Lens type LED double-sided display screen

Abstract

The utility model belongs to the technical field of LED display screen structures, and particularly relates to a lens type LED double-sided display screen. Comprising a PCB, LED light sources arranged in an array are arranged on the front face of the PCB, the light-transmitting through hole is formed in the portion, on one side of the LED light sources, of the PCB, the front light-splitting lens comprises a first optical cavity and a second optical cavity, and the first optical cavity and the second optical cavity are provided with arc-shaped concave cavities. The connecting part of the first optical cavity and the second optical cavity is arranged above the center of the surface of the LED light source, the first optical cavity comprises an incident inner cambered surface and an emergent outer cambered surface, the second optical cavity comprises a reflecting inner cambered surface, the reflecting inner cambered surface is subjected to reflecting coating treatment, the reflecting inner cambered surface is opposite to the light-transmitting through hole, and the light-transmitting through hole is formed in the reflecting inner cambered surface. According to the double-sided LED display screen, the double-sided display effect can be achieved through light emitting of the single-sided LEDs, the manufacturing cost is low, meanwhile, more energy is saved, and maintenance is more convenient.

Description

Technical Field

[0001] This utility model belongs to the field of LED display structure technology, specifically referring to a lens-type double-sided LED display screen. Background Technology

[0002] Existing LED dot matrix screens display pixels directly using light emitted by LEDs. Therefore, LEDs cannot emit light from the back, and LED light sources are required on both the front and back sides for double-sided display. To achieve this structure, double-sided displays often require dual PCB circuit boards to build the light-emitting cabinet to reduce the heat generated in a small space. As a result, existing double-sided LED displays have disadvantages such as large size, high cost, high power consumption, and difficult maintenance. Utility Model Content

[0003] The purpose of this utility model is to provide a lens-type double-sided LED display screen that is simple in structure, economical in cost, and more energy-efficient.

[0004] The technical solutions for achieving the above objectives include the following:

[0005] A lens-type double-sided LED display screen includes a PCB circuit board, an array of LED light sources deployed on the front side of the PCB circuit board, and also includes light-transmitting through holes, a front beam-splitting lens disposed on the front side of the PCB circuit board, and a back beam-concentrating lens disposed on the back side of the PCB circuit board.

[0006] The light-transmitting hole is located on the PCB circuit board on the side of the LED light source.

[0007] The front beam-splitting lens includes a first and a second optical cavity with arc-shaped concave openings facing the front of the PCB circuit board. The first and second optical cavities are connected side-by-side, and the connection point between them is located above the center of the LED light source surface. The first optical cavity includes an incident inner arc surface and an exit outer arc surface, and the second optical cavity includes a reflective inner arc surface. The reflective inner arc surface is treated with a reflective coating and is opposite to the light-transmitting aperture.

[0008] The back-facing focusing lens is positioned directly opposite the light-transmitting aperture.

[0009] Each LED light source is equipped with a front beam-splitting lens and a rear beam-concentrating lens.

[0010] In use, the light emitted by the LED light source is divided into two parts by the connecting part. One part enters the arc-shaped concave cavity of the first optical cavity, and after being refracted twice by the incident inner arc surface and the exit outer arc surface, it is emitted from the front of the PCB circuit board. The other part enters the arc-shaped concave cavity of the second optical cavity, and after being reflected by the reflecting inner arc surface, it passes through the light-transmitting through hole, then enters the back focusing lens, and is finally emitted from the back of the PCB circuit board.

[0011] Furthermore, the front beam-splitting lens is injection molded from PC material with a light transmittance of over 95%.

[0012] Furthermore, all the front beam-splitting lenses deployed on the front of the PCB circuit board are connected and integrally formed through the PC material to facilitate assembly and further improve manufacturing efficiency.

[0013] Furthermore, the distance between the connecting portion and the light-emitting surface of the LED light source is 0.8 mm.

[0014] Furthermore, the wall thickness of the first optical cavity is 1.2mm-3.3mm.

[0015] Furthermore, the wall thickness of the second optical cavity is 1.15mm-3.1mm.

[0016] Furthermore, the lateral width of the connecting part is no greater than 2.4 mm.

[0017] Furthermore, the back-facing focusing lens is injection molded from PC material with a light transmittance of over 95%.

[0018] Furthermore, all the back-side focusing lenses deployed on the back side of the PCB circuit board are connected and integrally formed through the PC material to facilitate assembly and further improve manufacturing efficiency.

[0019] In this invention, the light emitted by each LED light source of the lens-type double-sided LED display is divided into two parts by the front beam splitting lens. One part is emitted from the front of the PCB circuit board, and the other part is emitted from the back of the PCB circuit board. After the array of LED light sources deployed on the front is controlled by the display driving circuit to light up, an image will be displayed on the front of the PCB circuit board, and the same image will also be displayed on the back of the PCB circuit board.

[0020] This invention achieves a double-sided display effect by emitting light from a single LED, with the same content displayed on both sides. Compared to existing LED double-sided display screens, this invention has a simpler structure and lower manufacturing cost. Since LEDs are deployed on only one side, the double-sided display screen generates less heat, eliminating the need to increase the volume for heat dissipation, thus reducing the weight of the screen. It is also more energy-efficient and easier to maintain.

[0021] It should be noted that, for those skilled in the art, the aforementioned front beam-splitting lens structure can be implemented using the following principle, see [link to relevant documentation]. Figure 4The different curvatures of the incident inner curved surface and the exit outer curved surface of the front beam-splitter lens determine the angle between the incident angle and the normal. The corresponding curvature determines the angle of refraction after incident and the direction of light propagation within the lens material. A heavily textured and frosted area of ​​the incident inner curved surface is applied to prevent light transmission, thus limiting the final exit angle. After the light source enters the lens material through other areas of the incident inner curved surface, the angle of refraction is smaller than the angle of incidence, causing the light to be deflected. Due to the offset of the light source, the distance the light originally traveled in the internal air cavity differs, resulting in differences in light loss for the light reaching different inner curved surfaces. Therefore, the light from the side with less light loss is refracted a longer distance within the lens material, while the light from the side with greater light loss is refracted a shorter distance, ensuring consistent light loss and achieving consistent final light intensity. When light exits the lens material, its exit angle and position depend on the curvature of the exit outer curved surface. At this point, the light transmitted through the lens material is at the angle of incidence, and the curvature of the exit outer curved surface determines the angle of refraction after exiting. In optical simulation, by continuously adjusting the thickness and curvature of the repair lens, and balancing the light loss and emission angle of the bias light source, the light intensity within an 80° range (equivalent to the divergence angle of existing LED light sources) of the emission center of the outer arc surface can be made relatively close, achieving a better display effect. The optical structure of the back-facing condenser lens is relatively simple. After reflecting the light source light from the inner arc surface, it passes through the light-transmitting aperture and then enters the back-facing condenser lens. After passing through the back-facing condenser lens, the light source light is converged to emit light within an 80° range (equivalent to the divergence angle of existing LED light sources). Attached Figure Description

[0022] Figure 1 An exploded view of the lens-type LED double-sided display screen as an example;

[0023] Figure 2 This is a schematic cross-sectional view of the lens-type LED double-sided display screen in an embodiment.

[0024] Figure 3 A schematic diagram of the optical path of a single LED light source during operation of the lens-type LED double-sided display screen in this embodiment;

[0025] Figure 4 This is a schematic diagram illustrating the working principle of the front beam-splitting lens in an embodiment.

[0026] In the figure, 1. PCB circuit board; 1-1. Light-transmitting through hole; 2. LED light source; 3. Front beam splitter; 3-1. First optical cavity; 3-1-1. Inner arc surface of incidence; 3-1-2. Outer arc surface of emission; 3-2. Second optical cavity; 3-2-1. Inner arc surface of reflection; 3-3. Connecting part; 4. Back focusing lens. Detailed Implementation

[0027] The present invention will be described in detail below with reference to the embodiments.

[0028] See Figures 1 to 4 A lens-type double-sided LED display screen includes a PCB circuit board 1, an array of LED light sources 2 deployed on the front side of the PCB circuit board 1, a light-transmitting through-hole 1-1, a front beam-splitting lens 3 disposed on the front side of the PCB circuit board 1, and a back beam-concentrating lens 4 disposed on the back side of the PCB circuit board 1. In this embodiment, both the front beam-splitting lens 3 and the back beam-concentrating lens 4 are injection molded from high-transmittance (above 95%) PC material of the IR2200 brand. The emitting surface diameter of the LED light source 2 is 3.0mm x 3.0mm.

[0029] A light-transmitting through-hole 1-1 is provided on the PCB circuit board 1 on one side of the LED light source 2.

[0030] The front beam-splitting lens 3 includes a first optical cavity and a second optical cavity with an arc-shaped concave cavity. The first optical cavity 3-1 has a wall thickness of 1.2mm-3.3mm, and the second optical cavity 3-2 has a wall thickness of 1.15mm-3.1mm. The opening of the arc-shaped concave cavity faces the front of the PCB circuit board 1. The first and second optical cavities are connected side by side. The connecting part 3-3 of the first and second optical cavities is located above the center of the surface of the LED light source 2. The width of the narrowest part of the connecting part 3-3 is 0.2mm, and the distance between the connecting part 3-3 and the light-emitting surface of the LED light source 2 is 0.8mm. The first optical cavity 3-1 includes an incident inner arc surface 3-1-1 and an exit outer arc surface 3-1-2. The second optical cavity 3-2 includes a reflective inner arc surface 3-2-1. The reflective inner arc surface 3-2-1 is treated with a reflective coating and is opposite to the light-transmitting through-hole 1-1.

[0031] The rear-facing focusing lens 4 is positioned directly opposite the light-transmitting aperture 1-1.

[0032] Each LED light source 2 is provided with a front beam splitter 3 and a back beam condenser 4. All the front beam splitters 3 deployed on the front of the PCB circuit board 1 are connected and integrally formed using the same material. All the back beam condensers 4 deployed on the back of the PCB circuit board 1 are connected and integrally formed using the same material. This combines the separate front beam splitters 3 (back beam condensers 4) into a whole, which is convenient for manufacturing and assembly and helps to improve production efficiency.

[0033] In use, the light emitted by the LED light source 2 is divided into two parts by the connecting part 3-3. One part enters the arc-shaped concave cavity of the first optical cavity 3-1, and after being refracted twice by the incident inner arc surface 3-1-1 and the exit outer arc surface 3-1-2, it is emitted from the front of the PCB circuit board 1. The other part enters the arc-shaped concave cavity of the second optical cavity 3-2, and after being reflected by the reflecting inner arc surface 3-2-1, it passes through the light-transmitting through hole 1-1, and then enters the back focusing lens 4, and is finally emitted from the back of the PCB circuit board 1.

[0034] The lens-type double-sided LED display screen of this embodiment only requires the deployment of LED light sources on the front side of the PCB board. The light emitted by the light source is split into two paths by the front beam splitting lens 3, one path is emitted from the front of the PCB board and the other path is emitted from the back of the PCB board. Double-sided display can be achieved without deploying LED light sources on both sides. This lens-type double-sided LED display screen has the advantages of simple structure, convenient maintenance, low cost, small size and energy saving.

Claims

1. A lens-type double-sided LED display screen, comprising a PCB circuit board, wherein an array of LED light sources is deployed on the front side of the PCB circuit board, characterized in that, It also includes light-transmitting through-holes, a front beam-splitting lens located on the front side of the PCB board, and a back beam-concentrating lens located on the back side of the PCB board. The light-transmitting hole is located on the PCB circuit board on the side of the LED light source. The front beam-splitting lens includes a first and a second optical cavity with arc-shaped concave openings facing the front of the PCB circuit board. The first and second optical cavities are connected side-by-side, and the connection point between them is located above the center of the LED light source surface. The first optical cavity includes an incident inner arc surface and an exit outer arc surface, and the second optical cavity includes a reflective inner arc surface. The reflective inner arc surface is treated with a reflective coating and is opposite to the light-transmitting aperture. The back-facing focusing lens is positioned directly opposite the light-transmitting aperture. Each LED light source is equipped with a front beam-splitting lens and a rear beam-concentrating lens. In use, the light emitted by the LED light source is divided into two parts by the connecting part. One part enters the arc-shaped concave cavity of the first optical cavity, and after being refracted twice by the incident inner arc surface and the exit outer arc surface, it is emitted from the front of the PCB circuit board. The other part enters the arc-shaped concave cavity of the second optical cavity, and after being reflected by the reflecting inner arc surface, it passes through the light-transmitting through hole, then enters the back focusing lens, and is finally emitted from the back of the PCB circuit board.

2. The lens-type LED double-sided display screen according to claim 1, characterized in that, The front beam splitter is injection molded from PC material with a light transmittance of over 95%.

3. The lens-type LED double-sided display screen according to claim 2, characterized in that, All the front beam-splitting lenses deployed on the front of the PCB circuit board are connected and integrally formed through the PC material.

4. The lens-type LED double-sided display screen according to claim 1, characterized in that, The distance between the connecting part and the light-emitting surface of the LED light source is 0.8mm.

5. The lens-type LED double-sided display screen according to claim 1, characterized in that, The wall thickness of the first optical cavity is 1.2mm-3.3mm.

6. The lens-type LED double-sided display screen according to claim 1, characterized in that, The second optical cavity has a wall thickness of 1.15mm-3.1mm.

7. The lens-type LED double-sided display screen according to claim 1, characterized in that, The lateral width of the connecting part is no greater than 2.0 mm.

8. The lens-type LED double-sided display screen according to claim 1, characterized in that, The back focusing lens is injection molded from PC material with a light transmittance of over 95%.

9. The lens-type LED double-sided display screen according to claim 8, characterized in that, All the back-side focusing lenses deployed on the back of the PCB circuit board are connected and integrally formed through the PC material.

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