Display module

Abstract

This utility model discloses a display module, which includes a PCB board, multiple LED beads, a potting compound layer, and an optical structure layer. The multiple LED beads are arranged in an array on the PCB board. The potting compound layer is disposed on the side of the PCB board where the LED beads are located, and encapsulates the LED beads therein. The optical structure layer includes multiple optical structure units disposed on the side of the potting compound layer facing away from the PCB board, with one optical structure unit located between two adjacent rows of LED beads. In the display module of this utility model embodiment, the optical structure layer avoids severe ambient light interference caused by specular reflection due to the potting compound layer on the front of the LED board, effectively improving contrast and ensuring a better display effect.

Description

Technical Field

[0001] This utility model relates to the field of LED display technology, and in particular to a display module. Background Technology

[0002] Currently, the main packaging technologies for LED displays are GOB (Glue On the Board), such as... Figure 1 As shown, a special resin potting material is used to fill the gaps between LED beads 10 on the basis of traditional SMD labels, forming a potting layer 20, thereby tightly connecting each individual LED bead on the PCB board 30 to form a whole. This encapsulation method can greatly enhance the connection strength between the LED beads 10 and the PCB board 30, reducing the risk of bead detachment. Furthermore, GOB encapsulation technology can achieve comprehensive protection for the LED display, including waterproofing, moisture resistance, dustproofing, and impact resistance, enabling the LED display to operate more stably in various harsh environments. However, it also has certain drawbacks: the front of the GOB (encapsulation layer 20) is a flat surface, resulting in specular reflection that causes severe ambient light interference and a significant decrease in contrast; the continuous plane between GOB light boards exposes the module seams, leading to modularity issues; and the blackness and matte finish of the GOB light board in a black screen state are worse than those of a conventional mask-type light board. Utility Model Content

[0003] In view of the above problems, embodiments of the present invention are proposed to provide a display module that solves or at least partially solves the above problems.

[0004] This utility model embodiment provides a display module, which includes:

[0005] PCB board;

[0006] Multiple LED beads are arranged in an array on the PCB board;

[0007] A potting compound layer is provided on the side of the PCB board where the LED beads are located, and the LED beads are encapsulated therein;

[0008] An optical structure layer is disposed on the side of the potting compound layer facing away from the PCB board, and includes multiple optical structure units, with one optical structure unit located between two adjacent rows of LED beads.

[0009] Furthermore, an optical structure unit is also provided outside the two rows of LED beads located at the two side edges.

[0010] Furthermore, the end face of the optical structure unit is a micro-protrusion provided on the surface of the potting adhesive layer.

[0011] Furthermore, the height H of the micro-protrusion is 50-200 μm.

[0012] Furthermore, the width W of the micro-protrusion is 100-600 μm.

[0013] Furthermore, the surface of the micro-protrusion is formed by connecting multiple arc-shaped structures with different radii of curvature R end to end.

[0014] Furthermore, the radius of curvature R is 30-180 μm.

[0015] Furthermore, the optical properties of the material of the optical structural unit are that the haze value is greater than 90%.

[0016] Furthermore, the optical structure unit is located at the geometric center of two adjacent rows of LED beads.

[0017] Furthermore, a blackened surface layer is provided on the side of the potting compound layer facing away from the PCB board;

[0018] The optical structure unit is located on the side of the surface with the blackened layer facing away from the potting compound layer.

[0019] In the technical solution provided by this utility model embodiment, multiple LED beads are arranged in an array on a PCB board. A potting compound layer is disposed on the side of the PCB board on which the LED beads are disposed and encapsulates the LED beads therein. An optical structure layer includes multiple optical structure units disposed on the side of the potting compound layer away from the PCB board. An optical structure unit is provided between two adjacent rows of LED beads. By setting the optical structure layer, severe ambient light interference is avoided due to specular reflection caused by the front of the lamp board being a flat surface of the potting compound layer, effectively improving the contrast and ensuring that it has a better display effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional structural diagram of a display module in the prior art;

[0022] Figure 2 This is a cross-sectional structural diagram of a display module provided in an embodiment of the present utility model;

[0023] Figure 3This is a cross-sectional structural diagram of an optical structural unit of a display module provided in an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the embodiments of this utility model.

[0025] It should be noted that in the description of this utility model, if the terms "first" or "second" appear, they are only used for the convenience of describing different components or names, and should not be construed as indicating or implying a sequential relationship, relative importance, or implicitly specifying the number of technical features indicated. Therefore, a feature specified with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, if "and / or" appears throughout the text, it means that it includes three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0027] Please refer to Figure 1 This is a cross-sectional structural diagram of a display module in the prior art. The display module includes LED beads 10, a potting compound layer 20, and a PCB board 30. Multiple LED beads 10 are arranged in an array on one side of the PCB board 30, while the potting compound layer 20 is disposed on the side of the PCB board 30 where the LED beads 10 are located. It fills the gaps between the LED beads, tightly connecting each individual LED bead to form a single package. In this structure, the encapsulation surface is the plane of the potting compound layer 20, which can cause specular reflection and is easily affected by ambient light, resulting in decreased contrast and thus affecting the display effect.

[0028] Please combine Figure 2This is a cross-sectional structural diagram of a display module provided by an embodiment of the present invention. The display module includes LED beads 10, a potting compound layer 20, a PCB board 30, and an optical structure layer 40. Multiple LED beads 10 are arranged in an array on one side of the PCB board 30, and the potting compound layer 20 is disposed on the side of the PCB board 30 where the LED beads 10 are located, encapsulating the LED beads 10 therein. Unlike the prior art, the display module also includes the optical structure layer 40, which includes multiple optical structure units 410. These optical structure units 410 are disposed on the side of the potting compound layer 20 facing away from the PCB board 30, and an optical structure unit 410 is provided between two adjacent rows of LED beads 10. It can be understood that the multiple optical structure units 410 are disposed above the potting compound layer 20, and the optical structure units 410 and the rows of LED beads 10 are staggered.

[0029] In this embodiment of the present invention, by providing the optical structure layer 40 above the potting adhesive layer 20, the display surface of the display module is no longer a flat adhesive plane. When the display module is in a complex ambient light environment, specular reflection will not occur, effectively improving the contrast of the display surface and ensuring that the display module has a better display effect.

[0030] Furthermore, in other preferred embodiments of this utility model, an optical structure unit 410 is also provided outside the two rows of LED beads 10 located at the two side edges.

[0031] Specifically, an optical structure unit 410 is also provided outside the outermost row of LED beads 10. That is, the optical structure unit 410 is not located between two adjacent rows of LED beads 10, but is located at the two sides of the potting compound layer 20, as shown in the figure. The optical structure unit 410 here can provide good protection for the inner LED beads 10, preventing them from being damaged by bumps.

[0032] In addition, when two display modules are spliced ​​together, there will be a noticeable seam at the connection between the modules, which will affect the display effect of the display module. In other preferred embodiments of this utility model, a corresponding baffle can be added at the seam to improve the display effect.

[0033] Furthermore, please combine Figure 3 In other preferred embodiments of the present invention, the end face of the optical structure unit 410 is a micro-protrusion 4101 provided on the surface of the potting adhesive layer 20.

[0034] Specifically, the optical structure unit 410 is arranged along the length of the row of LED beads 10, and its end face is the micro protrusion 4101 disposed on the surface of the potting adhesive layer 20. The shape of the micro protrusion 4101 includes, but is limited to, a semi-circle or an arch shape. The micro protrusion 4101 of this shape can make the display surface of the display module have an uneven structure, thus avoiding specular reflection.

[0035] Furthermore, in other preferred embodiments of this invention, the height H of the micro-protrusion 4101 is 50-200 μm.

[0036] Preferably, the height H of the micro-protrusion 4101 is 100 μm.

[0037] In other preferred embodiments of this invention, the width W of the micro-protrusion 4101 is 100-600 μm.

[0038] Furthermore, in other preferred embodiments of the present invention, the plurality of micro-protrusions 4101 are distributed at equal intervals on the potting adhesive layer 20.

[0039] Furthermore, in other preferred embodiments of this invention, the optical structure unit 410 is located at the geometric center of two adjacent rows of LED beads 10.

[0040] Specifically, the spatial arrangement of the multiple micro-protrusions 4101 varies with the arrangement density of the LED beads 10, and the optical structure unit 410 is located directly above the center point of two adjacent rows of LED beads 10. This design minimizes the outward refraction of the emitted light from the LED beads 10 through the optical structure unit 410, thereby improving the display effect of the display module to a certain extent.

[0041] Furthermore, in other preferred embodiments of this utility model, the surface of the micro-protrusion 4101 is formed by connecting multiple arc-shaped structures with different radii of curvature R end to end.

[0042] Specifically, the micro-protrusions 4101 are not formed by semicircles or arches with the same radius of curvature, but by multiple arc-shaped structures with different radii of curvature R connected together in a first-to-last connection. This design can make the display surface of the display module more uneven, further avoiding specular reflection.

[0043] Furthermore, in other preferred embodiments of this invention, the radius of curvature R is 30-180 μm.

[0044] In other preferred embodiments of the present invention, the optical properties of the material of the optical structure unit 410 are that the haze value is greater than 90%.

[0045] Specifically, the optical structure unit 410 is made of optical material with a haze value greater than 90%, which ensures that it will not produce specular reflection under ambient light, thereby further improving the display effect of the display module.

[0046] Furthermore, in other preferred embodiments of this utility model, a blackened surface layer 50 is provided on the side of the potting compound layer 20 facing away from the PCB board 30.

[0047] Specifically, the surface blackening layer 50 is disposed on the surface of the potting compound layer 20. The blackening layer 50 can enhance the blackness of the display surface of the display module, thereby significantly improving its contrast and further enhancing the display effect of the display module.

[0048] The following is a brief introduction to the manufacturing process of the display module:

[0049] 1. Clean the LED light board (including the PCB board 30 and LED beads 10);

[0050] 2. Prepare the required potting compound material (generally AB glue / UV glue, or blackening treatment can be added to the glue to improve the PCB ink color difference and make the light board after GOB encapsulation appear darker);

[0051] 3. Apply the prepared potting compound to the lamp board for filling, then perform vacuum degassing, followed by membrane pressing and curing to obtain the potting compound layer 20. Note: The surface texture after GOB is mainly determined by selecting the surface roughness of the release film;

[0052] 4. After curing, the excess adhesive edge of the GOB module is removed to obtain the GOB packaged light board;

[0053] 5. Using specialized equipment, optical polymers are constructed on the surface of the GOB encapsulated lamp board to form the optical structure layer 40 with discontinuous micro-protrusions. Here, the microstructure formation method can be physical imprinting / chemical etching / optical shaping, etc.

[0054] The parameters of the optical structure unit 410 are as follows:

[0055] Its height H: 50-200μm (preferably 100μm)

[0056] Its base width W: 100-600μm (equidistant distribution)

[0057] Its radius of curvature R: 30-180μm (multiple curvature composite)

[0058] Its spatial arrangement: the unit density varies with the lamp spacing, with the lamp spacing as the center spacing of the structure;

[0059] Its material optical properties: haze value > 90%;

[0060] 6. Clean the surface of the lamp board, and then apply a color coating to the surface of the lamp board to form the surface blackening layer 50, thereby increasing the surface blackness through color coating.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, and not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A display module, characterized in that, include: PCB board; Multiple LED beads are arranged in an array on the PCB board; A potting compound layer is provided on the side of the PCB board where the LED beads are located, and the LED beads are encapsulated therein; An optical structure layer is disposed on the side of the potting compound layer facing away from the PCB board, and includes multiple optical structure units, with one optical structure unit located between two adjacent rows of LED beads.

2. The display module according to claim 1, characterized in that, An optical structure unit is also provided in addition to the two rows of LED beads located at the two side edges.

3. The display module according to claim 1, characterized in that, The end face of the optical structure unit is a micro-protrusion on the surface of the potting adhesive layer.

4. The display module according to claim 3, characterized in that, The height H of the micro-protrusion is 50-200 μm.

5. The display module according to claim 3, characterized in that, The width W of the micro-protrusion is 100-600 μm.

6. The display module according to claim 3, characterized in that, The surface of the micro-protrusion is formed by connecting multiple arc-shaped structures with different radii of curvature R end to end.

7. The display module according to claim 6, characterized in that, The radius of curvature R is 30-180 μm.

8. The display module according to any one of claims 1-7, characterized in that, The optical properties of the material of the optical structural unit are that the haze value is greater than 90%.

9. The display module according to any one of claims 1-7, characterized in that, The optical structure unit is located at the geometric center of two adjacent rows of LED beads.

10. The display module according to any one of claims 1-7, characterized in that, A blackened surface layer is also provided on the side of the potting compound layer facing away from the PCB board; The optical structure unit is located on the side of the surface with the blackened layer facing away from the potting compound layer.

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