Wide-viewing-angle LED screen based on COB

Abstract

A COB-based wide-viewing-angle LED screen comprises a COB substrate, LED light-emitting bodies, a hemispherical lens part and a diffusion layer, and the LED light-emitting bodies are distributed in an array and welded to the COB substrate; the hemispherical lens parts are distributed on the COB substrate in an array mode and wrap the LED light-emitting bodies, the hemispherical lens parts can wrap the LED light-emitting bodies for protection, light rays can be diffused through the spherical curved surfaces, the transmission angle of the light rays is improved, the visual angle can be expanded, and the spatial frequency of the LED light-emitting bodies is eliminated so that the moire phenomenon can be eliminated. The diffusion layer is arranged on the COB substrate and wraps the hemispherical lens part; a plurality of diffusion particles are arranged in the diffusion layer; the diffusion layer can further diffuse the light, improve the transmission angle of the light, facilitate the expansion of the visual angle and eliminate the moire phenomenon. And on the other hand, the refractive indexes of the hemispherical lens part and the diffusion layer are different, and the light rays are emitted after being refracted for multiple times, so that the transmission angle of the light rays can be improved to a certain extent, the visual angle can be expanded, and the moire phenomenon can be eliminated.

Description

Technical Field

[0001] The utility model relates to the field of display screens, in particular to a COB-based wide-viewing angle LED screen. Background Art

[0002] COB is a display screen manufacturing process that directly solders the LED light source on the PCB board. Currently, most COBs are made by directly covering the entire PCB with transparent resin or other materials after soldering the LED light source to protect the LED light source and its gold wire from external damage.

[0003] Since LED light sources are arranged in an array, they have a certain periodicity. When the camera equipment shoots the LED screen, obvious moiré phenomenon often occurs. However, the moiré phenomenon is not the information required by the captured image itself, so it needs to be eliminated. In the prior art, a whole diffuser is generally installed in front of the LED screen. The surface of the diffuser is frosted, and the diffuser is used for atomization to reduce the sharpness, thereby changing the spatial frequency to eliminate the moiré phenomenon. Although this technology can eliminate moiré, it will reduce the brightness of the screen. In addition, although the diffuser can solve the moiré phenomenon, it cannot effectively expand the viewing angle range. Therefore, this existing solution still has room for improvement. Utility Model Content

[0004] The utility model aims to solve the above-mentioned problems and provide a COB-based wide-viewing angle LED screen which can improve light diffusion, thereby improving the moiré phenomenon and expanding the viewing angle.

[0005] In order to solve the above problems, the utility model provides a COB-based wide-viewing angle LED screen, characterized in that it includes a COB substrate, an LED light-emitting body, a hemispherical lens part, and a diffusion layer. The LED light-emitting body is distributed in an array and welded on the COB substrate; the hemispherical lens part is distributed in an array on the COB substrate and wraps the LED light-emitting body; the diffusion layer is arranged on the COB substrate and wraps the hemispherical lens part; and a plurality of diffusion particles are arranged in the diffusion layer.

[0006] Furthermore, a heat dissipation layer is provided on the surface of the diffusion layer.

[0007] Furthermore, the hemispherical lens portion is made of a transparent heat-conductive material.

[0008] Furthermore, the diffusion layer is made of a transparent heat-conductive material.

[0009] Furthermore, a refractive index of the hemispherical lens portion is different from a refractive index of the diffusion layer.

[0010] Furthermore, the heat dissipation layer is made of a thermally conductive material having electrical conductivity.

[0011] Further, the refractive index of the heat dissipation layer is different from the refractive index of the diffusion layer.

[0012] Furthermore, the diffusion particles are in the shape of translucent spheres, and light can be reflected and refracted on the spherical surface.

[0013] Furthermore, the refractive index of the diffusion particles is different from the refractive index of the diffusion layer.

[0014] Furthermore, the spherical particles are hollow spheres.

[0015] The beneficial contribution of the utility model is that it effectively solves the above-mentioned problems. The utility model arranges a hemispherical lens part outside each LED light-emitting body, which can not only wrap the LED light-emitting body for protection, but also diffuse the light through the spherical curved surface, improve the transmission angle of the light, and is conducive to expanding the viewing angle, and eliminates the spatial frequency of the LED light-emitting body to eliminate the moiré phenomenon. In addition, a diffusion layer is provided on the hemispherical lens part, which is provided with diffusion particles, which can further diffuse the light, improve the transmission angle of the light, and is conducive to expanding the viewing angle, and eliminate the moiré phenomenon. On the other hand, the refractive indexes of the hemispherical lens part and the diffusion layer are different, and the light needs to be refracted multiple times before it can be emitted, which can also improve the transmission angle of the light to a certain extent, and is conducive to expanding the viewing angle, and eliminating the moiré phenomenon. The COB-based wide-viewing angle LED screen of the utility model has the characteristics of high brightness and wide viewing angle, and its structure is simple and easy to implement, and it has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the principle structure of the utility model.

[0018] Figure 3 It is a cross-sectional view of the utility model.

[0019] Figure symbols: COB substrate 10 , LED light emitting body 20 , hemispherical lens portion 30 , diffusion layer 40 , diffusion particles 41 , heat dissipation layer 50 . DETAILED DESCRIPTION

[0020] The following embodiments are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0021] like Figure 1 , Figure 2 , Figure 3As shown, the COB-based wide-viewing angle LED screen of the present invention comprises a COB substrate 10, an LED illuminator 20, a hemispherical lens portion 30 and a diffusion layer 40. Further, it may also include a heat dissipation layer 50.

[0022] The COB substrate 10 is a known COB substrate 10 , which is not limited in this embodiment.

[0023] The LED luminous bodies 20 are distributed in an array on the COB substrate 10 and are soldered on the COB substrate 10 by a known process. Generally, the LED luminous bodies 20 include three LED light-emitting chips, which correspond to the red LED chip, the blue LED chip, and the green LED chip in the three primary colors of RGB, respectively. Of course, the specific configuration of the LED luminous bodies 20 is not limited, its color is not limited, and the number of LED light-emitting chips it includes is also not limited.

[0024] The LED light emitting bodies 20 are spaced apart from each other, and the distance between them can be set as required, which is not limited in this embodiment.

[0025] The hemispherical lens portion 30 is mainly used to diffuse light. The hemispherical lens portion 30 is distributed in an array, is disposed on the COB substrate 10, and wraps the LED light emitter 20 therein.

[0026] Each LED illuminator 20 is wrapped with a hemispherical lens portion 30. The hemispherical lens portion 30 wraps the LED illuminator 20, which not only protects the LED illuminator 20, but also refracts and diffuses light through the lens effect of the hemispherical lens portion 30 to improve the viewing angle and eliminate the moiré phenomenon.

[0027] The hemispherical surface of the hemispherical lens portion 30 completely covers the LED light emitting body 20 .

[0028] The hemispherical lens parts 30 are spaced apart from each other, and the distance between them can be set as required.

[0029] The hemispherical lens portion 30 is made of a transparent material. Further, the hemispherical lens portion 30 is made of a transparent heat-conducting material, such as a heat-conducting and light-transmitting silicone material. When the hemispherical lens portion 30 has good thermal conductivity, it is also beneficial to transfer the heat generated by the LED light-emitting body 20 to the outside, thereby improving the heat dissipation performance of the LED screen.

[0030] The diffusion layer 40 is mainly used to further diffuse the light, and is disposed on the COB substrate 10 and wraps the hemispherical lens portion 30. The surface of the diffusion layer 40 facing away from the COB substrate 10 is a plane, and a certain distance is between the diffusion layer 40 and the top of the hemispherical lens portion 30.

[0031] The refractive index of the diffusion layer 40 is different from that of the hemispherical lens portion 30. Therefore, when the light reaches the interface between the diffusion layer 40 and the hemispherical lens portion 30, the light will be refracted, which is beneficial to change the light transmission angle and diffuse the light, thereby facilitating improving the viewing angle and eliminating the moiré phenomenon.

[0032] The diffusion layer 40 is made of a transparent material, and further, it is made of a transparent heat-conducting material, such as a heat-conducting and light-transmitting silicone material, etc. When the diffusion layer 40 has good thermal conductivity, it is beneficial to transfer the heat generated by the COB substrate 10 to the outside, thereby improving the heat dissipation performance of the LED screen.

[0033] In order to further improve the diffusion effect, diffusion particles 41 are provided in the diffusion layer 40. The diffusion particles 41 can diffuse light.

[0034] Furthermore, the diffusion particles 41 are translucent spherical. When light reaches the spherical surface of the diffusion particles 41, the light can be emitted and refracted. When the diffusion particles 41 reflect the light, the transmission angle of the light can be changed through multiple reflections, so that the light can be emitted from various angles, thereby increasing the viewing angle range. When the diffusion particles 41 refract the light, the diffusion angle of the light can be increased to a certain extent, thereby increasing the viewing angle range and facilitating the elimination of the moiré phenomenon.

[0035] The material of the diffusion particles 41 is not limited, and it can be a conductive material or a non-conductive material. The diffusion particles 41 can be a solid structure or a hollow structure. The diffusion particles 41 can be a single-layer structure or a multi-layer structure, and can be specifically configured according to needs. Preferably, the diffusion particles 41 are hollow structures, which are hollow inside and have a reflective coating on their outer surface. The reflective coating is translucent, so it can reflect and refract light. When the diffusion particles 41 are hollow, when the light passes through the diffusion particles 41, it will be refracted several times before it is emitted from other positions of the diffusion particles 41, and multiple refractions can diffuse the light to a certain extent, thereby further increasing the diffusion angle of the light, thereby increasing the viewing angle range and facilitating the elimination of moiré.

[0036] Furthermore, the refractive index of the diffusion particles 41 is different from the refractive index of the diffusion layer, so that light can be refracted when passing through the interface, thereby facilitating an increase in the diffusion angle of the light.

[0037] The heat dissipation layer 50 is disposed on the surface of the diffusion layer 40, and is transparent and made of a heat-conducting material with electrical conductivity. The heat-conducting material with electrical conductivity may be a known high-thermal-conducting conductive adhesive material, and is mainly composed of a resin and a conductive filler. For example, silver powder or nano silver powder is added to the resin material, which not only plays a role in heat conduction and electrical conduction, but also the silver powder particles themselves have a certain reflective property, which can act as a diffusion example to diffuse the light, thereby improving the viewing angle and eliminating the moiré phenomenon.

[0038] Furthermore, the refractive index of the heat dissipation layer 50 is different from that of the diffusion layer 40 , so that light will be refracted when passing through the interface, thereby facilitating the improvement of the light diffusion angle, thereby expanding the viewing angle and eliminating the moiré phenomenon.

[0039] Although the present invention is disclosed through the above embodiments, the scope of the present invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the concept of the present invention.

Claims

1. A wide-viewing angle LED screen based on COB, characterized in that: It includes: COB substrate(10), LED light emitters (20), which are distributed in an array and welded on the COB substrate (10); Hemispherical lens portions (30) are distributed in an array on the COB substrate (10) and wrap around the LED light emitter (20); A diffusion layer (40) is provided on the COB substrate (10) and wraps the hemispherical lens portion (30); a plurality of diffusion particles (41) are provided in the diffusion layer (40).

2. The COB-based wide-viewing angle LED screen as claimed in claim 1, characterized in that: A heat dissipation layer (50) is provided on the surface of the diffusion layer (40).

3. The COB-based wide-viewing angle LED screen as claimed in claim 1, characterized in that: The hemispherical lens portion (30) is made of a transparent heat-conducting material.

4. The COB-based wide-viewing angle LED screen as claimed in claim 2, characterized in that: The diffusion layer (40) is made of a transparent heat-conducting material.

5. The COB-based wide-viewing angle LED screen as claimed in claim 1, characterized in that: The refractive index of the hemispherical lens portion (30) is different from the refractive index of the diffusion layer (40).

6. The COB-based wide-viewing angle LED screen as claimed in claim 2, characterized in that: The heat dissipation layer (50) is made of a heat-conducting material with electrical conductivity.

7. The COB-based wide-viewing angle LED screen as claimed in claim 2, characterized in that: The refractive index of the heat dissipation layer (50) is different from the refractive index of the diffusion layer (40).

8. The COB-based wide-viewing angle LED screen as claimed in claim 1, characterized in that: The diffusion particles (41) are in the shape of a semi-transparent sphere, and light can be reflected and refracted on the spherical surface.

9. The COB-based wide-viewing angle LED screen as claimed in claim 1, characterized in that: The refractive index of the diffusion particles (41) is different from the refractive index of the diffusion layer (40).

10. The COB-based wide-viewing angle LED screen as claimed in claim 8, characterized in that: The spherical particles are hollow spheres.

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