LED display screen

Abstract

The LED display screen comprises an LED lamp bead array and a matrix shading frame, the matrix shading frame is arranged on the light emitting side of the LED lamp bead array, the LED lamp bead array comprises a plurality of LED lamp beads, each LED lamp bead comprises a first light-emitting chip, a second light-emitting chip and a third light-emitting chip, and the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are arranged on the matrix shading frame. The first light-emitting chip, the second light-emitting chip and the third light-emitting chip are symmetrically distributed relative to the center of the LED lamp bead. According to the LED display screen, the pixel filling rate of the LED display screen is improved by using the diffusion film, mutual crosstalk among pixels is avoided by using the matrix shading frame, and the problem of chromatic aberration generated when the LED display screen is watched at different angles is effectively solved by arranging the LED lamp beads which are distributed in a central symmetry mode.

Description

[0001] This application is a divisional application of application number CN201811137812.5, application date September 28, 2018, and invention name “LED display screen”. Technical Field

[0002] The invention relates to an LED display screen, and belongs to the technical field of LED display screen manufacturing. Background Art

[0003] LED lamps are characterized by high luminance. Large screens composed of LED arrays offer high brightness (over 1000 nits) and high display uniformity, resulting in superior viewing quality compared to projection. LED array displays also offer other advantages, such as the fast response of each LED, which can be individually controlled to illuminate and deactivate, allowing for complete shutdown during black scenes, resulting in high contrast. Furthermore, LED arrays have a narrow spectrum, maintaining a wide color gamut even at high brightness.

[0004] However, there is a problem with current LED array displays: although setting up a light shield can prevent crosstalk between pixels, it will cause color difference problems.

[0005] Figure 1 This is a schematic diagram of the structure of a traditional LED lamp bead; Figure 2 This is an oblique view of the structure of a traditional LED lamp bead. Figure 1 and Figure 2 As shown, traditional LED lamp beads usually include three-color light-emitting chips arranged in a straight line: a first light-emitting chip 11 (for example, a red light-emitting chip), a second light-emitting chip 12 (for example, a green light-emitting chip) and a third light-emitting chip 13 (a blue light-emitting chip). Since the three-color light-emitting chips are arranged in a straight line, the distances between them and the light-shielding frame are different. Therefore, when the LED lamp beads are observed from an oblique direction, the first light-emitting chip 11, the second light-emitting chip 12 and the third light-emitting chip 13 are at different distances from the light-shielding frame. Therefore, the light-shielding frame has different degrees of blocking for the first light-emitting chip 11, the second light-emitting chip 12 and the third light-emitting chip 13, and the light directly emitted from the light-emitting chip without passing through the light-shielding frame has a greater light intensity. Therefore, when watching a screen composed of traditional LED lamp beads, there will be color difference under a certain viewing angle, and the color tends to the light-emitting color of the light-emitting chip with a lesser degree of blocking. Figure 3 for Figure 2 The luminous intensity distribution diagram of traditional LED lamp beads in the state, Figure 3 From left to right, the luminous intensity distribution of the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 is shown. As can be seen from the figure, the luminous distribution of the three light-emitting chips is different, and the longitudinal angular distribution of red and blue light is inconsistent. u' and v' are defined as the color coordinates in the CIE-LUV color coordinate system. u' ref and v'ref is the color coordinate at 0° viewing angle, then the color difference du'v' is

[0006]

[0007] When viewers watch a screen composed of traditional LED lamp beads at a wide viewing angle, they will notice color difference. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide an LED display screen in response to the shortcomings of the existing technology. The pixel fill rate of the LED display screen is improved by using a diffusion film, and crosstalk between pixels is avoided by using a matrix light shielding frame. The color difference problem caused by viewing the LED display screen at different angles is effectively solved by arranging LED lamp beads in a centrally symmetrical distribution.

[0009] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0010] The present invention provides an LED display screen, which includes an LED lamp bead array and a matrix light shielding frame. The matrix light shielding frame is arranged on the light-emitting side of the LED lamp bead array. The LED lamp bead array includes multiple LED lamp beads. The LED lamp beads include a first light-emitting chip, a second light-emitting chip, and a third light-emitting chip. The first light-emitting chip, the second light-emitting chip, and the third light-emitting chip are symmetrically distributed relative to the center of the LED lamp bead.

[0011] To eliminate color difference, the first light-emitting chip is one of a red light-emitting chip, a green light-emitting chip, and a blue light-emitting chip, the second light-emitting chip is another of the red light-emitting chip, the green light-emitting chip, and the blue light-emitting chip, and the third light-emitting chip is the last of the red light-emitting chip, the green light-emitting chip, and the blue light-emitting chip.

[0012] Preferably, the number of the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are all two, and the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are arranged in a matrix in the form of three rows and two columns, with the first row containing the first light-emitting chip and the third light-emitting chip, the second row containing the second light-emitting chip, and the third row containing the third light-emitting chip and the first light-emitting chip.

[0013] Preferably, the first light-emitting chip, the second light-emitting chip, and the third light-emitting chip are arranged in an "X" shape. There are two first light-emitting chips and two third light-emitting chips, and one second light-emitting chip is located in the center. One first light-emitting chip, the second light-emitting chip, and the third light-emitting chip are located in a straight line, and another first light-emitting chip, another third light-emitting chip, and the second light-emitting chip are located in another straight line, and the two straight lines intersect each other to form an "X" shape.

[0014] Preferably, the plurality of LED lamp beads are arranged in a rectangular array on the substrate.

[0015] In order to reduce the reflection of ambient light, a black light absorbing layer is coated on the side of the substrate where the LED lamp beads are arranged.

[0016] Preferably, the matrix light shielding frame is provided with a plurality of hollow grids, the number of the hollow grids is the same as the number of LED lamp beads, and each of the LED lamp beads is arranged corresponding to the center of the hollow grid.

[0017] To facilitate molding, the thickness of the side walls of the hollow grid gradually decreases in a direction away from the LED lamp bead array.

[0018] In order to increase the pixel filling rate, the LED display screen further includes a diffusion film, which is arranged on a side of the matrix light shielding frame away from the LED lamp bead array.

[0019] Preferably, the diffusion membrane is a surface diffusion membrane, a body diffusion membrane or a double-layer laminated diffusion membrane, and the double-layer laminated diffusion membrane consists of a hard plate and a diffusion layer.

[0020] Preferably, the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are individually packaged to form an LED lamp bead.

[0021] Preferably, the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are integrally packaged to form an LED lamp bead.

[0022] The present invention uses a diffusion film to improve the pixel fill rate of the LED display screen, uses a matrix light shielding frame to avoid crosstalk between pixels, and effectively solves the color difference problem caused by viewing the LED display screen at different angles by arranging LED lamp beads in a centrally symmetrical distribution.

[0023] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a traditional LED lamp bead;

[0025] Figure 2 This is an oblique view of the structure of a traditional LED lamp bead;

[0026] Figure 3 for Figure 2 Luminous intensity distribution diagram of traditional LED lamp beads in the state;

[0027] Figure 4 This is an exploded view of the structure of the LED display screen of the present invention;

[0028] Figure 5 A cross-sectional view of a single pixel of the LED display screen of the present invention;

[0029] Figure 6 This is a cross-sectional view of an LED lamp bead integrally packaged with a light-emitting chip according to the present invention;

[0030] Figure 7 This is a cross-sectional view of an LED lamp bead with a light-emitting chip individually packaged according to the present invention;

[0031] Figure 8 This is a cross-sectional view of the light distribution of the LED lamp bead of the present invention;

[0032] Figure 9 This is a cross-sectional view of the light distribution of the LED lamp bead of the present invention;

[0033] Figure 10 This is a front view of a single pixel of an LED display screen according to an embodiment of the present invention;

[0034] Figure 11 This is a horizontal oblique view of a single pixel of an LED display screen according to an embodiment of the present invention;

[0035] Figure 12 This is a longitudinal oblique view of a single pixel of an LED display screen according to an embodiment of the present invention;

[0036] Figure 13 for Figure 12 Luminous intensity distribution diagram of LED lamp beads in the state;

[0037] Figure 14 This is a front view of a single pixel of an LED display screen according to an embodiment of the present invention;

[0038] Figure 15 This is a horizontal oblique view of a single pixel of an LED display screen according to an embodiment of the present invention;

[0039] Figure 16 This is a longitudinal oblique view of a single pixel of an LED display screen according to an embodiment of the present invention;

[0040] Figure 17 for Figure 16 The luminous intensity distribution diagram of LED lamp beads in the state.

[0041] [Description of Reference Numerals]

[0042] LED lamp array 100

[0043] Diffusers 101

[0044] Matrix light shielding frame 102

[0045] Hollow grid 103

[0046] LED lamp beads 10

[0047] The first light-emitting chip 11

[0048] The second light-emitting chip 12

[0049] The third light-emitting chip 13

[0050] Reflective layer 123

[0051] Reflective layer 1022 DETAILED DESCRIPTION

[0052] Figure 4 This is an exploded view of the structure of the LED display screen of the present invention; Figure 5 : is a cross-sectional view of a single pixel of the LED display screen of the present invention. Figure 4 and Figure 5 As shown, the present invention provides an LED display screen, which includes an LED lamp bead array 100, a matrix light shielding frame 102 and a diffusion film 101. The diffusion film 101 is arranged on the light-emitting side of the LED lamp bead array 100, and the matrix light shielding frame 102 is arranged between the LED lamp bead array 100 and the diffusion film 101, that is, the matrix light shielding frame 102 is arranged on the light-emitting side of the LED lamp bead array 100.

[0053] The LED lamp bead array includes a substrate and a driving circuit, a driving chip and a plurality of LED lamp beads 10 arranged on the substrate. The substrate can be a PCB (Printed Circuit Board) circuit board, and the LED lamp beads 10 include a first light-emitting chip 11, a second light-emitting chip 12 and a third light-emitting chip 13, preferably an LED chip in which the first light-emitting chip 11, the second light-emitting chip 12 and the third light-emitting chip 13 are packaged together, each LED lamp bead represents a pixel, and the plurality of LED lamp beads are preferably arranged in a rectangular array on the PCB circuit board. In order to reduce the reflection of ambient light, a black light-absorbing layer is coated on the side of the substrate where the LED lamp beads 10 are arranged. The LED lamp beads can be fixed on the substrate by reflow soldering or the like, and the driving circuit and the driving chip are used to control the brightness of the first light-emitting chip 11, the second light-emitting chip 12 and the third light-emitting chip 13 in the LED lamp beads 10.

[0054] The first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 each have different colors. Preferably, the first light-emitting chip 11 is one of red, green, and blue, the second light-emitting chip 12 is another of red, green, and blue, and the third light-emitting chip 13 is the last of red, green, and blue. In other words, the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 each have different colors and are interchangeable.

[0055] It should be added that the first light-emitting chip 11, the second light-emitting chip 12 and the third light-emitting chip 13 in the LED lamp bead 10 may not be packaged together, but each color of the light-emitting chip may be packaged separately, and the three separately packaged light-emitting chips constitute an LED lamp bead. Figure 6 This is a cross-sectional view of an LED lamp bead integrally packaged with a light-emitting chip according to the present invention; Figure 7 This is a cross-sectional view of an LED lamp bead with a light-emitting chip individually packaged according to the present invention. Figure 6 As shown, the first light emitting chip 11, the second light emitting chip 12 and the third light emitting chip 13 are packaged together to form an LED lamp bead. In order to increase the mixing effect of different colors, the first light emitting chip 11, the second light emitting chip 12 and the third light emitting chip 13 are surrounded by a reflective layer 123. Figure 7 As shown, the light-emitting chip is packaged separately. This structure is generally used when the distribution area of ​​the LED light-emitting chip is large, such as when the distribution area is larger than 3*3mm 2 This structure can be selected when

[0056] To increase the pixel fill rate of the LED display and reduce the negative viewing experience caused by noticeable graininess, the LED display further includes a diffusion film 101. This diffusion film 101 is positioned on the side of the matrix light shielding frame 102 away from the LED lamp array 100, i.e., on the light-emitting side of the matrix light shielding frame 102. The diffusion film 101 can be a surface diffusion film or a body diffusion film, or it can be a double-layer laminated diffusion film consisting of a hard plate such as an acrylic plate or a glass plate and a diffusion layer, wherein the diffusion layer is positioned on the outside, i.e., on the side away from the LED lamp array 100. Light emitted by the LED lamp array 100 strikes the diffusion film 101, and the pixels formed on the diffusion film 101 correspond one-to-one with the LED lamp beads 10 in the LED lamp array 100.

[0057] Figure 8 This is a cross-sectional view of the light distribution of the LED lamp bead of the present invention; Figure 9 This is a cross-sectional view of the light distribution of the LED lamp bead of the present invention. Figure 8 and Figure 9As shown, since the pixel fill rate is defined as the ratio of the light-emitting area of the LED lamp beads to the pixel area, when a diffusion film is covered on the surface of the LED lamp beads and the distance between the LED lamp beads and the diffusion film is h, the method for determining the light-emitting area is as follows: Take the light spot corresponding to a single pixel, and its central illuminance value is L. Then, the area of the light spot where the illuminance value of the light spot is not less than aL is the light spot area (i.e., the light-emitting area) of the pixel, where 0 < a < 0.5. For the pitch p between adjacent LED lamp beads, since the illumination area on the surface of the diffusion film can be defined by the light spot radius r (or the light spot diameter D), the pixel fill rate can be defined as the ratio of the light spot area to the pixel area:

[0058]

[0059] The light emitted by the LED lamp beads 10 irradiates on the diffusion film 101 to form a light spot larger than the area of the LED lamp beads, so that the pixel matrix on the diffusion film 101 has a higher pixel fill rate than the pixel matrix of the LED lamp beads. In other words, when the diffusion film 101 is not provided, when the viewer views the screen composed of the LED lamp bead array, what is seen are multiple LED lamp beads 10. After the diffusion film 101 is provided, when the viewer views the screen including the LED lamp bead array and the diffusion film, what is seen is the entire diffusion film 101, and its pixel fill rate is significantly increased. In addition, after the light passes through the diffusion film 101, the angle expands, so that the LED display screen with the diffusion film 101 has a larger viewing angle. Specifically, the diffusion film 101 is adhered to the matrix light-shielding frame 102 through a transparent ultraviolet glue, and the diffusion angle of the diffusion film 101 is 30° of transverse Gaussian * 15° of longitudinal Gaussian.

[0060] The matrix light shielding frame 102 is used to block crosstalk from adjacent LED beads 10. The matrix light shielding frame 102 is provided with a plurality of hollow grids 103. The number of hollow grids 103 is the same as the number of LED beads 10. Each LED bead 10 is positioned corresponding to the center of a hollow grid 103. That is, in a direction perpendicular to the substrate, the center of the LED bead 10 coincides with the center of the hollow grid 103. The center of the LED bead 10 also coincides with the center of the pixel. It should be noted that, considering other factors such as processing accuracy, the overlap described here is allowed to have a certain error. Even when there is a certain error, the color difference problem can still be solved. The matrix light shielding frame 102 can be made of metal or plastic. Its inner surface is coated with an absorption layer, a reflective layer, or a scattering layer to prevent crosstalk. For example, a high-reflectivity paint with a Gaussian scattering angle of 15° can be coated on the sidewalls of the matrix light shielding frame as the reflective layer 1022. This confines the light emitted by each LED bead 10 to propagate within the hollow grid 103. The hollow grid 103 of the matrix light shielding frame 102 can be circular or rectangular, preferably square. To facilitate molding, the sidewall thickness of the hollow grid 103 gradually decreases as it moves away from the LED lamp array 100. That is, the width w of the sidewall of the hollow grid 103 closer to the LED lamp array 100 is greater than the width g of the sidewall farther away from the LED lamp array 100. Preferably, the sidewall cross-section of the hollow grid 103 is trapezoidal. The matrix light shielding frame 102 can be fixedly connected to the LED lamp array 100 using a snap-fit ​​mechanism or other means.

[0061] To reduce the color difference caused by viewers viewing the LED display at different angles, the first, second, and third light-emitting chips in the LED lamp bead 10 are arranged in a specific pattern to eliminate the color difference of the light emitted by the light-emitting chips at certain viewing angles. Specifically, the first, second, and third light-emitting chips 11, 12, and 13 are symmetrically distributed relative to the center of the LED lamp bead. A centrally symmetrical figure is a figure that can be rotated 180° around a point in a plane. If the rotated figure can overlap with the original figure, then this figure is called a centrally symmetrical figure, and this point is called its center of symmetry. In the present invention, the first, second, and third light-emitting chips 11, 12, and 13 are symmetrically distributed relative to the center of the LED lamp bead. Therefore, in other words, in the present invention, the first, second, and third light-emitting chips 11, 12, and 13 are arranged in a centrally symmetrical pattern, and the colors of the first, second, and third light-emitting chips 11, 12, and 13 cannot all be the same. In the prior art, the color positions of multiple light-emitting chips arranged in a straight line change after rotation, making them unable to overlap, and thus they are not centrally symmetrical figures. Experiments have shown that LED lamp beads with a centrally symmetrical structure have a symmetrical distribution of luminous intensity in the horizontal and vertical directions. Specifically, the above structure can ensure that the color difference du'v' is consistently less than 0.008 within the range of ±70° horizontally and ±50° vertically, meaning that the viewer cannot notice the color difference.

[0062] The structure of the LED lamp bead 10 in the present invention is described in detail below with reference to specific embodiments.

[0063] Example 1

[0064] Figure 10 This is a front view of a single pixel of an LED display screen according to an embodiment of the present invention; Figure 11 This is a horizontal oblique view of a single pixel of an LED display screen according to an embodiment of the present invention; Figure 12 This is a vertical oblique view of a single pixel of an LED display screen according to an embodiment of the present invention. Figures 5 to 12 As shown, in this embodiment, the LED lamp bead includes two first light-emitting chips 11, two second light-emitting chips 12, and two third light-emitting chips 13. The spacing p between the LED lamp beads is 2.5 mm. The LED lamp bead uses SMT (surface mount technology) packaging. The size of the packaged LED lamp bead is 1.5 mm × 1.5 mm. The side length d of the light-emitting chip is 0.001 mm to 1 mm, preferably 0.1 mm to 0.3 mm.

[0065] Specifically, the first light-emitting chip 11, the second light-emitting chip 12 and the third light-emitting chip 13 are arranged in a matrix of three rows and two columns. The first row from left to right is the first light-emitting chip 11 and the third light-emitting chip 13, the second row is all the second light-emitting chip 12, and the third row from left to right is the third light-emitting chip 13 and the first light-emitting chip 11.

[0066] like Figure 11 As shown, when the LED lamp beads are observed horizontally (L direction), one of the first light-emitting chip 11, the second light-emitting chip 12 and the third light-emitting chip 13 is blocked by the matrix light shielding frame 102, which does not affect the color balance. Figure 12 As shown, when observing the LED lamp bead in the longitudinal direction (V direction), one light-emitting chip each of the first light-emitting chip 11 and the third light-emitting chip 13 is blocked by the matrix light-shielding frame 102, which also does not affect the color balance.

[0067] Figure 13 for Figure 12 The luminous intensity distribution diagram of LED lamp beads in the state. Figure 13 The luminous intensity distributions of the first light-emitting chip 11 , the second light-emitting chip 12 and the third light-emitting chip 13 are shown from left to right. As can be seen from the figure, in the vertical viewing angle, the luminous intensity angular distributions of the red, green and blue light-emitting chips are symmetrical.

[0068] In this embodiment, the matrix light shielding frame 102 is made of polycarbonate (PC), and the inner surface of the side wall is coated with a diffuse reflection layer with a Gaussian scattering angle of 20° and a reflectivity of 85%. Figure 5 The width w of the sidewall of the hollow grid 103 close to the LED array 100 is 2.2 mm, the width g of the sidewall away from the LED array 100 is 1.3 mm, and the height h of the matrix light shielding frame 102 is 3 mm. The light shielding frame is fixed to the weld between the base plate and the LED beads by snaps.

[0069] Example 2

[0070] Figure 14 This is a front view of a single pixel of an LED display screen according to an embodiment of the present invention; Figure 15 This is a horizontal oblique view of a single pixel of an LED display screen according to an embodiment of the present invention; Figure 16 This is a longitudinal oblique view of a single pixel of an LED display screen according to an embodiment of the present invention; Figure 17 for Figure 16 The luminous intensity distribution diagram of the LED lamp beads in the state. Figures 14 to 16As shown, in this embodiment, the LED lamp bead includes two first light-emitting chips 11 and two third light-emitting chips 13, and one second light-emitting chip 12. The spacing p between the LED lamp beads is 5 mm. The LED lamp bead uses SMT (surface mount technology) packaging. The packaged LED lamp bead has a size of 2.5 mm × 2.5 mm, and the side length d of the light-emitting chip is 0.001 mm to 1 mm, preferably 0.1 mm to 0.3 mm.

[0071] Specifically, the first light-emitting chip 11, the second light-emitting chip 12 and the third light-emitting chip 13 are arranged in an "X" shape, wherein the second light-emitting chip 12 is located in the center, one first light-emitting chip 11, the second light-emitting chip 12 and a third light-emitting chip 13 are located on a straight line, another first light-emitting chip 11, another third light-emitting chip 13 and the second light-emitting chip 12 are located on another straight line, and the two straight lines intersect each other in an "X" shape.

[0072] like Figure 15 As shown, when the LED lamp beads are observed horizontally (L direction), one of the first light-emitting chip 11 and the third light-emitting chip 13 is blocked by the matrix light shielding frame 102, which does not affect the color balance. Figure 16 As shown, when observing the LED lamp bead in the longitudinal direction (V direction), one light-emitting chip each of the first light-emitting chip 11 and the third light-emitting chip 13 is blocked by the matrix light-shielding frame 102, which also does not affect the color balance.

[0073] Figure 17 for Figure 16 The luminous intensity distribution diagram of LED lamp beads in the state. Figure 17 The luminous intensity distributions of the first light-emitting chip 11 , the second light-emitting chip 12 and the third light-emitting chip 13 are shown from left to right. As can be seen from the figure, in the vertical viewing angle, the luminous intensity angular distributions of the red, green and blue light-emitting chips are symmetrical.

[0074] In this embodiment, the matrix light shielding frame 102 is made of polycarbonate (PC), and the inner surface of the side wall is coated with a diffuse reflection layer with a Gaussian scattering angle of 15° and a reflectivity of 50% to 95%, preferably 95%. Figure 5 The width w of the side wall of the hollow grid 103 close to the LED array 100 is 1.2 mm, the width g of the side wall away from the LED array 100 is 0.5 mm, and the height h of the matrix light shielding frame 102 is 5 mm. The light shielding frame is fixed to the weld between the base plate and the LED beads by snaps.

[0075] It should be noted that the embodiments described above are only a portion of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. For example, the light-emitting chip with a three-row and two-column matrix arrangement structure in Example 1 is defined as Structure 1, and the "X"-shaped light-emitting chip in Example 2 is defined as Structure 2. A centrally symmetrical figure composed of multiple Structures 1 and / or Structure 2 can also be used as an embodiment of the present invention.

[0076] In summary, the present invention uses a diffusion film to improve the pixel fill rate of the LED display screen, uses a matrix light shielding frame to avoid crosstalk between pixels, and effectively solves the color difference problem caused by viewing the LED display screen at different angles by arranging LED lamp beads in a centrally symmetrical distribution.

Claims

1. An LED display screen, characterized in that: The LED display screen includes an LED lamp bead array and a matrix light-shielding frame, the matrix light-shielding frame is arranged on the light-emitting side of the LED lamp bead array, the LED lamp bead array includes multiple LED lamp beads, and the LED lamp beads include a first light-emitting chip, a second light-emitting chip and a third light-emitting chip, and the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are symmetrically distributed relative to the center of the LED lamp bead; the matrix light-shielding frame is provided with multiple hollow grids, and each of the LED lamp bead is arranged corresponding to the center of the hollow grid; the colors of the first light-emitting chip, the second light-emitting chip and the third light-emitting chip cannot all be the same; the number of the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are all two, and the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are arranged in a matrix in the form of three rows and two columns, the first row is the first light-emitting chip and the third light-emitting chip, the second row is the second light-emitting chip, and the third row is the third light-emitting chip and the first light-emitting chip.

2. The LED display screen according to claim 1, wherein: The first light-emitting chip is one of a red light-emitting chip, a green light-emitting chip and a blue light-emitting chip, the second light-emitting chip is another of the red light-emitting chip, the green light-emitting chip and the blue light-emitting chip, and the third light-emitting chip is the last of the red light-emitting chip, the green light-emitting chip and the blue light-emitting chip.

3. The LED display screen according to claim 2, characterized in that: The plurality of LED lamp beads are arranged on the substrate in a rectangular array.

4. The LED display screen according to claim 3, characterized in that: The substrate is coated with a black light absorbing layer on the side where the LED lamp beads are arranged.

5. The LED display screen according to claim 3, characterized in that: The number of the hollow grids is the same as the number of LED lamp beads.

6. The LED display screen according to claim 5, characterized in that: The thickness of the side walls of the hollow grid gradually decreases in a direction away from the LED lamp bead array.

7. The LED display screen according to claim 1, wherein: The LED display screen further comprises a diffusion film, which is arranged on a side of the matrix light shielding frame away from the LED lamp bead array.

8. The LED display screen according to claim 7, characterized in that: The diffusion film is a surface diffusion film, a body diffusion film or a double-layer laminated diffusion film, and the double-layer laminated diffusion film is composed of a hard plate and a diffusion layer.

9. The LED display screen according to claim 1, wherein: The first light-emitting chip, the second light-emitting chip and the third light-emitting chip are individually packaged to form an LED lamp bead, or the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are integrally packaged to form an LED lamp bead.

10. The LED display screen according to claim 1, wherein: An absorption layer, a reflection layer or a scattering layer for preventing crosstalk is coated on the inner side of the matrix light shielding frame.

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