Light-emitting substrate, display module and display device

Abstract

The invention provides a light-emitting substrate, a display module and a display device, and belongs to the technical field of display. The light-emitting substrate comprises a substrate body, a plurality of light-emitting elements arranged on the substrate body, a first reflecting layer arranged on the light-emitting elements away from the light-emitting side, a light guide plate arranged on the light-emitting elements close to the light-emitting side and a second reflecting layer. The surface of the light guide plate deviating from the light-emitting side is closer to the substrate than the surface of the second reflecting layer deviating from the light-emitting side; the second reflecting layer comprises a plurality of reflecting sheets which are arranged at intervals, the reflecting sheets are arranged corresponding to the light-emitting elements, and the outer contours of the orthographic projections of the reflecting sheets on the substrate surround the orthographic projections of the corresponding light-emitting elements on the substrate.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of backlight display, and in particular relates to a light-emitting substrate, a display module and a display device. Background Art

[0002] Nowadays, Mini Light Emitting Diode (Mini LED) backlight technology, as a new technology in the field of backlight display, has achieved ultra-high contrast due to its ultra-thinness, high brightness, high color gamut, and regional dimming technology, greatly improving consumers' visual experience. It is currently rapidly penetrating into the display application field.

[0003] However, in order to achieve a wide-area luminous range, existing light-emitting substrates use a large number of Mini LEDs. On this basis, a large number of uniform light-emitting films are needed to achieve a uniform light output effect. This leads to generally high costs for existing backlight products, and the setting of multiple uniform light-emitting films increases the thickness of the product, which is not conducive to the realization of lightweight backlight products in the market. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provides a light-emitting substrate, a display module and a display device.

[0005] In a first aspect, a technical solution adopted to solve the technical problem of the present disclosure is a light-emitting substrate, comprising a substrate, a plurality of light-emitting elements arranged on the substrate, a first reflective layer arranged on the light-emitting element on a side away from the light-emitting side, a light guide plate and a second reflective layer arranged on the light-emitting element close to the light-emitting side; a surface of the light guide plate away from the light-emitting side is closer to the substrate than a surface of the second reflective layer away from the light-emitting side;

[0006] The second reflective layer includes a plurality of reflective sheets arranged at intervals, wherein the reflective sheets are arranged corresponding to the light emitting elements, and an outer contour of an orthographic projection of the reflective sheet on the substrate surrounds an orthographic projection of the corresponding light emitting element on the substrate.

[0007] In some embodiments, the second reflective layer is disposed on a surface of the light guide plate close to the light emitting side.

[0008] In some embodiments, the light guide plate has a plurality of first openings extending through the light guide plate along its thickness direction, the orthographic projection of the reflective sheet on the substrate covers the orthographic projection of the first openings on the substrate, and at least a portion of the light emitting element is located in the first opening;

[0009] The first opening is filled with an adhesive structure, and the adhesive structure surrounds at least a portion of the light emitting element located in the first opening.

[0010] In some embodiments, the reflective sheet is located in the first opening, and a surface of the reflective sheet close to the light emitting side is coplanar with a surface of the light guide plate close to the light emitting side.

[0011] In some embodiments, a surface of the light guide plate close to the light emitting side is provided with a plurality of dots;

[0012] The light-emitting substrate is divided into a plurality of light-emitting subareas, and one light-emitting element is disposed in each light-emitting subarea;

[0013] For any of the light-emitting subareas, the closer the arrangement density of the orthographic projection of the dots on the substrate is to the orthographic projection of the light-emitting element on the substrate, the sparser it is.

[0014] In some embodiments, for any of the light-emitting partitions, the size of the orthographic projection of the mesh dots on the substrate is smaller the closer it is to the orthographic projection of the light-emitting element on the substrate.

[0015] In some embodiments, the light-emitting subarea is divided into a first subarea, a second subarea and a third subarea which are nested in sequence, and the third subarea is farther away from the geometric center of the light-emitting subarea than the second subarea;

[0016] The total area of ​​the dots located in the first sub-division accounts for 15% to 25% of the total area of ​​the dots in the luminescent division; the total area of ​​the dots located in the second sub-division accounts for 25% to 45% of the total area of ​​the dots in the luminescent division; the total area of ​​the dots located in the third sub-division accounts for 45% to 55% of the total area of ​​the dots in the luminescent division; and the ratio of the total area of ​​the dots in the first sub-division, the total area of ​​the dots in the second sub-division, and the total area of ​​the dots in the third sub-division to the total area of ​​the dots in the luminescent division is 1.

[0017] In some embodiments, at least part of the reflector has multiple second openings extending through its thickness direction, and the multiple second openings are divided into at least one group of opening groups. The multiple second openings in each group of openings are arranged in a circular array with the geometric center of the reflector as the center.

[0018] In some embodiments, the plurality of second openings are divided into a first opening group, a second opening group, and a third opening group;

[0019] The first distance is from the center of the second opening in the first opening group to the geometric center of the reflector; the second distance is from the center of the second opening in the second opening group to the geometric center of the reflector; the third distance is from the center of the second opening in the third opening group to the geometric center of the reflector;

[0020] The ratio of the first distance to the maximum width from the geometric center of the reflector to its edge is in the range of 0.9 to 1.1; the ratio of the second distance to the maximum width from the geometric center of the reflector to its edge is in the range of 0.4 to 0.6; the ratio of the third distance to the maximum width from the geometric center of the reflector to its edge is in the range of 0.2 to 0.3.

[0021] In some embodiments, the edge of the reflector includes a plurality of arc segments and a first concave arc segment connected between two adjacent arc segments; the distance from any point in any arc segment to the geometric center of the reflector is equal;

[0022] One of the first concave arc segments defines a second opening in the first opening group.

[0023] In some embodiments, the second opening in the first opening group is semicircular in shape, and the second opening in the second opening group and the second opening in the third opening group are both circular in shape;

[0024] The diameter of the second openings in the first opening group is greater than the diameter of the second openings in the second opening group, and the diameter of the second openings in the second opening group is greater than the diameter of the second openings in the third opening group.

[0025] In some embodiments, the light-emitting substrate is divided into a plurality of light-emitting subareas, and one light-emitting element is disposed in each light-emitting subarea;

[0026] A virtual quadrilateral is constructed with the maximum distance in the length direction of the reflector sheet as the long side length and the maximum distance in the width direction of the reflector sheet as the wide side width; the length direction of the virtual quadrilateral is the same as the length direction of the reflector sheet, and the width direction of the virtual quadrilateral is the same as the width direction of the reflector sheet;

[0027] The virtual quadrilateral is a square; for any of the light-emitting partitions, one diagonal line in the virtual quadrilateral extends along the length direction of the light-emitting partition, and the other diagonal line extends along the width direction of the light guide plate.

[0028] In some embodiments, at least part of the reflective sheet has a plurality of third openings extending through its thickness direction, and the plurality of third openings are divided into at least one group of opening groups, and the plurality of third openings in each group of openings are arranged in a rectangular array with the geometric center of the reflective sheet as the center.

[0029] In some embodiments, the virtual quadrilateral is a square; the plurality of third openings are divided into a fourth opening group and a fifth opening group;

[0030] The centers of the second openings in the fourth opening group are connected in sequence to form a first closed square, and the centers of the second openings in the fourth opening group are connected in sequence to form a second closed square, and the side length of the first closed square is greater than the side length of the second closed square;

[0031] The ratio of the side length of the first closed square to the side length of the virtual quadrilateral is in the range of 0.85 to 1; the ratio of the side length of the second closed square to the side length of the virtual quadrilateral is in the range of 0.7 to 0.8.

[0032] In some embodiments, the edge of the reflective sheet includes a plurality of straight line segments and a second concave arc segment connected between two adjacent straight line segments;

[0033] One of the second concave arc segments defines a third opening in the fourth opening group.

[0034] In a second aspect, the embodiment of the present disclosure also includes a display module, including a light-emitting substrate as described in any one of the first aspects.

[0035] In a third aspect, an embodiment of the present disclosure further includes a display device, comprising the display module as described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic structural diagram of a light-emitting substrate provided in an embodiment of the present disclosure;

[0037] Figure 2 A schematic diagram of an exemplary arrangement of light-emitting elements provided in an embodiment of the present disclosure;

[0038] Figure 3 A top view of a second reflective layer provided in an embodiment of the present disclosure;

[0039] Figure 4 A schematic diagram of the structure of another light-emitting substrate provided in an embodiment of the present disclosure;

[0040] Figure 5 A schematic diagram of a network point arrangement provided in an embodiment of the present disclosure;

[0041] Figure 6 A schematic diagram of brightness distribution of a light-emitting substrate provided in an embodiment of the present disclosure;

[0042] Figure 7a A schematic diagram of a light-emitting substrate with an opening in a reflector provided in an embodiment of the present disclosure;

[0043] Figure 7b A schematic diagram of the structure of a circular reflector opening provided in an embodiment of the present disclosure;

[0044] Figure 8 for Figure 7a A schematic diagram of brightness distribution of the light-emitting substrate shown;

[0045] Fig. 9 A schematic diagram of another exemplary light-emitting substrate provided in an embodiment of the present disclosure;

[0046] Fig.10 A schematic diagram of another exemplary light-emitting substrate provided in an embodiment of the present disclosure;

[0047] Fig.11a A schematic diagram of a light-emitting substrate with an opening in a reflector provided in an embodiment of the present disclosure;

[0048] Fig.11b A schematic diagram of the structure of another circular reflector opening provided in an embodiment of the present disclosure;

[0049] Fig.12 is a schematic diagram of an existing display module;

[0050] Fig.13 A schematic diagram of an exemplary display module provided for an embodiment of the present disclosure.

[0051] The figures are marked as follows: 100, light-emitting substrate; 1, substrate; D, light-emitting element; 2, first reflective layer; 3, light guide plate; 31, first opening; 4, second reflective layer; 41, reflective sheet; 5, first adhesive layer; 6, second adhesive layer; 7, adhesive structure; 8, third adhesive layer; 9, grid points; 10, light-emitting partition; V1, second opening; 11, virtual quadrilateral; V2, third opening; 41a, circular arc segment; 41b, first concave arc segment; 41c, straight line segment; 41d, second concave arc segment. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the present disclosure for protection, but merely represents the selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present disclosure.

[0053] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] The "multiple or several" mentioned in this disclosure refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0055] In the related technology, in order to achieve a wide-area luminous range, the existing luminous substrate uses a large number of Mini LEDs. Taking the luminous substrate of a 16-inch notebook (Note Book, NB) as an example, 8,000 to 10,000 Mini LEDs are generally used, and a large number of uniform light films are required to achieve the effect of uniform light output. This leads to a generally high cost of products using Mini LED backlight technology, which creates resistance to the future large-scale application of Mini LED technology. In addition, even if the setting of multiple uniform light films is used to achieve uniform light output, the thickness of the backlight product is increased overall, which is not conducive to achieving the thinness of the backlight product.

[0056] In view of this, the embodiment of the present disclosure provides a light-emitting substrate, which adds a reflective sheet on the light-emitting side, and uses the reflective sheet to reflect most of the emitted light of the light-emitting element to the light guide plate, and transmits a small part of the light out, thereby weakening the front light emission of the light-emitting element. At the same time, most of the light will be reflected by the light guide plate to achieve uniform light emission and diffuse to a larger range. In this way, within the same illumination range, the spacing between the light-emitting elements is greatly increased, the amount of light-emitting elements per unit area is reduced, and the cost of the light-emitting substrate is reduced.

[0057] Figure 1 A schematic diagram of the structure of a light-emitting substrate provided in an embodiment of the present disclosure is shown in FIG. Figure 1As shown, the light-emitting substrate 100 includes: a substrate 1, a plurality of light-emitting elements D arranged on the substrate 1, a first reflective layer 2 arranged on the light-emitting element D on the side away from the light-emitting side, a light guide plate 3 and a second reflective layer 4 arranged on the light-emitting element D close to the light-emitting side; the surface of the light guide plate 3 facing away from the light-emitting side is closer to the substrate 1 than the surface of the second reflective layer 4 facing away from the light-emitting side.

[0058] like Figure 1 As shown, the substrate 1 can be made of any one of a flexible printed circuit (FPC), a printed circuit board (PCB), a BT resin substrate or a glass substrate 1. Exemplarily, the thickness of the substrate 1 ranges from 0.1 mm to 1 mm.

[0059] The light emitting element D is, for example, an independently emitting Mini LED, a white light chip scale package (CSP) lamp, or a packaged light emitting diode (PKG LED). Figure 2 An exemplary arrangement diagram of light-emitting elements provided in the embodiment of the present disclosure is shown in FIG. Figure 2 As shown, a plurality of light emitting elements D may be arranged in an array on the light emitting substrate 100 .

[0060] Exemplarily, when the substrate 1 is an FPC or a PCB, the light-emitting element D can be fixed on the substrate 1 and emit light using the circuit in the substrate 1. Another exemplary embodiment, when the substrate 1 is a glass substrate 1, the light-emitting element D can be fixed on the substrate 1 or on the first reflective layer 2, and connected to a driving circuit for driving its own light emission through vias or external wiring.

[0061] like Figure 1 As shown, the first reflective layer 2 is arranged on the side of the light emitting element D away from the light emitting side, and is used to reflect the light emitted by the light emitting element D to reduce the absorption of light by the surface of the substrate 1, thereby improving the light emission efficiency. Exemplarily, the material of the first reflective layer 2 can be a diffuse reflection layer material with high reflectivity, such as white oil, dry film, thinner polycarbonate (PC) or polyethylene glycol Terephthalate (PET). Exemplarily, the thickness of the first reflective layer 2 ranges from 0.03 mm to 0.1 mm.

[0062] For example, Figure 1As shown, the first reflective layer 2 can be fixed on the substrate 1 by a first adhesive layer 5. The material of the first adhesive layer 5 can be acrylic adhesive or the like. Exemplarily, the thickness of the first adhesive layer 5 ranges from 0.02 mm to 0.05 mm.

[0063] like Figure 1 As shown, the light guide plate 3 is arranged on the side of the light emitting element D away from the light emitting side, and is used to reflect and transmit the light emitted by the light emitting element D and the light reflected by the first reflective layer 2, so as to achieve uniform emission of light from the light emitting side. Exemplarily, the material of the light guide plate 3 can be any one of PC, polymethyl methacrylate (PMMA), polystyrene (PS) or thermoplastic polyurethane (TPU).

[0064] Exemplarily, the thickness of the light guide plate 3 is in the range of 0.075 mm to 0.6 mm. For example, the thickness of the light guide plate 3 is 0.075 mm. The present disclosure uses an ultra-thin light guide plate, which can reduce the thickness of the light-emitting substrate as a whole, and is conducive to achieving a thin and light backlight product.

[0065] For example, Figure 1 As shown, the light guide plate 3 can be fixed to the surface of the first reflective layer 2 away from the substrate 1 by the second adhesive layer 6. The material of the second adhesive layer 6 can be acrylic adhesive or other materials. Exemplarily, the thickness of the second adhesive layer 6 ranges from 0.02 mm to 0.05 mm.

[0066] like Figure 1 As shown, the surface of the light guide plate 3 facing away from the light exiting side is closer to the substrate 1 than the surface of the second reflective layer 4 facing away from the light exiting side. The present disclosure does not limit the upper and lower positional relationship between the surface of the light guide plate 3 close to the light exiting side and the surface of the second reflective layer 4 close to the light exiting side. Figure 1 As shown, the second reflective layer 4 can be arranged on the side of the light guide plate 3 facing away from the substrate 1, that is, the surface of the light guide plate 3 facing away from the light output side is closer to the substrate 1 than the surface of the second reflective layer 4 facing away from the light output side. In another example, the second reflective layer 4 can also be arranged inside the light guide plate 3, that is, the surface of the light guide plate 3 facing away from the light output side is farther away from the substrate 1 than the surface of the second reflective layer 4 facing away from the light output side.

[0067] Figure 3 A top view of the second reflective layer provided in the embodiment of the present disclosure, such as Figure 1 and Figure 3As shown, the second reflective layer 4 includes a plurality of reflective sheets 41 arranged at intervals. The reflective sheets 41 are arranged corresponding to the light emitting elements D, and the outer contour of the orthographic projection of the reflective sheet 41 on the substrate 1 surrounds the orthographic projection of the corresponding light emitting element D on the substrate 1 .

[0068] Exemplarily, the maximum width of the reflective sheet 41 is between 2 mm and 3 mm.

[0069] Exemplarily, the thickness of the reflective sheet 41 ranges from 0.05 mm to 0.2 mm. For example, the thickness of the reflective sheet 41 is 0.05 mm, 0.1 mm, 0.15 mm or 0.2 mm.

[0070] Exemplarily, the material of the reflective sheet 41 may be an ultra-thin reflective sheet 41 with a certain transmittance, such as PC or PET material. Exemplarily, the reflectance of the reflective sheet 41 is between 85% and 95%.

[0071] Exemplarily, the contour shape of the orthographic projection of the reflective sheet 41 on the substrate 1 may be, for example, a circle, a square, a rectangle, a rhombus, a regular hexagon, a regular octagon, and the like.

[0072] The light emitting substrate 100 provided in the embodiment of the present disclosure may be applied to a direct-type display module or an edge-type display module.

[0073] In the embodiment of the present disclosure, a reflective sheet 41 is added to the light-emitting side of the light-emitting element D, and the outer contour of the orthographic projection of the reflective sheet 41 on the substrate 1 surrounds the orthographic projection of the corresponding light-emitting element D on the substrate 1, so that the reflective sheet 41 can be used to reflect most of the emitted light of the light-emitting element D to the light guide plate 3, and transmit a small part of the light out, thereby weakening the front light emission of the light-emitting element D. In addition, since most of the light is reflected to the light guide plate 3 through the reflective sheet 41, compared with the case where the reflective sheet 41 is not provided, the present disclosure increases the amount of light that is fully reflected by the light guide plate 3, thereby increasing the optical path of the light through regional dimming, so that the light can be diffused to a larger range, so that within the same illumination range, the spacing between the light-emitting elements D can be greatly increased, and the amount of light-emitting elements D per unit area can be reduced, thereby reducing the cost of the light-emitting substrate 100.

[0074] In some embodiments, Figure 1 and Figure 3 As shown, the light guide plate 3 has a plurality of first openings 31 extending through the light guide plate 3 along its thickness direction, the orthographic projection of the reflective sheet 41 on the substrate 1 covers the orthographic projection of the first opening 31 on the substrate 1, and at least a portion of the light-emitting element D is located in the first opening 31; the first opening 31 is filled with an adhesive structure 7, and the adhesive structure 7 surrounds at least a portion of the light-emitting element D located in the first opening 31.

[0075] Exemplarily, the first opening 31 may be a circular opening, or an opening of other regular or irregular shapes. For ease of understanding, the disclosure below takes the first opening 31 as a circular opening as an example.

[0076] For example, the material of the bonding structure 7 is a transparent protective glue, which completely fills the first opening 31 to protect the light emitting element D. The transparent protective glue can be a relatively fluid organic silica gel with a self-leveling characteristic. Figure 1 As shown, the surface of the bonding structure 7 close to the light emitting side is coplanar with the surface of the light guide plate 3 close to the light emitting side.

[0077] Exemplarily, the diameter of the first opening 31 ranges from 1 mm to 3 mm. For example, the diameter of the first opening 31 is 2 mm.

[0078] Exemplarily, the center of the orthographic projection of the first opening 31 on the substrate 1 falls within the orthographic projection of the light emitting element D on the substrate 1 , which is beneficial for the filled adhesive structure 7 to protect the light emitting element D more stably.

[0079] In some embodiments, Figure 1 As shown, the second reflective layer 4 is arranged on the surface of the light guide plate 3 close to the light emitting side.

[0080] like Figure 1 As shown, the second reflective layer 4 is fixed to the surface of the light guide plate 3 near the light output side by a third adhesive layer. The material of the third adhesive layer can be acrylic adhesive or other materials. Exemplarily, the thickness of the third adhesive layer ranges from 0.02 mm to 0.05 mm.

[0081] by Figure 1 Taking the display substrate shown as an example, the light emitted by the light-emitting element D is first incident and refracted by the bonding structure 7. A part of the light directly enters the light guide plate 3, and passes through the second adhesive layer 6 to reach the surface of the first reflective layer 2 facing away from the substrate 1. At this time, the light at the critical angle of total reflection will be totally reflected and propagated in the light guide plate 3, and will be emitted through the mesh point 9; another part of the light will pass through the third adhesive layer 8 and enter the second reflective layer 4. Since the second reflective layer 4 has a certain transmittance, specifically, the transmittance of the second reflective layer 4 is between 5% and 15%, a small part of the light incident on the second reflective layer 4 will be transmitted from the light emitting side. At the same time, the main function of the second reflective layer 4 is to realize light reflection. The reflectivity of the second reflective layer 4 is between 85% and 95%. Therefore, most of the light incident on the second reflective layer 4 will be reflected back to the light guide plate 3 and the adhesive structure 7 through the third adhesive layer 8, wherein the light reflected back to the light guide plate 3 continues to undergo total reflection and refraction along the light path and is emitted through the mesh point 9; at the same time, the light reflected back to the adhesive structure 7 and the first reflective layer 2 repeats the above path until it is emitted.

[0082] This embodiment has high requirements on the precision of attaching the reflective sheet 41 , so the alignment accuracy and thickness consistency of the reflective sheet 41 are relatively good, so that the reflectivity of the reflective sheet 41 corresponding to each light-emitting element D is highly consistent, thereby ensuring uniform light brightness.

[0083] In some embodiments, Figure 4 A schematic diagram of the structure of another light-emitting substrate provided in an embodiment of the present disclosure. Figure 4 The structure shown is Figure 1 The difference between the structures shown is that the reflector 41 is arranged at a different position. Figure 4 As shown, the reflective sheet 41 is located in the first opening 31 , and the surface of the reflective sheet 41 close to the light emitting side is coplanar with the surface of the light guide plate 3 close to the light emitting side.

[0084] like Figure 4 As shown, the second reflective layer 4 is fixed to the surface of the bonding structure 7 close to the light emitting side through the third bonding layer.

[0085] In this embodiment, a reflective sheet 41 is disposed in the first opening 31. The process is relatively Figure 1 The process of manufacturing the reflective sheet 41 is relatively simple. For example, in this embodiment, the reflective sheet 41 does not need to be attached in a strictly aligned manner. Therefore, the attachment accuracy requirement for the reflective sheet 41 is relatively low, and the manufacturing efficiency is higher.

[0086] In some embodiments, Figure 5 A schematic diagram of the network point arrangement provided in the embodiment of the present disclosure, such as Figure 5 As shown, a plurality of dots 9 are arranged on the surface of the light guide plate 3 close to the light emitting side; the light-emitting substrate 100 is divided into a plurality of light-emitting partitions 10, and a light-emitting element D is arranged in one light-emitting partition 10; for any light-emitting partition 10, the arrangement density of the orthographic projection of the dots 9 on the substrate 1 is closer to the orthographic projection of the light-emitting element D on the substrate 1, and the sparser it is.

[0087] Here, the arrangement density can be understood as the ratio of the sum of the areas of all the dots 9 in the preset sub-division to the sum of the areas of all the dots 9 in the entire luminous partition 10. Among them, the area size of the preset sub-division can be divided according to actual needs. However, the positions of each preset sub-division need to satisfy a nested relationship. For example, N preset sub-divisions can be set, the i+1th preset sub-division is farther away from the center of the luminous partition 10 than the i-th preset sub-division, and the i+1th preset sub-division nests the i-th preset sub-division. The arrangement density of the dots 9 in the i+1th preset sub-division is greater than the arrangement density of the dots 9 in the i-th preset sub-division. i is less than or equal to N, and i is a positive integer. N is a positive integer greater than 1.

[0088] The light-emitting substrate 100 has a reflection area and a light-emitting area surrounding the reflection area, and the reflection area and the light-emitting area do not overlap. The reflection sheet 41 is located in the reflection area, and a plurality of dots 9 are located in the light-emitting area.

[0089] For example, Figure 1 or Figure 4 As shown, multiple dots 9 can form a film structure on one side, which is arranged on the surface of the light guide plate 3 near the light output side. The positions of the dots 9 can destroy the total reflection of the light guide plate 3 to transmit light, and the surface of the light guide plate 3 in the area other than the dots is totally reflected.

[0090] As another example, the mesh dots 9 may be grooves on the light guide plate 3 , and are also located on the surface of the light guide plate 3 close to the light emitting side.

[0091] Exemplarily, the contour shape of the orthographic projection of the dot 9 on the substrate 1 can be, for example, a circle. In one case, within the allowable error range, the size of the dot 9 at any position on the light guide plate 3 is the same. In another case, for any light-emitting partition 10, the size of the orthographic projection of the dot 9 on the substrate 1 is smaller as it is closer to the orthographic projection of the light-emitting element D on the substrate 1. Since the energy of the light in the light guide plate 3 is smaller as the optical path of the light increases, the arrangement density of the dot 9 is set in this embodiment, the closer to the light-emitting element D, the sparser, and the farther away from the light-emitting element D, the denser, and the size of the dot 9 is set, the closer to the light-emitting element D, the smaller, and the farther away from the light-emitting element D, so as to reduce the number of outgoing light rays close to the position of the light-emitting element D, and increase the number of outgoing light rays away from the position of the light-emitting element D, so that the light within the range of a single light-emitting partition 10 can be uniformly emitted. At the same time, due to the improvement of the uniform light emission effect, the amount of part of the uniform light film can be reduced, thereby further reducing the product cost, and at the same time, the overall thickness of the display module can be reduced to expand the product application. In addition, reducing the number of outgoing light rays near the position of the light emitting element D means increasing the amount of light totally reflected by the light guide plate 3 near the position of the light emitting element D. This allows the light path to be increased through the mesh dots 9, thereby increasing the light expansion range. Therefore, within the same illumination range, the spacing between the light emitting elements D can be greatly increased, reducing the amount of light emitting elements D per unit area, thereby reducing the cost of the light emitting substrate 100.

[0092] In some embodiments, Figure 5As shown, the luminous partition 10 is divided into a first sub-partition, a second sub-partition and a third sub-partition which are nested in sequence, and the third sub-partition is farther away from the geometric center of the luminous partition 10 than the second sub-partition; the total area of ​​the dots 9 located in the first sub-partition accounts for 15% to 25% of the total area of ​​the dots 9 in the luminous partition 10; the total area of ​​the dots 9 located in the second sub-partition accounts for 25% to 45% of the total area of ​​the dots 9 in the luminous partition 10; the total area of ​​the dots 9 located in the third sub-partition accounts for 45% to 55% of the total area of ​​the dots 9 in the luminous partition 10; and the ratio of the sum of the areas of the dots 9 in the first sub-partition, the areas of the dots 9 in the second sub-partition, and the areas of the dots 9 in the third sub-partition to the sum of the areas of the dots 9 in the luminous partition 10 is 1.

[0093] The arrangement density disclosed in the present invention is equal to the ratio of the total area of ​​the dots 9 in the first sub-area (or the second sub-area, or the third sub-area) to the total area of ​​the dots 9 in the luminous area 10 .

[0094] Exemplarily, the first sub-region is an area located in the light-emitting region 10 and within a range of 1 mm to 2 mm from the geometric center of the light-emitting region 10. The second sub-region is an area located in the light-emitting region 10 and within a range of 2 mm to 3 mm from the geometric center of the light-emitting region 10. The third sub-region is an area located in the light-emitting region 10 and within a range greater than 3 mm from the geometric center of the light-emitting region 10.

[0095] For example, the arrangement density of the dots 9 in the first sub-area is 20%, the arrangement density of the dots 9 in the second sub-area is 30%, and the arrangement density of the dots 9 in the third sub-area is 50%. Of course, the arrangement density of the dots 9 in the present disclosure can be adjusted according to the size of the spacing between adjacent light-emitting elements D and the difference in the light type of the light-emitting elements D, and the need for uniform light output needs to be met.

[0096] Figure 6 A schematic diagram of brightness distribution of a light-emitting substrate provided in an embodiment of the present disclosure is shown in FIG. Figure 6 As shown, a circular reflector 41 is used. For detailed description of other structures, please refer to the above embodiments and their combinations. It can be seen from the figure that points b and f are the brightness of the light-emitting side directly above the reflector 41 facing the light-emitting element D, points a and c, points e and g are the brightness of the inner side of the edge of two adjacent reflectors 41, and the curves of points c, d and e are the brightness distribution between two adjacent reflectors 41. Figure 6 As shown in the figure, for any reflector 41, the brightness distribution gradually decreases from the center position to the outside until the brightness reaches the lowest point on the inner side of the edge of the reflector 41. Since more light is emitted from the outer side of the edge of the reflector 41, the brightness rises instantly, and then through the dots 9 distributed on the light guide plate 3, the brightness of the middle area of ​​two adjacent reflectors 41 remains at a substantially same level (i.e., the brightness near point d), and the light is uniform.

[0097] Depend on Figure 6 It can be seen that the brightness at the edge of the reflector 41 (or the position close to the inner side of the edge), that is, the brightness of points a, c, e and g, and the brightness at the center of the reflector 41, that is, the brightness of points b and f, have a larger span, and the half-width of the waveform formed by points a, b and c is narrower.

[0098] In some embodiments, Figure 7a A schematic diagram of a light-emitting substrate with an opening in a reflector provided in an embodiment of the present disclosure, Figure 7b A schematic diagram of the structure of a circular reflector opening provided in an embodiment of the present disclosure is shown in FIG. Figure 7a and Figure 7b As shown, at least part of the reflector 41 has a plurality of second openings V1 running through the thickness direction thereof, and the plurality of second openings V1 are divided into at least one opening group, and the plurality of second openings V1 in each opening group are arranged in a circular array with the geometric center O of the reflector 41 as the center. Therefore, for any opening group, the distance between two adjacent second openings V1 is equal.

[0099] Exemplarily, any reflective sheet 41 has a plurality of second openings V1 extending through the thickness direction thereof.

[0100] Exemplarily, the outline shape of the second opening V1 may be, for example, a circle, a semicircle, a triangle, a square, a rectangle, an ellipse, a regular hexagon or a regular octagon, etc., which is not specifically limited in the present disclosure.

[0101] In this embodiment, a second opening V1 is provided on the reflective sheet 41, so that light is emitted through the second opening V1, thereby improving the light transmittance of the reflective sheet 41, thereby improving the brightness between points a to b, b to c, e to f, and f to g, that is, improving the minimum brightness of points a, c, e, and g, thereby reducing the span between the maximum brightness and the minimum brightness. Figure 6 The structure shown further improves the uniformity of light output.

[0102] The present disclosure may adjust the number of opening groups and the number of second openings V1 in each opening group according to actual brightness distribution, which is not specifically limited in the present disclosure.

[0103] In some embodiments, Figure 7bAs shown, multiple second openings V1 are divided into a first opening group 101, a second opening group 102 and a third opening group 103; the first distance is from the center of the second opening V1 in the first opening group 101 to the geometric center O of the reflector 41; the second distance is from the center of the second opening V1 in the second opening group 102 to the geometric center O of the reflector 41; the third distance is from the center of the second opening V1 in the third opening group 103 to the geometric center O of the reflector 41; the ratio of the first distance to the maximum width from the geometric center O of the reflector 41 to its edge is in the range of 0.9 to 1.1; the ratio of the second distance to the maximum width from the geometric center O of the reflector 41 to its edge is in the range of 0.4 to 0.6, and the ratio of the third distance to the maximum width from the geometric center O of the reflector 41 to its edge is in the range of 0.2 to 0.3.

[0104] like Figure 7b As shown, the first distance is greater than the second distance, and the second distance is greater than the third distance; that is, the second openings V1 arranged in a ring array in the first opening group 101 are located in the outermost circle, and the second openings V1 arranged in a ring array in the second opening group 102 are nested; the second openings V1 arranged in a ring array in the second opening group 102 are nested in the second openings V1 arranged in a ring array in the third opening group 103.

[0105] For example, Figure 7b As shown, taking the width of the reflector 41 as 3 mm as an example, the first opening group 101 includes 16 second openings V1 arranged in a circular array. The second opening group 102 includes 12 second openings V1 arranged in a circular array. The first opening group 101 includes 8 second openings V1 arranged in a circular array.

[0106] Exemplarily, the first distance is equal to the maximum width from the geometric center O of the reflector 41 to its edge. The ratio of the second distance to the maximum width from the geometric center O of the reflector 41 to its edge is 0.5. The ratio of the third distance to the maximum width from the geometric center O of the reflector 41 to its edge is 0.25.

[0107] For example, Figure 7b As shown, the center lines of the second openings V1 arranged in a circular array in the first opening group 101 form a circular ring with a diameter of φz; the center lines of the second openings V1 arranged in a circular array in the second opening group 102 form a circular ring with a diameter of φy; the center lines of the second openings V1 arranged in a circular array in the third opening group 103 form a circular ring with a diameter of φx. Exemplarily, φx:φy:φz=0.25:0.5:1.

[0108] In some embodiments, Figure 7bAs shown, the edge of the reflector 41 includes multiple arc segments 41a and a first concave arc segment 41b connected between two adjacent arc segments 41a; the distance from any point in any arc segment 41a to the geometric center O of the reflector 41 is equal; a first concave arc segment 41b defines a second opening V1 in the first opening group 101. In other words, the second opening V1 in the first opening group 101 is a concave opening, located at the edge of the reflector 41, which can improve the brightness of the edge of the reflector 41, thereby reducing the span between the highest brightness at the center of the reflector 41 and the lowest brightness at the edge, and reducing the brightness difference between the inner edge and the outer edge of the reflector 41, achieving a uniform transition, and then improving the uniformity of light output. At the same time, the improvement of the uniformity of light output can save a certain number of uniform light films, save costs, and reduce the requirements for the uniform light specifications of the uniform light films, thereby improving the manufacturing efficiency.

[0109] In some embodiments, Figure 7b As shown, the shape of the second opening V1 in the first opening group 101 is semicircular, the shape of the second opening V1 in the second opening group 102 and the shape of the second opening V1 in the third opening group 103 are both circular; the diameter of the second opening V1 in the first opening group 101 is greater than the diameter of the second opening V1 in the second opening group 102, and the diameter of the second opening V1 in the second opening group 102 is greater than the diameter of the second opening V1 in the third opening group 103.

[0110] For example, Figure 7b As shown, the shape of the second opening V1 in the first opening group 101 is semicircular, and the diameter of the semicircular second opening V1 is between 0.325mm and 0.4mm; the diameter of the second opening V1 in the second opening group 102 is between 0.275mm and 0.325mm; the diameter of the second opening V1 in the first opening group 101 is between 0.2mm and 0.275mm. For example, the diameter of the semicircular second opening V1 is 0.35mm; the diameter of the second opening V1 in the second opening group 102 is 0.3; the diameter of the second opening V1 in the third opening group 103 is 0.25.

[0111] Depend on Figure 6 It can be seen from the brightness distribution curve that the geometric center O of the reflector 41 has the highest brightness, so most of the second openings V1 are distributed near the edge of the reflector 41, and the closer the second openings V1 are to the edge, the larger the diameter is, so as to increase the light output brightness at the edge of the reflector 41, thereby reducing the difference between the highest brightness and the lowest brightness of the reflector 41, so as to achieve a uniform light output effect.

[0112] Figure 8 for Figure 7a The schematic diagram of brightness distribution of the light-emitting substrate shown in FIG. Figure 8 As shown, compared Figure 6 In the circular reflector 41 shown, the brightness of point B is the same as that of point b; the brightness of point F is the same as that of point f; and the brightness of point D is the same as that of point d. However, Figure 7a The structure can improve the brightness of points A, C, E and G on the inner side of the edge of the reflector 41, so that the brightness difference between point B and point A or C is relatively Figure 6 At the same time, the half-height widths of the brightness distribution curves ABC and EFG are increased, thereby improving the brightness uniformity of the reflector 41, thereby reducing the requirements of the light-emitting substrate 100 for the light-homogenizing film, reducing the amount of the light-homogenizing film used, and reducing the light-homogenizing specification requirements for the light-homogenizing film.

[0113] In some embodiments, Fig. 9 A schematic diagram of another exemplary light-emitting substrate provided in an embodiment of the present disclosure, compared to Figure 3 The circular reflector 41 shown in FIG. Fig. 9 As shown, it is a light-emitting substrate 100 with a square reflector 41, the light-emitting substrate 100 is divided into a plurality of light-emitting partitions 10, and one light-emitting element D is arranged in one light-emitting partition 10; a virtual quadrilateral 11 is constructed with the maximum length of the reflector 41 as the long side length, and the maximum width of the reflector 41 as the wide side width; the length direction of the virtual quadrilateral 11 is the same as the length direction of the reflector 41, and the width direction of the virtual quadrilateral 11 is the same as the width direction of the reflector 41; the virtual quadrilateral 11 is a square; for any light-emitting partition 10, a diagonal line 11a in the virtual quadrilateral 11 coincides with a diagonal line 10a of the light-emitting partition 10, and another diagonal line 11b in the virtual quadrilateral 11 coincides with another diagonal line 10b of the light-emitting partition 10.

[0114] In some embodiments, Fig.10 A schematic diagram of another exemplary light-emitting substrate provided in an embodiment of the present disclosure, compared to Figure 3 The circular reflector 41 shown in FIG. Fig.10 As shown, it is a light-emitting substrate 100 with a square reflective sheet 41, the light-emitting substrate 100 is divided into a plurality of light-emitting partitions 10, and one light-emitting element D is arranged in one light-emitting partition 10; a virtual quadrilateral 11 is constructed with the maximum length of the reflective sheet 41 as the long side length, and the maximum width of the reflective sheet 41 as the wide side width; the length direction of the virtual quadrilateral 11 is the same as the length direction of the reflective sheet 41, and the width direction of the virtual quadrilateral 11 is the same as the width direction of the reflective sheet 41; the virtual quadrilateral 11 is a square; for any light-emitting partition 10, a diagonal line 11a in the virtual quadrilateral 11 extends along the length direction of the light-emitting partition 10, and another diagonal line 11b extends along the width direction of the light guide plate 3.

[0115] For example, Fig.10As shown, the virtual quadrilateral 11 is a square; for any luminous subarea 10, the intersection of the diagonals 10a and 10b of the luminous subarea 10 is the same as the intersection of the diagonals 11a and 11b of the virtual quadrilateral 11, and the angle between any diagonal 11a or 11b of the virtual quadrilateral 11 and any diagonal 10a or 10b of the luminous subarea 10 is 45°. For example, the angle α between the diagonal 11b and the diagonal 10b is 45°. It should be noted that the angle in the present disclosure refers to the acute angle between two diagonals.

[0116] Exemplarily, the outline of the reflective sheet 41 is a square, and the outline of the virtual quadrilateral 11 coincides with the outline of the reflective sheet 41 .

[0117] In this embodiment, the reflector 41 is attached to the light-emitting subarea 10 at a 45° angle. Fig. 9 With the attachment method shown, the distance from the light-emitting element D to the side of the reflective sheet 41 in the diagonal direction of the light-emitting partition 10 is shortened. According to the inverse square law, the light output in the diagonal direction of the reflective sheet 41 can be increased, thereby solving the problem of slightly low brightness in the four corners of a single light-emitting partition 10.

[0118] In some embodiments, Fig.11a A schematic diagram of a light-emitting substrate 100 with a reflector opening provided in an embodiment of the present disclosure, Fig.11b A schematic diagram of the structure of another circular reflector opening provided in an embodiment of the present disclosure,

[0119] like Fig.11a and Fig.11b As shown, at least part of the reflector 41 has a plurality of third openings V2 running through the thickness direction thereof, and the plurality of third openings V2 are divided into at least one opening group, and the plurality of third openings V2 in each opening group are arranged in a rectangular array with the geometric center O of the reflector 41 as the center. Therefore, for any opening group, the distance between two adjacent third openings V2 is equal.

[0120] Exemplarily, any reflective sheet 41 has a plurality of third openings V2 extending through the thickness direction thereof.

[0121] Exemplarily, the outline shape of the third opening V2 may be, for example, a circle, a semicircle, a triangle, a square, a rectangle, an ellipse, a regular hexagon or a regular octagon, etc., which is not specifically limited in the present disclosure.

[0122] In this embodiment, a third opening V2 is provided on the reflector 41, so that light is emitted through the third opening V2, thereby increasing the light transmittance of the reflector 41, thereby reducing the difference between the lowest brightness at the edge of the reflector 41 and the highest brightness at the center. Figure 6 The structure shown further improves the uniformity of light output.

[0123] The present disclosure may adjust the number of opening groups and the number of third openings V2 in each opening group according to actual brightness distribution, which is not specifically limited in the present disclosure.

[0124] In some embodiments, Fig.11b As shown, the virtual quadrilateral 11 is a square; a plurality of third openings V2 are divided into a fourth opening group 104 and a fifth opening group 105; the centers of the second openings V1 in the fourth opening group 104 are sequentially connected to form a first closed square, and the centers of the second openings V1 in the fourth opening group 104 are sequentially connected to form a second closed square, and the side length M of the first closed square is greater than the side length N of the second closed square; the ratio of the side length M of the first closed square to the side length of the virtual quadrilateral 11 is in the range of 0.85 to 1; the ratio of the side length N of the second closed square to the side length of the virtual quadrilateral 11 is in the range of 0.7 to 0.8.

[0125] For example, Fig.11b As shown, taking the width of the reflective sheet 41 as 3 mm as an example, the fourth opening group 104 includes 24 third openings V2 arranged in a rectangular array. The fifth opening group 105 includes 16 third openings V2 arranged in a rectangular array.

[0126] Exemplarily, the side length M of the first closed square is equal to the side length of the virtual quadrilateral 11. The ratio between the side length N of the second closed square and the side length of the virtual quadrilateral 11 is 0.75.

[0127] Exemplarily, the shape of the third opening V2 in the fourth opening group 104 is semicircular, and the diameter of the semicircular third opening V2 is between 0.15 mm and 0.25 mm; the shape of the third opening V2 in the fifth opening group 105 is circular, and the diameter of the third opening V2 in the fifth opening group 105 is between 0.15 mm and 0.25 mm. Exemplarily, the diameter of the semicircular third opening V2 is 0.2 mm. The diameter of the third opening V2 in the fifth opening group 105 is 0.2 mm.

[0128] It should be noted that the opening size and number of the reflective sheet 41 of the present disclosure are not limited to the specific values ​​mentioned in the present disclosure, and any structure similar to the present disclosure should be within the protection scope of the present disclosure.

[0129] In some embodiments, Fig.11bAs shown, the edge of the reflector 41 includes a plurality of straight line segments 41c and a second concave arc segment 41d connected between two adjacent straight line segments 41c; a second concave arc segment 41d defines a third opening V2 in the fourth opening group 104. In other words, the third opening V2 in the fourth opening group 104 is a concave opening, located at the edge of the reflector 41, which can improve the brightness of the edge of the reflector 41, thereby reducing the span between the highest brightness at the center of the reflector 41 and the lowest brightness at the edge, and reducing the brightness difference between the inner edge and the outer edge of the reflector 41, achieving a uniform transition, and then improving the uniformity of light output. At the same time, the improvement of the uniformity of light output can save a certain amount of uniform light films, save costs, and reduce the requirements for the uniform light specifications of the uniform light films, thereby improving the manufacturing efficiency.

[0130] In some embodiments, when the substrate 1 is an FPC or a PCB, the light emitting element D can be fixed on the substrate 1. Specifically, the first reflective layer 2 has a plurality of windows extending through the thickness direction thereof, the windows are arranged in one-to-one correspondence with the light emitting elements D, and the light emitting element D is fixed on the surface of the substrate 1 on the light emitting side through the windows.

[0131] Exemplarily, the size of the window is smaller than the size of the first opening 31. For example, the size of the window is 0.23 mm×0.61 mm.

[0132] Exemplarily, the first opening 31 not only penetrates the light guide plate 3, but also penetrates the second adhesive layer 6. The adhesive structure 7 fills the first opening 31 and flows into the window on the first reflective layer 2, surrounding the light emitting element D to protect the light emitting element D.

[0133] The length and width of the light-emitting substrate 100 disclosed in the present invention are approximately equal, and the absolute value of the difference between the length and width is less than 0.1 mm.

[0134] In some embodiments, the light-emitting substrate provided by the present disclosure can be prepared using the following process flow: solder paste printing → solder paste inspection (Solder Paste Inspection, SPI) → die bonding → Automatic Optical Inspection (Automatically Optical Inspection, AOI) → first adhesive layer 5 attachment → substrate 1 surface reflector 4 attachment (white oil or dry film is completed in the substrate factory) → second adhesive layer 6 attachment → formation of light guide plate 3 → application of protective glue (that is, adhesive structure 7) → standing self-leveling → pre-curing → third adhesive layer 8 attachment → reflector 41 attachment → AOI.

[0135] The above is a complete description of the light-emitting substrate provided in the embodiment of the present disclosure. The structure of the light-emitting substrate provided in the present disclosure can evenly diffuse the light of a single light-emitting element D to a larger range, which greatly increases the pitch between the light-emitting elements D within the same illumination range, and greatly reduces the amount of light-emitting elements D per unit area. Taking a 16-inch NB light-emitting substrate as an example, 1000 to 2000 Mini LEDs can be reduced, reducing the cost of the light-emitting substrate. At the same time, the opening design of the reflective sheet 41 and the arrangement design of the dots 9 can control the backlight halo within a reasonable range and greatly improve the uniform light effect, so the amount of part of the uniform light film can be reduced, further reducing the cost of the light-emitting substrate 100. In addition, the present disclosure adopts an ultra-thin light guide plate 3, combined with a thinned uniform light film, which can reduce the overall thickness of the light-emitting substrate 100, realize the lightweight product, and expand the product application.

[0136] Based on the same inventive concept above, an embodiment of the present disclosure further provides a display module, which includes the light-emitting substrate in each of the above embodiments.

[0137] In some embodiments, the display module further includes an optical film set.

[0138] Fig.12 is a schematic diagram of an existing display module, such as Fig.12 As shown, the display module includes a first adhesive tape 011, a second adhesive tape 012, a third adhesive tape 013, a fourth adhesive tape 014, a back plate 02, a rubber frame 03, a substrate 04, an LED, a protective adhesive 05, a lower diffusion film 06, a BLE film 07, a color conversion film 08, a first layer of uniform light film 091, a second layer of uniform light film 092, a third layer of uniform light film 093, an incremental film 010, an upper diffusion film 011, a lower polarizer 012, a display screen 013 and an upper polarizer 014. The display module composed of the light-emitting substrate of the prior art uses a large number of Mini LEDs and a large number of uniform light films, has a high overall cost, and has a thick display module.

[0139] Fig.13 A schematic diagram of an exemplary display module provided in an embodiment of the present disclosure is shown in FIG. Fig.13As shown, the display module includes a first adhesive tape 201, a back plate 202, an adhesive frame 203, a light-emitting substrate 100 and an optical film group 300; the optical film group 300 includes a first light-homogenizing film 204, a BLE film 205, a color conversion film 206, a second light-homogenizing film 207, an incremental film 208, an upper diffusion film 208, a lower polarizer 2010, a display screen 2011, an upper polarizer 2012, a second adhesive tape 2013, a third adhesive tape 2014 and a fourth adhesive tape 2015. The display module composed of the light-emitting substrate 100 and the optical film group 300 disclosed in the present invention uses a small number of Mini LEDs and a small number of light-homogenizing films, so that the overall cost of the display module is reduced and the thickness of the display module is reduced.

[0140] It should be noted that other essential components of the display module should be understood by those skilled in the art and will not be elaborated herein and should not be construed as limiting the present disclosure.

[0141] In addition, an embodiment of the present disclosure further provides a display device, comprising the above-mentioned display module.

[0142] The above-mentioned display device can be: electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, vehicle-mounted equipment, navigation system and any other product or component with display function. The other essential components of the display device should be understood by ordinary technicians in this field and will not be elaborated here, nor should they be used as limitations on the present disclosure.

[0143] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A light-emitting substrate, characterized in that: The invention comprises a substrate, a plurality of light-emitting elements arranged on the substrate, a first reflective layer arranged on the light-emitting element at a side away from the light-emitting side, a light guide plate and a second reflective layer arranged on the light-emitting element near the light-emitting side; the surface of the light guide plate away from the light-emitting side is closer to the substrate than the surface of the second reflective layer away from the light-emitting side; The second reflective layer includes a plurality of reflective sheets arranged at intervals, wherein the reflective sheets are arranged corresponding to the light emitting elements, and an outer contour of an orthographic projection of the reflective sheet on the substrate surrounds an orthographic projection of the corresponding light emitting element on the substrate.

2. The light-emitting substrate according to claim 1, characterized in that: The second reflective layer is arranged on a surface of the light guide plate close to the light emitting side.

3. The light-emitting substrate according to claim 1, characterized in that: The light guide plate has a plurality of first openings extending through the light guide plate in a thickness direction thereof, the orthographic projection of the reflective sheet on the substrate covers the orthographic projection of the first openings on the substrate, and at least a portion of the light emitting element is located in the first opening; The first opening is filled with an adhesive structure, and the adhesive structure surrounds at least a portion of the light emitting element located in the first opening.

4. The light-emitting substrate according to claim 3, characterized in that: The reflective sheet is located in the first opening, and a surface of the reflective sheet close to the light-emitting side is coplanar with a surface of the light guide plate close to the light-emitting side.

5. The light-emitting substrate according to claim 1, characterized in that: The surface of the light guide plate close to the light output side is provided with a plurality of dots; The light-emitting substrate is divided into a plurality of light-emitting subareas, and one light-emitting element is disposed in each light-emitting subarea; For any of the light-emitting subareas, the closer the arrangement density of the orthographic projection of the dots on the substrate is to the orthographic projection of the light-emitting element on the substrate, the sparser it is.

6. The light-emitting substrate according to claim 5, characterized in that: For any of the light-emitting subareas, the size of the orthographic projection of the dots on the substrate is smaller the closer it is to the orthographic projection of the light-emitting element on the substrate.

7. The light-emitting substrate according to claim 5, characterized in that: The light-emitting subarea is divided into a first subarea, a second subarea and a third subarea which are nested in sequence, and the third subarea is farther away from the geometric center of the light-emitting subarea than the second subarea; The total area of ​​the dots located in the first sub-division accounts for 15% to 25% of the total area of ​​the dots in the luminescent division; the total area of ​​the dots located in the second sub-division accounts for 25% to 45% of the total area of ​​the dots in the luminescent division; the total area of ​​the dots located in the third sub-division accounts for 45% to 55% of the total area of ​​the dots in the luminescent division; and the ratio of the total area of ​​the dots in the first sub-division, the total area of ​​the dots in the second sub-division, and the total area of ​​the dots in the third sub-division to the total area of ​​the dots in the luminescent division is 1.

8. The light emitting substrate according to any one of claims 1 to 5, characterized in that At least part of the reflector has a plurality of second openings extending through the thickness direction thereof, the plurality of second openings are divided into at least one opening group, and the plurality of second openings in each opening group are arranged in a circular array with the geometric center of the reflector as the center.

9. The light-emitting substrate according to claim 8, characterized in that: The plurality of second openings are divided into a first opening group, a second opening group and a third opening group; A first distance is between the center of the second opening in the first opening group and the geometric center of the reflector; A second distance is from the center of the second opening in the second opening group to the geometric center of the reflector; a third distance is from the center of the second opening in the third opening group to the geometric center of the reflector; The ratio of the first distance to the maximum width from the geometric center of the reflector to its edge is in the range of 0.9 to 1.1; the ratio of the second distance to the maximum width from the geometric center of the reflector to its edge is in the range of 0.4 to 0.6; the ratio of the third distance to the maximum width from the geometric center of the reflector to its edge is in the range of 0.2 to 0.

3.

10. The light emitting substrate according to claim 9, characterized in that: The edge of the reflective sheet includes a plurality of arc segments and a first concave arc segment connected between two adjacent arc segments; The distance from any point in any arc segment to the geometric center of the reflector is equal; One of the first concave arc segments defines a second opening in the first opening group.

11. The light emitting substrate according to claim 10, characterized in that: The second opening in the first opening group is semicircular in shape, and the second opening in the second opening group and the second opening in the third opening group are both circular in shape; The diameter of the second openings in the first opening group is greater than the diameter of the second openings in the second opening group, and the diameter of the second openings in the second opening group is greater than the diameter of the second openings in the third opening group.

12. The light emitting substrate according to any one of claims 1 to 5, characterized in that The light-emitting substrate is divided into a plurality of light-emitting subareas, and one light-emitting element is disposed in each light-emitting subarea; A virtual quadrilateral is constructed with the maximum distance in the length direction of the reflector sheet as the long side length and the maximum distance in the width direction of the reflector sheet as the wide side width; the length direction of the virtual quadrilateral is the same as the length direction of the reflector sheet, and the width direction of the virtual quadrilateral is the same as the width direction of the reflector sheet; The virtual quadrilateral is a square; for any of the light-emitting partitions, one diagonal line in the virtual quadrilateral extends along the length direction of the light-emitting partition, and the other diagonal line extends along the width direction of the light guide plate.

13. The light emitting substrate according to claim 12, characterized in that: At least part of the reflection sheet has a plurality of third openings extending through the thickness direction thereof, the plurality of third openings are divided into at least one opening group, and the plurality of third openings in each opening group are arranged in a rectangular array with the geometric center of the reflection sheet as the center.

14. The light emitting substrate according to claim 13, characterized in that: The virtual quadrilateral is a square; the plurality of third openings are divided into a fourth opening group and a fifth opening group; The centers of the second openings in the fourth opening group are connected in sequence to form a first closed square, and the centers of the second openings in the fourth opening group are connected in sequence to form a second closed square, and the side length of the first closed square is greater than the side length of the second closed square; The ratio of the side length of the first closed square to the side length of the virtual quadrilateral is in the range of 0.85 to 1; the ratio of the side length of the second closed square to the side length of the virtual quadrilateral is in the range of 0.7 to 0.

8.

15. The light emitting substrate according to claim 14, characterized in that: The edge of the reflective sheet includes a plurality of straight line segments and a second concave arc segment connected between two adjacent straight line segments; One of the second concave arc segments defines a third opening in the fourth opening group.

16. A display module, characterized in that: The light-emitting substrate comprises the light-emitting substrate according to any one of claims 1 to 15.

17. A display device, characterized in that: Comprising the display module as claimed in claim 16.

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