In some possible implementations, the lower surface of the reflective film is fixed to the upper surface of the backlight plate through the second dielectric layer in a region located above a surrounding region of the first opening.
In some possible implementation manners, a third dielectric layer is disposed in an area of the reflective film and the backlight plate outside the second dielectric layer, and a lower surface of the reflective film contacts the backlight plate through the third dielectric layer.
The third medium layer is arranged in the area of the reflection film and the area of the backlight plate outside the second medium layer, and equivalently, the reflection film is supported by the third medium layer and the second medium layer, so that the stress of the reflection film is uniform, the deformation of the reflection film is avoided as much as possible, the light guide plate and the reflection film are prevented from forming a structure for generating Newton rings, and the performance and the fingerprint detection effect of the fingerprint detection device are ensured.
In some possible implementations, a thickness of the third dielectric layer is greater than a thickness of the second dielectric layer to increase a gap between the light guide plate and the reflective film.
The thickness of the third dielectric layer is larger than that of the second dielectric layer, so that a gap between the light guide plate and the reflecting film can be effectively ensured, and the gap between the light guide plate and the reflecting film at least comprises the gap of the third dielectric layer minus the gap of the second dielectric layer.
In some possible implementations, the second dielectric layer includes a plurality of discrete dielectric layers.
In some possible implementations, the lower surface of the reflective film is fixed to the upper surface of the backlight panel through the second dielectric layer, the second dielectric layer is provided with a third opening above the first opening, and an aperture of the third opening is greater than or equal to an aperture of the first opening.
In some possible implementations, the second dielectric layer is a double-sided adhesive layer.
In some possible implementation manners, the center of the electronic device is provided with a fourth opening, the fourth opening is used for transmitting the light signal reflected by the finger to the fingerprint detection module, the fingerprint detection module is fixed to the lower surface of the center of the electronic device and is located in the peripheral area of the fourth opening, so that the fingerprint detection module and the distance between the reflective films are located within the range of 150 um-300 um.
Through the center installation the fingerprint detection module, and will the fingerprint detection module with distance structure between the reflectance coating is for being located 150um ~ 300um scope, can not guarantee the image distance of fingerprint detection module can also avoid the fingerprint detection module contactless the reflectance coating has avoided when electronic equipment sends the collision or vibrations, the fingerprint detection module damages the reflectance coating.
In some possible implementation manners, the fingerprint detection module is an optical fingerprint detection module, and the optical fingerprint detection module comprises at least one optical fingerprint sensor.
In a second aspect, a fingerprint detection device is provided, which is suitable for an electronic device having a liquid crystal display LCD screen, where the LCD screen includes a backlight module;
the fingerprint detection device includes:
the fingerprint detection module is arranged below the backlight module and used for receiving an optical signal which is sent by an external light source, returns through a finger and penetrates through the backlight module, and the optical signal is used for acquiring fingerprint information of the finger;
the backlight module comprises a light guide plate, a reflecting film and a backlight plate from top to bottom in sequence, wherein the backlight plate is provided with a first opening above the fingerprint detection module, the first opening is used for transmitting an optical signal reflected by a finger to the fingerprint detection module, a second dielectric layer is arranged between the reflecting film and the backlight plate, and the second dielectric layer is used for fixing the reflecting film above the first opening to the backlight plate.
The second medium layer is designed between the reflecting film and the backlight plate, and the second medium layer is constructed to be used for fixing the area, located above the first hole, of the reflecting film to the backlight plate, so that the reflecting film is not easy to deform, the light guide plate and the reflecting film are prevented from forming a structure for generating Newton rings as far as possible, and the performance and the fingerprint detection effect of the fingerprint detection device are guaranteed.
In some possible implementations, the lower surface of the reflective film is fixed to the upper surface of the backlight plate through the second dielectric layer in a region located above a surrounding region of the first opening.
In some possible implementation manners, a third dielectric layer is disposed in an area of the reflective film and the backlight plate outside the second dielectric layer, and a lower surface of the reflective film contacts the backlight plate through the third dielectric layer.
The third medium layer is arranged in the area of the reflection film and the area of the backlight plate outside the second medium layer, and equivalently, the reflection film is supported by the third medium layer and the second medium layer, so that the stress of the reflection film is uniform, the deformation of the reflection film is avoided as much as possible, the light guide plate and the reflection film are prevented from forming a structure for generating Newton rings, and the performance and the fingerprint detection effect of the fingerprint detection device are ensured.
In some possible implementations, a thickness of the third dielectric layer is greater than a thickness of the second dielectric layer to increase a gap between the light guide plate and the reflective film.
The thickness of the third dielectric layer is larger than that of the second dielectric layer, so that a gap between the light guide plate and the reflecting film can be effectively ensured, and the gap between the light guide plate and the reflecting film at least comprises the gap of the third dielectric layer minus the gap of the second dielectric layer.
In some possible implementations, the second dielectric layer includes a plurality of discrete dielectric layers.
In some possible implementations, the lower surface of the reflective film is fixed to the upper surface of the backlight panel through the second dielectric layer, the second dielectric layer is provided with a third opening above the first opening, and an aperture of the third opening is greater than or equal to an aperture of the first opening.
In some possible implementations, the second dielectric layer is a double-sided adhesive layer.
In some possible implementation manners, the center of the electronic device is provided with a fourth opening, the fourth opening is used for transmitting the light signal reflected by the finger to the fingerprint detection module, the fingerprint detection module is fixed to the lower surface of the center of the electronic device and is located in the peripheral area of the fourth opening, so that the fingerprint detection module and the distance between the reflective films are located within the range of 150 um-300 um.
Through the center installation the fingerprint detection module, and will the fingerprint detection module with distance structure between the reflectance coating is for being located 150um ~ 300um scope, can not guarantee the image distance of fingerprint detection module can also avoid the fingerprint detection module contactless the reflectance coating has avoided when electronic equipment sends the collision or vibrations, the fingerprint detection module damages the reflectance coating.
In some possible implementation manners, the fingerprint detection module is an optical fingerprint detection module, and the optical fingerprint detection module comprises at least one optical fingerprint sensor.
In a third aspect, a backlight module is provided, which is suitable for an electronic device having a liquid crystal display LCD screen, where the LCD screen includes the backlight module;
the backlight module sequentially comprises a light guide plate, a reflecting film and a backlight plate from top to bottom, wherein the backlight plate is provided with a first opening, a first dielectric layer is arranged between the light guide plate and the reflecting film, and the first dielectric layer is used for increasing a gap between the light guide plate and the reflecting film, which is positioned above the first opening.
In some possible implementations, the lower surface of the light guide plate is connected to the upper surface of the reflective film through the first dielectric layer in a region located above a peripheral region of the first opening.
In some possible implementations, the lower surface of the light guide plate contacts the upper surface of the reflective film in a region located outside the first dielectric layer.
In some possible implementations, the first dielectric layer includes a plurality of discrete dielectric layers.
In some possible implementations, the upper surface of the backlight panel extends in a direction away from the reflective film in a peripheral region of the first aperture.
In some possible implementations, the backlight plate includes a first upper surface located at a peripheral region of the first hole and a second upper surface spaced apart from the first upper surface, the first upper surface is parallel to the second upper surface, and the first upper surface is connected to the second upper surface by a slope.
In some possible implementations, the thickness of the backlight plate in the area around the first aperture is smaller than the thickness of the backlight plate in other areas.
In some possible implementations, a lower surface of the backlight plate is parallel to a lower surface of the light guide plate.
In some possible implementations, the thickness of each region of the backlight panel is the same.
In some possible implementation manners, the lower surface of the light guide plate is connected to the upper surface of the reflective film through the first dielectric layer, the first dielectric layer is used for increasing a gap between the light guide plate and the reflective film, the first dielectric layer is provided with a second opening above the first opening, and an aperture of the second opening is greater than or equal to an aperture of the first opening.
In some possible implementations, the first dielectric layer is a transparent dielectric layer or a non-transparent dielectric layer.
In some possible implementations, the first dielectric layer is a double-sided adhesive layer, or the material of the first dielectric layer is at least one of the following materials: polycarbonate PC, acrylonitrile butadiene acrylate copolymer ABA, polymethyl methacrylate PMMA and polyethylene terephthalate PET.
In some possible implementations, a second dielectric layer is disposed between the reflective film and the backlight panel, and the second dielectric layer is used to fix a region of the reflective film above the first opening to the backlight panel.
In some possible implementations, the lower surface of the reflective film is fixed to the upper surface of the backlight plate through the second dielectric layer in a region located above a surrounding region of the first opening.
In some possible implementation manners, a third dielectric layer is disposed in an area of the reflective film and the backlight plate outside the second dielectric layer, and a lower surface of the reflective film contacts the backlight plate through the third dielectric layer.
In some possible implementations, a thickness of the third dielectric layer is greater than a thickness of the second dielectric layer to increase a gap between the light guide plate and the reflective film.
In some possible implementations, the second dielectric layer includes a plurality of discrete dielectric layers.
In some possible implementations, the lower surface of the reflective film is fixed to the upper surface of the backlight panel through the second dielectric layer, the second dielectric layer is provided with a third opening above the first opening, and an aperture of the third opening is greater than or equal to an aperture of the first opening.
In some possible implementations, the second dielectric layer is a double-sided adhesive layer.
In some possible implementation manners, the electronic equipment includes the fingerprint detection module, the center of electronic equipment is provided with the fourth trompil, the fourth trompil is used for via the optical signal transmission who points the reflection extremely the fingerprint detection module, the fingerprint detection module is fixed to being located of the lower surface of the center of electronic equipment the region around the fourth trompil makes the fingerprint detection module with distance is located 150um ~ 300um within range between the reflectance coating.
In some possible implementation manners, the fingerprint detection module is an optical fingerprint detection module, and the optical fingerprint detection module comprises at least one optical fingerprint sensor.
In a fourth aspect, a backlight module is provided, which in some possible implementations is adapted for an electronic device having a liquid crystal display, LCD, screen, the LCD screen including a backlight module;
the backlight module comprises a light guide plate, a reflecting film and a backlight plate from top to bottom in sequence, wherein the backlight plate is provided with a first hole, a second dielectric layer is arranged between the reflecting film and the backlight plate, and the second dielectric layer is used for fixing the backlight plate to the backlight plate.
In some possible implementations, the lower surface of the reflective film is connected to the upper surface of the backlight plate through the second dielectric layer in a region located above a surrounding region of the first opening.
In some possible implementation manners, a third dielectric layer is disposed in an area of the reflective film and the backlight plate outside the second dielectric layer, and a lower surface of the reflective film contacts the backlight plate through the third dielectric layer.
In some possible implementations, a thickness of the third dielectric layer is greater than a thickness of the second dielectric layer to increase a gap between the light guide plate and the reflective film.
In some possible implementations, the second dielectric layer includes a plurality of discrete dielectric layers.
In some possible implementations, the lower surface of the reflective film is connected to the upper surface of the backlight plate through the second dielectric layer, the second dielectric layer is provided with a third opening above the first opening, and an aperture of the third opening is greater than or equal to an aperture of the first opening.
In some possible implementations, the second dielectric layer is a double-sided adhesive layer.
In some possible implementation manners, the electronic equipment includes the fingerprint detection module, the center of electronic equipment is provided with the fourth trompil, the fourth trompil is used for via the optical signal transmission who points the reflection extremely the fingerprint detection module, the fingerprint detection module is fixed to being located of the lower surface of the center of electronic equipment the region around the fourth trompil makes the fingerprint detection module with distance is located 150um ~ 300um within range between the reflectance coating.
In some possible implementation manners, the fingerprint detection module is an optical fingerprint detection module, and the optical fingerprint detection module comprises at least one optical fingerprint sensor.
In a fifth aspect, a display screen is provided, which includes the backlight module described in any one of the possible implementation manners of the third aspect or the fourth aspect.
In a sixth aspect, an electronic device is provided, which includes the display screen of the fifth aspect.
Drawings
Fig. 1 is a schematic plan view of an electronic device to which the present application may be applied.
Fig. 2 is a schematic cross-sectional view of the electronic device shown in fig. 1.
Fig. 3 is a schematic structural diagram of an electronic device including a backlight module according to an embodiment of the present application.
Fig. 4 is a schematic structural view of the electronic device shown in fig. 3 after the reflection film transmits the deformation.
Fig. 5 to 21 are schematic block diagrams of an electronic device including a fingerprint detection apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
The technical scheme of the embodiment of the application can be applied to various electronic devices. Such as portable or mobile computing devices, e.g., smart phones, laptops, tablets, gaming devices, etc., and other electronic devices, e.g., electronic databases, automobiles, Automated Teller Machines (ATMs), etc. However, the present embodiment is not limited thereto.
The technical scheme of the embodiment of the application can be used for the biological feature recognition technology. The biometric technology includes, but is not limited to, fingerprint recognition, palm print recognition, iris recognition, face recognition, and living body recognition. For convenience of explanation, the fingerprint identification technology is described as an example below.
The technical scheme of the embodiment of the application can be used for the under-screen fingerprint identification technology and the in-screen fingerprint identification technology.
Fingerprint identification technique indicates to install the fingerprint detection module in the display screen below under the screen to realize carrying out the fingerprint identification operation in the display area of display screen, need not set up the fingerprint collection region in the positive region except that the display area of electronic equipment. Specifically, the fingerprint detection module uses the light that returns from the top surface of electronic equipment's display module to carry out fingerprint response and other response operations. This returned light carries information about objects (e.g., fingers) in contact with or in proximity to the top surface of the display assembly, and the fingerprint detection module located below the display assembly performs underscreen fingerprint identification by capturing and detecting this returned light. The fingerprint detection module can be designed to realize desired optical imaging by properly configuring an optical element for collecting and detecting returned light, so as to detect fingerprint information of the finger.
Correspondingly, (In-display) fingerprint identification technique means installs fingerprint detection module or partial fingerprint detection module inside the display screen to realize carrying out the fingerprint identification operation In the display area of display screen, need not set up the fingerprint collection region In the positive region except that the display area of electronic equipment.
Fig. 1 and fig. 2 are schematic diagrams illustrating an
As shown in fig. 2, the
The
In addition, the
Specifically, the
As shown in fig. 2, the
Of course, in other alternative embodiments, the
In some embodiments of this application,
In other embodiments of the present application, the
It should be understood that the embodiments of the present application do not limit the specific form of the plurality of sensor chips.
For example, the plurality of sensor chips may be sensor chips that are individually packaged, or may be a plurality of chips (Die) packaged in the same chip package.
For another example, the plurality of sensor chips may be formed on different regions of the same chip by a semiconductor process.
As shown in fig. 2, the optical sensing array of the
The scheme is only suitable for OLED, the LCD is not suitable for the scheme, and related contents are deleted. The same is as follows. For example, the light path design of converging light or the light path design of reflecting light is carried out through the macro lens, so that the area of the
The following is an exemplary description of the optical path design of the
When a finger touches, presses, or approaches (collectively referred to as pressing in this application for convenience of description) the
Therefore, when the user needs to perform fingerprint unlocking or other fingerprint verification on the
The excitation light source for fingerprint identification can adopt an internal light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the optical fingerprint system of the
As shown in fig. 2, the
The
As shown in fig. 2, a
The
Fig. 3 is a schematic structural diagram of an underscreen fingerprint identification apparatus according to an embodiment of the present application.
As shown in fig. 3, the
It should be understood that, in the embodiment of the present application, the infrared light signal received by the
It should be noted that, in the embodiment of the present application, the infrared light signal emitted by the infrared
In other words, the optical signal for fingerprint recognition uses an infrared light signal emitted from the infrared
As shown in fig. 3, in some embodiments of the present application, the infrared
The
As shown in fig. 3, in some embodiments of the present disclosure, the
Alternatively, the
The
As shown in fig. 3, in some embodiments of the present application, the
The
It should be understood that the
As shown in fig. 3, in some embodiments of the present application, the
As shown in fig. 4, if the
In order to reduce the influence of Newton's ring to fingerprint detection effect, the embodiment of the application provides a fingerprint detection device, is applicable to the electronic equipment who has liquid crystal display LCD screen, the LCD screen includes backlight unit. Fingerprint detection device includes the fingerprint detection module, the fingerprint detection module is used for setting up backlight unit's below, the fingerprint detection module is used for receiving returning and passing via the finger that external light source sent light signal of backlight unit, light signal is used for acquireing the fingerprint information of finger.
The backlight module sequentially comprises a light guide plate, a reflecting film and a backlight plate from top to bottom, wherein the backlight plate is provided with a first opening above the fingerprint detection module, the first opening is used for transmitting an optical signal reflected by a finger to the fingerprint detection module, a first dielectric layer is arranged between the light guide plate and the reflecting film, and the first dielectric layer is used for increasing a gap between the light guide plate and the reflecting film above the first opening.
Through the light guide plate with set up between the reflectance coating first dielectric layer can increase and be located the top of first trompil the light guide plate with clearance between the reflectance coating, it is corresponding, can increase the light path difference of the light that takes place the reflection between the light guide plate lower surface with the reflectance coating upper surface, and then reduce the interval of newton's ring for the interference fringe interval of the fingerprint image that the fingerprint detection module detected reduces, and the quantity reduces or even disappears, and then promote fingerprint detection effect and fingerprint detection device's performance.
In other words, by increasing the gap between the light guide plate and the reflective film above the first opening, the formation condition of newton's rings can be broken to improve the fingerprint detection effect and the performance of the fingerprint detection device.
Fig. 5 to 21 are schematic block diagrams of an
As shown in fig. 5 to 21, the display screen of the
As shown in fig. 5-21, in some embodiments of the present application, the
As shown in fig. 5 to 21, in some embodiments of the present application, the
Through the center installation
As shown in fig. 5-21, in some embodiments of the present application, the
As shown in fig. 5 to 21, in some embodiments of the present application, an end region of the
An implementation of the first dielectric layer between the
As shown in fig. 5 or 6, in some embodiments of the present application, the lower surface of the
The first
As shown in fig. 5 or 6, in some embodiments of the present disclosure, the lower surface of the
In other words, the
The lower surface of the
As shown in fig. 5 to 11, in some embodiments of the present application, the upper surface of the
In other words, the upper surface of the
The upper surface of the
As shown in fig. 5 to 11, in some embodiments of the present application, the
Of course, alternatively, the first upper surface and the second upper surface may also form a step structure, which is not specifically limited in this application.
The upper surface between the first upper surface and the second upper surface of the
As shown in fig. 5 or 6, in some embodiments of the present application, the lower surface of the
For example, the thickness of each region of the
The lower surface of the
The thickness of each region of the
As shown in fig. 10 or 11, in some embodiments of the present application, the thickness of the
For example, the area of the
The thickness of the
As shown in fig. 12 to 18, in some embodiments of the present disclosure, a lower surface of the
In other words, a first
The
In addition, will the aperture design of
In some embodiments of the present application, the
In some embodiments of the present application, the
Will first
In some embodiments of the present application, the
In other words, the plurality of discrete dielectric layers may be disposed around the
Of course, the
The implementation of the
As shown in fig. 7, in some embodiments of the present application, the
Of course, the shape and position of the
A second dielectric layer between the
In some embodiments of the present disclosure, a second dielectric layer is disposed between the
In other words, the
The second dielectric layer is designed between the
As shown in fig. 5 or 6, in some embodiments of the present application, the lower surface of the
As shown in fig. 19 to 21, in some embodiments of the present disclosure, the
The third
As shown in fig. 19 or 20, in some embodiments of the present application, the thickness of the third
The thickness of the third
In some embodiments of the present application, the
Of course, the
The implementation of the
As shown in fig. 5 to 11 or fig. 19 to 21, in some embodiments of the present disclosure, a lower surface of the
Of course, the shape and position of the
In some embodiments of the present application, the
Of course, the
Similarly, the third
It should be noted that, in the embodiment of the present application, the backlight module may only be provided with the
In addition, this application embodiment still provides a backlight unit, is applicable to the electronic equipment who has liquid crystal display LCD screen, the LCD screen includes backlight unit.
The backlight module sequentially comprises a
In some embodiments of the present application, the lower surface of the
In some embodiments of the present application, the lower surface of the
In some embodiments of the present application, the
In some embodiments of the present application, the upper surface of the
In some embodiments of the present application, the
In some embodiments of the present application, the thickness of the
In some embodiments of the present application, the lower surface of the
In some embodiments of the present application, the thickness of each region of the
In some embodiments of the present application, the lower surface of the
In some embodiments of the present application, the
In some embodiments of the present application, the
In some embodiments of the present disclosure, a
In some embodiments of the present application, the lower surface of the
In some embodiments of the present application, the
In some embodiments of the present application, the thickness of the third
In some embodiments of the present application, the
In some embodiments of the present application, the lower surface of the
In some embodiments of the present application, the
In some embodiments of the present application, the center of electronic equipment is provided with the fourth trompil, the fourth trompil be used for with via the optical signal transmission who points the reflection extremely
In some embodiments of the present application, the
In addition, this application embodiment still provides a backlight unit, and in some embodiments of this application, be applicable to the electronic equipment who has liquid crystal display LCD screen, the LCD screen includes backlight unit. The backlight module sequentially comprises a
In some embodiments of the present application, the lower surface of the
In some embodiments of the present application, the
In some embodiments of the present application, the thickness of the third
In some embodiments of the present application, the
In some embodiments of the present disclosure, the lower surface of the
In some embodiments of the present application, the
In some embodiments of the present application, the center of electronic equipment is provided with the fourth trompil, the fourth trompil be used for with via the optical signal transmission who points the reflection extremely
In some embodiments of the present application, the
In addition, an embodiment of the present application further provides a display screen, where the display screen includes the backlight module (for example, the
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
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