WO2020151604A1

WO2020151604A1 - Led display screen

Info

Publication number: WO2020151604A1
Application number: PCT/CN2020/072888
Authority: WO
Inventors: 李士杰; 王霖; 孙微; 胡飞; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2019-01-24
Filing date: 2020-01-18
Publication date: 2020-07-30
Also published as: CN111477735A

Abstract

The present invention belongs to the technical field of LED display. Disclosed is an LED display screen, characterized by comprising: an LED array containing a plurality of LED light-emitting units disposed on a substrate; a diffusion film disposed at a light emission side of the LED array; and a regular hexagonal light-shielding frame disposed between the LED array and the diffusion film, and comprising a hollow grid array containing a plurality of hollow grids, wherein the hollow grids correspond one-to-one to the LED light-emitting units, and projections of the hollow grids on the substrate respectively surround the LED light-emitting units corresponding thereto. The invention adopts a regular hexagonal light-shielding frame structure and a diffusion film, such that, when the LED display screen resolution and the wall thickness of the light-shielding frame structure are preconditioned, the invention can reduce an area of black gaps formed between the regular hexagonal light-shielding frame structure and the diffusion film attached thereto, and improve the fill rate of the LED display screen.

Description

LED display

Technical field

The invention belongs to the field of display technology, and specifically relates to an LED display screen.

Background technique

LED lamp beads have the characteristics of high luminous brightness. The large screen composed of dot matrix can display very high brightness (for example, higher than 500Nit). At the same time, because the LED lamp beads can be individually controlled to turn on and off, the screen can span from low to high. A large brightness range makes it easier to achieve HDR (High Dynamic Range) display effects. The light-emitting spectrum of the LED chip is relatively wide, and the combination of red, green and blue covers a large color range, which can easily meet the DCI color gamut standard, and even challenge the REC2020 color gamut standard. In addition to the advantages of brightness and color gamut, the LED display has high display uniformity, which is very suitable for making large screens (above 50 square meters). Due to these advantages of LED array display, coupled with the continuous reduction in the cost of related components and the continuous maturity of technology, some manufacturers have successively introduced LED array displays to present high-quality images, such as Samsung’s Cinema LED Screen and Sony’s Crystal display. . LED large-screen displays have gradually entered the field of high-quality video projection. As the technology continues to mature, the application scenarios will continue to expand.

However, there are still some problems with large-size LED displays. For example, the LED lamp beads corresponding to each pixel in the LED screen cannot fill the entire pixel size, and the large distance between the LED lamp beads results in a strong image display, and the brightness distribution is extremely uneven, making the audience feel dazzling.

To solve this problem, the technical solution with application publication number CN104049374A provides an LED screen that can realize surface light emission. As shown in Figure 1, the LED screen is provided with a barrier frame array 013 with a reflective film on the inner wall between the pixels of the LED pixel point array 011 to ensure that adjacent LED pixels do not crosstalk; and further in the barrier frame array 013 A homogenizing plate 014 is set on it to improve the uniformity of light.

However, in this technical solution, the barrier frame frame 013 is arranged in a rectangular manner. The rectangular barrier frame frame has poor bending resistance and will be bent during actual assembly. Long-term use is likely to cause deformation, which makes the life of the LED screen shorter. In the case of the same wall thickness and area, the side length of the barrier frame is longer, which makes the black interval seam more obvious when viewing the LED screen and cannot achieve the best pixel filling rate.

Summary of the invention

In order to solve at least one of the above-mentioned problems in the prior art, the present invention aims to provide an LED display screen. The present invention realizes a significant enhancement of display quality without requiring a substantial increase in cost.

In order to solve the above technical problems, the technical solution adopted by the present invention is:

An LED display screen, characterized in that it comprises:

The LED array includes a plurality of LED light-emitting units, and the LED light-emitting units are arranged on a substrate;

The diffusion film is arranged on the light emitting side of the LED array;

The regular six-sided light-shielding frame is arranged between the LED array and the diffusion film, and includes a hollow grid array including a plurality of hollow grids, and the hollow grids correspond to the LED light-emitting units one-to-one, and the The projection of the hollow grid on the substrate surrounds its corresponding LED light-emitting unit.

In one embodiment, the wall thickness on the light entrance side and the light exit side of the regular hexagonal light-shielding frame are the same.

In one embodiment, the wall thickness of the regular hexagonal light-shielding frame ranges from 0.2 mm to 1.2 mm, preferably 0.3 mm to 0.7 mm.

In one embodiment, the wall thickness on the light entrance side and the light exit side of the regular six-sided light-shielding frame are different, wherein the wall thickness of the regular six-sided light-shielding frame gradually decreases from the light entrance side to the light exit side.

In one embodiment, the wall thickness of the light-incident side of the regular six-sided light-shielding frame is w2, and the size of w2 ranges from 0.7 mm to 1.2 mm.

In one embodiment, the wall thickness of the light emitting side of the regular six-sided light-shielding frame is w1, and the size of w1 ranges from 0.2 mm to 0.5 mm.

In one embodiment, the side wall of the regular hexagonal light-shielding frame has an inclination angle, and the inclination angle ranges from 3° to 5°.

In one embodiment, the height of the regular hexagonal light-shielding frame is t, and the size of t is in the range of 3mm-6mm.

In one embodiment, the side wall of the regular hexagonal light-shielding frame is provided with a light reflection layer or a light absorption layer.

In one embodiment, the regular hexagonal shading frame is manufactured by 3D printing, injection molding, or splicing criss-cross shading strips.

In one embodiment, the LED light-emitting unit includes RGB three-color light-emitting chips, and the arrangement of the RGB three-color light-emitting chips is perpendicular to the side length of the regular six-sided light-shielding frame or parallel to the sides of the regular six-sided light-shielding frame long.

The beneficial effects of the present invention are: the LED display screen of the present invention adopts a regular hexagonal light-shielding frame structure and a diffusion film. Under the same resolution of the LED display screen and the same light-shielding frame structure wall thickness, the regular hexagonal light-shielding frame The area of the black spacer where the structure is attached to the diffusion film is smaller, and the filling rate of the LED display is higher.

Description of the drawings

FIG. 1 is a schematic diagram of the structure of a barrier frame array in the prior art.

Figure 2 is a schematic diagram of the overall structure of the LED display screen of the present invention.

Figure 3 is a top view of three light-shielding frame structures of the LED display screen.

4 is a schematic diagram of the structure of an LED display screen according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a light-shielding frame of an LED display screen according to an embodiment of the present invention.

Fig. 6 is a perspective view of the light-shielding frame of the LED display screen in the second embodiment of the present invention.

Fig. 7 is a schematic diagram of an LED display screen according to the second embodiment of the present invention.

Fig. 8 is a simulation diagram of chromatic aberration when the RGB chips of the LED are arranged perpendicular to the side length of the light-shielding structure.

Fig. 9 is a simulation diagram of chromatic aberration when the RGB chips of the LED are arranged parallel to the side length of the light-shielding structure.

detailed description

The present invention will be further explained below in conjunction with the drawings and specific embodiments.

The present invention provides an LED display screen, which is characterized by comprising: an LED array, including a plurality of LED light-emitting units, the LED light-emitting units are arranged on a substrate; a diffusion film is arranged on the light-emitting side of the LED array; The light-shielding frame structure is arranged between the LED array and the diffusion film, and includes a hollow grid array including a plurality of hollow grids. The hollow grids correspond to the LED light-emitting units one to one, and the hollows The projection of the grid on the substrate surrounds its corresponding LED light-emitting unit; specifically, in the embodiment of the present invention, the regular six-sided light-shielding frame includes two structural arrangements, the first structure of the regular six-sided light-shielding frame is The wall thickness of the light side and the light exit side are the same; the wall thickness of the light entrance side and the light exit side of the regular hexagonal light-shielding frame of the second structure is different, and the wall thickness of the regular hexagonal light-shielding frame gradually decreases from the light entrance side to the light exit side.

Figure 2 is a schematic diagram of the overall structure of the LED display screen of the present invention. As shown in FIG. 2, the present invention provides an LED display screen 1000, which includes a substrate 10, an LED array 100, a regular six-sided light-shielding frame 200 and a diffusion film 300 arranged in sequence. The diffusion film 300 is arranged on the light emitting side of the LED array 100. The LED array 100 is an array composed of a plurality of LED light-emitting units 110 (ie, LED lamp beads), which are arranged on the substrate 10, and each light-emitting point serves as a single pixel of the display screen. One LED light-emitting unit 110 corresponds to one of the LED display screens. Pixels, including red, green and blue, namely: RGB three-color light-emitting chips. The regular six-sided light-shielding frame 200 is arranged between the LED array 100 and the diffusion film 300 and includes a hollow grid array including a plurality of hollow grids 210. The pitch of the hollow grid 210 is consistent with the dot pitch of the LED light-emitting unit and has a one-to-one correspondence with the LED light-emitting unit 110. The hollow grid has uniform spacing and a certain thickness of side walls. Each LED light-emitting unit is placed directly under the hexagonal light-shielding frame grid. It is also possible to align or slightly deviate from the center, as long as the hollow grid is on the substrate. The projection on 10 surrounds its corresponding LED light-emitting unit. Each grid of the regular six-sided light-shielding frame has six side walls, which can be either an absorbing layer or a reflective layer. In short, none of the six side walls can transmit light. This arrangement uses highly reflective sidewalls to homogenize the LEDs, so that the brightness of each pixel can be evenly distributed, while avoiding light crosstalk between pixels.

In the present invention, the light emitted by the LED array 100 can be emitted through the projection area of the regular hexagonal light shielding frame on the diffusion film 300. The diffusion film 300 covers the top of the six-sided light-shielding frame 200 to further enhance the viewing angle of the screen, and at the same time play a role in covering, so that the LED display has a smooth display image, regardless of whether it is viewed from a distance or close, under various ambient light conditions. There are continuous and uniform display images. The light emitted by the LED array shines on the diffuser film, making the diffuser film a new "passive light source", which improves the pixel filling rate. At the same time, the diffuser film has a divergent effect on the light, increasing the viewing angle of the LED display. The side wall of the grid of the regular six-sided light-shielding frame plays a role of guiding light and limiting the light crosstalk between the pixels. The regular six-sided light-shielding frame needs to be greater than a certain height to make the illumination distribution within the pixels uniform. High pixel filling rate and uniform illumination distribution help to improve the accuracy of LED display point-by-point correction.

In the present invention, the size range of the pitch p of the light shielding frame 200 is 0.1 mm to 10 mm, and the preferred size range of the pitch is 2 mm to 5 mm. The wall thickness of the shading frame ranges from 0.05 mm to 2 mm, the height of the shading frame 200 ranges from 0.5 mm to 10 mm, and the preferred height range is from 2 mm to 5 mm.

When the reflective layer is provided on the sidewall of the grid of the regular hexagonal light-shielding frame, it can be a specular reflective layer, such as aluminum silver powder, or a high-reflectivity scattering particle coating. If the material of the regular hexagonal light-shielding frame 200 has high reflectivity, such as a metal material, no additional reflective layer is required.

The regular six-sided shading frame can be made in a variety of ways, such as: 3D printing, injection molding, or splicing crisscross shading strips. The preferred manufacturing process is metal mold injection. The molding materials are PC, PMMA, PVC, PP, PA , PLA, ABS, PET, PTFE, etc.

In an embodiment of the present invention, a method for large-scale production of regular hexagonal light-shielding frames is proposed. Specifically, the first is the production of metal molds, that is, metal molds with the same structure as the hexagonal light-shielding frame are made by metal processing. Then use a silicone mold to re-mold to make, specifically, to reprint the structure of the metal mold with a silicone mold to form the reverse structure of the hexagonal shading frame, and then use the silicone mold to inject the hexagonal shading frame.

In an embodiment of the present invention, the hexagonal light-shielding frame is quickly manufactured by means of metal mold injection. Secondly, an opaque coating needs to be coated on the inner side wall of the regular hexagonal light-shielding frame. Generally, this method uses resin material as the molding material for metal mold injection, which does not have high reflectivity or light absorption, so it is necessary to coat the inner wall with an opaque coating. There are many methods for applying an opaque coating to the resin layer. The preferred method is an electroless plating method based on the reduction of silver by dopamine (corresponding to the silver reflective layer), as well as the reflective paint immersion method, spraying method, and the like.

A reflective layer is provided on the inner wall of the light-shielding frame, and when the LED light-emitting unit 110 emits light toward the hollow light-shielding frame, the light beam is reflected by the reflective layer and then exits through the optical diffusion film. It is understandable that, when the light-shielding frame has a certain height, the light beam emitted by the light-emitting unit is reflected once by the reflective layer and then exits. Other light beams, especially the light beam incident on the reflective layer at a small angle, can exit after multiple reflections. . Therefore, the light beams emitted by the LED light-emitting units are reflected and emitted, which is beneficial to improve the uniformity of the light beam distribution. The six-sided reflective wall surrounded by the reflective layer of the shading frame can be equivalent to an optical integrator rod to homogenize the light of the LED light-emitting unit.

The specific reflective layer can be a specular reflective layer or a diffuse reflective layer. The specular reflective layer can be a metal reflective coating, such as a silver reflective layer, an aluminum reflective layer, etc., or a composite layer of media with different refractive indexes. The diffuse emission layer can also be a diffuse reflection layer with a certain divergence angle. The reflection effect of the diffuse reflection layer on incident light is different from that of the specular reflection layer. The reflected light presents a light cone shape, that is, the reflected light diffuses at a certain angle. According to the angular distribution of the reflected light, it can be divided into Lambertian reflective layer, Gaussian reflective layer, etc. The reflected light incident on the Lambertian reflective layer presents a Lambertian distribution (uniform angular distribution of 180°) and incident on the Gaussian reflective layer The reflected light shows a Gaussian distribution (the beam is more concentrated in the center beam position, and the center beam is the beam when it is reflected by the mirror).

Figure 3 is a top view of the regular hexagonal shading frame of the present invention and the other two kinds of shading frames. The top views of the different shading frames are regular hexagon 301, square 302, and circle 303. When the wall thickness of the shading frame is the same, At this time, two-dimensional graphics can be used to calculate the filling rate relationship between different shading frames. Specifically, the top view of each light-shielding frame includes multiple light-shielding units, and each light-shielding unit corresponds to a pixel unit S1, S2, and S3. When the area of the pixel unit corresponding to the light-shielding unit is equal, it is assumed that the area of the pixel unit is 1, namely S1 The areas of S2 and S3 are all 1. It can be calculated that the perimeter of the corresponding pixel unit is 3.72, square 4, and 3.54 circle. It can be seen that the regular hexagon is 7% shorter than the square perimeter, which corresponds to the three-dimensional shading frame structure. When the wall thickness of the shading frame is the same, the black gap area of the LED display screen corresponding to the hexagonal shading frame structure Smaller, higher pixel fill rate. From the above calculation, it is found that the circle 303 is the limit case of the polygon, and the circumference is the shortest. However, since the circular shading units cannot be seamlessly connected to each other, the opaque area on the shading structure becomes significantly larger, which is not suitable for increasing the pixel filling rate. Taking into account comprehensive considerations, the regular hexagonal frame structure effectively shortens the length of the perimeter, and the structure itself has the advantage of increasing the pixel filling rate. It should be noted that this is to facilitate calculations and illustrate the advantages of the regular hexagon over the square. The invention of this case does not It is not limited to the regular six-sided light-shielding frame structure, and all six-sided light-shielding frame structures that can realize seamless splicing fall within the protection scope of the present invention.

FIG. 2 shows the overall structure of the LED display screen of the present invention. The following is divided into a plurality of embodiments to respectively describe the regular six-sided light-shielding frame of the present invention, and the specific structures are respectively described. For ease of description, the drawings of the embodiments are mainly described with a schematic structural diagram of a single pixel unit of the LED display screen.

Example one

4 is a schematic diagram of the structure of a pixel of an LED display screen according to an embodiment of the present invention. As shown in FIG. 4, the regular six-sided light-shielding frame 200 has a uniform wall thickness design, that is, the light-incident side wall thickness and the light-exit side wall thickness of the light-shielding frame are the same as w, and the range of the wall thickness w is 0.2mm-1.2mm, preferably It is 0.3mm-0.7mm, the height of the shading frame is t, and the range of t is 3mm-6mm. The regular six-sided light-shielding frame 200 is arranged in contact with the diffusion film 300, the regular six-sided light-shielding frame 200 is arranged in contact with the substrate 100, the LED light-emitting unit 110 is arranged on the substrate 10, and the side wall of the light-shielding frame structure is provided with a scattering layer. The reflectivity is 60%-95%, preferably 80%-90%; the light diffusion angle of the scattering layer is 50°-90°; more preferably 80°-90°. Furthermore, as shown in Figure 5, the corresponding wall thickness of the regular six-sided shading frame of the LED display screen is w, and the side length is a. The following is a detailed description of the filling rate σ of the LED display screen and the shading frame wall thickness w and side length a The relationship is explained. Taking each pixel unit included in the light-shielding frame as an example, the area where the light-blocking part of the pixel unit is attached to the optical diffusion film, that is, the area of the black gap is

And the area of the pixel unit is

S=3*a ² *cos30°

Then the fill rate is

According to the above formula, the linear relationship between the filling rate and the wall thickness of the pixel unit can be obtained when the side length of the regular six-sided light-shielding frame is unchanged. As the wall thickness W of the pixel unit increases, the filling rate decreases linearly. For example, when the wall thickness w of the shading frame is 0.5mm, the side length a corresponding to the hexagonal shading frame is 2.69mm. At this time, the area S of the pixel unit and the bonding area S′ of the shading frame structure and the optical diffusion film (I.e. the area of the black gap)

And the area of the pixel unit is

S=3*a ² *cos30°=18.8mm ²

Then the fill rate is

Since the shading frame is used to prevent the light crosstalk between adjacent LED light-emitting units, and at the same time, it acts as a support for the diffusion film. Therefore, the wall thickness of the shading frame cannot be made very thin when the wall thickness of the shading frame is the same. The shading frame is usually manufactured by an open-mold injection molding process, and the process also has a certain yield limit on the wall thickness.

In addition, it should be noted that the connection method between the light-shielding frame and the diffusion film and the substrate of this embodiment is not limited to the direct connection shown in FIG. 4, and it should be understood that the light-shielding frame can be spaced apart from any structure of the diffusion film and the substrate, namely There is a gap between the light-shielding frame and the diffusion film or substrate; or the light-shielding frame is spaced apart from the diffusion film and the substrate at the same time, that is, there is a gap between the light-shielding frame and the diffusion film and the substrate at the same time. The above structures are all within the protection scope of the present invention Among other things, the advantage of this design is that part of the light emitted by the LED light-emitting unit enters the diffusion film from the gap, which can further reduce the area of the gap of the light-shielding frame, thereby increasing the filling rate of the LED display.

Example two

6 is a schematic diagram of the structure of the shading frame of the LED display screen according to the second embodiment of the present invention. The shading frame is composed of a plurality of shading units; each shading unit is provided with an LED light-emitting unit; the center of the LED light-emitting unit coincides with the center of the shading unit , An optical diffusion film is attached to the light exit side of each shading unit; wherein the light entrance side and the light exit side of the shading frame correspond to different wall thicknesses, and the wall thickness of the regular six-sided shading frame is gradually from the light entrance side to the light exit side Decrease; the wall thickness corresponding to the light incident side of the shading frame is w2, and the range of w2 is 0.7mm-1.2mm, the wall thickness of the light emitting side of the shading frame is w1, and the range of w1 is 0.2mm-0.5mm; The side wall of the light-shielding frame structure has an inclination angle δ, the side wall of the light-shielding frame structure has an inclination angle δ of 3°-5°, the height of the light-shading frame is t, and the range of t is 3mm-6mm; The side wall of the light-shielding frame structure is provided with a diffuse reflection layer, the reflectivity of the diffuse reflection layer is 60%-95%, preferably 80%-90%; the light diffusion angle of the diffuse reflection layer is 50°-90° ; More preferably 80°-90°. The light area on the light entrance side corresponding to each shading unit is smaller than the light area on the light exit side; that is, the wall thickness w1 on the light exit side in FIG. 8 is smaller than the wall thickness w2 on the light entrance side. The inner side wall is used to reflect the light emitted by the LED light-emitting unit on the light-exit side of the regular hexagonal frame structure; the difference between the second embodiment and the first embodiment is that the wall thickness of the light-incident side and the light-exit side of the light-shielding frame are different. As mentioned above, the light-shielding frame also acts as a support for the diffusion film in the present invention, so the wall thickness of the light-shielding frame cannot be infinitely small, and the structure of the second embodiment with different thicknesses on the light entrance side and the light exit side wall can solve this well. The problem is that the side of the light-shielding frame adjacent to the substrate has a large thickness, which can ensure the reliability of the support of the light-shielding frame on the diffusion film, and the side adjacent to the diffusion film has a small thickness, which can further increase the filling rate of the LED display.

At this time, the wall thickness w1 of the light-emitting side of the LED display screen is in the range of 0.2-0.4mm; the side length a of the regular hexagonal shading frame is 2.69mm, which is brought into the calculation formula of the filling rate

The achievable filling rate range is 82.8%-91.4%. Compared with the first embodiment, the filling rate is greatly improved, and the inclined light-shielding frame is equivalent to a conical integrator rod, which can further compress the diffusion angle of the light emitted by the LED display screen, thereby reducing light crosstalk.

In addition, it should be noted that the connection between the light-shielding frame and the diffusion film and the substrate in this embodiment is not limited to the direct connection shown in FIG. 7. It can be understood that the light-shielding frame can be spaced apart from any structure of the diffusion film and the substrate, namely There is a gap between the light-shielding frame and the diffusion film or substrate; or the light-shielding frame is spaced apart from the diffusion film and the substrate at the same time, that is, there is a gap between the light-shielding frame and the diffusion film and the substrate at the same time. The above structures are all within the protection scope of the present invention Among other things, the advantage of this design is that part of the light emitted by the LED light-emitting unit enters the diffusion film from the gap, which can further reduce the area of the gap of the light-shielding frame, thereby increasing the filling rate of the LED display.

The following analysis of the positional relationship between the specific LED light-emitting unit and the regular six-sided light-shielding frame illustrates the color difference of the LED display at different viewing angles, including two specific embodiments. Taking the LED light-emitting unit of the LED display including RGB light-emitting chips as an example, the first The arrangement direction of the RGB light-emitting chips of the embodiment is perpendicular to the side length of the regular six-sided light-shielding frame, as shown in FIG. 8; the arrangement direction of the RGB three-color light-emitting chips of the second embodiment is parallel to the side length of the regular six-sided light-shielding frame, as shown in Fig. 9 Shown.

Generally, the positional relationship between the LED light-emitting unit and the light-shielding frame will have a certain influence on the parallax. The specific analysis is as follows.

Define the color difference du’v’ of the LED display from different viewing angles as

Among them, u'and v'are the color coordinates in the CIELUV color coordinate system, u'ref and v'ref are the color coordinates when the viewing angle is 0°. In Figure 8 and Figure 9, the horizontal axis is the deviation from the normal line of the LED display ( The normal line corresponds to the viewing angle of 0 degrees), and the vertical axis is the color deviation Du'v'. The larger the value of Du'v', the greater the color difference between the light at the measurement angle and the light at 0 degrees. It should be noted that the horizontal viewing angle or vertical viewing angle here is based on the center position of the LED display, that is, the horizontal viewing angle or vertical viewing angle corresponding to the center position is 0°, and the center position is horizontally to the left and right of the LED display. The horizontal viewing angle on the side gradually increases, and the longitudinal viewing angle from the center position along the vertical direction to the upper and lower sides of the LED display gradually increases.

The results of the chromatic aberration distribution of the two arrangements along each viewing angle obtained through simulation calculation are shown in Figure 8 and Figure 9. In the simulation calculation, the spacing p of the regular hexagonal light-shielding frame is 5mm, and the wall thickness of the light-emitting side of the regular hexagonal light-shading frame is w1 0.5mm, the inclination angle δ of the shading frame is 3.2°, and the height t of the shading frame is 5mm. It can be seen that the chromatic aberration values under both the horizontal viewing angle and the vertical viewing angle are kept at a small value, which does not affect viewing. Among them, when the RGB chips are arranged perpendicularly along the side length of the regular six-sided light-shielding structure, the difference of the visual roles is smaller, which is the preferred arrangement.

From the above analysis, it can be understood that the positional relationship between the LED light-emitting unit and the light-shielding frame does not cause chromatic aberration in the viewing angle of the LED display screen, that is, the LED light-emitting unit can be arranged at any position in the six-sided light-shielding frame.

In summary, the present invention provides an LED display screen. By arranging a regular six-sided light-shielding frame, the light-shielding frame has a smaller bonding interval with the diffusion film, which further increases the light filling rate of the LED display and improves the optics of the LED display. display effect. The LED display can be applied to scenes such as theaters, living rooms, office spaces, and billboards.

The present invention is not limited to the above-mentioned optional embodiments, and anyone can derive other products in various forms under the enlightenment of the present invention. The above-mentioned specific embodiments should not be construed as limiting the protection scope of the present invention, and the protection scope of the present invention should be defined in the claims, and the description can be used to interpret the claims.

Claims

An LED display screen, characterized in that it comprises:

The LED array includes a plurality of LED light-emitting units, and the LED light-emitting units are arranged on a substrate;

The diffusion film is arranged on the light emitting side of the LED array;

The regular six-sided light-shielding frame is arranged between the LED array and the diffusion film, and includes a hollow grid array including a plurality of hollow grids, and the hollow grids correspond to the LED light-emitting units one-to-one, and the The projection of the hollow grid on the substrate surrounds its corresponding LED light-emitting unit.
The LED display screen according to claim 1, wherein the wall thickness of the light-incident side and the light-exit side of the regular six-sided light-shielding frame are the same.
The LED display screen according to claim 2, wherein the wall thickness of the regular hexagonal light-shielding frame ranges from 0.2mm to 1.2mm, preferably 0.3mm to 0.7mm.
The LED display screen according to claim 1, wherein the wall thickness of the light-incident side and the light-exit side of the regular six-sided light-shielding frame are different, and the wall thickness of the regular six-sided light-shielding frame is from the light-incident side to The light-emitting side gradually decreases.
The LED display screen of claim 4, wherein the wall thickness of the light-incident side of the regular six-sided light-shielding frame is w2, and the size range of w2 is 0.7mm-1.2mm.
The LED display screen of claim 5, wherein the wall thickness of the light-emitting side of the regular hexagonal light-shielding frame is w1, and the size of w1 ranges from 0.2 mm to 0.5 mm.
The LED display screen according to claim 4, wherein the side wall of the regular hexagonal light-shielding frame has an inclination angle, and the inclination angle ranges from 3° to 5°.
The LED display screen of claim 1, wherein the height of the regular six-sided light-shielding frame is t, and the size of t is in the range of 3mm-6mm.
The LED display screen of claim 1, wherein the side wall of the regular hexagonal light-shielding frame is provided with a light reflection layer or a light absorption layer.
The LED display screen according to claim 1, wherein the regular hexagonal shading frame is manufactured by 3D printing, injection molding or splicing crisscross shading strips.
The LED display screen according to any one of claims 1-10, wherein the LED light-emitting unit comprises RGB light-emitting chips, and the arrangement of the RGB light-emitting chips is perpendicular to or parallel to the side length of the regular six-sided light-shielding frame On the side length of the regular six-sided light-shielding frame.