Display module

Abstract

The utility model discloses a display module relates to display module technical field, include: circuit board, set up in the circuit board a plurality of LED and the function film that covers a plurality of LED, the function film includes base layer, sets up in the base layer bottom surface adhesive layer and sets up in the base layer top surface black film layer, and the base layer is with black film layer sets up in the above of a plurality of LED, the adhesive layer of function film is pasted on a plurality of LED, and a plurality of LED are contained in the inside of adhesive layer, or the function film and a plurality of LED between setting up have the encapsulation layer, and a plurality of LED are contained in the encapsulation layer, and the hardness of function film is greater than the hardness of encapsulation layer. Through setting up function film on the surface of display module, improves the anti -collision performance of display module based on function film, and reduces the risk that display module appears warping deformation, improves the light -emitting display effect of display module through the black film layer of function film.

Description

Technical Field

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

[0002] Existing display modules are formed by multiple LED patches arranged with small pitch and are widely used in exhibitions, business and education, security monitoring, smart cities and other fields. Since the working scenarios of display modules involve different environments such as indoor and outdoor, and the temperature range of the working environment is large, the encapsulation colloid used in existing display modules is used to pot and protect the LEDs. Currently, the encapsulation colloid generally has the following problems: if the hardness of the colloid material is too small, it will result in weak impact resistance of the display module; or if the hardness of the colloid material is too large, it will cause the encapsulation colloid of the display module to warp and deform in low temperature environment, which will affect the light output display effect of the display module. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art. This utility model provides a display module. By setting a functional film on the surface of the display module, the anti-collision performance of the display module is improved and the risk of warping and deformation of the display module is reduced. The black film layer of the functional film improves the light emission display effect of the display module.

[0004] This utility model provides a display module, which includes: a circuit board, a plurality of LEDs disposed on the circuit board, and a functional film covering the plurality of LEDs; The functional film includes a base layer, an adhesive layer disposed on the bottom surface of the base layer, and a black film layer disposed on the top surface of the base layer. The base layer and the black film layer are disposed above a plurality of LEDs, and the light emitted by the LEDs passes through the base layer and the black film layer in sequence. The adhesive layer of the functional film is attached to a plurality of LEDs, and the plurality of LEDs are housed inside the adhesive layer, or an encapsulation layer is provided between the functional film and the plurality of LEDs, and the plurality of LEDs are housed inside the encapsulation layer. The hardness of the functional film is greater than that of the encapsulation layer.

[0005] Furthermore, the encapsulation layer is made of one of epoxy resin adhesives, polyurethane resin adhesives, or acrylic resin adhesives.

[0006] Furthermore, the hardness of the encapsulation layer is 'a', and the value range of 'a' is: 30HD≤a≤50HD.

[0007] Furthermore, an optical layer is provided on the top surface of the encapsulation layer, which is formed based on the film texture imprint of the release film.

[0008] Furthermore, when several LEDs are housed in the encapsulation layer, the thickness of the adhesive layer is h3, and the value of h3 is in the range of 20μm≤h3≤100μm.

[0009] Furthermore, the thickness of the adhesive layer is h3, and the value of h3 is in the range of 100μm≤h3≤250μm.

[0010] Furthermore, the thickness of the base layer is h1, and the value of h1 is: 90μm≤h1≤200μm.

[0011] Furthermore, the base layer is made of PET material.

[0012] Furthermore, the thickness of the black film layer is h2, and the value of h2 is in the range of 2μm≤h2≤30μm.

[0013] Furthermore, the gloss of the light-emitting side surface of the functional film is b, and the value range of b is: 4GU≤b≤13GU.

[0014] Furthermore, the transmittance of the functional membrane is γ, and the value of γ ranges from 50% to 95%.

[0015] Furthermore, the hardness of the functional membrane is c, and the range of the hardness c of the functional membrane is: 60HD≤c≤105HD.

[0016] This utility model provides a display module. By setting a functional film with high hardness inside the display module, the functional film can improve the impact resistance of the display module. By reducing the light emission brightness of the light-emitting surface of the display module through the black film layer of the functional film, the contrast of the light emission display pattern of the display module is improved, thereby improving the display effect of the light emission pattern of the display module. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the display module structure according to Embodiment 1 of this utility model; Figure 2 This is an appendix to the embodiments of this utility model. Figure 1 Enlarged schematic diagram of the structure at point A; Figure 3 This is a schematic diagram of the functional membrane structure of an embodiment of the present invention; Figure 4 This is a schematic diagram of the display module structure according to Embodiment 2 of this utility model. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1: Figure 1 A schematic diagram of the display module according to an embodiment of the present invention is shown. Figure 2 The appendix illustrating an embodiment of the present utility model is shown. Figure 1 Enlarged schematic diagram of the structure at point A; Figure 3 A schematic diagram of the functional film structure of an embodiment of the present invention is shown. The display module includes: a circuit board 1, a plurality of LEDs 2 disposed on the circuit board 1, and a functional film 5 covering the plurality of LEDs 2. The functional film 5 includes a base layer 52, an adhesive layer 51 disposed on the bottom surface of the base layer 52, and a black film layer 53 disposed on the top surface of the base layer 52. The base layer 52 and the black film layer 53 are disposed above the plurality of LEDs 2, and the light emitted by the LEDs 2 passes through the base layer 52 and the black film layer 53 in sequence.

[0020] The circuit board 1 can be one of the following substrate structures: BT board (Bismaleimide Triazine, resin-based copper clad laminate), EMC board (Epoxy Molding Compound), SMC board (Sheet Molding Compound), FR4 board (Flame Retardant 4), PPA board (Polyphthalamide), PCT board (Poly1,4-cyclohexylene dimethylene terephthalate), etc., to meet the surface mount requirements of several LEDs 2.

[0021] Furthermore, the top surface of the circuit board 1 is covered with an ink layer 3, which is disposed between several LEDs 2, so that the ink layer 3 can cover the metal layer on the top surface of the circuit board 1, thereby improving the appearance consistency of the display module and effectively improving the light output display effect of the display module.

[0022] The display module also includes an encapsulation layer 4, which is disposed between the functional film 5 and the plurality of LEDs 2, and the plurality of LEDs 2 are housed inside the encapsulation layer 4. The encapsulation layer 4 can provide potting protection for the plurality of LEDs 2, preventing external moisture from intruding into the electrical connection positions of the plurality of LEDs 2, thereby improving the working reliability of the plurality of LEDs 2.

[0023] Furthermore, the encapsulation layer 4 can be made of one of epoxy resin adhesives, polyurethane resin adhesives, or acrylic resin adhesives, possessing good encapsulation and electrical insulation properties, and capable of meeting the potting requirements for several LEDs 2.

[0024] Specifically, the hardness of the encapsulation layer 4 is 'a', and the value of 'a' is in the range of 30HD≤a≤50HD, which can meet the potting and encapsulation requirements of several LEDs 2. By using a low-hardness encapsulation colloid material to complete the potting and encapsulation of several LEDs 2, the risk of warping and deformation of the encapsulation layer 4 can be reduced when the LED module is in an environment with a temperature below zero degrees Celsius.

[0025] Furthermore, the distance between the top surface of the encapsulation layer 4 and the top surface of the chips of the LEDs 2 is d1, and the value of d1 is in the range of 50μm≤d1≤250μm. It can be adjusted according to the actual encapsulation requirements of the display module to meet the potting requirements of the LEDs 2.

[0026] Specifically, an optical layer 41 is provided on the top surface of the encapsulation layer 4. The optical layer 41 is formed by imprinting the release film texture. By imprinting an uneven texture structure on the top surface of the encapsulation layer 4, the light emitted by several LEDs 2 can be refracted and diffused through the uneven texture structure of the encapsulation layer 4, which can improve the light emission uniformity of the display module, thereby reducing the light intensity of the light emission surface, improving the contrast of the light emission effect of the display module, and achieving the effect of visual blackening.

[0027] Specifically, the thickness of the base layer 52 is h1, and the value of h1 is 90μm≤h1≤200μm. The thickness h1 of the base layer 52 can be one of 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, and 200μm, so that the base layer 52 has a certain thickness to meet the protection requirements of the display module. The material of the base layer 52 is polyethylene terephthalate (PET), which has good mechanical properties and folding resistance. The base layer 52 is used to bear the anti-collision function of the display module, so that the display module has good impact resistance.

[0028] Furthermore, the base layer 52 can support the adhesive layer 51 and the black film layer 53. The adhesive layer 51 is used to achieve the bonding connection between the functional film 5 and the encapsulation layer 4, and the black film layer 53 is used to improve the light emission efficiency of the display module.

[0029] Specifically, the thickness of the black film layer 53 is h2, and the value range of h2 is: 2μm≤h2≤30μm. The thickness h2 of the black film layer 53 can be one of 2μm, 4μm, 6μm, 8μm, 10μm, 12μm, 14μm, 16μm, 18μm, 20μm, 22μm, 24μm, 26μm, 28μm, and 30μm, so that the thickness of the black film layer 53 can adjust the light emission efficiency of the display module.

[0030] Furthermore, the material of the black film layer 53 can be UV adhesive (Ultraviolet adhesive), and the UV adhesive is doped with carbon black powder. By adjusting the addition ratio of carbon black powder in the black film layer 53, the light transmittance of the black film layer 53 can be adjusted, thereby improving the light emission efficiency of the display module. By setting the black film layer 53, the light emission contrast of the display module is increased, thereby improving the pattern display effect of the display module.

[0031] Specifically, the thickness of the adhesive layer 51 is h3, and the value of h3 is in the range of 20μm≤h3≤100μm. The thickness h3 of the adhesive layer 51 can be one of 20μm, 40μm, 60μm, and 80μm, so that the adhesive layer 51 has sufficient adhesiveness to achieve the bonding and fixation between the functional film 5 and the encapsulation layer 4.

[0032] Furthermore, in this embodiment, the thickness h3 of the adhesive layer 51 is preferably between 20μm and 100μm, which can meet the overall packaging size requirements of the display module and the bonding requirements of the adhesive layer 51.

[0033] Furthermore, the adhesive layer 51 can be made of OCA optical adhesive, which is made of optical grade acrylic adhesive. OCA optical adhesive (Optically Clear Adhesive) is an optically transparent adhesive with a light transmittance of over 99% and high adhesive strength. It can meet the bonding requirements between the functional film 5 and the encapsulation layer 4, and also meet the light output requirements of the LED2 of the display module.

[0034] Specifically, the surface gloss of the light-emitting side of the functional film 5 is b, and the value of b ranges from 4GU to 13GU, giving the functional film 5 a certain matte effect, which can meet the usage requirements of the display module. The light transmittance of the functional film 5 is γ, and the value of γ ranges from 50% to 95%, giving the functional film 5 good light transmittance, improving the brightness of the pattern display of the display module, and improving the contrast of the display pattern of the display module based on the black film layer 53 of the functional film 5.

[0035] Specifically, the hardness of the functional film 5 is c, and the range of the hardness value is: 60HD≤c≤105HD. The hardness of the functional film 5 is greater than the hardness of the encapsulation layer 4. By attaching the functional film 5 to the surface of the encapsulation layer 4, the overall hardness of the display module can be improved, thereby improving the anti-collision and impact resistance of the display module.

[0036] Furthermore, the manufacturing process of the display module is as follows: a release film with a textured surface is placed in a carrier with the textured side facing upwards. Encapsulating adhesive is poured into the textured surface of the release film, and a circuit board 1 with several LEDs 2 is covered in the encapsulating adhesive using a GOB (Glued On Board) process, so that the encapsulating adhesive completely encapsulates the LEDs 2. After the encapsulating adhesive dries and sets, the carrier is removed, and the release film is peeled off, allowing the texture of the release film to be imprinted on the top surface of the encapsulation layer 4 formed by the encapsulating adhesive, thereby forming the optical layer 41 on the top surface of the encapsulation layer 4, achieving the light emission visual blackening effect of the display module. The functional film 5 is attached to the surface of the optical layer 41 of the encapsulation layer 4, and the boundary residual adhesive of the encapsulation module is removed using a precision engraving machine, thereby obtaining the display module.

[0037] The display module provided in this embodiment of the utility model improves the impact resistance and anti-collision performance of the display module by setting a high-hardness functional film 5 on the encapsulating adhesive of the display module. By setting a black film layer 53 in the functional film 5 to blacken the surface of the display module, the contrast of the pattern display of the display module can be improved, thereby improving the light emission display effect of the display module.

[0038] Example 2: Figure 4The diagram shows a schematic of the display module in an embodiment of the present invention. In this embodiment, the functional film 5 is attached to a plurality of LEDs 2 based on an adhesive layer 51, and the plurality of LEDs 2 are contained within the adhesive layer 51. The display module is made of LED beads. Since the thickness of the LED beads is less than 150μm, the adhesive layer 51 of the functional film 5 can be used to encapsulate the plurality of LEDs 2, which can reduce the encapsulation operation of the LEDs 2 and thus improve the manufacturing efficiency of the display module.

[0039] The circuit board 1 can be one of the substrate structures such as BT board, EMC board, SMC board, FR4 board, PPA board, PCT board, etc., to meet the surface mount requirements of several LEDs 2. An ink layer 3 is provided between several LEDs 2. The ink layer 3 is used to cover the top metal of the circuit board 1 to improve the appearance consistency of the display module, thereby improving the light output efficiency of the display module.

[0040] Specifically, the adhesive layer 51 can be made of epoxy resin adhesive, and a curing agent is added to the adhesive layer 51 so that the adhesive layer 51 can be cured and shaped under high temperature conditions, thereby enabling the adhesive layer 51 of the functional film 5 to meet the encapsulation requirements of several LEDs 2.

[0041] Specifically, the thickness of the adhesive layer 51 is h3, and the value of h3 is in the range of 100μm≤h3≤250μm. The thickness h3 of the adhesive layer 51 can be one of 100μm, 120μm, 140μm, 160μm, 180μm, 200μm, 220μm, 240μm, and 250μm, so that several LEDs 2 can be completely accommodated in the adhesive layer 51. The adhesive layer 51 has sufficient adhesiveness to meet the bonding and fixing of the functional film 5 to the circuit board 1. The adhesive layer 51 can meet the plastic encapsulation requirements of several LEDs 2 on the circuit board 1, and at the same time meet the overall packaging size requirements of the display module.

[0042] Specifically, the thickness of the black film layer 53 is h2, and the value of h2 is in the range of 2μm≤h2≤30μm, so that the thickness of the black film layer 53 can adjust the light emission efficiency of the display module. The material of the black film layer 53 can be UV adhesive (Ultraviolet adhesive), and the UV adhesive contains carbon black powder. By adjusting the proportion of carbon black powder added to the black film layer 53, the light transmittance of the black film layer 53 can be adjusted, thereby improving the light emission efficiency of the display module. By setting the black film layer 53 to increase the surface blackness of the display module, the light emission contrast of the display module is increased, thereby improving the pattern display effect of the display module.

[0043] Specifically, the surface gloss of the light-emitting side of the functional film 5 is b, and the value of b ranges from 4GU to 13GU, giving the functional film 5 a certain matte effect, which can meet the usage requirements of the display module. The light transmittance of the functional film 5 is γ, and the value of γ ranges from 50% to 95%, giving the functional film 5 good light transmittance, improving the brightness of the pattern display of the display module, and improving the contrast of the display pattern of the display module based on the black film layer 53 of the functional film 5.

[0044] Specifically, the hardness of the functional film 5 is c, and the range of the hardness value is: 60HD≤c≤105HD. By attaching the functional film 5 to the surface of the LED2, the overall hardness of the display module can be improved, thereby improving the anti-collision and impact resistance of the display module.

[0045] Furthermore, the manufacturing process of the display module is as follows: a circuit board 1 with several LEDs 2 is laid flat with the side containing several LEDs 2 facing upwards. The functional film 5 is covered on several LEDs 2 of the circuit board 1. The functional film 5 is pressed onto several LEDs 2 of the circuit board 1 by a roller bonding process under heated and pressurized working conditions, so that several LEDs 2 are completely contained in the adhesive layer 51.

[0046] The adhesive layer 51 of the functional film 5 is cured at an ambient temperature between 80℃ and 130℃ for 60 min to 120 min to achieve complete curing. This encapsulates and protects several LEDs 2, thus achieving waterproof protection for the LEDs and preventing moisture from entering the LEDs and affecting the electrical connection stability of the LEDs.

[0047] This embodiment of the invention provides a display module. By setting a high-hardness functional film 5, the impact resistance of the display module is improved. An adhesive layer 51 formed by epoxy resin is also provided, allowing the adhesive layer 51 to fill between several LEDs 2, achieving plastic encapsulation of the LEDs 2. This reduces the pre-encapsulation operation of the LEDs on the circuit board 1, thereby improving the manufacturing efficiency of the display module. By setting a black film layer 53 within the functional film 5, the surface blackness of the display module can be improved, thereby increasing the pattern display contrast and effectively enhancing the image display effect of the display module.

[0048] Furthermore, the above description provides a detailed overview of a display module provided by the embodiments of this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A display module, characterized in that, The display module includes: a circuit board, a plurality of LEDs disposed on the circuit board, and a functional film covering the plurality of LEDs; The functional film includes a base layer, an adhesive layer disposed on the bottom surface of the base layer, and a black film layer disposed on the top surface of the base layer. The base layer and the black film layer are disposed above a plurality of LEDs, and the light emitted by the LEDs passes through the base layer and the black film layer in sequence. The adhesive layer of the functional film is attached to a plurality of LEDs, and the plurality of LEDs are housed inside the adhesive layer, or an encapsulation layer is provided between the functional film and the plurality of LEDs, and the plurality of LEDs are housed inside the encapsulation layer. The hardness of the functional film is greater than that of the encapsulation layer.

2. The display module as described in claim 1, characterized in that, The encapsulation layer is made of one of the following materials: epoxy resin adhesive, polyurethane resin adhesive, or acrylic resin adhesive.

3. The display module as described in claim 1, characterized in that, The hardness of the encapsulation layer is 'a', and the value of 'a' ranges from 30HD to 50HD.

4. The display module as described in claim 1, characterized in that, An optical layer is provided on the top surface of the encapsulation layer, and the optical layer is formed based on the film texture imprint of the release film.

5. The display module as described in claim 1, characterized in that, When several LEDs are housed in the encapsulation layer, the thickness of the adhesive layer is h3, and the value of h3 is in the range of 20μm≤h3≤100μm.

6. The display module as described in claim 1, characterized in that, The thickness of the adhesive layer is h3, and the value of h3 is in the range of 100μm≤h3≤250μm.

7. The display module as described in claim 1, characterized in that, The thickness of the base layer is h1, and the value of h1 is: 90μm≤h1≤200μm.

8. The display module as described in claim 1, characterized in that, The base layer is made of PET material.

9. The display module as described in claim 1, characterized in that, The thickness of the black film layer is h2, and the value of h2 is in the range of 2μm≤h2≤30μm.

10. The display module as described in claim 1, characterized in that, The gloss of the light-emitting side surface of the functional film is b, and the value of b is in the range of 4GU≤b≤13GU.

11. The display module as described in claim 1, characterized in that, The transmittance of the functional membrane is γ, and the value of γ is in the range of 50%≤γ≤95%.

12. The display module as described in claim 1, characterized in that, The hardness of the functional membrane is c, and the range of the hardness c is: 60HD≤c≤105HD.

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