Backlight module, liquid crystal panel and electronic device
By using a low-tack adhesive layer to bond the reflective sheet in the backlight module, the deformation problem of the reflective sheet caused by environmental influences in large-size LCD terminal products is solved, and the stability and lifespan of the reflective sheet are extended.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING XIAOMI MOBILE SOFTWARE CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-07-10
AI Technical Summary
In large-size LCD terminal products, the reflective sheet undergoes significant deformation under environmental influences, leading to wrinkles in the reflective sheet.
The reflector sheet is bonded using a low-tack adhesive layer. The low adhesive strength of the low-tack layer reduces the tensile stress on the reflector sheet under high-temperature conditions, thereby reducing the degree of wrinkling.
It effectively reduces the wrinkling of the reflector under high temperature conditions, and improves the stability and service life of the reflector.
Smart Images
Figure CN224480636U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of electronic products, and more particularly to a backlight module, a liquid crystal panel, and an electronic device. Background Technology
[0002] With the development of technology, LCD (Liquid Crystal Display) technology has become increasingly mature, and its application in mobile phones, tablets, and other terminal products has become more and more widespread. Currently, as LCD sizes continue to increase, the shrinkage and stretching deformation of the reflective sheet also increases due to environmental influences. Utility Model Content
[0003] This disclosure provides a backlight module, a liquid crystal panel, and an electronic device to address the shortcomings of related technologies.
[0004] According to a first aspect of the present disclosure, a backlight module is provided, comprising:
[0005] Light guide plate;
[0006] Back cover;
[0007] A reflective sheet is located between the light guide plate and the back cover, along the thickness direction of the backlight module.
[0008] A low-tack adhesive layer is bonded between the reflective sheet and the back cover, wherein the shrinkage rate of the reflective sheet is greater than the shrinkage rate of the low-tack adhesive layer.
[0009] Optionally, the backlight module further includes a high-viscosity adhesive layer with light-absorbing function. Along the thickness direction of the backlight module, the high-viscosity adhesive layer is located between the light guide plate and the back cover, and adheres to the light guide plate.
[0010] Optionally, the high-viscosity adhesive layer is bonded to the light guide plate and the back cover.
[0011] Optionally, the low-tack adhesive layer and the high-tack adhesive layer are spaced apart;
[0012] Alternatively, the low-tack adhesive layer is bonded to the high-tack adhesive layer.
[0013] Optionally, the low-tack adhesive layer extends beyond the reflective sheet, and at least a portion of the high-tack adhesive layer is bonded between the light guide plate and the portion of the low-tack adhesive layer extending beyond the reflective sheet.
[0014] Optionally, the high-viscosity adhesive layer is bonded to two adjacent and interconnected surfaces of the light guide plate; and / or, the high-viscosity adhesive layer and the reflective sheet are spaced apart.
[0015] Optionally, the high-viscosity adhesive layer includes a high-viscosity pressure-sensitive adhesive layer and a light-absorbing material, wherein the light-absorbing material is incorporated into the high-viscosity pressure-sensitive adhesive layer, and the low-viscosity adhesive layer includes a low-viscosity pressure-sensitive adhesive layer.
[0016] Optionally, the particle density of the low-tack adhesive layer is not less than 28 / mm². 2 And not greater than 30.4 / mm 2 ; and / or, the particle density of the high-viscosity adhesive layer is not less than 48 / mm². 2 and not greater than 60 / mm 2 .
[0017] According to a second aspect of the present disclosure, a liquid crystal panel is provided, including the backlight module as described above.
[0018] According to a third aspect of the present disclosure, an electronic device is provided, including a liquid crystal panel as described above.
[0019] As can be seen from the above embodiments, the backlight module of this disclosure uses a low-tack adhesive layer to bond the reflective sheet. By utilizing the low adhesive strength characteristics of the low-tack adhesive layer, the pulling effect of the low-tack adhesive layer on the reflective sheet can be reduced when the reflective sheet shrinks in a high-temperature environment, thereby effectively reducing the degree of wrinkling of the reflective sheet.
[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description
[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this specification and, together with the description, serve to explain the principles of this specification.
[0022] Figure 1 This is a partial schematic diagram of a backlight module according to an exemplary embodiment.
[0023] Figure 2 This is a partial schematic diagram of a backlight module according to another exemplary embodiment.
[0024] Figure 3 This is a partial schematic diagram of a backlight module according to another exemplary embodiment.
[0025] Figure 4 This is a partial schematic diagram of a liquid crystal panel according to an exemplary embodiment.
[0026] Figure 5 This is a partial schematic diagram of a liquid crystal panel according to another exemplary embodiment. Detailed Implementation
[0027] The technical solutions in the embodiments (or "implementations") of this disclosure will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.
[0028] If this disclosure uses terms relating to directional indications or positional relationships (e.g., up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, terms such as "first" and "second" in this disclosure are used only for descriptive convenience and should not be construed as indicating or implying relative importance.
[0029] Figure 1 This is a partial schematic diagram of a backlight module according to an exemplary embodiment. Figure 2 This is a partial schematic diagram of a backlight module according to another exemplary embodiment. Figure 1 and Figure 2 As shown, the backlight module of this disclosure includes a light guide plate 1, a back cover 2, a reflective sheet 3, and a low-tack adhesive layer 4. Along the thickness direction of the backlight module, the reflective sheet 3 is located between the light guide plate 1 and the back cover 2, and the low-tack adhesive layer 4 bonds the reflective sheet 3 and the back cover 2. The shrinkage rate of the reflective sheet 3 is greater than that of the low-tack adhesive layer 4. Thus, when the reflective sheet 3 shrinks under high-temperature conditions, the low-tack adhesive layer 4's low adhesive strength reduces the pulling effect on the reflective sheet 3, thereby effectively reducing the wrinkling degree of the reflective sheet 3.
[0030] It is understood that in the above embodiments, the shrinkage rate of the reflector 3 refers to the ratio between the dimensional change of the reflector 3 under high temperature environment and the original size of the reflector 3 at room temperature. For example, if the original size of the reflector 3 at room temperature is A, and the size of the reflector 3 after shrinkage at high temperature is B, then the dimensional change of the reflector 3 under high temperature environment is AB. Therefore, the shrinkage rate of the reflector 3 is (AB) / A*).
[0031] The concept of shrinkage rate of the low-tack adhesive layer 4 is also as described above. After the backlight module is actually installed and applied, the environment where the reflector 3 is located will switch between high temperature and normal temperature, and the reflector 3 will shrink and recover accordingly. During this process, the adhesion between the low-tack adhesive layer 4 and the reflector 3 is always within the effective adhesion range. In other words, the tensile force required for the adhesion between the low-tack adhesive layer 4 and the reflector 3 to fail is greater than the force generated by the shrinkage of the reflector 3.
[0032] The particle density of the low-tack adhesive layer 4 is not less than 28 / mm. 2 And not greater than 30.4 / mm 2 This ensures that the adhesive strength between the low-tack adhesive layer 4 and the reflective sheet 3 meets the requirements while reducing the pulling effect of the low-tack adhesive layer 4 on the reflective sheet 3. For example, if the particle density of the low-tack adhesive layer 4 is less than 28 / mm²... 2 If the low-tack adhesive layer 4 has an excessively low bonding strength with the reflective sheet 3, the adhesive effect of the low-tack adhesive layer 4 on the reflective sheet 3 may fail during the shrinkage of the reflective sheet 3. Furthermore, if the particle density of the low-tack adhesive layer 4 is greater than 30.4 / mm², the bonding strength may be insufficient. 2 If this happens, the adhesion strength between the low-tack adhesive layer 4 and the reflective sheet 3 will be too high. During the shrinkage of the reflective sheet 3, the low-tack adhesive layer 4 will pull the reflective sheet 3 to a large extent, causing the reflective sheet 3 to wrinkle.
[0033] The backlight module may also include a high-adhesion adhesive layer 5 with light-absorbing function. Along the thickness direction of the backlight module, the high-adhesion adhesive layer 5 is located between the light guide plate 1 and the back cover 2, and adheres to the light guide plate 1 to absorb light leakage at the edge of the light guide plate 1. Due to the high adhesive strength of the high-adhesion adhesive layer 5, it can firmly fix the light guide plate 1 and prevent the light guide plate 1 from moving.
[0034] Regarding the high-viscosity adhesive layer 5, in some embodiments, the low-viscosity adhesive layer 4 extends beyond the reflective sheet 3, with at least a portion of the high-viscosity adhesive layer 5 bonded between the light guide plate 1 and the portion of the low-viscosity adhesive layer 4 extending beyond the reflective sheet 3. This arrangement eliminates the need to excessively concern oneself with the coating range of the low-viscosity adhesive layer 4, improving coating efficiency. Furthermore, the high adhesive strength of the high-viscosity adhesive layer 5 effectively reduces the probability of delamination between the high-viscosity adhesive layer 5 and the low-viscosity adhesive layer 4.
[0035] In this embodiment, the high-viscosity adhesive layer 5 can be completely bonded between the light guide plate 1 and the portion of the low-viscosity adhesive layer 4 that extends beyond the reflective sheet 3; of course, a portion of the high-viscosity adhesive layer 5 can also extend beyond the light guide plate 1, and the portion of the low-viscosity adhesive layer 4 that extends beyond the reflective sheet 3 can extend to the edge of the high-viscosity adhesive layer 5. The following description uses the example of a portion of the high-viscosity adhesive layer 5 extending beyond the light guide plate 1.
[0036] The high-adhesion adhesive layer 5 is bonded to two adjacent and interconnected surfaces of the light guide plate 1. In other words, a portion of the high-adhesion adhesive layer 5 extends beyond the edge of the light guide plate 1. The high-adhesion adhesive layer 5 is bonded to both one side of the light guide plate 1 facing the back cover 2 in the thickness direction of the backlight module and another side adjacent to and connected to that side. That is to say, the high-adhesion adhesive layer 5 covers a portion of the edge of the light guide plate 1. This arrangement improves the light absorption effect of the high-adhesion adhesive layer 5 on the light guide plate 1.
[0037] When applying the high-viscosity adhesive layer 5, the high-viscosity adhesive layer 5 may experience some flow during solidification. Therefore, in order to ensure that the high-viscosity adhesive layer 5 has flow space during solidification, the high-viscosity adhesive layer 5 and the reflective sheet 3 are spaced apart.
[0038] Figure 3 This is a partial schematic diagram of a backlight module according to another exemplary embodiment, such as... Figure 2 and Figure 3 As shown, in some other embodiments, the high-viscosity adhesive layer 5 is bonded to the light guide plate 1 and the rear shell 2 respectively, so that the light guide plate 1 can be more stably fixed to the rear shell 2 through the high-viscosity adhesive layer 5. In this embodiment, the low-viscosity adhesive layer 4 can be bonded to the high-viscosity adhesive layer 5 or spaced apart from the high-viscosity adhesive layer 5, and this disclosure does not impose any limitations on this.
[0039] It is worth noting that in embodiments where the low-tack adhesive layer 4 and the high-tack adhesive layer 5 are spaced apart, the low-tack adhesive layer 4 may extend beyond the reflective sheet 3, or the edge of the low-tack adhesive layer 4 may be flush with the edge of the reflective sheet 3. However, in embodiments where the low-tack adhesive layer 4 is bonded to the high-tack adhesive layer 5, the low-tack adhesive layer 4 extends beyond the reflective sheet 3.
[0040] The particle density of the high-viscosity adhesive layer 5 is not less than 48 / mm. 2 and not greater than 60 / mm 2 This allows the high-viscosity adhesive layer 5 to firmly bond to the light guide plate 1. For example, if the particle density of the high-viscosity adhesive layer 5 is less than 48 / mm²... 2 If the adhesive strength between the high-viscosity adhesive layer 5 and the light guide plate 1 is too low, it can easily lead to the failure of the light guide plate 1 to fix and cause displacement, and may also cause light leakage from the light guide plate 1. If the particle density of the high-viscosity adhesive layer 5 is greater than 60 / mm², this will also cause problems. 2This excessively high adhesive strength between the high-viscosity adhesive layer 5 and the light guide plate 1 makes it difficult for even small relative displacements to be generated between them to release stress and buffer collisions. Consequently, stress concentration occurs at the high-viscosity adhesive layer 5, increasing the risk of stress cracking or deformation failure of the light guide plate 1. Furthermore, the excessively high adhesive strength between the high-viscosity adhesive layer 5 and the light guide plate 1 also makes it difficult to separate the light guide plate 1, increasing the difficulty of adjusting and repairing the light guide plate 1.
[0041] The high-tack adhesive layer 5 includes a high-tack pressure-sensitive adhesive layer and a light-absorbing material, wherein the light-absorbing material is incorporated into the high-tack pressure-sensitive adhesive layer. The low-tack adhesive layer 4 includes a low-tack pressure-sensitive adhesive layer. It is worth noting that the light-absorbing material can be gray, black, or other colors, and this disclosure does not impose any limitations on it.
[0042] Figure 4 This is a partial schematic diagram of a liquid crystal panel according to an exemplary embodiment. Figure 5 This is a partial schematic diagram of a liquid crystal panel according to another exemplary embodiment. Figure 4 and Figure 5 As shown, this disclosure also provides a liquid crystal panel, including the backlight module as described in any of the preceding embodiments. This liquid crystal panel can be applied to scenarios such as mobile terminals, wearable devices, smart homes, and computer terminals, and this disclosure does not impose any limitations on it.
[0043] Accordingly, this disclosure also provides an electronic device, including a liquid crystal panel as described in any of the preceding embodiments. This electronic device may include mobile terminals, wearable devices, smart home devices, computer terminals, etc., and this disclosure does not impose any limitations thereon.
[0044] It should be noted that the technical solutions or features described in the above embodiments can be combined or complemented by each other without conflict. The scope of protection of this disclosure is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.
Claims
1. A backlight module, characterized in that, include: Light guide plate (1); Rear shell (2); A reflective sheet (3) is located between the light guide plate (1) and the back cover (2) along the thickness direction of the backlight module. A low-tack adhesive layer (4) is bonded between the reflective sheet (3) and the back shell (2), wherein the shrinkage rate of the reflective sheet (3) is greater than the shrinkage rate of the low-tack adhesive layer (4).
2. The backlight module according to claim 1, characterized in that, The backlight module also includes a high-viscosity adhesive layer (5) with light-absorbing function. Along the thickness direction of the backlight module, the high-viscosity adhesive layer (5) is located between the light guide plate (1) and the back shell (2) and adheres to the light guide plate (1).
3. The backlight module according to claim 2, characterized in that, The high-viscosity adhesive layer (5) is bonded to the light guide plate (1) and the back shell (2).
4. The backlight module according to claim 3, characterized in that, The low-viscosity adhesive layer (4) and the high-viscosity adhesive layer (5) are provided at intervals; Alternatively, the low-tack adhesive layer (4) is bonded to the high-tack adhesive layer (5).
5. The backlight module according to claim 2, characterized in that, The low-tack adhesive layer (4) extends beyond the reflective sheet (3), and at least a portion of the high-tack adhesive layer (5) is bonded between the light guide plate (1) and the portion of the low-tack adhesive layer (4) extending beyond the reflective sheet (3).
6. The backlight module according to claim 2, characterized in that, The high-viscosity adhesive layer (5) is bonded to two adjacent and interconnected surfaces of the light guide plate (1); and / or, the high-viscosity adhesive layer (5) and the reflective sheet (3) are spaced apart.
7. The backlight module according to claim 2, characterized in that, The high-viscosity adhesive layer (5) includes a high-viscosity pressure-sensitive adhesive layer and a light-absorbing material, wherein the light-absorbing material is incorporated into the high-viscosity pressure-sensitive adhesive layer, and the low-viscosity adhesive layer (4) includes a low-viscosity pressure-sensitive adhesive layer.
8. The backlight module according to claim 2, characterized in that, The particle density of the low-viscosity adhesive layer (4) is not less than 28 / mm². 2 And not greater than 30.4 / mm 2 ; and / or, the particle density of the high-viscosity adhesive layer (5) is not less than 48 / mm². 2 and not greater than 60 / mm 2 .
9. A liquid crystal panel, characterized in that, Includes the backlight module as described in any one of claims 1 to 8.
10. An electronic device, characterized in that, Including the liquid crystal panel as described in claim 9.