Back adhesive structure of display module, display module, display panel and display device

Abstract

The utility model provides a back adhesive structure of display module, display module, display panel, display device, back adhesive structure includes open pore area and non-porous area, open pore area is clearance area, non-porous area includes at least two layer structure, different layers adopt different materials, the adopted material includes gray foam, PET or silica gel material, and the back adhesive structure includes the open pore area and the non-porous area. The back adhesive structure of the display module can improve the display effect, effectively balances the reflectivity difference between the hole area and the non-hole area, enables the brightness of a display screen to be more uniform and consistent, and enables the color to be more consistent and accurate. The Mura problem is reduced, the fingerprint hole Mura problem in under-screen fingerprint identification is effectively reduced, and the overall quality and reliability of the display module are improved. And by adopting the design of the back adhesive structure of the display module provided by the utility model, a displayed picture is clearer and more natural, a user can have better visual experience when using the display module, and the competitiveness and market attraction of the product are enhanced.

Description

Technical Field

[0001] The utility model relates to the field of display panel structures, in particular to a back glue structure of a display module, a display module, a display panel and a display device. Background Art

[0002] With the development of display technology, under-screen fingerprint recognition technology has gradually become popular. Under-screen fingerprint recognition technology is mainly divided into two types: optical and ultrasonic. Regardless of which technology is used, under-screen fingerprint recognition requires a clear area to be reserved on the adhesive layer of the display module to ensure the effective operation of the fingerprint sensor. These clear areas are usually open areas, which are different from the surrounding non-hole areas in the adhesive structure and material.

[0003] Mura is a common defect in display modules, which usually manifests as uneven brightness or inconsistent colors on the display. There are many reasons for the occurrence of Mura, including uneven materials and manufacturing process defects. In the under-screen fingerprint recognition technology, the backing layer needs to reserve a clearance area, such as Figure 1 The display module shown includes a back glue layer and various functional layers thereon, and typical functional layers include support film SF (Support Film), protective layer PI1 (Polyimide Layer) polyimide layer 1, optoelectronic material layer SiOx / a-Si (Silicon Oxide / Amorphous Silicon) silicon oxide / amorphous silicon layer, protective layer PI2 (Polyimide Layer) polyimide layer 2, buffer layer Buffer, passivation layer PS (Passivation Layer), gate insulating layer GI (Gate Insulator), and the gate Gate of the pixel, the different transmission paths of light in the fingerprint hole area and the non-hole area, where the solid line represents the incident light and the dotted line represents the reflected light, the reflectivity of the fingerprint hole area and the non-hole area of ​​the back glue layer is significantly different, and this difference will gradually increase during long-term use, and eventually lead to the Mura problem, which is specifically manifested as fingerprint hole Mura. Usually, the back glue of the display module is mostly black material, because black material has good light absorption and can reduce light reflection. However, in the under-screen fingerprint recognition technology, this design will cause a series of problems due to the large difference in reflectivity between the hole area and the non-hole area. Specifically, due to the strong light absorption of the black adhesive material, the reflectivity difference between the hole area (clearance area) and the non-hole area is significant. In addition, the threshold voltage (Vth) offset generated by the substrate circuit under different light excitation intensities is different, resulting in a large difference in long-term reflectivity between the hole area and the non-hole area, which easily causes the fingerprint hole Mura problem.

[0004] The fingerprint hole Mura problem is that after long-term use of the display screen, there is a significant difference in brightness between the fingerprint recognition area (i.e. the opening area) and the surrounding non-fingerprint recognition area (i.e. the non-hole area), which affects the display effect and reduces the user experience.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the utility model, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0006] In view of this, the utility model provides a back glue structure of a display module, a display module, a display panel, and a display device, which can effectively solve the fingerprint hole Mura problem caused by the back glue layer of the display module in the prior art, thereby improving the overall quality and display effect of the display screen.

[0007] One aspect of the utility model provides a back glue structure of a display module, the back glue structure includes an open hole area and a non-hole area, the open hole area is a clearance area, the non-hole area includes at least two layers of structure, different layers use different materials, the used materials include black foam, gray foam, PET or silicone gel material, for reducing the reflectivity difference between the fingerprint hole area and the non-hole area.

[0008] Further, the non-porous area has a gradient color, transitioning from black to gray or light color.

[0009] Furthermore, a layer of white or gray grid-textured glue is provided in the non-hole area close to the display module.

[0010] Furthermore, the non-porous area includes a two-layer structure, and the bottom layer material in the non-porous area away from the display module is made of one of black foam, PET or silicone gel.

[0011] Furthermore, the surface of the non-hole area has a micro-nano structure for changing the reflection path and scattering characteristics of light.

[0012] Furthermore, titanium oxide or zinc oxide particles are added to the material of the non-porous area to adjust the reflectivity.

[0013] Another aspect of the present invention further provides a display module, comprising a back adhesive layer, wherein the back adhesive layer comprises the back adhesive structure of the display module described above.

[0014] Another aspect of the present invention further provides a display panel, comprising a back adhesive layer, wherein the back adhesive layer comprises the back adhesive structure of the display module.

[0015] Another aspect of the present invention further provides a display device, which includes the above-mentioned display panel.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] Compared with the prior art, the beneficial technical effects brought by the display panel of the present utility model can be summarized as follows:

[0018] To improve the display effect, the adhesive structure design of the display module provided by the utility model effectively balances the reflectivity difference between the hole area and the non-hole area, making the brightness of the display screen more uniform and the color more consistent and accurate.

[0019] Reducing the Mura problem: The adhesive structure design of the display module provided by the utility model effectively reduces the occurrence of the Mura problem of the fingerprint hole in the under-screen fingerprint recognition, and improves the overall quality and reliability of the display module.

[0020] Improve user experience: The adhesive structure design of the display module provided by the utility model makes the display image clearer and more natural, and users will have a better visual experience when using it, thereby enhancing the competitiveness and market appeal of the product.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present utility model, and together with the specification, are used to explain the principles of the present utility model. Obviously, the drawings described below are only some embodiments of the present utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram showing the structure of a display panel in the prior art is shown;

[0024] Figure 2 A schematic diagram showing the adhesive structure of a display module provided in a specific embodiment of the utility model is shown;

[0025] Figure 3 A schematic diagram showing the adhesive structure of a display module provided in a specific embodiment of the utility model is shown;

[0026] Figure 4 A schematic diagram of the adhesive structure of a display module provided in a specific embodiment of the utility model is shown.

[0027] Reference numerals:

[0028] 100 Black Foam 110 Grey Grid

[0029] 210 gradient foam 300 gray silicone gel

[0030] 900Panel layer DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Instead, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0032] The words "first", "second" and similar words used in the specific description do not indicate any order, quantity or importance, but are only used to distinguish different components. In addition, in the description of the present invention, the directions or positional relationships indicated by the terms "upper" and "lower" are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as a limitation of the present invention.

[0033] The present application provides a back glue structure of a display module, the back glue structure includes an open hole area and a non-hole area, the open hole area is a clearance area, and the material used in the non-hole area includes one or more gray foam, PET or silicone gel materials, which are used to reduce the reflectivity difference between the fingerprint hole area and the non-hole area. By adjusting the back glue color to reduce the reflectivity difference between the fingerprint hole and the non-hole area, the fingerprint hole Mura is avoided. In the display module, the back glue layer usually uses black material to absorb light. However, when the fingerprint recognition technology is integrated into the display module, it is necessary to open a fingerprint hole area in the back glue layer so that the area is not covered by the back glue. Since the open hole area is not covered with back glue, and the surrounding non-hole area is black, this will cause a significant difference in the reflected light between the hole area and the non-hole area. The black back glue in the non-hole area absorbs light, resulting in a lower reflectivity, while the open hole area has a higher reflectivity because it is not covered with back glue. This long-standing reflectivity difference will cause the display module to have a brightness difference between the hole area and the non-hole area, thereby causing the Mura phenomenon, that is, the problem of uneven brightness. By using materials such as gray foam, PET or silicone gel, the reflectivity of the non-hole area can be adjusted to be closer to the hole area, thereby balancing the reflectivity difference between the hole area and the non-hole area. Adhesives of different colors and materials have different scattering and absorption characteristics for light. Using existing gray adhesive materials such as foam, PET or silicone gel can absorb light to a certain extent, and can also scatter light appropriately, so that the overall reflectivity is between black and completely uncovered areas. By selecting the right grayscale and material, the reflection path of light can be optimized, making the optical properties of the non-hole area and the hole area more consistent, and reducing the brightness difference caused by different reflectivities.

[0034] Example 1

[0035] like Figure 2 The figure shows a back glue structure of a display module provided in this embodiment. The back glue structure includes an opening area and a non-hole area. The opening area is a clear area. The material used in the non-hole area includes one or more black foam, gray foam, PET or silicone gel material, which is used to reduce the reflectivity difference between the fingerprint hole area and the non-hole area.

[0036] Optionally, the non-porous area includes at least two layers, and different layers are made of different materials. Figure 2 As shown, the back glue structure in the non-porous area near the Panel layer 900 uses a material with a gray grid pattern 110 glue, but the utility model is not limited to this. The gray grid pattern 110 can also be a white grid pattern or other patterns that can achieve the same technical effect as the technical solution of the utility model. They all fall within the protection scope of the utility model.

[0037] Optionally, the non-porous area has a gradient color, transitioning from black to gray or light color. Figure 2As shown, different layers in the multi-layer adhesive structure in the non-porous area use different materials. From the lower right to the top of the figure, the color of each layer of adhesive material transitions from black to gray or light color. The bottom layer of black material uses black foam 100, but the utility model is not limited to this. The black foam 100 can also be other black materials. Other patterns that can achieve the same technical effect of the technical solution of the utility model belong to the protection scope of the utility model, and the specific settings of the above layers will not be repeated.

[0038] Optionally, the surface of the non-hole area has a micro-nano structure for changing the reflection path and scattering characteristics of light. Micro-nano structures can be set on the surface of the non-hole area to further improve the optical performance. These micro-nano structures can be tiny protrusions, depressions or specific patterns, such as micron- or nano-scale grids, dots or ripples. These structures can effectively reduce the concentrated reflection of reflected light and avoid uneven brightness caused by reflectivity differences by changing the reflection path and scattering characteristics of light. By setting micro-nano structures on the surface of the non-hole area, the reflection path and scattering characteristics of light can be changed. These micro-nano structures can scatter the incident light into multiple directions, reduce the strong reflected light in a single direction, and thus make the distribution of reflected light in different directions more uniform. In this way, the reflectivity difference between the fingerprint hole area and the non-hole area can be effectively reduced, and uneven brightness can be avoided, thereby reducing the generation of fingerprint hole Mura phenomenon.

[0039] Optionally, titanium oxide or zinc oxide particles are added to the material of the non-hole area to adjust the reflectivity. Due to their high refractive index and excellent optical properties, these particles can effectively adjust the reflective properties of the material so that the reflectivity of the hole area and the non-hole area is closer. By adding titanium oxide or zinc oxide particles to the non-hole area material, the high refractive index characteristics of these particles can be used to adjust the optical reflective properties of the material. Titanium oxide and zinc oxide particles can effectively scatter and reflect incident light, thereby reducing strong reflected light in a single direction and making the reflected light more evenly distributed. This adjustment can make the reflectivity of the hole area and the non-hole area closer, thereby avoiding the uneven brightness caused by the difference in reflectivity and reducing the occurrence of fingerprint hole Mura.

[0040] In summary, the adhesive structure of the display module provided in this embodiment adopts materials such as gray foam, PET or silicone gel, and performs a multi-layer design of the adhesive structure in the material of the non-hole area, which not only effectively reduces the reflectivity difference between the fingerprint hole area and the non-hole area, avoids the occurrence of the fingerprint hole Mura phenomenon, but also improves the optical performance and overall display effect of the display module. In addition, the addition of titanium oxide or zinc oxide particles and micro-nano structures further optimizes the reflection path and scattering characteristics of light, improves the uniformity and stability of the display, and thus achieves a higher quality display effect.

[0041] Example 2

[0042] like Figure 3 The figure shows a back glue structure of a display module provided in this embodiment. The back glue structure includes an opening area and a non-hole area. The opening area is a clear area. The material used in the non-hole area includes one or more black foam, gray foam, PET or silicone gel material, which is used to reduce the reflectivity difference between the fingerprint hole area and the non-hole area.

[0043] Optionally, the non-porous area includes a two-layer structure, and the bottom layer material away from the display module is made of black foam, PET or silicone gel. In order to improve the display effect, the non-porous area has a gradient color, transitioning from black to gray or light color. Figure 3 The non-porous area shown includes a gradient color foam 210 and a black foam 220, wherein the gradient color foam 210 is Figure 3 The color change shown transitions from black to gray or light color in the left-right direction.

[0044] Optionally, the surface of the non-hole area has a micro-nano structure for changing the reflection path and scattering characteristics of light. Micro-nano structures can be set on the surface of the non-hole area to further improve the optical performance. These micro-nano structures can be tiny protrusions, depressions or specific patterns, such as micron- or nano-scale grids, dots or ripples. These structures can effectively reduce the concentrated reflection of reflected light and avoid uneven brightness caused by reflectivity differences by changing the reflection path and scattering characteristics of light. By setting micro-nano structures on the surface of the non-hole area, the reflection path and scattering characteristics of light can be changed. These micro-nano structures can scatter the incident light into multiple directions, reduce the strong reflected light in a single direction, and thus make the distribution of reflected light in different directions more uniform. In this way, the reflectivity difference between the fingerprint hole area and the non-hole area can be effectively reduced, and uneven brightness can be avoided, thereby reducing the generation of fingerprint hole Mura phenomenon.

[0045] Optionally, titanium oxide or zinc oxide particles are added to the material of the non-hole area to adjust the reflectivity. Due to their high refractive index and excellent optical properties, these particles can effectively adjust the reflective properties of the material so that the reflectivity of the hole area and the non-hole area is closer. By adding titanium oxide or zinc oxide particles to the non-hole area material, the high refractive index characteristics of these particles can be used to adjust the optical reflective properties of the material. Titanium oxide and zinc oxide particles can effectively scatter and reflect incident light, thereby reducing strong reflected light in a single direction and making the reflected light more evenly distributed. This adjustment can make the reflectivity of the hole area and the non-hole area closer, thereby avoiding the uneven brightness caused by the difference in reflectivity and reducing the occurrence of fingerprint hole Mura.

[0046] In summary, the adhesive structure of the display module provided in this embodiment can effectively reduce the reflectivity of the non-hole area and make it closer to the reflectivity of the open hole area by using gray foam, PET or silicone gel material, gradient color design, micro-nano structure and adding titanium oxide or zinc oxide particles, thereby reducing the reflectivity difference between the open hole area and the non-hole area. This will effectively reduce the occurrence of fingerprint hole Mura, improve the display quality of the display module, and enhance the user experience.

[0047] Example 3

[0048] like Figure 4 The figure shows a back glue structure of a display module provided in this embodiment. The back glue structure includes an opening area and a non-hole area. The opening area is a clear area. The material used in the non-hole area includes one or more black foam, gray foam, PET or silicone gel material, which is used to reduce the reflectivity difference between the fingerprint hole area and the non-hole area.

[0049] The non-hole area is set to the same material, such as Figure 4 Gray silicone gel 300 is shown, but the present invention is not limited thereto. Other gray foam or gray PET materials and other color materials that can achieve the same technical effect as the technical solution of the present utility model all fall within the protection scope of the present utility model.

[0050] Optionally, the non-porous area has a gradient color, transitioning from black to gray or light color. The gray silicone gel 300 in the non-porous area forms a gradient from black to gray from bottom to top. This design can cause light to be diffusely reflected in the non-porous area, further weakening the reflection intensity of the light, thereby reducing the reflectivity difference between the open-porous area and the non-porous area, and reducing the probability of fingerprint hole Mura.

[0051] Optionally, a layer near the display module is provided with a white or gray grid-textured glue. A layer of white or gray grid-textured glue can be printed or coated on the surface of the gray silicone gel 300. The grid size and shape of the grid-textured glue can be adjusted according to actual needs. The grid-textured glue can further scatter light and reduce the reflection intensity of light, thereby improving the display effect and reducing the occurrence of fingerprint hole Mura.

[0052] Optionally, the surface of the non-hole area has a micro-nano structure for changing the reflection path and scattering characteristics of light. Micro-nano structures can be set on the surface of the non-hole area to further improve the optical performance. These micro-nano structures can be tiny protrusions, depressions or specific patterns, such as micron- or nano-scale grids, dots or ripples. These structures can effectively reduce the concentrated reflection of reflected light and avoid uneven brightness caused by reflectivity differences by changing the reflection path and scattering characteristics of light. By setting micro-nano structures on the surface of the non-hole area, the reflection path and scattering characteristics of light can be changed. These micro-nano structures can scatter the incident light into multiple directions, reduce the strong reflected light in a single direction, and thus make the distribution of reflected light in different directions more uniform. In this way, the reflectivity difference between the fingerprint hole area and the non-hole area can be effectively reduced, and uneven brightness can be avoided, thereby reducing the generation of fingerprint hole Mura phenomenon.

[0053] Optionally, titanium oxide or zinc oxide particles are added to the material of the non-hole area to adjust the reflectivity. Due to their high refractive index and excellent optical properties, these particles can effectively adjust the reflective properties of the material so that the reflectivity of the hole area and the non-hole area is closer. By adding titanium oxide or zinc oxide particles to the non-hole area material, the high refractive index characteristics of these particles can be used to adjust the optical reflective properties of the material. Titanium oxide and zinc oxide particles can effectively scatter and reflect incident light, thereby reducing strong reflected light in a single direction and making the reflected light more evenly distributed. This adjustment can make the reflectivity of the hole area and the non-hole area closer, thereby avoiding the uneven brightness caused by the difference in reflectivity and reducing the occurrence of fingerprint hole Mura.

[0054] In summary, the adhesive backing structure of the display module provided in this embodiment adopts gray silicone gel in the non-porous area and forms a gradient color design, so that the light is diffusely reflected in the non-porous area, the reflection intensity is weakened, and the difference in reflectivity between the fingerprint hole area and the non-porous area is reduced, thereby reducing the probability of the occurrence of fingerprint hole Mura. By setting white or gray grid texture glue on the surface of the non-porous area, the light can be further scattered, the reflection intensity is weakened, the display effect is improved, and the occurrence of fingerprint hole Mura is reduced. By adding micro-nano structures and titanium oxide or zinc oxide particles to the surface of the non-porous area, the reflection path and scattering characteristics of the light can be changed, the concentrated reflection of the reflected light can be reduced, the reflected light can be distributed more evenly, the difference in reflectivity between the fingerprint hole area and the non-porous area can be reduced, the brightness unevenness phenomenon can be effectively avoided, and the occurrence of fingerprint hole Mura can be further reduced. Therefore, the design of the adhesive backing structure comprehensively utilizes a variety of technical means, effectively improves the display effect and stability, enhances the user experience, and provides comprehensive optimization for the performance of the display module.

[0055] The utility model further provides a display module, comprising a back adhesive layer, wherein the back adhesive layer comprises the back adhesive structure of the display module in any one of the above embodiments, which will not be described in detail herein.

[0056] The utility model further provides a display panel, comprising a back adhesive layer, wherein the back adhesive layer comprises the back adhesive structure of the display module in any one of the above embodiments, which will not be described in detail herein.

[0057] The utility model also provides a display device, which includes the above-mentioned display panel, which will not be described in detail here.

[0058] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in different embodiments may be combined with each other.

[0059] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A back glue structure of a display module, the back glue structure comprising an open hole area and a non-hole area, characterized in that: The open hole area is a clear area, and the non-hole area includes at least two layers of structure, and different layers are made of different materials, and the materials used include one of black foam, gray foam, PET or silicone gel material.

2. The adhesive backing structure of the display module according to claim 1, characterized in that: The non-porous area has a gradient color, transitioning from black to gray or light color.

3. The adhesive backing structure of the display module according to claim 1, characterized in that: A layer of the non-hole area close to the display module is provided with white or gray grid-textured glue.

4. The adhesive backing structure of the display module according to claim 1, characterized in that: The non-porous area comprises a two-layer structure, and the bottom layer material in the non-porous area away from the display module is made of one of black foam, PET or silicone gel.

5. The adhesive backing structure of the display module according to claim 1, characterized in that: The surface of the non-porous area has a micro-nano structure.

6. The adhesive backing structure of the display module according to claim 1, characterized in that: Titanium oxide or zinc oxide particles are added into the material of the non-porous area.

7. A display module, comprising a back adhesive layer, characterized in that: The adhesive layer comprises the adhesive structure of the display module according to any one of claims 1 to 6.

8. A display panel, comprising a back adhesive layer, characterized in that: The adhesive layer comprises the adhesive structure of the display module according to any one of claims 1 to 6.

9. A display device, characterized in that: The display device comprises the display panel according to claim 8.

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