阅读说明：本技术 背光模块及显示装置 (Backlight module and display device ) 是由 邱达翔 程伟烜 许怀忠 于 2019-03-11 设计创作，主要内容包括：本发明提供一种背光模块,包含导光板、光源、光学膜片组及至少一遮光层。导光板具有入光面及邻接于入光面的出光面；光源设置于入光面旁；光学膜片组包含第一表面、第二表面及至少一端面,第一表面及第二表面相对,至少一端面连接第一表面及第二表面,光学膜片组设置于导光板之出光面,且第一表面面向出光面；至少一遮光层设置于至少一端面。一种应用此背光模块的显示装置亦被提出,此显示装置之显示面板的可视区边缘不致有亮晕问题产生,且显示面板的整体画面更为均匀。(The invention provides a backlight module, which comprises a light guide plate, a light source, an optical film set and at least one shading layer. The light guide plate is provided with a light incident surface and a light emergent surface adjacent to the light incident surface; the light source is arranged beside the light incident surface; the optical diaphragm group comprises a first surface, a second surface and at least one end surface, wherein the first surface is opposite to the second surface, the at least one end surface is connected with the first surface and the second surface, the optical diaphragm group is arranged on the light-emitting surface of the light guide plate, and the first surface faces the light-emitting surface; the at least one shading layer is arranged on the at least one end face. A display device using the backlight module is also provided, the edge of the visible area of the display panel of the display device does not cause the problem of halo, and the whole picture of the display panel is more uniform.)

1. A backlight module comprises a light guide plate, a light source, an optical film set and at least one light shielding layer,

the light guide plate is provided with a light incident surface and a light emergent surface adjacent to the light incident surface;

the light source is arranged beside the light incident surface;

the optical diaphragm group comprises a first surface, a second surface and at least one end face, the first surface is opposite to the second surface, the at least one end face is connected with the first surface and the second surface, the optical diaphragm group is arranged on the light emitting surface of the light guide plate, and the first surface faces the light emitting surface;

the at least one shading layer is arranged on the at least one end face.

2. The backlight module of claim 1, wherein the at least one light-shielding layer comprises an ink layer or an adhesive tape layer.

3. The backlight module of claim 1, wherein the color of the at least one light-shielding layer comprises black or gray.

4. The backlight module of claim 1, wherein the light guide plate further comprises a bottom surface opposite to the light emitting surface, the light incident surface is connected to the bottom surface and the light emitting surface, and the bottom surface is provided with a plurality of microstructures.

5. The backlight module of claim 1, wherein the at least one end surface of the optical film group is a rough surface.

6. The backlight module of claim 1, wherein the number of the at least one end surface is four, and the end surfaces are a first end surface, a second end surface, a third end surface and a fourth end surface, the first end surface and the second end surface are opposite, the third end surface and the fourth end surface are opposite and adjacent to the first end surface and the second end surface, the first end surface faces the light source, wherein the number of the at least one light shielding layer is plural, and the at least one light shielding layer is disposed on any two, any three or all of the first end surface, the second end surface, the third end surface and the fourth end surface.

7. A display device comprises a backlight module and a display panel,

the backlight module comprises a light guide plate, a light source, an optical film set and at least one light shielding layer,

the light guide plate is provided with a light incident surface and a light emergent surface adjacent to the light incident surface;

the light source is arranged beside the light incident surface;

the optical diaphragm group comprises a first surface, a second surface and at least one end face, the first surface is opposite to the second surface, the at least one end face is connected with the first surface and the second surface, the optical diaphragm group is arranged on the light emitting surface of the light guide plate, and the first surface faces the light emitting surface;

the at least one shading layer is arranged on the at least one end face;

the display panel faces the second surface of the optical film group, wherein the optical film group is located between the display panel and the light guide plate.

8. The display device according to claim 7, wherein the display panel comprises a visible region and an inactive region surrounding the visible region, the inactive region having a width of less than 3 mm.

9. The display device as claimed in claim 8, wherein the at least one light shielding layer is located in an orthographic projection range of the inactive area on the light guide plate.

Technical Field

The present invention relates to a light source module and a display device, and more particularly, to a backlight module and a display device having the backlight module.

Background

With the rapid development of display devices (such as computer screens and mobile phone screens), a design level more attractive to consumers is particularly emphasized, wherein the appearance feature of the narrow bezel is one of the factors for enhancing the purchasing desire of consumers, and the display device with the narrow bezel is to enlarge the visible area of the display panel by reducing the left and right edges or the peripheral edge of the display panel.

In another general display device, a backlight module is mainly assembled from a display panel and the backlight module, the backlight module is used to provide backlight for the display panel, an optical film is usually used in the backlight module, and the optical film faces the display panel, so as to provide uniform planar light to the display panel through the optical film, however, a small portion of light is scattered out through an end edge of the optical film except for a large portion of light provided to the display panel through the optical film facing one side of the display panel, when the display panel is in a narrow frame structure, the light scattered out through the end edge of the optical film cannot be effectively shielded, and a halo problem is generated at an edge of a visible area picture.

The background section is provided to facilitate an understanding of the present disclosure, and thus the disclosure in the background section may include additional art that is not known to those skilled in the art. Furthermore, the disclosure in the "background" section is not intended to represent a representation of the disclosure or of the problems one or more embodiments of the present invention would solve, nor is it intended to be interpreted as being known or appreciated by those skilled in the art prior to the filing date of the present application.

Disclosure of Invention

The invention provides a backlight module and a display device, which are used for reducing the light leakage phenomenon of the backlight module caused by light scattering generated at the end edge of an optical film group of the backlight module so as to solve the halo problem of the edge of a visible area of a display panel.

Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention.

In order to achieve one or part or all of the above or other objects, the backlight module provided by the invention comprises a light guide plate, a light source, an optical film set and at least one light shielding layer. The light guide plate is provided with a light incident surface and a light emergent surface adjacent to the light incident surface; the light source is arranged beside the light incident surface; the optical diaphragm group comprises a first surface, a second surface and at least one end surface, wherein the first surface is opposite to the second surface, the at least one end surface is connected with the first surface and the second surface, the optical diaphragm group is arranged on the light-emitting surface of the light guide plate, and the first surface faces the light-emitting surface; the at least one shading layer is arranged on the at least one end face.

In order to achieve one or a part of or all of the above or other objects, the present invention provides a display device including a backlight module and a display panel. The backlight module comprises a light guide plate, a light source, an optical film set and at least one shading layer. The light guide plate is provided with a light incident surface and a light emergent surface adjacent to the light incident surface; the light source is arranged beside the light incident surface; the optical diaphragm group comprises a first surface, a second surface and at least one end surface, wherein the first surface is opposite to the second surface, the at least one end surface is connected with the first surface and the second surface, the optical diaphragm group is arranged on the light-emitting surface of the light guide plate, and the first surface faces the light-emitting surface; the at least one shading layer is arranged on the at least one end face. The display panel faces the second surface of the optical film group, wherein the optical film group is positioned between the display panel and the light guide plate.

The black or gray shading layer is arranged on the end face of the optical film group of the backlight module, so that the light scattering phenomenon generated on the end face of the optical film group can be improved, when a display panel of the display device is of a narrow frame structure, the problem that light rays are scattered from the end face of the optical film group to cause bright halo on the edge of a visible area is avoided, and the whole picture of the display panel is more uniform.

In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic perspective exploded view of a display device according to an embodiment of the invention

Fig. 2 is a schematic structural diagram of a display device according to an embodiment of the invention.

FIG. 3 is a partial cross-sectional view of the line A-A of the display device of FIG. 2.

FIG. 4 is a partial cross-sectional view of the display device of FIG. 2 along line B-B.

List of reference numerals

10: display module

12: backlight module

14: display panel

141: visual area

142: null area

16: light guide plate

161: light incident surface

162: light emitting surface

163: bottom surface

18: light source

19: circuit board

20: optical film group

201: first surface

202: second surface

203 a: first end face

203 b: second end face

203 c: third end face

203 d: fourth end face

22: light shielding layer

24: back plate

26: reflector plate

28: rubber frame

A-A: line segment

B-B: line segment

L, L1: a light beam.

Detailed Description

The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of preferred embodiments, which proceeds with reference to the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1 is an exploded perspective view of a display device according to an embodiment of the invention, fig. 2 is a structural view of the display device according to the embodiment of the invention, fig. 3 is a partial cross-sectional view of a line a-a of the display device of fig. 2, and fig. 4 is a partial cross-sectional view of a line B-B of the display device of fig. 2. As shown in fig. 1 to 4, the display device 10 includes a backlight module 12 and a display panel 14 disposed corresponding to the backlight module 12, wherein the backlight module 12 is used for providing backlight for the display panel 14. In one embodiment, the display panel 14 is, for example, a liquid crystal display panel, but is not limited thereto.

The backlight module 12 includes a light guide plate 16, a light source 18, an optical film set 20 and a light shielding layer 22. As shown in fig. 3 and 4, the light guide plate 16 has a light incident surface 161, a light emitting surface 162 and a bottom surface 163, the light emitting surface 162 is opposite to the bottom surface 163, the light incident surface 161 is connected to the bottom surface 163 and the light emitting surface 162, and in an embodiment, the bottom surface 163 of the light guide plate 16 is provided with a plurality of microstructures (not shown). The light source 18 is disposed beside the light incident surface 161, and the light source 18 may be a light emitting diode or other light emitting device, as shown in fig. 3, the light source 18 is configured to provide a light beam L, and in an embodiment, the light beam L enters the light guide plate 16 through the light incident surface 161, is guided to the light emitting surface 162 through the microstructures of the bottom surface 163, and is emitted from the light emitting surface 162.

Continuing with the above description, the optical film set 20 includes a first surface 201 (shown in fig. 3 and 4), a second surface 202, and end faces, and in an embodiment, the optical film set includes four end faces, which are a first end face 203a, a second end face 203b, a third end face 203c, and a fourth end face 203d, respectively, as shown in fig. 1. As shown in fig. 3 and 4, the first surface 201 and the second surface 202 are opposite, the first end surface 203a (shown in fig. 3), the second end surface 203b, the third end surface 203c (shown in fig. 4) and the fourth end surface 203d connect the first surface 201 and the second surface 202, the first end surface 203a and the second end surface 203b are opposite, and the third end surface 203c and the fourth end surface 203d are opposite and adjacent to the first end surface 203a and the second end surface 203 b; the optical film set 20 is disposed on the light-emitting surface 162 of the light guide plate 16, wherein the first surface 201 faces the light-emitting surface 162, and the first end surface 203a faces the light source 18. The number of the light-shielding layers 22 may be one or more, and the light-shielding layers are respectively disposed on any one, any two, any three, or all of the first end surface 203a, the second end surface 203b, the third end surface 203c, and the fourth end surface 203 d. In one embodiment, the light-shielding layer 22 may include an ink layer or an adhesive tape layer, and the color of the light-shielding layer 22 may include black or gray.

In one embodiment, the optical film set 20 may include a plurality of optical films, which are stacked in sequence, wherein the first surface 201 of the optical film set 20 is, for example, the bottom surface of the lowermost optical film, and the second surface 202 of the optical film set 20 is, for example, the top surface of the uppermost optical film; the optical film may be, but not limited to, a diffusion sheet, a prism sheet, etc., and the optical film set 20 is, for example, a stacked combination of one or more diffusion sheets and one or more prism sheets. In another embodiment, the optical film set 20 may be only a single optical film, and the first surface 201 and the second surface 202 are, for example, a bottom surface and a top surface of the single optical film, respectively. When the optical film group 20 is cut, the first end surface 203a, the second end surface 203b, the third end surface 203c, and the fourth end surface 203d are not flat or smooth, so that most of the first end surface 203a, the second end surface 202b, the third end surface 203c, and the fourth end surface 203d are rough surfaces. In an embodiment, as shown in fig. 1, 3 and 4, the light shielding layer 22 is disposed on the first end surface 203a, the third end surface 203c and the fourth end surface 203d, but not limited thereto, the light shielding layer 22 may be disposed on any one, any two, any three or all of the first end surface 203a, the second end surface 203b, the third end surface 203c and the fourth end surface 203d as required.

As described above, the light beam L emitted from the light source 18 is guided to the light-emitting surface 162 of the light guide plate 16 and emitted as a planar light to the optical film set 20, and after the optical film set 20 performs optical processing such as homogenization and atomization on the planar light emitted from the light guide plate 16, most of the planar light is emitted from the second surface 202 of the optical film set 20 to provide a uniform planar light for the display panel 14, wherein a small portion of the light beam L1 is transmitted to the first end surface 203a, the second end surface 203b, the third end surface 203c and/or the fourth end surface 203d of the optical film set 20, and a light scattering phenomenon is generated due to the rough surface, and at this time, by the arrangement of the light shielding layer 22, the light scattering can be effectively absorbed or blocked, so as to improve the light scattering phenomenon of the first end surface 203a, the second end surface 203b, the third end surface 203c and/or the fourth end surface 203d of the optical film set 20.

As shown in fig. 1 to 4, the backlight module 12 further includes a circuit board 19, a back plate 24, a reflective sheet 26 and a plastic frame 28. The Circuit board 19 is, for example, a Flexible Printed Circuit (FPC), and is disposed on the light-emitting surface 162 of the light guide plate 16, and the Circuit board 19 is electrically connected to the light source 18. The light guide plate 16 is disposed on the back plate 24; the reflective sheet 26 is disposed between the back plate 24 and the bottom surface 163 of the light guide plate 16; the rubber frame 28 is assembled on the back plate 24 for accommodating and fixing the light guide plate 16 and the optical film set 20. In an embodiment, not shown, the frame 28 is used to hold the display panel 14.

Referring to fig. 3 and 4, the display panel 14 is disposed corresponding to the backlight module 12, wherein the display panel 14 faces the second surface 202 of the optical film set 20 of the backlight module 12, that is, the optical film set 20 is located between the display panel 14 and the light guide plate 16. In an embodiment, the display panel 14 includes a visible area 141 and an invalid area 142, and the invalid area 142 surrounds the visible area 141, wherein the invalid area 142 represents an area of the display panel 14 where a picture cannot be displayed, for example, in a display device 10 with a narrow frame, the width of the invalid area 142 is less than 3 mm. In one embodiment, the light shielding layer 22 is located in the orthographic projection range of the ineffective area 142 on the light guide plate 16.

In the invention, the light shielding layer is arranged on the end face of the optical film group of the backlight module, so that the light scattering phenomenon generated on the end face of the optical film group can be improved, when the display panel of the display device is in a narrow frame structure, the problem that light rays are scattered from the end face of the optical film group to cause bright halo at the edge of a visible area (namely, at the junction of the visible area and an invalid area) is avoided, and the whole picture of the display panel is more uniform. In addition, the color of the light shielding layer can be black or gray, wherein the light shielding effect can be finely adjusted according to the actual edge brightness of the visible area by selecting the color of the light shielding layer from black, dark gray or light gray, thereby further conforming to the optical grade of each display device user.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, which is defined by the appended claims and the description of the invention, and all simple equivalent changes and modifications are intended to be covered by the present invention. Moreover, not all objects, advantages, or features disclosed herein are to be achieved in any one embodiment or claim of the present invention. In addition, the abstract and the title of the specification are provided for assisting the search of patent documents and are not intended to limit the scope of the invention. Furthermore, the terms "first," "second," and the like in the description and in the claims are used for naming elements (elements) or distinguishing between different embodiments or ranges, and are not intended to limit the upper or lower limit on the number of elements.