Lens type LED double-sided display screen

Abstract

The invention 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 front face light splitting lens is arranged on the front face of the PCB, the back face light condensing lens is arranged on the back 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 face 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] The invention belongs to the technical field of LED display screen structure, and specifically refers to a lens-type LED double-sided display screen. Background Art

[0002] The existing LED dot matrix screen uses the light emitted by the LED to directly display the pixels. Therefore, the LED cannot emit light from the back. LED light sources must be set on both the front and back sides to achieve double-sided display. To achieve this structure, a double-sided display screen often requires a double PCB circuit board to form a light-emitting box to reduce the heat effect in a small space. As a result, the existing LED double-sided display screen has the disadvantages of large size, high cost, high power consumption, and difficult maintenance. Summary of the invention

[0003] The purpose of the present invention is to provide a lens-type LED double-sided display screen which has a simple structure, economical cost and is more energy-saving.

[0004] The technical solution to achieve the above-mentioned purpose includes the following contents.

[0005] A lens-type LED double-sided display screen includes a PCB circuit board, an array of LED light sources are arranged on the front of the PCB circuit board, and also includes a light-transmitting through hole, a front light-splitting lens arranged on the front of the PCB circuit board, and a back light-collecting lens arranged on the back of the PCB circuit board. The light-transmitting through hole is arranged on the PCB circuit board on one side of the LED light source. The front beam splitter lens comprises a first and a second optical cavity having an arc-shaped concave cavity, the opening of the arc-shaped concave cavity faces the front of the PCB circuit board, the first and the second optical cavities are connected in parallel, and the connecting part of the first and the second optical cavities is arranged above the center of the surface of the LED light source, the first optical cavity comprises an incident inner arc surface and an exit outer arc surface, the second optical cavity comprises a reflective inner arc surface, the reflective inner arc surface is treated with a reflective coating, and the reflective inner arc surface is opposite to the light-transmitting through hole, The back condenser lens is arranged directly opposite to the light-transmitting through hole. Each LED light source is equipped with a front splitter lens and a back focusing lens. When in use, the light emitted by the LED light source is separated into two parts by the connecting portion. One part enters the arc-shaped concave cavity of the first optical cavity, is refracted twice by the incident inner arc surface and the exit outer arc surface, and is emitted from the front side of the PCB circuit board. The other part enters the arc-shaped concave cavity of the second optical cavity, is reflected by the reflective inner arc surface, passes through the light-transmitting through hole, enters the back focusing lens, and is finally emitted from the back side of the PCB circuit board.

[0006] Furthermore, the front beam splitting lens is injection molded using PC material with a high light transmittance of more than 95%.

[0007] Furthermore, all the front beam splitting lenses deployed on the front side of the PCB circuit board are connected and integrally formed through the PC material to facilitate assembly, thereby further improving manufacturing efficiency.

[0008] Furthermore, the distance between the connecting portion and the light emitting surface of the LED light source is 0.8 mm.

[0009] Furthermore, the wall thickness of the first optical cavity is 1.2 mm-3.3 mm.

[0010] Furthermore, the wall thickness of the second optical cavity is 1.15 mm-3.1 mm.

[0011] Furthermore, the lateral width of the connecting portion is not greater than 2.4 mm.

[0012] Furthermore, the rear focusing lens is injection molded from PC material with a high light transmittance of more than 95%.

[0013] Furthermore, all the back focusing lenses deployed on the back surface of the PCB circuit board are connected and integrally formed through the PC material to facilitate assembly, thereby further improving the manufacturing efficiency.

[0014] The light emitted by each LED light source of the lens-type LED double-sided display screen of the present invention is divided into two parts by the front-side splitting lens, one part is emitted from the front side of the PCB circuit board, and the other part is emitted from the back side of the PCB circuit board. After the LED light sources of the array deployed on the front side are controlled by the display driving circuit to emit light and light up, an image will be displayed on the front side of the PCB, and the same image will also be displayed on the back side of the PCB circuit board.

[0015] The present invention can achieve the effect of double-sided display through the light emission of single-sided LED, and the content displayed on the front and back sides is the same. Compared with the LED double-sided display screen in the prior art, the structure is simpler and the cost is low. Since the LED is deployed only on one side, the double-sided display screen of the present invention has low heat generation and does not need to increase the volume for heat dissipation, which is beneficial to reducing the weight of the screen body. At the same time, it is more energy-saving and more convenient to maintain.

[0016] It should be noted that, for those skilled in the art, the front light splitting lens structure can be realized by the following principles, see Figure 4The different curvatures of the incident inner arc surface and the exit outer arc surface of the front beam splitter lens determine the angle between the incident angle of the light and the normal line, and the corresponding curvature determines the refraction angle after the incident and the propagation direction of the light in the lens material. Some areas of the incident inner arc surface are heavily frosted to prevent light transmission, so as to limit the final light output angle. After the light source enters the lens material through other areas of the incident inner arc surface, the refraction angle is less than the incident angle, and the light is deflected and transmitted. However, due to the bias of the light source, the light originally propagates at different distances in the air of the inner cavity, and the light arriving at different inner arc surfaces has different light losses. At this time, the light on the side with less light loss is refracted for a longer distance in the lens material, and the light on the side with greater light loss is refracted for a shorter distance, so as to ensure that the light loss is consistent as much as possible, so as to achieve the same light intensity of the final light output. When the light is emitted from the lens material, its light output angle and position depend on the curvature of the exit outer arc surface. At this time, the light transmitted by the lens material is the incident angle, and the curvature of the exit outer arc surface determines the refraction angle after the light is emitted. In the optical simulation, by continuously adjusting the thickness and curvature of the repair lens body and balancing the light loss and light output angle of the biased light source, the light output intensity can be relatively close within the 80° range (equivalent to the divergence angle of the LED light source in the prior art) of the light-emitting center of the outer arc surface, thus achieving a better display effect. The structure of the back focusing lens is relatively simple. The light from the light source is reflected by the inner arc surface and then passes through the light-transmitting through hole and then enters the back focusing lens. The light from the light source is converged into light within the range of 80° (equivalent to the divergence angle of the LED light source in the prior art) after passing through the back focusing lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an exploded structural diagram of a lens-type LED double-sided display screen of an embodiment; Figure 2 A schematic cross-sectional structure diagram of a lens-type LED double-sided display screen of an embodiment; Figure 3 It is a schematic diagram of the optical path of a single LED light source when the lens-type LED double-sided display screen of the embodiment is working; Figure 4 This is a working principle diagram of the front beam splitting lens of the embodiment.

[0018] In the figure, 1. PCB circuit board; 1-1. light-transmitting through hole; 2. LED light source; 3. front beam splitter lens; 3-1. first optical cavity; 3-1-1. incident inner arc surface; 3-1-2. exit outer arc surface; 3-2. second optical cavity; 3-2-1. reflective inner arc surface; 3-3. connecting part; 4. back focusing lens. DETAILED DESCRIPTION

[0019] The present invention is specifically described below with reference to the embodiments.

[0020] See also Figures 1 to 4A lens-type LED double-sided display screen includes a PCB circuit board 1, an array of LED light sources 2 are arranged on the front of the PCB circuit board 1, and also includes a light-transmitting through hole 1-1, a front light-splitting lens 3 arranged on the front of the PCB circuit board 1, and a back light-collecting lens 4 arranged on the back of the PCB circuit board 1. The front light-splitting lens 3 and the back light-collecting lens 4 of this embodiment are both made of high-transmittance (more than 95%) PC material injection molding of the light-emitting brand IR2200. The diameter of the light-emitting surface of the LED light source 2 is 3.0mmx3.0mm. The light-transmitting through hole 1-1 is arranged on the PCB circuit board 1 on one side of the LED light source 2. The front beam splitter lens 3 includes the first and second optical cavities with arc-shaped concave cavities. The wall thickness of the first optical cavity 3-1 is 1.2mm-3.3mm, and the wall thickness of the second optical cavity 3-2 is 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 in parallel. The connecting part 3-3 of the first and second optical cavities is arranged above the center of the surface of the LED light source 2. The width of the narrowest position 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. The reflective inner arc surface 3-2-1 is opposite to the light-transmitting through hole 1-1. The back condensing lens 4 is arranged facing the light-transmitting through hole 1-1. Each LED light source 2 is correspondingly provided with a front beam splitter lens 3 and a back beam focusing lens 4. All the front beam splitter lenses 3 deployed on the front side of the PCB circuit board 1 are connected and formed as one piece by the same material. All the back beam focusing lenses 4 deployed on the back side of the PCB circuit board 1 are connected and formed as one piece by the same material. The separate front beam splitter lenses 3 (back beam focusing lenses 4) are combined into a whole, which is convenient for manufacturing and assembly and is conducive to improving production efficiency.

[0021] When in use, the light emitted by the LED light source 2 is separated into two parts by the connecting part 3-3. One part enters the arc-shaped concave cavity of the first optical cavity 3-1, is refracted twice by the incident inner arc surface 3-1-1 and the exit outer arc surface 3-1-2, and is emitted from the front side of the PCB circuit board 1. The other part enters the arc-shaped concave cavity of the second optical cavity 3-2, is reflected by the reflective inner arc surface 3-2-1, passes through the light-transmitting through hole 1-1, and then enters the back focusing lens 4, and is finally emitted from the back side of the PCB circuit board 1.

[0022] The lens-type LED double-sided display screen of this embodiment only needs to deploy LED lamp beads on the front of the PCB board, and the light emitted by the light source is divided into two paths through the front splitter 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 is achieved without deploying LED lamp beads on both sides. The lens-type LED double-sided display screen has the advantages of simple structure, easy maintenance, low cost, small size, and energy saving.

Claims

1. A lens-type LED double-sided display screen, comprising a PCB circuit board, an array of LED light sources are arranged on the front of the PCB circuit board, characterized in that: It also includes a light-transmitting through hole, a front light-splitting lens arranged on the front of the PCB circuit board, and a back light-condensing lens arranged on the back of the PCB circuit board. The light-transmitting through hole is arranged on the PCB circuit board on one side of the LED light source. The front beam splitter lens comprises a first and a second optical cavity having an arc-shaped concave cavity, the opening of the arc-shaped concave cavity faces the front of the PCB circuit board, the first and the second optical cavities are connected in parallel, and the connecting part of the first and the second optical cavities is arranged above the center of the surface of the LED light source, the first optical cavity comprises an incident inner arc surface and an exit outer arc surface, the second optical cavity comprises a reflective inner arc surface, the reflective inner arc surface is treated with a reflective coating, and the reflective inner arc surface is opposite to the light-transmitting through hole, The back condenser lens is arranged directly opposite to the light-transmitting through hole. Each LED light source is equipped with a front splitter lens and a back focusing lens. When in use, the light emitted by the LED light source is separated into two parts by the connecting portion. One part enters the arc-shaped concave cavity of the first optical cavity, is refracted twice by the incident inner arc surface and the exit outer arc surface, and is emitted from the front side of the PCB circuit board. The other part enters the arc-shaped concave cavity of the second optical cavity, is reflected by the reflective inner arc surface, passes through the light-transmitting through hole, enters the back focusing lens, and is finally emitted from the back side of the PCB circuit board.

2. The lens-type LED double-sided display screen according to claim 1, characterized in that: The front beam splitting lens is injection-molded using PC material with a high light transmittance of more than 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 side of the PCB circuit board are connected through the PC material and formed in one piece.

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

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 1.2 mm-3.3 mm.

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

7. The lens-type LED double-sided display screen according to claim 1, characterized in that: The lateral width of the connecting portion 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 using PC material with a high light transmittance of more than 95%.

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

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