Light-emitting element, method for preparing light-emitting element, and display device

Abstract

The present invention provides a light-emitting element, a method for manufacturing a light-emitting element, and a display device, addressing the problem of haloing around MiniLED chips, which affects visual effects. One embodiment of the present invention provides a light-emitting element comprising: a substrate; a light-emitting unit disposed on one side of the substrate; and a dimming unit disposed on a side of the light-emitting unit away from the substrate. The dimming unit comprises a convex lens and a plurality of raised structures surrounding the convex lens, with the convex lens protruding toward the side of the light-emitting unit. The dimming unit is configured to adjust the light emitted by the light-emitting unit into collimated light.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a light-emitting element, a method for preparing the light-emitting element, and a display device. Background Art

[0002] As products using MiniLED technology continue to launch, they are primarily contributing to upgrades in LCD (Liquid Crystal Display) and fine-pitch LED (Light Emitting Diode) backlighting and self-illumination, respectively. With industry standards gradually being formulated and strong demand in the end-market, the MiniLED industry is expected to see rapid growth. However, due to the short light mixing distance, when a small number of chips are excited to emit light, a halo will form around the chip, affecting visual quality. Summary of the Invention

[0003] In view of this, the present invention provides a light-emitting element, a method for preparing a light-emitting element, and a display device, which solve the problem of halo appearing around the MiniLED chip, affecting the visual effect.

[0004] An embodiment of the present invention provides a light-emitting element comprising:

[0005] A substrate; a light-emitting unit arranged on one side of the substrate; a dimming unit arranged on a side of the light-emitting unit away from the substrate, the dimming unit comprising a convex lens and a plurality of convex structures surrounding the convex lens, and the convex direction of the convex lens is close to the side of the light-emitting unit, and the dimming unit is used to adjust the light emitted by the light-emitting unit into collimated light.

[0006] In one embodiment, the substrate, the light emitting unit and the dimming unit form a sealed whole, wherein the light emitting unit and the dimming unit are arranged at a certain distance from each other.

[0007] In one embodiment, the orthographic projection of the dimming unit on the substrate covers the orthographic projection of the light-emitting unit on the substrate.

[0008] In one embodiment, the plurality of protruding structures are distributed in a zigzag shape.

[0009] In one embodiment, the dimming unit is made of a mixture of polymethyl methacrylate and acrylic adhesive, or a mixture of polycarbonate and acrylic adhesive.

[0010] In one embodiment, the convex lens has a power of 55° to 80°.

[0011] In one embodiment, in a direction perpendicular to the plane where the substrate is located, the shortest distance between the convex lens and the light-emitting unit is between 0.1 mm and 0.3 mm.

[0012] In one embodiment, the longest distance between the convex lens and the light-emitting unit is between 0.2 mm and 0.4 mm.

[0013] In one embodiment, the raised structure includes a first portion and a second portion arranged on a side of the first portion close to the light-emitting element, wherein the cross-section of the first portion along the light-emitting direction of the light-emitting unit is rectangular; the cross-section of the second portion along the light-emitting direction of the light-emitting unit is triangular, and the internal angle of the triangle close to the light-emitting unit is 10° to 90°.

[0014] In one embodiment, in a direction parallel to the plane where the substrate is located, the side length of the triangle is 0.01 mm to 0.1 mm.

[0015] A method for preparing a light-emitting element, comprising:

[0016] providing a substrate;

[0017] forming a light emitting unit on one side of the substrate;

[0018] A dimming unit is formed on the side of the light-emitting unit away from the substrate. The dimming unit includes a convex lens and a plurality of convex structures surrounding the convex lens. The convex direction of the convex lens is close to the side of the light-emitting unit. The dimming unit is used to adjust the light emitted by the light-emitting unit into collimated light.

[0019] In one embodiment, the step of forming a dimming unit on a side of the light-emitting unit away from the substrate includes:

[0020] attaching a mold to the substrate, and injecting polymethyl methacrylate or polycarbonate into the mold;

[0021] An acrylic adhesive is injected into the mold to form the dimming unit, wherein the acrylic adhesive seals the substrate, the light emitting unit, and the dimming unit into a whole.

[0022] A display device comprises any one of the light-emitting elements described above.

[0023] A light-emitting element provided by an embodiment of the present invention adds a dimming unit to a conventional light-emitting element, wherein the dimming unit includes a convex lens and multiple raised structures surrounding the convex lens; the convex lens can focus the small-angle light emitted by the light-emitting unit of the light-emitting element; the multiple raised structures can refract and focus the large-angle light emitted by the light-emitting unit to the display area, thereby effectively preventing invalid light paths from entering the non-display area and causing halo, thereby improving the realistic effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure shows a schematic diagram of the dispersion of light emitted by a light-emitting element in the prior art.

[0025] Figure 2 FIG. 1 is a schematic structural diagram of a light-emitting element according to an embodiment of the present invention.

[0026] Figure 3 FIG. 1 is a schematic structural diagram of a light emitting element according to another embodiment of the present invention.

[0027] Figure 4 FIG2 is a schematic diagram showing the focusing of light emitted by a light-emitting element according to an embodiment of the present invention.

[0028] Figure 5a FIG. 1 is a schematic diagram of the distribution of light-emitting units according to an embodiment of the present invention.

[0029] Figure 5b FIG. 1 is a schematic diagram showing a distribution of multiple dimming units according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] Under the current miniled structure design, such as Figure 1As shown, the LED chip has a light-emitting angle of more than 120 degrees, and the light path does not change when passing through the various layers of the MiniLED film. This results in about 50% of the effective light entering the panel area and being used for display, but the remaining 50% of the light is ineffective when using HDR (High-Dynamic Range). This part of the light will form a halo area outside the light-emitting area. To solve the above problem, this case adds an optical structure to the conventional LED structure to prevent the invalid light path from entering the non-display area and causing halo. The details are described in the following embodiments.

[0032] This embodiment provides a light emitting element, such as Figure 2 As shown, it includes: a substrate 10, a light-emitting unit 20 and a dimming unit 30. The light-emitting unit 20 is arranged on one side of the substrate 10, and the dimming unit 30 is arranged on the side of the light-emitting unit 20 away from the substrate 10. The substrate 10 can support the light-emitting unit 20; the light-emitting unit 20 emits display light to realize the display function; the dimming unit 30 includes a convex lens 31, and a plurality of protruding structures 32 surrounding the convex lens 31. Since the dimming unit 30 is arranged on the side of the light-emitting unit 20 away from the substrate 10, it is arranged opposite to the light-emitting unit 20, and the protruding direction of the convex lens 31 is close to the side of the light-emitting unit, the dimming unit is used to adjust the light emitted by the light-emitting unit to collimated light, such as Figure 3 As shown, after the light of various angles emitted by the light-emitting unit 20 enters the dimming unit 30, it can be refracted and focused by the convex lens 31 and the protruding structure 32 and can be transformed into collimated light or nearly collimated light. The convex lens 31 can focus the small-angle display light emitted by the light-emitting unit 20; the multiple protruding structures 32 can refract and focus the large-angle display light emitted by the light-emitting unit 20, thereby effectively focusing the light of various angles emitted by the light-emitting unit to the target display area, avoiding invalid light paths from entering the non-display area to cause halo, thereby improving the display effect.

[0033] In one embodiment of the present invention, a thin film encapsulation layer is further provided on the side of the dimming unit 30 away from the light emitting unit 20. The thin film encapsulation layer can protect the light emitting unit 20 and the dimming unit 30, preventing moisture and oxygen in the air from entering and affecting the lighting effect.

[0034] In one embodiment of the present invention, the substrate 10, the light-emitting unit 20, and the dimming unit 30 form a sealed whole, wherein a certain distance is separated between the light-emitting unit 20 and the dimming unit 30, and an air layer may be included between the distance. Forming the substrate 10, the light-emitting unit 20, and the dimming unit 30 into a sealed whole prevents light from diverging, thereby improving the utilization rate of effective light. Furthermore, the provision of the air layer facilitates mixing of light from various angles emitted by the light-emitting unit, thereby improving display uniformity.

[0035] In one embodiment of the present invention, the orthographic projection of the dimming unit 30 on the substrate 10 overlaps the orthographic projection of the light-emitting unit 20 on the substrate 10, thereby ensuring that light from all angles emitted by the light-emitting unit 20 can be converged by the convex lens 31 and the protruding structure 32, thereby improving light utilization. Preferably, the center of the convex lens 31 in the dimming unit 30 is aligned with the center position of the light-emitting unit.

[0036] In one embodiment of the present invention, the convex curvature of the convex lens 31 ( Figure 4 (replaced by A in the figure) is 55° to 80°. Preferably, the convex curvature of the convex lens 31 ( Figure 4 The temperature is 72 degrees.

[0037] In one embodiment of the present invention, in a direction perpendicular to the plane of the substrate, the shortest distance between the convex lens 31 and the light emitting unit 20 is ( Figure 4 (replaced by D in the figure) is between 0.1 mm and 0.3 mm. Preferably, the shortest distance between the convex lens 31 and the light emitting unit 20 ( Figure 4 (replaced by D in the figure) is 0.12mm.

[0038] In one embodiment of the present invention, the thickness of the protrusion of the convex lens is ( Figure 4 (replaced by E in the figure) is between 0.2 mm and 0.4 mm. Preferably, the thickness of the protrusion of the convex lens is ( Figure 4 replaced by E in the figure) is 0.22 mm.

[0039] In one embodiment of the present invention, the plurality of protrusion structures 32 are distributed in a sawtooth shape around the convex lens 31. These evenly distributed sawtooth protrusions can evenly refract light emitted in all directions to the light-emitting area for convergence.

[0040] In one embodiment of the present invention, the raised structure includes a first portion and a second portion disposed on a side of the first portion closer to the light-emitting element, wherein the first portion has a rectangular cross-section along the light-emitting direction of the light-emitting unit, and the second portion has a triangular cross-section along the light-emitting direction of the light-emitting unit.

[0041] The inner angle of the triangle close to the light emitting unit ( Figure 4 ) is 10° to 90°. Preferably, the inner angle of the triangle close to the light emitting unit ( Figure 4 In the direction parallel to the plane of the substrate, the side length of the triangle ( Figure 4 substituted by C in the figure) can be 0.01 mm to 0.1 mm. Preferably, the side length of the triangle ( Figure 4 (replaced by C in the figure) is 0.05mm or 0.064mm.

[0042] In one embodiment of the present invention, the light-emitting unit is an LED chip; wherein the LED chip is circular, and optionally, the radius of the circular LED chip is between 0.1 mm and 0.3 mm. The convex lens disposed opposite the LED is also circular in a direction perpendicular to the plane of the substrate, and optionally, the radius of the convex lens in a direction perpendicular to the plane of the substrate is between 0.3 mm and 0.8 mm.

[0043] In one embodiment of the present invention, the number of the protrusion structures is between 20 and 3000.

[0044] In one embodiment of the present invention, the dimming unit 30 is made of a mixture of polymethyl methacrylate and acrylic adhesive, or a mixture of polycarbonate and acrylic adhesive.

[0045] Optionally, the dimming unit 30 may be made of a mixture of 50% to 80% polymethyl methacrylate and 20% to 50% acrylic adhesive. Alternatively, the dimming unit 30 may be made of a mixture of 50% to 80% polycarbonate and 20% to 50% acrylic adhesive.

[0046] In one embodiment of the present invention, the light emitting units are arranged in an array, the area capable of emitting light is the display area, and the area at the edge of the display area that does not have a display function is the non-display area. Figure 5a Reference Figure 5b The light emitting element includes a plurality of dimming units 30 (composed of Figure 5b ), wherein the specific structure of the dimming unit 30 is shown in FIG. Figure 5b The enlarged view shown on the right side of the figure; a plurality of dimming units 30 are also arranged in a matrix, and each dimming unit 30 corresponds to a light-emitting unit.

[0047] This embodiment provides a method for preparing a light-emitting element, and the method for preparing the light-emitting element includes:

[0048] Step 01: Provide a substrate 10.

[0049] Step 02: Form a light-emitting unit 20 on one side of the substrate 10. Optionally, the light-emitting unit 20 is an LED chip.

[0050] Step 03: A dimming unit 30 is formed on the side of the light-emitting unit 20 away from the substrate 10. The dimming unit 30 includes a convex lens 31 and a plurality of protruding structures 32 surrounding the convex lens 31. The protruding direction of the convex lens is close to the side of the light-emitting unit. The dimming unit is used to adjust the light emitted by the light-emitting unit into collimated light.

[0051] In one embodiment of the present invention, the step of forming the dimming unit 30 on the side of the light emitting unit 20 away from the substrate 10 includes:

[0052] Step 031: Attach a mold to the substrate 10 and inject polymethyl methacrylate or polycarbonate into the mold. The shape of the mold corresponds to the shape of the dimming unit, with the middle portion corresponding to the convex lens and the surrounding portions corresponding to the protrusion structure.

[0053] Step 032: Injecting acrylic adhesive into the mold to form the dimming unit 30, wherein the acrylic adhesive seals the substrate 10, the light-emitting unit 20 and the dimming unit 30 into a whole.

[0054] In one embodiment of the present invention, after the dimming unit 30 is prepared, the process further includes forming a thin film encapsulation layer on a side of the dimming unit 30 away from the light-emitting unit 20 .

[0055] This embodiment provides a display device, which includes the light-emitting element described in the above embodiment.

[0056] Optionally, the display device includes electronic devices such as a mobile phone, a computer, and a television. The present invention does not limit the specific type of the display device.

[0057] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. On the other hand, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0058] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0059] The block diagrams of devices, apparatuses, equipment, and systems referred to in this application are intended only as illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems may be connected, arranged, or configured in any manner.

[0060] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0061] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0062] In the description of the application, the meaning of "multiple" is at least two, for example two, three, etc., unless otherwise clearly and specifically limited. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, motion situation, etc. between each component under a certain specific posture (as shown in the drawings). If this specific posture changes, this directional indication also changes accordingly. In addition, the terms "comprise" and "have" and any deformation thereof are intended to cover non-exclusive inclusion. For example, the process, method, system, product or equipment comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes the steps or units not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0063] In addition, references to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A light-emitting element, characterized in that: include: substrate; a plurality of light-emitting units disposed on one side of the substrate; a plurality of dimming units disposed on a side of the plurality of light-emitting units away from the substrate, the dimming units comprising a convex lens and a plurality of convex structures surrounding the convex lens, wherein the convex direction of the convex lens is toward a side close to the light-emitting unit, and the dimming units are used to adjust the light emitted by the light-emitting unit into collimated light; The dimming unit is made of a mixture of 50% to 80% polymethyl methacrylate and 20% to 50% acrylic adhesive, or a mixture of 50% to 80% polycarbonate and 20% to 50% acrylic adhesive. The dimming unit is prepared by injecting the mixture for preparing the dimming unit into a mold attached to the substrate, and the positions of the multiple light-emitting units and the multiple dimming units correspond one to one; the substrate, the multiple light-emitting units and the multiple dimming units constitute a sealed whole, and the light-emitting units and the dimming units are arranged at a certain distance from each other.

2. The light-emitting element according to claim 1, wherein The orthographic projection of the dimming unit on the substrate covers the orthographic projection of the light emitting unit on the substrate.

3. The light-emitting element according to claim 1, wherein The plurality of protruding structures are distributed in a sawtooth shape.

4. The light-emitting element according to claim 1, wherein The convex curvature of the convex lens is 55° to 80°.

5. The light-emitting element according to claim 1, wherein In a direction perpendicular to the plane where the substrate is located, the shortest distance between the convex lens and the light-emitting unit is between 0.1 mm and 0.3 mm.

6. The light-emitting element according to claim 1, wherein The thickness of the protrusion of the convex lens is 0.2 mm to 0.4 mm.

7. The light-emitting element according to claim 3, wherein The raised structure includes a first part and a second part arranged on the side of the first part close to the light-emitting element, wherein the cross-section of the first part along the light-emitting direction of the light-emitting unit is rectangular; the cross-section of the second part along the light-emitting direction of the light-emitting unit is triangular, and the internal angle of the triangle close to the light-emitting unit is 10° to 90°.

8. The light-emitting element according to claim 7, wherein In a direction parallel to the plane where the substrate is located, the side length of the triangle is 0.01 mm to 0.1 mm.

9. A method for preparing a light-emitting element, characterized in that: include: providing a substrate; forming a plurality of light-emitting units on one side of the substrate; A plurality of dimming units are formed on a side of the plurality of light-emitting units away from the substrate, and the positions of the plurality of light-emitting units and the plurality of dimming units correspond one to one; the dimming unit includes a convex lens and a plurality of convex structures surrounding the convex lens, and the convex direction of the convex lens is close to the side of the light-emitting unit, and the dimming unit is used to adjust the light emitted by the light-emitting unit into collimated light; The step of forming a plurality of dimming units on a side of the plurality of light-emitting units away from the substrate comprises: Attaching a mold to the substrate, and injecting 50% to 80% of polymethyl methacrylate or 50% to 80% of polycarbonate into the mold; 20% to 50% of acrylic adhesive is injected into the mold to form the multiple dimming units, wherein the acrylic adhesive seals the substrate, the multiple light-emitting units and the multiple dimming units into a whole, and the light-emitting units and the dimming units are arranged at a certain distance.

10. A display device, characterized in that: The light-emitting element comprises the light-emitting element according to any one of claims 1 to 8.

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