Display device

Abstract

The application relates to a display device, which comprises a plurality of display units arranged in splicing, the display unit comprising a backlight module and a display panel, the light-emitting device layer of the backlight module comprising a first light-emitting device and a second light-emitting device, the second light-emitting device being located between the first light-emitting device and the splicing joint and being arranged adjacent to the splicing joint, wherein a light guide layer is arranged between the backlight modules of the adjacent display units, the light guide layer being located above the light-emitting device layer and covering at least the splicing joint, the side of the light guide layer close to the substrate being provided with a first microstructure and a second microstructure, and the first microstructure and the second microstructure being located on the opposite sides of the splicing joint; the application guides part of the light emitted by the second light-emitting device to the display area of the display unit adjacent to the second light-emitting device through the light guide layer, so that the brightness of part of the display area close to the two sides of the splicing joint is compensated, and the uniformity of the overall brightness of the display device is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display device. Background Technology

[0002] A splicing display device is usually composed of multiple displays spliced ​​together, which will create seams between the displays. Due to factors such as the edge structure of the displays, backlight performance, splicing process, bending or folding function, some areas near the seams in the splicing display device are prone to uneven brightness or light leakage, resulting in poor overall light uniformity of the splicing display device and affecting the display effect. Summary of the Invention

[0003] This application provides a display device that can effectively improve the light emission uniformity and display effect of a splicing display device.

[0004] This application provides a display device, including a plurality of display units spliced ​​together, with a seam between adjacent display units, and each display unit includes a backlight module and a display panel disposed on the light-emitting side of the backlight module;

[0005] The backlight module includes:

[0006] substrate;

[0007] A light-emitting device layer is disposed on the side of the substrate close to the display panel. The light-emitting device layer includes a first light-emitting device and a second light-emitting device. The second light-emitting device is located between the first light-emitting device and the seam, and the second light-emitting device is disposed adjacent to the seam.

[0008] A light guide layer is provided between the backlight modules of adjacent display units. The light guide layer is located above the light-emitting device layer and at least covers the seam. A first microstructure and a second microstructure are provided on the side of the light guide layer near the substrate. The first microstructure and the second microstructure are located on opposite sides of the seam.

[0009] In some embodiments, the first microstructure and the second microstructure are located at opposite ends of the light guide layer near the substrate, and the first microstructure and the second microstructure are symmetrically arranged about the seam.

[0010] In some embodiments, the light guide layer includes a bendable region and a first non-bendable region and a second non-bendable region located on opposite sides of the bendable region, wherein the first microstructure is located in the first non-bendable region and the second microstructure is located in the second non-bendable region;

[0011] A third microstructure is provided on the side of the light guide layer away from the substrate, and the third microstructure is located in the bendable region.

[0012] In some embodiments, the third microstructure includes a plurality of first openings arranged along a first direction, the first direction being the direction from the display unit to the seam;

[0013] When the light guide layer is in a flattened state, the width of the first opening decreases along the second direction;

[0014] When the light guide layer is in a bent state, the width of the first opening increases along the second direction, which is the direction from the substrate to the display panel.

[0015] In some embodiments, the backlight module further includes:

[0016] A semi-transparent, semi-reflective layer is disposed on the light-emitting side of the second light-emitting device; and

[0017] A reflective structure is disposed at least on the periphery of the second light-emitting device, and the surface of the reflective structure near the semi-transparent and semi-reflective layer is inclined toward the substrate in the direction from the display unit to the seam.

[0018] In some embodiments, in the top view of the display device, the orthographic projection of the semi-transparent and semi-reflective layer at least covers the orthographic projection of the second light-emitting device and the orthographic projection of the reflective structure.

[0019] In some embodiments, the reflective structure is a wedge-shaped structure, the second light-emitting device is embedded in the wedge-shaped structure, and the reflective structure exposes the light-emitting surface of the second light-emitting device.

[0020] In some embodiments, the backlight module further includes:

[0021] A reflective layer is disposed on the side of the substrate near the light-emitting device layer;

[0022] The reflective structure is disposed on the reflective layer, or the reflective structure is embedded in the reflective layer.

[0023] In some embodiments, the backlight module further includes:

[0024] A light-diffusing layer is disposed on the side of the display panel near the light-emitting device layer, wherein the light guide layer is located between the light-diffusing layers of two adjacent display units;

[0025] A brightness enhancement layer is disposed between the display panel and the light uniform layer.

[0026] In some embodiments, during the bending process of the display device, some of the light emitted by the second light-emitting device is discharged from the seam.

[0027] There is an angle θ between adjacent display units. As the angle θ increases, the brightness at the seam increases or decreases. The angle θ ranges from 0° to 180°.

[0028] This application provides a display device. The display device comprises a light guide layer disposed between two interconnected backlight modules. This light guide layer is located above the light-emitting device layer and at least covers the seam. A first microstructure and a second microstructure are disposed on the side of the light guide layer closest to the substrate, with the first and second microstructures spaced apart on opposite sides of the seam. The light guide layer between adjacent backlight modules allows some light emitted from the second light-emitting devices located on both sides of the seam to be incident on the first or second microstructure and undergo total internal reflection within the light guide layer. This guides some of the light emitted from the second light-emitting devices to the display area of ​​the adjacent display unit. In other words, the light guide layer cross-guides some of the light emitted from the second light-emitting devices on both sides of the seam to the display areas on opposite sides of the seam, thereby achieving brightness compensation for the display areas near the seam and achieving overall brightness uniformity of the display device, thus improving the display effect. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0031] Figure 1 This is a cross-sectional schematic diagram of a display device provided in an embodiment of this application;

[0032] Figure 2 This is a top view schematic diagram of a display device provided in an embodiment of this application;

[0033] Figure 3 This is a partial optical path schematic diagram of a display device provided in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the bending state of the light guide layer of a display device provided in an embodiment of this application;

[0035] Figure 5a This is a schematic diagram of a display device in a fully closed state according to an embodiment of this application;

[0036] Figure 5bThis is a schematic diagram of a display device in a semi-open state provided in an embodiment of this application;

[0037] Figure 5c This is a schematic diagram of a display device in its fully open / closed state according to an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 10. Display device; 100. Display unit; 101. First display unit; 102. Second display unit; 110. Seam; 111. Transparent connecting layer; 120. Display panel; 200. Backlight module; 201. First light beam; 202. Second light beam; 210. Substrate; 220. Light-emitting device layer; 221. First light-emitting device; 222, 222a, 222b. Second light-emitting device; 230. Light guide layer; 231. First microstructure; 232. Second microstructure; 233. Third microstructure; 234. First opening; 235. Second opening; 236. First surface; 240. Semi-transparent and semi-reflective layer; 241. Inclined surface; 250. Reflective structure; 260. Reflective layer; 270. Light-diffusing layer; 280. Brightness enhancement layer; 290. Color conversion layer; 300. Housing;

[0040] AA, display area; NA, non-display area; NC, bendable area; ND1, first non-bendable area; ND2, second non-bendable area. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0042] This application provides a display device 10, please refer to... Figures 1-3The display device 10 includes a plurality of display units 100 arranged in a spliced ​​manner, with a seam 110 between adjacent display units 100. Each display unit 100 includes a backlight module 200 and a display panel 120 disposed on the light-emitting side of the backlight module 200. The backlight module 200 includes a substrate 210 and a light-emitting device layer 220. The light-emitting device layer 220 is disposed on the side of the substrate 210 near the display panel 120. The light-emitting device layer 220 includes a first light-emitting device 221 and a second light-emitting device 222. The second light-emitting device 222 is located between the first light-emitting device 221 and the seam 110 and is disposed adjacent to the seam 110. A light guide layer 230 is disposed between the backlight modules 200 of adjacent display units 100. The light guide layer 230 is located between the light-emitting device layer 220 and the display panel 120 and at least covers the seam 110. A first microstructure 231 and a second microstructure 232 are disposed on the side of the light guide layer 230 near the substrate 210. The first microstructure 231 and the second microstructure 232 are located on opposite sides of the seam 110.

[0043] The display device 10 can be formed by splicing together multiple display units 100. The number of display units 100 is not limited, for example, 2, 3, or 4, but is not limited thereto. Please refer to... Figures 1-2 The following example uses a display device 10 comprising two display units 100, with the edges of the two display units 100 spliced ​​together to form a seam 110 at the splicing point. Each display unit 100 includes a display area AA, which is the area for displaying images. The seam 110 is located between the display areas AA of adjacent display units 100. The display device 10 may also include a non-display area NA, which is the border or other area of ​​the corresponding display unit 100, located between the display area AA and the seam 110. No images are displayed in the non-display area NA or at the seam 110.

[0044] The display panel 120 may be a liquid crystal display (LCD) panel. The display panel 120 includes an array substrate and a color filter substrate disposed opposite to each other, a liquid crystal layer located between the array substrate and the color filter substrate, a frame adhesive surrounding the liquid crystal layer, and a frame disposed around the array substrate and the color filter substrate. The display panel 120 may also include other film layer structures known in the art for use in liquid crystal display panel structures, such as polarizers, optical films, etc., but is not limited thereto.

[0045] The backlight module 200 includes a substrate 210, which includes a driving circuit. The driving circuit drives the light-emitting device above it to emit light, so as to provide a backlight for the display panel 120 and realize the image display function.

[0046] The light-emitting device layer 220 may include a plurality of first light-emitting devices 221 arranged in an array, and a plurality of second light-emitting devices 222; the light-emitting device layer 220 may include one or more columns of second light-emitting devices 222, wherein the column refers to the extension direction Y of the seam 110, and each column may include a plurality of second light-emitting devices 222, wherein the second light-emitting devices 222 are disposed close to the seam 110. Specifically, the first light-emitting devices 221 and the second light-emitting devices 222 may be LEDs, Mini LEDs, or Micro LEDs, etc., and the second light-emitting devices 222 may be the same as or different from the first light-emitting devices 221.

[0047] In the prior art, the second light-emitting device near the splicing seam is located at the edge of the display unit. Due to the edge structure of the display panel, such as frame obstruction, edge pixel driving differences, edge light guiding limitations, as well as the influence of edge light guiding caused by the splicing process and the influence of the spacing between edge light-emitting devices, there are problems such as uneven brightness in the display area near the splicing seam in the splicing display device.

[0048] To address the aforementioned issues, this application provides a light guide layer 230 between the backlight modules 200 of adjacent display units 100. The light guide layer 230 is located between the light-emitting device layer 220 and the display panel 120, and at least covers the seam 110. The light guide layer 230 has a first microstructure 231 and a second microstructure 232 on the side closest to the substrate 210. The first microstructure 231 and the second microstructure 232 serve as dots to change the angle of incident or emitted light. The first microstructure 231 and the second microstructure 232 are spaced apart and located on opposite sides of the seam 110. The first microstructure 231 and the second microstructure 232 are respectively positioned opposite to the second microstructure 231 on opposite sides of the seam 110. The light-emitting device 222 corresponds to the light emitted from the second light-emitting device 222 located on both sides of the seam 110. Part of the light emitted from the second light-emitting device 222 is incident on the first microstructure 231 or the second microstructure 232 and undergoes total internal reflection in the light guide layer 230. This guides part of the light emitted from the second light-emitting device 222 to the display area AA of the adjacent display unit 100. In other words, the light guide layer 230 cross-guides part of the light emitted from the second light-emitting device 222 on both sides of the seam 110 to the display areas AA on opposite sides of the seam 110. This achieves brightness compensation for the display areas AA near both sides of the seam 110, thereby achieving uniformity of the overall brightness of the display device 10 and improving the display effect.

[0049] For details, please refer to Figures 1-3The display device 10 includes a first display unit 101 and a second display unit 102 connected together. The first display unit 101 includes a second light-emitting device 222a, and the second display unit 102 includes a second light-emitting device 222b. The second light-emitting devices 222a and 222b are located on opposite sides of the seam 110 in a first direction X, and the first direction X is perpendicular to the extension direction Y of the seam 110. The light guide layer 230 includes a first microstructure 231 and a second microstructure 232. The first microstructure 231 and the second microstructure 232 are located at opposite ends of the light guide layer 230 near the substrate 210, wherein the first microstructure 231 is disposed near the second light-emitting device 222a, and the second microstructure 232 is disposed near the second light-emitting device 222b. The orthographic projection of the light guide layer 230 is located between the orthographic projections of two adjacent rows of second light-emitting devices 222, that is, between the second light-emitting devices 222a and 222b. The orthographic projection of the light guide layer 230 covers the seam 110 and at least part of the non-display area NA, or the orthographic projection of the light guide layer 230 may also cover the seam 110, the non-display area NA, and at least part of the display area AA (referring to the display area AA between the second light-emitting device 222 and the seam 110). The orthographic projection referred to in this application is the orthographic projection in the top view direction of the display device 10.

[0050] Please refer to Figure 3The first light ray 201 emitted by the second light-emitting device 222a strikes the surface of the first microstructure 231. The first microstructure 231 can increase the incident angle of the first light ray 201, making the incident angle of part of the first light ray 201 greater than the critical angle of total internal reflection. The first light ray 201 undergoes total internal reflection within the light guide layer 230. When it reaches the second microstructure 232, the second microstructure 232 disrupts the total internal reflection condition of the first light ray 201, causing the first light ray 201 to be discharged from the upper surface of the light guide layer 230. At this time, the first light ray 201 exits from the display area AA of the second display unit 102, which can improve the brightness of the part of the display area AA of the second display unit 102 near the seam 110. Similarly, the second light ray emitted by the second light-emitting device 222b... When the light ray 202 strikes the surface of the second microstructure 232, the second microstructure 232 can increase the incident angle of the second light ray 202, making the incident angle of part of the second light ray 202 greater than the critical angle of total internal reflection. The second light ray 202 undergoes total internal reflection within the light guide layer 230. When it reaches the first microstructure 231, the first microstructure 231 disrupts the total internal reflection condition of the second light ray 202, causing the second light ray 202 to be emitted from the upper surface of the light guide layer 230. At this time, the second light ray 202 is emitted from the display area AA of the first display unit 101, which can improve the brightness of the part of the display area AA of the first display unit 101 near the seam 110. The light emission schematic diagram of the second light-emitting device 222b is shown in the figure, referring to the second light-emitting device 222a. Therefore, the light guide layer 230 of this application can utilize some of the light lost by the original second light-emitting device 222, such as large-angle light, and change the propagation path and direction of these light rays through the light guide layer 230, so as to realize that the large-angle light of the second light-emitting device 222 is emitted in the display area AA of the adjacent display unit 100, thereby realizing brightness compensation of the display area AA near both sides of the seam 110, realizing the uniformity of the overall brightness of the display device 10, and improving the display effect.

[0051] In some embodiments, please refer to Figures 1-3 The first microstructure 231 and the second microstructure 232 can be symmetrically arranged about the seam 110. Correspondingly, the second light-emitting devices 222 located on both sides of the seam 110 are also symmetrically arranged to ensure that the brightness compensation effect of the display area AA on both sides of the seam 110 is the same, and to ensure the overall brightness uniformity of the display device 10.

[0052] In this application, the display device 10 can be a non-bendable or non-foldable splicing display device, that is, multiple display units 100 spliced ​​together are all located on the same plane, forming a planar splicing product. The display device 10 can also be a bendable or foldable splicing display device, that is, adjacent display units 100 can be bent or folded along the seam 110. When the display device 10 is a bendable or foldable splicing display device, the structure of the display unit 100 near the seam 110 will deform during bending or folding, causing changes in the optical properties of the film layer of the display area AA near the seam 110, changes in the spacing between the light-emitting devices near the seam 110, and light interference from the light-emitting devices on both sides of the seam 110 during bending. These factors make it easier for uneven brightness to occur in some display areas on both sides of the seam 110. This application can improve the above problems through the light guide layer 230.

[0053] In this application, when the display device 10 is a bendable or foldable splicing display device, the light guide layer 230 is made of a flexible material or has a flexible structure, that is, the light guide layer 230 can be bent.

[0054] In some embodiments, please refer to Figure 3 and Figure 4 The light guide layer 230 includes a bendable region NC and a first non-bendable region ND1 and a second non-bendable region ND2 located on opposite sides of the bendable region NC. A first microstructure 231 is located in the first non-bendable region ND1, and a second microstructure 232 is located in the second non-bendable region ND2. A third microstructure 233 is disposed on the side of the light guide layer 230 away from the substrate 210, and the third microstructure 233 is located in the bendable region NC. On the one hand, the third microstructure 233 can reduce the stress of the light guide layer 230 when it is bent, ensuring the bending performance of the light guide layer 230; on the other hand, the third microstructure 233 can act as a dot matrix, which can guide some light to the outside when bent, realizing the function of ambient lighting.

[0055] In some embodiments, please refer to Figure 3 and Figure 4 The third microstructure 233 includes a plurality of first openings 234 arranged along the first direction X. The cross-section of the first opening 234 can be rectangular, trapezoidal, triangular or other regular or irregular shapes, but must meet the following conditions:

[0056] When the light guide layer 230 is in a flattened state, the width of the first opening 234 decreases along the second direction Z;

[0057] When the light guide layer 230 is in a bent state, the width of the first opening 234 increases along the second direction Z.

[0058] Please refer to Figure 3When the light guide layer 230 is in a flattened state, that is, the display device 10 is in a flattened state, that is, the included angle θ between two adjacent display units 100 is 180°. At this time, the end of the first opening 234 near the first surface 236 of the light guide layer 230 is closed or nearly closed. At this time, the light reflected by total internal reflection in the light guide layer 230 will not be exported from the first surface 236, or only a small amount of light will be exported from the first surface 236. The light reflected by total internal reflection in the light guide layer 230 is mainly exported from the display areas AA on both sides of the seam 110, so as to achieve mutual brightness compensation between the display areas AA on both sides of the seam 110.

[0059] Please refer to Figure 4 When the light guide layer 230 is in a bent state, that is, the display device 10 is in a bent state, that is, the included angle θ between two adjacent display units 100 is between 0° and 180°. At this time, the end of the first opening 234 near the first surface 236 of the light guide layer 230 is open, and the light that is totally internally reflected in the light guide layer 230 will be exported from the first opening 234. That is, the width of the first opening 234 can change during the bending process.

[0060] The first direction is the direction from the display unit 100 to the seam 110 (i.e., the X direction), the second direction is the direction from the substrate 210 to the display panel 120, and the first surface 236 is the surface of the light guide layer 230 near the display panel 120.

[0061] In some embodiments, please refer to Figure 3 and Figure 4 Both the first microstructure 231 and the second microstructure 232 include a plurality of second openings 235 arranged along the first direction X. The width of the second openings 235 decreases along the second direction Z. The cross-section of the second openings 235 may be rectangular, trapezoidal, triangular or other regular or irregular shapes, but is not limited thereto.

[0062] In some embodiments, please refer to Figures 1-3 The backlight module 200 also includes a semi-transparent and semi-reflective layer 240 and a reflective structure 250.

[0063] A semi-transparent and semi-reflective layer 240 is disposed on the light-emitting side of the second light-emitting device 222. The semi-transparent and semi-reflective layer 240 enables a portion of the light emitted from the second light-emitting device 222 to be transmitted and a portion of the light to be reflected, and directs the reflected portion of the light onto the surface of the reflective structure 250. The semi-transparent and semi-reflective layer 240 can improve the incident angle of a portion of the light emitted from the second light-emitting device 222, and at the same time improve the light emission uniformity and light emission effect of the second light-emitting device 222.

[0064] The reflective structure 250 is disposed at least on the periphery of the second light-emitting device 222, and the surface of the reflective structure 250 near the semi-transparent and semi-reflective layer 240 is inclined toward the substrate 210 in the direction from the display unit 100 to the seam 110. The reflective structure 250 can change the direction and angle of the light rays hitting its surface, which can increase the angle of some of the light rays emitted from the second light-emitting device 222 to meet the total reflection condition of the light guide layer 230, increase the brightness compensation effect on the display areas AA on both sides of the seam 110, and further improve the overall display uniformity of the display device 10.

[0065] For details, please refer to Figure 3 Part of the light emitted from the second light-emitting device 222 can pass through the semi-transparent and semi-reflective layer 240 and be emitted from the display area AA of the display panel 120. Part of the light emitted from the second light-emitting device 222 is reflected by the semi-transparent and semi-reflective layer 240 to the surface of the reflective structure 250. The reflective structure 250 can reflect the light reflected by the semi-transparent and semi-reflective layer 240 to the first microstructure 231 or the second microstructure 232 of the light guide layer 230, and then achieve total internal reflection in the light guide layer 230.

[0066] In this application, the combination of the semi-transparent and semi-reflective layer 240 and the reflective structure 250 can improve the light utilization and light emission efficiency of the second light-emitting device 222. At the same time, it can guide more light emitted from the second light-emitting device 222 into the light guide layer 230, so that some light with a small incident angle can also be fully utilized, and more light can meet the total internal reflection condition at the incident angle and enter the light guide layer 230 to achieve total internal reflection, thereby further improving the brightness compensation effect of the display areas AA on both sides of the splice 110.

[0067] In some embodiments, please refer to Figures 1-3 In the top view of the display device 10, the orthographic projection of the semi-transparent and semi-reflective layer 240 covers at least the orthographic projection of the second light-emitting device 222 and the orthographic projection of the reflective structure 250, so that the semi-transparent and semi-reflective layer 240 covers the entire second light-emitting device 222 and the reflective structure 250, which can improve the utilization rate of the light emitted by the second light-emitting device 222 and further improve the brightness compensation effect of the display areas AA on both sides of the splicing seam 110.

[0068] In some embodiments, please refer to Figure 3The reflective structure 250 can be a wedge-shaped structure. The cross-section of the wedge-shaped structure in the direction perpendicular to the display panel 120 is triangular. The inclined surface 241 of the wedge-shaped structure faces the splice 110 and is inclined towards the surface of the substrate 210. The second light-emitting device 222 is embedded in the wedge-shaped structure, and the light-emitting surface of the second light-emitting device 222 is exposed by the reflective structure 250. The second light-emitting device 222 is embedded in the wedge-shaped structure, that is, the reflective structure 250 is arranged around the second light-emitting device 222, so that the light emitted by the second light-emitting device 222 in all directions is guided towards the light guide layer 230, so that more light enters the light guide layer 230 to achieve total internal reflection, thereby further improving the brightness compensation effect of the display areas AA on both sides of the splice 110. The angle between the inclined surface 241 of the wedge-shaped structure and the plane of the substrate 210 is in the range of 30° to 60°, such as 30°, 45°, 60°, etc., but not limited to this.

[0069] In some embodiments, please refer to Figure 1 The backlight module 200 also includes a reflective layer 260, which is disposed on the side of the substrate 210 near the light-emitting device layer 220. The reflective layer 260 can reflect part of the light emitted by the first light-emitting device 221 and the second light-emitting device 222 to improve the light utilization rate of the first light-emitting device 221 and the second light-emitting device 222.

[0070] The reflective structure 250 can be disposed on the reflective layer 260, that is, the reflective structure 250 is disposed on the side of the reflective layer 260 away from the substrate 210.

[0071] The reflective structure 250 can also be embedded in the reflective layer 260. That is, a portion of the reflective structure 250 near the substrate 210 can be embedded in the reflective layer 260, while a portion of the reflective structure 250 away from the substrate can protrude from the surface of the reflective layer 260. The protruding portion can be wedge-shaped. Specifically, in the fabrication process of the reflective layer 260 and the reflective structure 250, the reflective structure 250 can be fabricated on the substrate first, and then the reflective layer 260 can be coated.

[0072] In some embodiments, the materials of the reflective structure 250 and the reflective layer 260 may be the same or different, and this application does not impose any restrictions.

[0073] In some embodiments, the reflective structure 250 and the reflective layer 260 may also be an integral structure.

[0074] In some embodiments, please refer to Figure 1The backlight module 200 also includes a light-diffusing layer 270, which is disposed on the side of the display panel 120 near the light-emitting device layer 220 and covers the display area AA. The light-diffusing layer 270 covers the light-emitting sides of the first light-emitting device 221 and the second light-emitting device 222, enabling the light emitted by the first light-emitting device 221 and the second light-emitting device 222 to pass through the light-diffusing layer 270 to be more uniform, thus ensuring uniform brightness of the backlight. The surface of the light-diffusing layer 270 typically has microstructures (such as granular or prism-like structures). When the light emitted by the light-emitting device passes through the light-diffusing layer 270, it is scattered and refracted by these microstructures, diffusing the originally concentrated light in various directions, thus making the light emitted through the light-diffusing layer 270 more uniform.

[0075] In this application, the light guide layer 230 may be located between the light uniform layers 270 of two adjacent display units 100, the light guide layer 230 may be disposed in the same layer as the light uniform layer 270, and the thickness of the light guide layer 230 may be the same as that of the light uniform layer 270.

[0076] In some embodiments, please refer to Figure 1 The backlight module 200 also includes a brightness enhancement layer 280, which is disposed between the display panel 120 and the light uniform layer 270, and at least covers the display area AA. The brightness enhancement layer 280, disposed above the light uniform layer 270, can focus light, improve brightness, and optimize contrast. The surface of the brightness enhancement layer 280 has a regular prism-like structure. When light passes through it, the prism refracts and reflects the light, concentrating the light that originally radiates in all directions into a direction perpendicular to the display panel 120 (i.e., the main viewing angle of the human eye), thereby improving brightness and contrast.

[0077] In this application, the combined use of the light-diffusing layer 270 and the brightness-enhancing layer 280 can significantly improve the brightness, uniformity, and other properties of the display device 10, thereby enhancing the display effect. Specifically, the light-diffusing layer 270 first evenly diffuses the light emitted from the light-emitting device to avoid uneven brightness, and the brightness-enhancing layer then focuses the uniform light onto the viewing direction, thereby improving brightness and contrast.

[0078] Furthermore, the orthographic projection of the brightness enhancement layer 280 can extend to the non-display area NA, covering part of the orthographic projection of the light guide layer 230, so that the light rays exported from both ends of the light guide layer 230 can enter the enhancement layer, thereby improving the utilization rate and light output efficiency of the light rays exported from the light guide layer 230.

[0079] In some embodiments, please refer to Figure 1The backlight module 200 also includes a color conversion layer 290, which is disposed between the light-emitting device layer 220 and the light-diffusing layer 270. The color conversion layer 290 needs to cover the light emission range of the first light-emitting device 221 and the second light-emitting device 222 to ensure the uniformity of the overall emitted light color. The color conversion layer 290 can convert the color of the light emitted by the first light-emitting device 221 and the second light-emitting device 222 into the desired color. For example, when the first light-emitting device 221 and the second light-emitting device 222 are blue mini-LEDs, the blue light can be converted into the desired white light emission through the color conversion layer 290, but it is not limited to this.

[0080] In some embodiments, please refer to Figure 1 The display device 10 also includes a transparent connecting layer 111, which is disposed at the seam 110 and connects adjacent display panels 120. The transparent connecting layer 111 is flexible and can be bent. The transparent connecting layer 111 is light-transmitting; when the display device 10 is bent, some of the light emanating from the third microstructure 233 on the light guide layer 230 can pass through the transparent connecting layer 111 to achieve an ambient lighting effect.

[0081] In some embodiments, please refer to Figures 5a-5c When the display device 10 is a foldable splicing display device 10, there is an included angle θ between adjacent display units 100. The included angle θ ranges from 0° to 180°, such as 0°, 30°, 45°, 60°, 90°, 135°, 180°, etc. The included angle θ can be any angle between 0° and 180°. Figure 5a This is a schematic diagram of the fully closed (i.e., θ = 0°) state of the display device 10. Figure 5b This is a schematic diagram of the display device 10 in a half-open (i.e., 0° < θ < 180°) state. Figure 5c This is a schematic diagram of the fully open (i.e., θ = 180°) state of the display device 10. During the bending process of the display device 10, some of the light emitted from the second light-emitting device 220 is guided out through the third microstructure 233 on the light guide layer 230 and directed to the outside from the seam 110. As the included angle θ increases, the brightness at the seam 110 can increase or decrease, that is, the brightness at the seam 110 can change with the size of the included angle θ. This application can realize the brightness adjustment of the ambient light located at the seam 110 by adjusting the opening angle θ of the foldable display device 10 to achieve different modes, such as a breathing light mode (brightness adjustable), a constant light mode, etc. Different functions can be realized by controlling the driving current of the second light-emitting device 222, program design, etc. For specific implementation methods, refer to the prior art. Among them, the display device 10 can be in the form of outward folding, that is, after folding, the display panel 120 is located on the outside.

[0082] In some embodiments, please refer to Figure 1The display device 10 also includes a housing 300, on which structures such as the backlight module 200 and the display panel 120 are disposed. The housing 300 provides support and protection for the backlight module 200, the display panel 120, and other structures. When the display device 10 is a foldable display device, the housing 300 also includes a hinge structure, which corresponds to the seam 110 to realize the foldable function of the display device 10. The specific hinge structure can refer to the prior art.

[0083] This application provides a display device. The display device comprises a light guide layer disposed between two interconnected backlight modules. This light guide layer is located between the light-emitting device layer and the display panel, and at least covers the seam. A first microstructure and a second microstructure are disposed on the side of the light guide layer closest to the substrate. The first and second microstructures are spaced apart and located on opposite sides of the seam. The light guide layer is disposed between adjacent backlight modules. Part of the light emitted from the second light-emitting devices located on both sides of the seam is incident on the first or second microstructure and undergoes total internal reflection within the light guide layer. This guides the light emitted from the second light-emitting devices to the display area of ​​the adjacent display unit. In other words, the light guide layer cross-guides the light emitted from the second light-emitting devices on both sides of the seam to the display areas on opposite sides of the seam, thereby achieving brightness compensation for the display areas near the seam and achieving overall brightness uniformity of the display device, thus improving the display effect.

[0084] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0085] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0086] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0087] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display device, characterized in that, It includes multiple display units spliced ​​together, with seams between adjacent display units. Each display unit includes a backlight module and a display panel disposed on the light-emitting side of the backlight module. The backlight module includes: Substrate; and A light-emitting device layer is disposed on the side of the substrate close to the display panel. The light-emitting device layer includes a first light-emitting device and a second light-emitting device. The second light-emitting device is located between the first light-emitting device and the seam, and the second light-emitting device is disposed adjacent to the seam. A light guide layer is provided between the backlight modules of adjacent display units. The light guide layer is located above the light-emitting device layer and at least covers the seam. A first microstructure and a second microstructure are provided on the side of the light guide layer near the substrate. The first microstructure and the second microstructure are located on opposite sides of the seam. After a portion of the light emitted from the second light-emitting device is incident on the first microstructure or the second microstructure, it undergoes total internal reflection within the light guide layer, thereby guiding a portion of the light emitted from the second light-emitting device to be emitted from the display area of ​​the adjacent display unit.

2. The display device according to claim 1, characterized in that, The first microstructure and the second microstructure are located at opposite ends of the light guide layer on the side near the substrate, and the first microstructure and the second microstructure are symmetrically arranged about the seam.

3. The display device according to claim 1, characterized in that, The light guide layer includes a bendable area and a first non-bendable area and a second non-bendable area located on opposite sides of the bendable area. The first microstructure is located in the first non-bendable area, and the second microstructure is located in the second non-bendable area. A third microstructure is provided on the side of the light guide layer away from the substrate, and the third microstructure is located in the bendable region.

4. The display device according to claim 3, characterized in that, The third microstructure includes a plurality of first openings arranged along a first direction, the first direction being the direction from the display unit to the seam; When the light guide layer is in a flattened state, the width of the first opening decreases along the second direction; When the light guide layer is in a bent state, the width of the first opening increases along the second direction, which is the direction from the substrate to the display panel.

5. The display device according to any one of claims 1 to 4, characterized in that, The backlight module also includes: A semi-transparent, semi-reflective layer is disposed on the light-emitting side of the second light-emitting device; and A reflective structure is disposed at least on the periphery of the second light-emitting device, and the surface of the reflective structure near the semi-transparent and semi-reflective layer is inclined toward the substrate in the direction from the display unit to the seam.

6. The display device according to claim 5, characterized in that, In the top view of the display device, the orthographic projection of the semi-transparent and semi-reflective layer at least covers the orthographic projection of the second light-emitting device and the orthographic projection of the reflective structure.

7. The display device according to claim 5, characterized in that, The reflective structure is a wedge-shaped structure, the second light-emitting device is embedded in the wedge-shaped structure, and the reflective structure exposes the light-emitting surface of the second light-emitting device.

8. The display device according to claim 5, characterized in that, The backlight module also includes: A reflective layer is disposed on the side of the substrate near the light-emitting device layer; The reflective structure is disposed on the reflective layer, or the reflective structure is embedded in the reflective layer.

9. The display device according to claim 5, characterized in that, The backlight module also includes: A light-diffusing layer is disposed on the side of the display panel near the light-emitting device layer, wherein the light guide layer is located between the light-diffusing layers of two adjacent display units; A brightness enhancement layer is disposed between the display panel and the light uniform layer.

10. The display device according to claim 5, characterized in that, During the bending process of the display device, some of the light emitted by the second light-emitting device is led out from the seam. There is an angle θ between adjacent display units. As the angle θ increases, the brightness at the seam increases or decreases. The angle θ ranges from 0° to 180°.

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