Light-emitting substrate, tiled light-emitting module, and display device

Abstract

The present application provides a light-emitting substrate, a tiled light-emitting module, and a display device. The light-emitting substrate comprises a first region and a second region, and the second region is located on at least one side of the first region. The light-emitting substrate comprises a base, a plurality of light-emitting units located on the base, a diffusion plate, and a light adjustment layer. The light-emitting units are located in the first region. The diffusion plate is located on the sides of the light-emitting units away from the base, and the diffusion plate is located in the first region and the second region. The light adjustment layer is located on the sides of the light-emitting units away from the base, and at least one of the side of the diffusion plate away from the base and the side of the diffusion plate facing the base is provided with the light adjustment layer. From the first region to the edge of the light-emitting substrate, the light transmittance of the light adjustment layer in the second region gradually increases, and the light transmittance of the light adjustment layer in the first region is less than or equal to the minimum light transmittance of the light adjustment layer in the second region.

Description

Light-emitting substrate, splicing light-emitting module and display device Technical Field

[0001] This application relates to the field of display technology, and in particular to a light-emitting substrate, a splicing light-emitting module, and a display device. Background Technology

[0002] Mini-LED and Micro LED are new LED display technologies derived from small-pitch LEDs, also known as submillimeter light-emitting diodes. Due to their superior display effects, slim profile, high contrast ratio, and long lifespan, they are gaining significant traction in the display industry.

[0003] The brightness of the edge area of ​​existing LED displays is lower than that of the center area, resulting in a poorer visual experience for users. Summary of the Invention

[0004] This application provides a light-emitting substrate, a splicing light-emitting module, and a display device.

[0005] A first aspect of this application provides a light-emitting substrate. The light-emitting substrate includes a first region and a second region, the second region being located at least one side of the first region, and the light-emitting substrate includes: a substrate;

[0006] A plurality of light-emitting units are located on the substrate in the first region; a diffuser plate is located on the side of the light-emitting units away from the substrate; the diffuser plate is located in both the first region and the second region; a light-adjusting layer is located on the side of the light-emitting units away from the substrate; at least one of the diffuser plate on the side away from the substrate and the side facing the substrate is provided with the light-adjusting layer; from the first region to the edge of the light-emitting substrate, the transmittance of the light-adjusting layer in the second region gradually increases; the transmittance of the light-adjusting layer in the first region is less than or equal to the minimum transmittance of the light-adjusting layer in the second region.

[0007] In one embodiment, the light adjustment layer in the second region includes a plurality of dimming units arranged in a dispersed manner, and the coverage of the dimming units per unit area in the second region gradually decreases from the first region to the edge of the light-emitting substrate.

[0008] In one embodiment, each of the dimming units has the same area, and the density of the dimming units gradually decreases from the first region to the edge of the light-emitting substrate; or, in a portion of the light-adjusting layer located within the second region, the density of the dimming units is the same, and the area of ​​the dimming units gradually decreases from the first region to the edge of the light-emitting substrate.

[0009] In one embodiment, the light-adjusting layer in the second region includes a plurality of dispersed cutouts, and the coverage of the cutouts per unit area in the second region gradually increases from the first region to the edge of the light-emitting substrate.

[0010] In one embodiment, each of the cutout portions has the same area, and the density of the cutout portions gradually increases from the first region to the edge of the light-emitting substrate; or, in the portion of the light-adjusting layer located within the second region, the density of the cutout portions is the same, and the area of ​​the cutout portions gradually increases from the first region to the edge of the light-emitting substrate.

[0011] In one embodiment, the light conditioning layer contains a plurality of scattering particles.

[0012] In one embodiment, the particle size of the scattering particles in the light-adjusting layer in the second region gradually decreases from the first region to the edge of the light-adjusting layer.

[0013] In one embodiment, the particle size of the scattering particles ranges from 3 micrometers to 6 micrometers.

[0014] In one embodiment, the coverage of the light-adjusting layer per unit area of ​​the second region is at least 20%.

[0015] In one embodiment, the thickness of the light-modulating layer in the second region gradually decreases from the first region to the edge of the light-emitting substrate.

[0016] In one embodiment, the thickness of the light-modulating layer in the second region is at least 3 micrometers.

[0017] In one embodiment, the light-emitting substrate further includes a support portion located on the side of the diffuser plate facing the light-emitting unit, the support portion being located in the second region.

[0018] In one embodiment, the diffuser plate is provided with the light-adjusting layer on both the side away from the light-emitting unit and the side facing the light-emitting unit.

[0019] A second aspect of this application provides a splicing light-emitting module and a display device. The splicing light-emitting module includes the aforementioned light-emitting substrate, with adjacent light-emitting substrates spliced ​​together.

[0020] A third aspect of this application provides a display device, which includes the above-described light-emitting substrate or the above-described splicing light-emitting module.

[0021] The light-emitting substrate, splicing light-emitting module, and display device provided in this application embodiment improve the brightness uniformity of the second region by setting the light-emitting substrate so that the transmittance of the light-adjusting layer in the second region gradually increases from the first region to the edge of the light-emitting substrate. This improves the problem of uneven brightness in the second region of the light-emitting substrate and the appearance of shadows in the second region due to the uneven distribution of light emitted by the light-emitting unit in the second region. By setting the transmittance of the light-adjusting layer in the first region to be less than or equal to the minimum transmittance of the light-adjusting layer in the second region, it helps to avoid the brightness difference between the first and second regions caused by the amount of light emitted by the light-emitting unit incident on the second region being less than the amount incident on the first region, thereby improving the brightness uniformity of the light-emitting substrate.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this specification and, together with the description, serve to explain the principles of this specification.

[0024] Figure 1 is a partial structural schematic diagram of a light-emitting substrate provided in an embodiment of this application;

[0025] Figure 2 is a partial enlarged view of part A in the embodiment shown in Figure 1;

[0026] Figure 3 is a partial structural schematic diagram of the light adjustment layer provided in an embodiment of this application;

[0027] Figure 4 is a partial structural schematic diagram of the light adjustment layer provided in another embodiment of this application;

[0028] Figure 5 is a comparison of the transmittance curves of the embodiments shown in Figures 3 and 4;

[0029] Figure 6 is a schematic diagram of the structure of a splicing light-emitting module provided in an embodiment of this application;

[0030] Figure 7 is a partial enlarged view of part B in the embodiment shown in Figure 6;

[0031] Figure 8 is a partial enlarged view of the outer frame of the light-emitting substrate of the spliced ​​light-emitting module in the related technology;

[0032] Figure 9 is a graph showing the relative brightness curves on both sides of the outer frame of the light-emitting substrate in the embodiment shown in Figure 8;

[0033] Figure 10 is a relative brightness curve of the splicing light-emitting module provided in an embodiment of this application and the splicing light-emitting module provided in related technologies on the outer frame side of the light-emitting substrate. Detailed Implementation

[0034] The light-emitting substrate, splicing light-emitting module, and display device according to embodiments of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementation methods can complement or combine with each other.

[0035] This application provides a light-emitting substrate, as shown in Figures 1 and 2. The light-emitting substrate 100 includes a first region 11 and a second region 12, wherein the second region 12 is located on at least one side of the first region 11.

[0036] The light-emitting substrate includes a substrate 20, a plurality of light-emitting units 21 located on the substrate 20, a diffuser plate 30, and a light-adjusting layer 40. The plurality of light-emitting units 21 are located in a first region 11. The diffuser plate 30 is located on the side of the light-emitting units 21 away from the substrate 20, and the diffuser plate 30 is located in both the first region 11 and the second region 12. The light-adjusting layer 40 is located on the side of the light-emitting units 21 away from the substrate 20, and at least one of the diffuser plate 30 is provided on the side away from the substrate 20 and the side facing the substrate 20. From the first region 11 to the edge of the light-emitting substrate 100, the transmittance of the light-adjusting layer 40 located in the second region 12 gradually increases, and the transmittance of the light-adjusting layer 40 in the first region 11 is less than or equal to the minimum transmittance of the light-adjusting layer 40 in the second region 12.

[0037] The first region 11 can be the central region of the light-emitting substrate 100, and the second region 12 can be the edge region of the light-emitting substrate 100, surrounding the first region 11. The diffuser plate 30 covers the first region 11 and the second region 12 of the light-emitting substrate 100, which can fully scatter the light emitted by the light-emitting unit 21, making the brightness of the light-emitting substrate 100 more uniform.

[0038] The light-emitting substrate 100 also includes a middle frame 52, which includes a support portion 521 located on the side of the diffuser plate 30 facing the light-emitting unit 21. The support portion 521 is located in the second region 12. The arrangement of the support portion 521 prevents the placement of a light-emitting unit in the second region 12 of the light-emitting substrate 100. The amount of light emitted by the light-emitting unit in the first region 11 that propagates to the second region 12 is relatively small, and the light is blocked by the support portion 521 during propagation. As a result, the propagation path of the light emitted by the light-emitting unit 21 gradually increases from the edge of the second region near the first region 11 to the edge of the light-emitting substrate 100, and the amount of light blocked by the support portion 521 gradually increases. This causes the intensity of the light reaching the second region 12 to gradually weaken, resulting in a decrease in brightness in the second region 12 from the first region 11 to the edge of the light-emitting substrate 100. Visually, the edge of the light-emitting substrate 100 appears as a shadow when it emits light.

[0039] The display substrate provided in this application embodiment improves the brightness uniformity of the second region 12 by setting the light-emitting substrate 100 such that the light transmittance of the light-adjusting layer 40 located in the second region 12 gradually increases from the first region 11 to the edge of the light-emitting substrate 100. This improves the problem of uneven brightness in the second region of the light-emitting substrate 100 caused by uneven distribution of light emitted by the light-emitting unit 21 in the second region, and also addresses the problem of shadows appearing in the second region. By setting the light transmittance of the light-adjusting layer 40 in the first region 11 to be less than or equal to the minimum light transmittance of the light-adjusting layer in the second region 12, it helps to avoid brightness differences between the first region 11 and the second region 12 caused by uneven distribution of light, thereby improving the brightness uniformity of the light-emitting substrate 100.

[0040] In one embodiment, the substrate 20 may be a PCB substrate, and the light-emitting unit 21 may be mounted on the PCB substrate by SMT (Surface Mount Technology).

[0041] In one embodiment, each light-emitting unit 21 includes at least one light-emitting element, which may include an inorganic light-emitting diode with a size on the order of hundreds of micrometers or less. The inorganic light-emitting diode with a size on the order of hundreds of micrometers or less may be a mini LED or a micro LED. The size range of a mini LED is approximately 100 μm to 500 μm, and the size of a micro LED is less than 100 μm. The light-emitting unit 21 may be a blue LED or a white LED. In some embodiments, the light-emitting unit 21 includes a plurality of refractive lenses that cover the light-emitting surface of the light-emitting element to change and control the distribution of light.

[0042] In one embodiment, the light-emitting substrate 100 further includes a reflective layer located between the substrate 20 and the light-emitting unit 21. The reflective layer can reflect light emitted toward the substrate, and the reflected light is incident on the diffuser plate, thereby improving the utilization rate of light, reducing light loss, and helping to reduce the power consumption of the light-emitting substrate.

[0043] In one embodiment, as shown in FIG1, the light-emitting substrate 100 further includes a back plate 51. The back plate 51 is located on the side of the substrate 20 away from the light-emitting unit 21. The substrate 20 can be attached to the surface of the back plate 51 by thermally conductive adhesive. The back plate 51 can improve the rigidity of the overall structure of the light-emitting substrate 100, provide support for components such as the substrate 20, and the heat inside the light-emitting substrate 100 can also be discharged through the back plate 51.

[0044] In one embodiment, the support portion 521 is located in the second region 12. Since the support portion 521 obstructs the propagation of light emitted by the light-emitting unit 21, its location in the second region 12 allows the light-adjusting layer 40 within the second region 12 to compensate for the brightness loss caused by the support portion 521. The width of the second region 12 can be determined based on the size of the support portion. With the entire support portion 521 located within the second region 12, and its width being less than or equal to the width of the second region 12, the brightness uniformity of the light-emitting substrate can be effectively improved. The support portion 521 also supports and reinforces the light-emitting substrate 100, ensuring its strength and stability.

[0045] In some embodiments, the portion of the back plate 51 located in the second region 12 is bent toward the diffuser plate 30 and extends to form a connecting portion 511. The connecting portion 511 is connected to the middle frame 52 by screws, and the top of the support portion 521 is attached to the edge of the diffuser plate 30 by adhesive.

[0046] In one embodiment, the diffuser plate 30 is provided with the light adjustment layer 40 on both the side away from the light-emitting unit 21 and the side facing one of the light-emitting units 21. The light adjustment layers 40 on both sides of the diffuser plate 30 can further improve the brightness uniformity of the light-emitting substrate 100.

[0047] In one embodiment, the light conditioning layer 40 contains multiple scattering particles. These scattering particles effectively disperse and diffuse light, resulting in more uniform light scattering. The black arrows in Figure 2 represent the direction of light propagation. As can be seen from Figure 2, some of the light incident on the light conditioning layer 40 is reflected, and some light is scattered as it passes through the light conditioning layer 40, resulting in a more uniform distribution of light emitted through the light conditioning layer 40.

[0048] In one embodiment, the light-adjusting layer 40 may be a diffusion ink printed on the surface of the diffusion plate 30. The diffusion ink can eliminate light spots caused by the light from the light-emitting unit 21 by scattering, making the brightness of the light-emitting substrate 100 more uniform.

[0049] Specifically, when the light-adjusting layer 40 is a diffusion ink, the diffusion ink may include resin, scattering particles, and additives. The resin provides adhesion and improves the film-forming properties of the diffusion ink. The scattering particles may include PMMA (Polymethyl Methacrylate) particles, titanium dioxide particles, and silica particles. PMMA particles scatter light, resulting in a more uniform light distribution, and their high transparency gives the diffusion ink good light transmittance. Titanium dioxide particles are white and provide the diffusion ink with a high refractive index and good opacity. Silica particles are transparent and enhance the transparency of the diffusion ink, improving its light-scattering effect. By adjusting the ratio and concentration of titanium dioxide and silica particles, the light transmittance of the diffusion ink can be adjusted.

[0050] In one embodiment, from the first region 11 to the edge of the light-adjusting layer 40, the particle size of the scattering particles in the light-adjusting layer 40 in the second region 12 gradually decreases. The smaller the particle size of the scattering particles, the weaker their light-blocking effect, thereby increasing the light transmittance and improving the brightness uniformity of the second region 12.

[0051] Furthermore, the density of scattering particles in the light-adjusting layer within the second region 12 is the same, or the density of scattering particles in the light-adjusting layer 40 within the second region 12 gradually decreases from the first region 11 to the edge of the light-adjusting layer 40.

[0052] In one embodiment, the particle size of the scattering particles ranges from 3 micrometers to 6 micrometers. This setting avoids both excessively large particle sizes that would reduce light emission and consequently lead to insufficient overall brightness of the light-emitting substrate, and excessively small particle sizes that would result in poor light scattering performance. In some embodiments, the particle size of the scattering particles may be, for example, 3 micrometers, 4 micrometers, 5 micrometers, or 6 micrometers.

[0053] In one embodiment, the thickness of the light-adjusting layer 40 in the second region 12 gradually decreases from the first region 11 to the edge of the light-emitting substrate 100. The thicker the light-adjusting layer 40, the lower its light transmittance. By gradually reducing the thickness of the light-adjusting layer 40 in the second region 12, the light transmittance of the second region 12 can be gradually increased, thereby improving the brightness uniformity of the second region 12.

[0054] Furthermore, the density of scattering particles in the light-adjusting layer 40 within the second region 12 is the same, and the particle size of the scattering particles in the light-adjusting layer 40 within the second region 12 gradually decreases from the first region 11 to the edge of the light-adjusting layer 40. Alternatively, the particle size of the scattering particles in the light-adjusting layer 40 within the second region 12 remains constant, and the density of the scattering particles in the light-adjusting layer 40 within the second region 12 gradually decreases from the first region 11 to the edge of the light-adjusting layer 40.

[0055] In one embodiment, the thickness of the light-adjusting layer 40 within the second region 12 is at least 3 micrometers. This configuration avoids the light-adjusting layer 40 being too thin, which would result in insufficient dispersion of the light emitted through the light-adjusting layer 40 and consequently reduce the uniformity of light in the second region 12.

[0056] In one embodiment, as shown in Figures 2, 3, and 4, the light-adjusting layer 40 in the second region 12 includes a plurality of dimming units 41 arranged in a dispersed manner. From the first region 11 to the edge of the light-emitting substrate, the coverage of the dimming units 41 per unit area gradually decreases. The transmittance of the portion of the second region 12 not covered by the dimming units 41 is greater than the transmittance of the portion covered by the dimming units 41. Therefore, the transmittance of the second region 12 can be adjusted by adjusting the coverage of the dimming units 41 per unit area. In the portion of the light-adjusting layer 40 located in the second region 12, the amount of light incident on the light-adjusting layer 40 gradually decreases from the edge of the second region 12 near the first region 11 to the edge of the second region 12 away from the first region 11. By setting the coverage of the dimming units 41 in the second region 12 to gradually decrease from the edge of the first region 11 to the edge of the light-emitting substrate 100, the transmittance of the light-adjusting layer 40 can be gradually increased, thereby improving the brightness uniformity of the second region 12.

[0057] Figures 3 and 4 are schematic diagrams of two different light-adjusting layers. In the embodiment shown in Figure 3, the light-adjusting layer is located in the second region 12, and the coverage of the dimming part 41 per unit area gradually decreases from 100% to 80% from the first region 11 to the edge of the light-emitting substrate 100. In the embodiment shown in Figure 4, the light-adjusting layer is located in the second region 12, and the coverage of the dimming part 41 per unit area gradually decreases from 100% to 60% from the first region 11 to the edge of the light-emitting substrate 100. Figure 5 is a graph showing the relationship between the transmittance of the three different light-adjusting layers and the distance from the position of the light-adjusting layer to the reference position of the first region. In Figure 5, the horizontal axis at 10 mm is the boundary line between the first region and the second region, and the reference position is the position in the first region 10 mm away from this boundary line. In Figure 5, the light-adjusting layer corresponding to straight line a covers the first and second regions of the light-emitting substrate, and the light transmittance of each region of the light-adjusting layer is 50%. Curve b is the transmittance change curve of the portion of the light-adjusting layer located in the second region 12 in the embodiment shown in Figure 3. It can be seen that from the first region 11 to the edge of the light-emitting substrate 100, that is, from the 10mm position to the 20mm position, the transmittance of the second region 12 gradually increases from 50% to 60%. Curve c is the transmittance change curve of the second region 12 in the embodiment shown in Figure 4. From the first region 11 to the edge of the light-emitting substrate 100, the transmittance of the second region 12 gradually increases from 50% to 80%.

[0058] In one embodiment, each of the dimming units 41 has the same area, and the density of the dimming units 41 gradually decreases from the first region 11 to the edge of the light-emitting substrate 100. When the area of ​​the dimming units 41 is constant, the decrease in the density of the dimming units 41 increases the light transmittance of the corresponding region of the light-adjusting layer. This arrangement allows the transmittance of the portion of the light-adjusting layer located in the second region 12 to gradually increase from the first region 11 to the edge of the light-emitting substrate 100, making the brightness of the second region 12 more uniform than that of the first region 11.

[0059] In one embodiment, within the portion of the light-adjusting layer located in the second region 12, the density of the dimming units 41 is uniform, and the area of ​​the dimming units 41 gradually decreases from the first region 11 to the edge of the light-emitting substrate 100. When the density of the dimming units 41 is constant, reducing the area of ​​the dimming units 41 increases the light transmittance of the corresponding region of the light-adjusting layer. This arrangement allows the light transmittance of the portion of the light-adjusting layer located in the second region 12 to gradually increase from the first region 11 to the edge of the light-emitting substrate 100, resulting in more uniform brightness between the second region 12 and the first region 11.

[0060] In one embodiment, the area and density of the dimming portion 41 gradually decrease from the first region 11 to the edge of the light-emitting substrate 100. This allows for more effective adjustment of the light transmittance of different regions of the light-adjusting layer 40 within the second region 12.

[0061] In one embodiment, when the portion of the light-adjusting layer 40 located within the second region 12 includes a plurality of dimming units 41 arranged in a dispersed manner, the portion of the light-adjusting layer 40 located within the second region 12 can be printed onto the surface of the diffuser plate 30 using a screen printing process.

[0062] In one embodiment, the light-adjusting layer 40 within the second region 12 includes a plurality of dispersed cutouts. The light-adjusting layer 40 is located within a portion of the second region 12, and the coverage of the cutouts per unit area gradually increases from the first region 11 to the edge of the light-emitting substrate 100. The cutouts allow light emitted by the light-emitting unit 21 to pass through directly with almost no light loss. Therefore, the light transmittance of the second region 12 can be adjusted by regulating the coverage of the cutouts per unit area.

[0063] Specifically, the greater the coverage of the hollow portion in the light adjustment layer 40, the greater the light transmittance of the light adjustment layer 40. Since the light adjustment layer 40 is located in the portion within the second region 12, from the first region 11 to the edge of the light-emitting substrate 100, as the coverage of the hollow portion per unit area of ​​the second region 12 gradually increases, the light transmittance of the second region 12 gradually increases, thereby improving the brightness of the second region 12 and making the brightness of the second region 12 basically the same as that of the first region 11, thus visually improving the shadow problem that appears in the second region 12.

[0064] In one embodiment, each of the cutout portions has the same area. Within the portion of the light-adjusting layer 40 located in the second region 12, the density of the cutout portions gradually increases from the first region 11 to the edge of the light-emitting substrate 100. When the area of ​​the cutout portion is constant, increasing the density of the cutout portion can increase the light transmittance of the corresponding area of ​​the light-adjusting layer. This arrangement allows the light transmittance of the portion of the light-adjusting layer located in the second region 12 to gradually increase from the first region 11 to the edge of the light-emitting substrate 100, resulting in more uniform brightness between the second region 12 and the first region 11.

[0065] In one embodiment, the portion of the light-adjusting layer 40 located within the second region 12 has a uniform density of cutouts. From the first region 11 to the edge of the light-emitting substrate 100, the area of ​​the cutouts gradually increases. When the density of the cutouts is constant, increasing the area of ​​the cutouts can increase the light transmittance of the corresponding region of the light-adjusting layer. This arrangement allows the light transmittance of the portion of the light-adjusting layer located within the second region 12 to gradually increase from the first region 11 to the edge of the light-emitting substrate 100, making the brightness of the second region 12 and the first region 11 more uniform.

[0066] In one embodiment, the area and density of the cutout portion gradually increase from the first region 11 to the edge of the light-emitting substrate 100, so as to more effectively adjust the light transmittance of different regions of the light-adjusting layer 40 in the second region 12.

[0067] In one embodiment, the cutout can be prepared using screen printing technology. An ink masking structure can be prepared on a screen, and after the ink is diffused and printed, the cutout is formed at the ink masking structure. Alternatively, after forming a complete ink layer through spin coating, the cutout can be etched using an etching process.

[0068] In one embodiment, the coverage of the light adjustment layer 40 within a unit area of ​​the second region 12 is at least 20%. This setting avoids the light from being insufficiently dispersed due to excessively low coverage of the light adjustment layer 40, which would reduce the uniformity of light in the second region 12.

[0069] A second aspect of this application provides a spliced ​​light-emitting module 200, which includes a plurality of light-emitting substrates 100 provided in the above embodiments, with adjacent light-emitting substrates 100 spliced ​​together.

[0070] In one embodiment, as shown in FIG6, the splicing light-emitting module 200 further includes a plurality of splicing frames 60, each of the light-emitting substrates 100 being fixed on the splicing frame 60, and the light-emitting unit being opposite to the splicing frame 60; adjacent splicing frames 60 are spliced ​​together. A portion of the edge of the splicing frame 60 is located in the gap between two adjacent light-emitting units.

[0071] As shown in Figure 6, the spliced ​​light-emitting module 200 includes four spliced ​​light-emitting substrates 100, each with a border at its edge. Figure 7 shows a partial enlarged view of region B of the light-emitting module shown in Figure 6. As can be seen from Figure 7, the width of the shaded areas on both sides of the border 70 of the light-emitting substrates is relatively small.

[0072] In related technologies, such as the embodiment shown in Figure 8, the light-adjusting layer has essentially the same transmittance in both the first and second regions. After the two light-emitting substrates 100' are spliced ​​together, shadow areas appear on both sides of the light-emitting substrate frame 70', causing the visual size of the light-emitting substrate frame 70' to be larger than its actual size. Figure 9 shows the brightness curve of the spliced ​​light-emitting module at the light-emitting substrate frame 70' in the embodiment shown in Figure 8. The horizontal axis represents the distance between the light-emitting area of ​​the light-emitting substrate and the frame, and the vertical axis represents the ratio of the brightness of each point of the light-emitting area of ​​the light-emitting substrate to the maximum brightness of the light-emitting substrate. In Figure 9, part c represents the area where the outer frame 60' of the light-emitting substrate is located, and part d represents the area where the brightness of the light-emitting substrate 100' is relatively low. For spliced ​​light-emitting modules, areas with a relative brightness of less than 70% appear as shadow areas to the human eye, as shown in Figure 9. The width of part c is about 2 to 3 pixels. On both sides of part c, the relative brightness of the area about 5 pixels wide is less than 70%. To the human eye, the width of the shadow area created by splicing two adjacent light-emitting substrates of the spliced ​​light-emitting module is about 13 pixels. Therefore, it will cause a severe sense of fragmentation in the display image, which is not conducive to improving the user's viewing experience.

[0073] Comparing Figures 7 and 8, it can be seen that the width of the shadowed areas on both sides of the frame 70 of the light-emitting substrate 100 provided in this embodiment of the application is reduced, which helps to improve the user experience. In Figure 10, the horizontal axis represents the distance between the light-emitting area of ​​the light-emitting substrate and the frame, and the vertical axis represents the ratio of the brightness of each point of the light-emitting area of ​​the light-emitting substrate to the maximum brightness of the light-emitting substrate. Curve e is the relative brightness change curve of the right side of the frame of the light-emitting substrate when the transmittance of the light-adjusting layer in the second region of the light-emitting substrate remains unchanged. In the area where the light-emitting substrate is about 8 pixels away from the frame, the relative brightness is less than 70%. Therefore, visually, the total width of the shadowed areas on both sides of the frame of the light-emitting substrate is about 16 pixels. Curve f is the relative brightness change curve of the right side of the frame of the light-emitting substrate when the transmittance of the light-adjusting layer in the second region of the light-emitting substrate gradually increases. In the area where the light-emitting substrate is about 4 pixels away from the frame, the relative brightness is less than 70%. Therefore, visually, the total width of the shadowed areas on both sides of the frame of the light-emitting substrate is about 8 pixels, thereby visually reducing the width of the frame of the light-emitting substrate.

[0074] A third aspect of this application provides a display device, which includes the light-emitting substrate 100 in the above embodiments or the splicing light-emitting module 200 in the above embodiments.

[0075] In one embodiment, the light-emitting substrate is used as a backlight for a liquid crystal display panel, and the liquid crystal display device further includes a liquid crystal panel located on the side of the light-emitting substrate facing away from the substrate. In other embodiments, the light-emitting substrate may also be used directly as the light-emitting panel of the display device.

[0076] This application does not impose specific limitations on the application of display devices, which can be any product or component with display function, such as televisions, laptops, tablets, wearable display devices, mobile phones, in-vehicle displays, navigation systems, e-books, digital photo frames, and advertising light boxes.

Claims

1. A light-emitting substrate, characterized in that, The light-emitting substrate includes a first region and a second region, wherein the second region is located on at least one side of the first region, and the light-emitting substrate includes: Substrate; Multiple light-emitting units located on the substrate are located in the first region; A diffuser plate is located on the side of the light-emitting unit away from the substrate; the diffuser plate is located in the first region and the second region; A light-adjusting layer is located on the side of the light-emitting unit away from the substrate; the light-adjusting layer is provided on at least one of the side of the diffuser plate away from the substrate and the side facing the substrate; the transmittance of the light-adjusting layer in the second region gradually increases from the first region to the edge of the light-emitting substrate; the transmittance of the light-adjusting layer in the first region is less than or equal to the minimum transmittance of the light-adjusting layer in the second region.

2. The light-emitting substrate according to claim 1, characterized in that, The light adjustment layer in the second region includes multiple dimming units arranged in a dispersed manner. From the first region to the edge of the light-emitting substrate, the coverage of the dimming units per unit area in the second region gradually decreases.

3. The light-emitting substrate according to claim 2, characterized in that, Each of the dimming units has the same area, and the density of the dimming units gradually decreases from the first region to the edge of the light-emitting substrate. Alternatively, the light-adjusting layer is located in a portion of the second region, the dimming portions have the same density, and the area of ​​the dimming portions gradually decreases from the first region to the edge of the light-emitting substrate.

4. The light-emitting substrate according to claim 1, characterized in that, The light-adjusting layer in the second region includes multiple dispersed cutouts. From the first region to the edge of the light-emitting substrate, the coverage of the cutouts per unit area in the second region gradually increases.

5. The light-emitting substrate according to claim 4, characterized in that, Each of the cutout portions has the same area, and the density of the cutout portions gradually increases from the first region to the edge of the light-emitting substrate; Alternatively, the light-adjusting layer is located in a portion of the second region, the density of the cutouts is the same, and the area of ​​the cutouts gradually increases from the first region to the edge of the light-emitting substrate.

6. The light-emitting substrate according to claim 1, characterized in that, The light-adjusting layer contains multiple scattering particles.

7. The light-emitting substrate according to claim 6, characterized in that, From the first region to the edge of the light-adjusting layer, the particle size of the scattering particles in the light-adjusting layer in the second region gradually decreases.

8. The light-emitting substrate according to claim 7, characterized in that, The particle size of the scattering particles ranges from 3 micrometers to 6 micrometers.

9. The light-emitting substrate according to any one of claims 2 to 8, characterized in that, The coverage of the light-adjusting layer per unit area in the second region is at least 20%.

10. The light-emitting substrate according to claim 1, characterized in that, From the first region to the edge of the light-emitting substrate, the thickness of the light-adjusting layer in the second region gradually decreases.

11. The light-emitting substrate according to claim 10, characterized in that, The minimum thickness of the light-modulating layer in the second region is 3 micrometers.

12. The light-emitting substrate according to claim 1, characterized in that, The light-emitting substrate further includes a support portion located on the side of the diffuser plate facing the light-emitting unit, and the support portion is located in the second region.

13. The light-emitting substrate according to claim 1, characterized in that, The diffuser plate is provided with the light adjustment layer on both the side away from the light-emitting unit and the side facing the light-emitting unit.

14. A splicing light-emitting module, characterized in that, The spliced ​​light-emitting module includes a light-emitting substrate as described in any one of claims 1 to 13, with adjacent light-emitting substrates spliced ​​together.

15. A display device, characterized in that, The display device includes a light-emitting substrate as described in any one of claims 1 to 13 or a splicing light-emitting module as described in claim 14.

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