阅读说明：本技术 增亮膜及显示装置 (Brightness enhancement film and display device ) 是由 罗飞 于 2021-06-30 设计创作，主要内容包括：本公开提供了一种增亮膜及显示装置。增亮膜包括基材和位于基材上的微结构层,微结构层包括多个间隔设置的第一高度棱镜和多个独立设置的第二高度棱镜,各个第一高度棱镜和各个第二高度棱镜均呈规则的图案排布,各个第二高度棱镜的高度为h-2,各个第一高度棱镜的高度为h-1,h-1大于h-2。采用该增亮膜的显示装置,可以更加精确控制出光,减少了光线漏出,减少了显示的图像边缘区域的模糊,提高了采用上述增亮膜的显示装置的对比度。(The disclosure provides a brightness enhancement film and a display device. The brightness enhancement film comprises a substrate and a microstructure layer positioned on the substrate, the microstructure layer comprises a plurality of first height prisms arranged at intervals and a plurality of independently arranged second height prisms, each first height prism and each second height prism are arranged in regular patterns, and the height of each second height prism is h 2 Each of the first height prisms has a height h 1 ，h 1 Greater than h 2 . The display device adopting the brightness enhancement film can more accurately control light emission, reduces light leakage, reduces the blur of the edge area of a displayed image, and improves the contrast of the display device adopting the brightness enhancement film.)

1. The brightness enhancement film is characterized by comprising a substrate and a microstructure layer positioned on the substrate, wherein the microstructure layer comprises a plurality of first-height prisms arranged at intervals and a plurality of second-height prisms arranged independently, the first-height prisms and the second-height prisms are arranged in regular patterns, and the heights of the second-height prisms are h₂Each of the first height prisms has a height h₁，h₁Greater than h₂。

2. The brightness enhancing film of claim 1, wherein h is₁Less than 2h₂Preferably, h₁Less than 1.5h₂。

3. The brightness enhancing film according to claim 1, wherein the substrate has a thickness h₀The transverse width of the first height prism is d₁The transverse width of the second height prism is d₂The transverse distance between two adjacent first height prisms is greater than or equal to

4. According to claimThe brightness enhancement film according to claim 3, wherein d is₁＝d₂。

5. The brightness enhancing film according to claim 1, wherein the substrate comprises one or more layers.

6. The brightness enhancing film according to claim 1, wherein the material of the microstructure layer is PMMA.

7. The brightness enhancing film according to claim 1, wherein the substrate comprises quantum dots.

8. A display device comprising a plurality of zone controlled backlight sources, a brightness enhancement film, and a display layer comprising a plurality of pixel spot arrays, the brightness enhancement film being any one of the brightness enhancement films of claims 1-7.

9. The display device according to claim 8, wherein the display device is a direct-type display device or a side-type display device.

10. A display device comprising a plurality of zone controlled backlight sources, and further comprising optics for secondary zoning light emitted from said zone controlled backlight sources to form a plurality of secondary zoned backlights during operation of said display device, said secondary zones having a higher density than the density of the initial zones of said backlight sources.

Technical Field

The disclosure relates to the field of backlight display, in particular to a brightness enhancement film and a display device.

Background

The liquid crystal display is limited by the pixel light leakage phenomenon, and compared with a novel display technology, the contrast ratio is a short plate, so that a subarea backlight method is gradually developed for the liquid crystal display technology, a backlight light source LED array is regulated and controlled in a subarea mode, backlight with different brightness is respectively regulated and controlled in a high gray level area and a low gray level area, the pixel light leakage phenomenon can be improved to a certain extent, and the display contrast ratio is improved. However, the display effect of the backlight source partition regulation and control technology is positively correlated with the number of partitions, the more partitions are, the more difficult the realization technology is, and the higher the cost is, and therefore, a more efficient solution is needed at present.

Disclosure of Invention

The disclosure provides a brightness enhancement film and a display device, which can effectively reduce the light leakage phenomenon of a liquid crystal display pixel.

For this purpose use is made ofAccording to a first aspect of the present disclosure, a brightness enhancement film is provided, which includes a substrate and a microstructure layer on the substrate, wherein the microstructure layer includes a plurality of first height prisms and a plurality of second height prisms arranged independently at intervals, each of the first height prisms and each of the second height prisms are arranged in a regular pattern, and the height of each of the second height prisms is h₂Each of the first height prisms has a height h₁，h₁Greater than h₂。

Further, h₁Less than 2h₂Preferably, h₁Less than 1.5h₂。

Further, the thickness of the base material is h₀The first height prism has a lateral width d₁The second height prism has a lateral width d₂The transverse distance between two adjacent prisms with the first height is greater than or equal to

Further, d₁＝d₂。

Further, the substrate comprises one or more layers.

Further, the material of the microstructure layer is PMMA.

Further, the substrate includes quantum dots therein.

According to a second aspect of the present disclosure, there is provided a display device comprising a plurality of zone-controlled backlight sources, a brightness enhancement film, and a display layer comprising a plurality of pixel dot arrays, the brightness enhancement film being any of the brightness enhancement films described above.

Further, the display device is a direct type display device or a side type display device.

Further, the display device comprises a plurality of zone-controlled backlight light sources and an optical device, wherein the optical device can perform secondary zone division on light emitted by the zone-controlled backlight light sources so as to form a plurality of secondary zone backlights when the display device is in operation, and the density of the secondary zones is higher than that of the initial zones of the backlight light sources.

By applying the technical scheme, the prism structure can realize the emergent light rays which are nearly vertical or vertical to the surface of the brightness enhancement film, and the height of the prism with the second height is higher than that of the prism with the first height, so that the diffuse reflective blocking of the light rays can be realized, and the further partition of the backlight is realized, or the secondary partition is realized. Therefore, light emission is controlled more accurately, light leakage is reduced, blurring of the edge area of a displayed image is reduced, and the contrast of a display device adopting the brightness enhancement film is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the disclosure and, together with the description, serve to explain the disclosure and not to limit the disclosure. In the drawings:

fig. 1 shows a schematic cross-sectional structure and a schematic display effect of a direct type display device in the prior art.

Fig. 2 is a schematic diagram showing a cross-sectional structure and a display effect of a direct type display device in another prior art.

Fig. 3 is a schematic cross-sectional view illustrating a direct type display device according to an embodiment of the invention.

Fig. 4 is a schematic diagram illustrating a dimensional structure of a brightness enhancement film according to an embodiment.

Fig. 5 is a view showing a scale of the division size of the backlight light source of embodiment 1.

Fig. 6a shows a schematic cross-sectional structure of the brightness enhancement film of example 1.

Fig. 6b shows a schematic of a cross-sectional structure of a partially cut brightness enhancement film of example 1.

Fig. 6c shows a schematic side view of the three-dimensional structure of the brightness enhancement film of example 1.

Fig. 6d shows a schematic side view of the three-dimensional structure of the partially cut brightness enhancement film of example 1.

Fig. 7 shows a display screen simulation result of the display device of embodiment 1.

Fig. 8 shows the display screen simulation result of the display device of comparative example 1.

Fig. 9 shows the display screen simulation result of the display device of comparative example 2.

Reference numerals: 1. a display layer; 2A, a traditional brightness enhancement film; 2B, a brightness enhancement film; 3A, a non-partitioned backlight source; 3B, partitioning backlight light sources; z1, light leakage area; z2, image display area set.

Description of abbreviations: BL is a backlight source.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terms "first," "second," and the like in the description and in the claims of the present disclosure are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure may be described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments of the solutions provided according to the present disclosure will be described in more detail below. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art.

In the prior art lcd device, the conventional optical plate is made of a whole piece of acrylic or other optical plastic material. As shown in fig. 1, if the backlight source partition control is not used, the light leakage is serious, and thus, the pixels which do not need to be displayed also have light, and the image edge is blurred. As shown in fig. 2, if the backlight light sources are used to control the on/off and brightness of the backlight light sources in different regions, since the optical path transmission can be performed inside the optical plate, except for the set image display region, the display layer directly above the backlight light sources BL1 and BL4 receives light from the backlight light sources BL2 and BL3 (see arrow direction, which refers to light direction), which improves the display effect of fig. 1, but still causes a light leakage phenomenon of some pixels, which causes the edge of the image to be displayed to be blurred, and reduces the contrast.

In a first aspect of the present disclosure, a brightness enhancement film is provided, which includes a substrate and a microstructure layer on the substrate, the microstructure layer includes a plurality of first height prisms and a plurality of second height prisms, the first height prisms and the second height prisms are arranged in regular patterns, and the height of each second height prism is h₂Each of the first height prisms has a height h₁，h₁Greater than h₂. Fig. 3 is a schematic configuration diagram of a display device, and as can be seen from comparison between the display effects of fig. 3 and fig. 2, the image display region set by Z2 should be a white region, the region other than the region Z2 is a non-display region, and if Z1 is not pure black, light leakage is evidenced, but the black color of the Z1 light leakage region in fig. 3 is darker than the black color of the Z1 light leakage region in fig. 2, meaning that light leakage is reduced, i.e., blurring of the edge region of the displayed image is reduced. The prism structure can realize that light rays are approximately vertical or vertical to the surface of the brightness enhancement film for emergent, and the height of the second height prism is higher than that of the first height prism, so that the diffuse reflective blocking of the light rays can be realized, and the further partition of backlight is realized, or secondary partition is realized.

In some embodiments, the surface of the first height prisms is provided with a reflective material having a reflectivity of no less than 50%, preferably no less than 80%. The disposing method may be coating. The reflective blocking effect of the reflective material is stronger than that of the first height prism, and the zoning effect is more remarkable.

In some embodiments, the regular pattern arrangement includes, but is not limited to, the first height prisms arranged in a row a times a column b, and the second height prisms arranged in a row c times a column d, and the number of columns in each row can be adjusted. The regular pattern arrangement may also be a combination of other regularly repeating patterns.

In some embodiments, the bases between any adjacent prisms are connected in contact with each other, i.e., the spacing between any two adjacent prisms is equal to 0.

In some embodiments, the cross-section of each prism is triangular. Each prism is a triangular pyramid. The top of the trigonal pyramid can have a certain radian and is not sharp. In some embodiments, the cross-section of each prism is approximately semi-circular in shape. In some embodiments, the first height prisms and the second height prisms may be made of different materials. In some embodiments, there may be a third height prism, the third height prism being different from the second height prism, and the third height prism having a height less than the first height prism. In some embodiments, prisms of more heights may also be included.

In some embodiments, h₁Less than 2h₂Preferably, h₁Less than 1.5h₂. The height affects the light blocking effect of the first height prism. In some embodiments, 3-5 prisms of the second height are disposed in the space between two adjacent prisms of the first height.

In some embodiments, the substrate has a thickness h₀The first height prism has a lateral width d₁The second height prism has a lateral width d₂The transverse distance between two adjacent prisms with the first height is greater than or equal toAs shown in fig. 4, the critical condition for blocking light is that segment AB/AC is BD/CE, and the above calculation result is derived.

In some embodiments, d₁＝d₂. Thereby facilitating the preparation of the microstructure layer.

In some embodiments, h₂In the range of 25 to 55 μm. In some embodiments, the micro-junctionsOther functional layers, such as tie layers, are also present between the layer and the substrate. In some embodiments, the material of the substrate is PET.

In some embodiments, the substrate comprises one or more layers.

In some embodiments, the material of the microstructure layer is PMMA (polymethyl methacrylate), also referred to as a conventional brightness enhancing film material. In some embodiments, the first height prisms and the second height prisms are different materials.

In some embodiments, the substrate comprises quantum dots. One or more layers of the substrate comprise quantum dots to realize the function of light conversion. In some embodiments, the substrate includes diffusion particles therein. One or more layers of the base material contain diffusion particles to realize the function of light diffusion.

In some embodiments, the backlight light sources are LEDs.

In a second aspect of the disclosure, a display device is provided, which includes a plurality of backlight sources controlled by zones, a brightness enhancement film, and a display layer including a plurality of pixel dot arrays, wherein the brightness enhancement film is any one of the brightness enhancement films described above. The display device with the brightness enhancement film has higher contrast.

In some embodiments, the display device is a direct-lit display device or a side-lit display device. Reference may be made to the prior art how to implement partition control.

In a third aspect of the present disclosure, there is provided a display device comprising a plurality of zone-controlled backlight light sources, and further comprising an optical device for secondarily partitioning light emitted from the zone-controlled backlight light sources to form a plurality of secondarily partitioned backlights when the display device is in operation, wherein the density of the secondary partitions is higher than that of the primary partitions of the backlight light sources. By further partitioning the backlight, smaller partitions are formed, thereby improving the contrast ratio.

In some embodiments, the optical device can be any one of the brightness enhancement films described above. In some embodiments, the optical device is a diffuser plate, a diffuser film, or a light guide plate.

The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.

Example 1

Direct type display device

Through optical software simulation: the display area is selected to be 80mm x 50 mm. The display image was set to a hollow pattern as in fig. 7, and the display transmittance (or the "light leakage rate") was set to 10%.

As shown in fig. 5, the backlight source of 80mm × 50mm is divided into 16 rectangular backlight partitions of 19.99mm × 12.49mm, and for software simulation, the backlight partition interval is set to 0.02mm (the line width of the dividing line is determined in software), and the backlight source is set to a uniform light-emitting field type.

As shown in fig. 6a, 6b, 6c, and 6d, a brightness enhancement film of 80mm × 50mm is provided, the PET substrate is PMMA, the substrate thickness is 125 μm, the height of the second height prisms is 25 μm, the cross section is a right triangle with a right angle vertex angle, the lateral width is 50 μm, the height of the first height prisms is 62.5 μm, the cross section is a triangle, the lateral width is 50 μm, the second height prisms and the first height prisms are arranged in a horizontal and vertical array, and four second height prisms are arranged between every two first height prisms. The simulation results are shown in FIG. 7, in which the unit of abscissa and ordinate is the dimension (mm), and the same applies below.

Comparative example 1

Direct type display device

The difference from example 1 is that there is no backlight source partition and no special brightness enhancement film. A brightness enhancement film having the same size and base material as example 1, a base material thickness of 125 μm, a prism height of 25 μm, a cross section of a right-angled triangle having a right angle apex, a lateral width of 50 μm, and prisms uniformly arranged therebetween. The simulation results are shown in fig. 8.

Comparative example 2

Direct type display device

The difference from example 1 is that there is no special brightness enhancement film. The brightness enhancement film used was the same as in comparative example 1. The simulation results are shown in fig. 9.

It should be noted that, because the resolution of the software and the display is limited, the applicant can increase the brightness of the picture of the simulation result by 10% at the same time to obtain fig. 7 to 9, which is convenient for viewing the difference of the simulation result. As seen in fig. 7 to 9, the display device of fig. 7 has the best display effect, and almost no gray scale other than text exists. Fig. 9 times, there is a certain gray level; at the very least in fig. 8, there is a large range of gray levels. Therefore, the technical solution of embodiment 1 can reduce light leakage and has the effect of improving contrast.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.