Liquid crystal display panel curved surface backlight module and production process

Abstract

The application discloses a kind of liquid crystal display panel curved surface backlight module and production process, belong to liquid crystal display panel technical field.A kind of liquid crystal display panel curved surface backlight module and production process, including metal backboard, metal backboard inner surface is sequentially provided with reflector, light guide plate, lamp plate and transparent conductive film, the periphery of metal backboard is provided with press plate, press plate is respectively connected with the edge of reflector, light guide plate, lamp plate and transparent conductive film.The liquid crystal display panel curved surface backlight module and production process proposed in the application, by setting up the heat sink with wavy inner plate and outer plate, and setting up limiting slot and heat dissipation hole on the metal backboard, enhance the overall heat dissipation efficiency, in addition, introduce cooling pipeline, further improve the heat dissipation performance, ensure that even in high load condition can effectively dissipate heat, prolong the service life of equipment;Lamp plate adopts segmented structure, avoid bending when stress concentration leads to local bonding failure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal display panel, in particular to a liquid crystal display panel curved backlight module and production process. BACKGROUND

[0002] Liquid crystal display (LCD) is widely used in various electronic devices due to its high resolution, low power consumption and cost-effectiveness. In order to improve the display effect, especially the contrast ratio and brightness uniformity, the design of backlight module becomes crucial. The existing curved backlight module has the following defects: the peeling of the lamp plate and the light guide plate, the stress concentration during bending leads to local bonding failure; the warping of the transparent conductive film, the long-term bending stress causes Newton's ring or micro-cracks in the diffusion film / prism film, affecting the optical effect; the limited heat dissipation path: the curved structure hinders the heat diffusion, the LED junction temperature rises, and the light decay accelerates. SUMMARY

[0003] The purpose of the present application is to provide a liquid crystal display panel curved backlight module and production process, by setting a heat sink with a wavy inner plate and an outer plate, and opening a limiting groove and a heat dissipation hole on the metal back plate, the overall heat dissipation efficiency is enhanced, in addition, the cooling pipeline is introduced, which further improves the heat dissipation performance, ensures effective heat dissipation even under high load conditions, prolongs the service life of the equipment, and solves the problems raised in the above background technology.

[0004] To achieve the above purpose, the present application provides the following technical scheme: a liquid crystal display panel curved backlight module, comprising a metal back plate, the metal back plate is a curved structure formed by stamping aluminum alloy, the inner surface of the metal back plate is sequentially provided with a reflective sheet, a light guide plate, a lamp plate and a transparent conductive film, the periphery of the metal back plate is provided with a pressing plate, the pressing plate is connected with the edges of the reflective sheet, the light guide plate, the lamp plate and the transparent conductive film respectively, for fixing the reflective sheet, the light guide plate, the lamp plate and the transparent conductive film, the reflective sheet, the light guide plate, the lamp plate and the transparent conductive film are all curved structures, the material of the light guide plate is UV cured resin, the curved net point is copied by a mold, and the net point density is dynamically adjusted according to the curvature; the side of the reflective sheet close to the metal back plate is provided with a heat sink, the heat sink penetrates through the reflective sheet and contacts with the metal back plate.

[0005] Preferably, the periphery of the reflective sheet is locally bonded in the pressing plate by hot melt adhesive, the surface of the side of the reflective sheet close to the light guide plate is provided with a reflective layer, the side of the reflective sheet away from the reflective layer is embedded with a heat sink, the heat sink is a continuous wavy structure, and the heat sink absorbs the heat of the reflective sheet and the light guide plate.

[0006] Preferably, the heat dissipation plate comprises an inner plate and an outer plate, the inner plate and the outer plate are arranged in parallel, and the inner plate and the outer plate are both wave-shaped metal plates, the adjacent side of the inner plate and the outer plate is embedded into the reflecting sheet, the wave-shaped structure increases the contact area with the reflecting sheet, and the heat dissipation effect is enhanced, the other side of the outer plate is connected with the inner wall of the metal back plate, and the outer plate and the inner plate jointly support the reflecting sheet and the metal back plate, so that the metal back plate and the reflecting sheet are left with a certain heat dissipation space.

[0007] Preferably, the metal back plate is provided with a limiting groove in contact with the outer plate, and the depth of the limiting groove is 0.5-1 mm, so that the contact area of the outer plate and the metal back plate is increased, the heat on the outer plate is beneficial to being conducted to the metal back plate, and the heat is further dissipated through the metal back plate, and the metal back plate is provided with a heat dissipation hole, so that the heat dissipation effect is improved.

[0008] Preferably, the gap between the heat dissipation plate and the reflecting sheet is provided with a cooling pipeline, the cooling pipeline comprises parallel arranged water inlet pipes, water outlet pipes and connecting short pipes, the water inlet pipes and the water outlet pipes are respectively communicated with one end of the connecting short pipes, and one end of the water inlet pipes and the water outlet pipes is connected with a circulating pipeline arranged outside the liquid crystal display panel curved backlight module.

[0009] Preferably, the pressing plate is provided with a clamping groove, the clamping groove is clamped and connected with the edge of the transparent conductive film, one side of the clamping groove is fixedly connected with an air cushion buffer layer, the air cushion buffer layer is close to the edge on one side of the transparent conductive film, the air cushion buffer layer provides uniform pressure, and the warping of the transparent conductive film is prevented.

[0010] Preferably, the lamp plate comprises flexible FPC substrates, Mini LEDs and segmented gaps, the segmented gaps are arranged between the flexible FPC substrates, the Mini LEDs are arranged on the surface of the flexible FPC substrates, and the flexible FPC substrates are bonded with the light guide plate through heat-conducting pressure-sensitive adhesive.

[0011] Preferably, the segmented gap is a trapezoidal structure, the opening is directed to the metal back plate, and the flexible FPC substrate is not in contact when being bent, so that the Mini LED is prevented from being damaged by extrusion.

[0012] Preferably, the end of the flexible FPC substrate is provided with a wave-shaped end edge, the deformation freedom is increased, and a micro groove is arranged on the flexible FPC substrate between the Mini LEDs, so that the deformation range of the flexible FPC substrate is improved, and the Mini LED is prevented from being damaged by extrusion.

[0013] Another technical problem to be solved by the present application is to provide a production process of the liquid crystal display panel curved backlight module, which comprises the following steps:

[0014] Step one: UV resin is injected into a curved mold, dynamic dots are formed through nano-imprinting technology, and the light guide plate is demolded after ultraviolet curing;

[0015] Step two: process the lamp plate and coat the back of the lamp plate with heat-conducting pressure-sensitive adhesive to the light guide plate;

[0016] Step three: place the reflective sheet with the heat sink plate on the metal back plate, use hot melt adhesive to locally bond the four sides of the reflective sheet, and ensure that the middle part is not fixed to provide a heat dissipation space;

[0017] Step four: place the prepared light guide plate on the reflective sheet, ensure that its curvature matches the metal back plate, and finally cover the transparent conductive film on the entire assembly to ensure that the edges are tightly fitted and the middle is not bonded.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The liquid crystal display panel curved backlight module and production process provided by the present application have the heat sink plate with the wavy inner plate and outer plate, and the limiting groove and the heat dissipation hole are formed on the metal back plate, which enhances the overall heat dissipation efficiency. In addition, the cooling pipeline is introduced, which further improves the heat dissipation performance, ensures effective heat dissipation even under high load conditions, and prolongs the service life of the equipment. The entire backlight module adopts a curved structure design, including a metal back plate, a reflective sheet, a light guide plate, a lamp plate and a transparent conductive film, which ensures good matching with the curved display screen and provides better visual experience. The lamp plate adopts a segmented structure to avoid stress concentration during bending, which leads to local bonding failure. The air cushion buffer layer is used to fix the edge of the transparent conductive film, which not only ensures the tight connection between the components, but also avoids damage to sensitive components, improves production efficiency and product reliability, and prevents the transparent conductive film from warping. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a whole structure diagram of the liquid crystal display panel curved backlight module of the present application;

[0021] Figure 2 It is a cross-sectional view of the liquid crystal display panel curved backlight module of the first embodiment of the present application;

[0022] Figure 3 It is an enlarged view of A of the present application;

[0023] Figure 4 It is an internal structure diagram of the metal back plate of the present application;

[0024] Figure 5 It is an enlarged view of B of the present application;

[0025] Figure 6 It is a lamp plate structure diagram of the present application;

[0026] Figure 7 It is a cross-sectional view of the liquid crystal display panel curved backlight module of the second embodiment of the present application;

[0027] Figure 8 Figure 2 is a cooling pipe and heat sink connection structure diagram of an embodiment of the present application

[0028] In the figure: 1, metal back plate; 11, pressing plate; 111, clamping groove; 112, air cushion buffer layer; 12, limiting groove; 13, heat dissipation hole; 2, reflecting sheet; 21, reflecting layer; 22, heat sink; 221, inner plate; 222, outer plate; 23, cooling pipe; 231, water inlet pipe; 232, water outlet pipe; 233, connecting short pipe; 3, light guide plate; 4, lamp plate; 41, flexible FPC substrate; 411, wavy end edge; 412, micro groove; 42, Mini LED; 43, segmented gap; 5, transparent conductive film. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Embodiment one:

[0031] In order to solve the problems of peeling of the existing lamp plate and light guide plate, stress concentration during bending leading to local failure of adhesion, warping of the transparent conductive film, long-term bending stress causing Newton's ring or micro-cracks in the diffusion film / prism film, affecting the optical effect, and limited heat dissipation path: curved structure hindering heat diffusion, high LED junction temperature, and accelerated light decay, please refer to Figures 1-6 The technical solutions provided in the present embodiment are as follows:

[0032] A liquid crystal display panel curved backlight module, comprising a metal back plate 1, the metal back plate 1 is a curved structure formed by stamping an aluminum alloy, and the inner surface of the metal back plate 1 is sequentially provided with a reflecting sheet 2, a light guide plate 3, a lamp plate 4, and a transparent conductive film 5. The metal back plate 1 is provided with a pressing plate 11 around the periphery, and the pressing plate 11 is connected with the edges of the reflecting sheet 2, the light guide plate 3, the lamp plate 4, and the transparent conductive film 5, respectively, for fixing the reflecting sheet 2, the light guide plate 3, the lamp plate 4, and the transparent conductive film 5. The reflecting sheet 2, the light guide plate 3, the lamp plate 4, and the transparent conductive film 5 are all curved structures. The light guide plate 3 is made of UV-cured resin, and the curved net points are copied by a mold, and the net point density is dynamically adjusted according to the curvature.

[0033] Specifically, the reflecting sheet 2 is provided with a reflecting layer 21 on the side surface close to the light guide plate 3, and a heat dissipation plate 22 is embedded in the side of the reflecting sheet 2 away from the reflecting layer 21. The heat dissipation plate 22 absorbs the heat of the reflecting sheet 2 and the light guide plate 3, and includes an inner plate 221 and an outer plate 222. The inner plate 221 and the outer plate 222 are arranged in parallel, and both the inner plate 221 and the outer plate 222 are wave-shaped metal plates. The side of the inner plate 221 and the outer plate 222 adjacent to each other is embedded into the reflecting sheet 2. The wave-shaped structure increases the contact area with the reflecting sheet 2 and enhances the heat dissipation effect. In addition, the other side of the outer plate 222 is connected with the inner wall of the metal back plate 1. The reflecting sheet 2 is locally bonded in the pressing plate 11 through the hot melt adhesive. The middle part of the reflecting sheet 2 is not fixedly connected. The outer plate 222 and the inner plate 221 jointly support the reflecting sheet 2 and the metal back plate 1, so that the metal back plate 1 and the reflecting sheet 2 leave a certain heat dissipation space. The wave-shaped structure of the outer plate 222 and the inner plate 221 can allow a certain deformation of the reflecting sheet 2 to release the thermal expansion stress.

[0034] In order to improve the stability of the reflecting sheet 2, a limiting groove 12 is formed on the metal back plate 1 and in contact with the outer plate 222. The depth of the limiting groove 12 is 0.1-1mm. The position of the outer plate 222 is not fixed, but can be limited to a certain extent to prevent the reflecting sheet 2 from deforming too much. At the same time, the limiting groove 12 increases the contact area between the outer plate 222 and the metal back plate 1, which is conducive to the conduction of heat on the outer plate 222 to the metal back plate 1 and further heat dissipation through the metal back plate 1. The metal back plate 1 is provided with a heat dissipation hole 13 to improve the heat dissipation effect.

[0035] The pressing plate 11 is provided with a clamping groove 111, which is clamped and connected with the edge of the transparent conductive film 5. One side of the clamping groove 111 is fixedly connected with an air cushion buffer layer 112, which is close to the edge of one side of the transparent conductive film 5. The air cushion buffer layer 112 provides uniform pressure to prevent the transparent conductive film 5 from warping.

[0036] The lamp plate 4 includes a flexible FPC substrate 41 and a Mini LED 42. The flexible FPC substrate 41 is distributed in segments, and a segmented gap 43 is arranged between the flexible FPC substrates 41. Each segment of the flexible FPC substrate 41 is welded with a Mini LED 42. The flexible FPC substrate 41 is bonded with the light guide plate 3 through a heat-conducting pressure-sensitive adhesive. The segmented gap 43 is in a trapezoidal structure and provides a bending deformation space. Adjacent segments are not in contact when bending to avoid extrusion damage to the Mini LED 42. The end of the flexible FPC substrate 41 is provided with a wave-shaped end edge 411 to increase the degree of freedom of deformation. In addition, a micro groove 412 is formed on the flexible FPC substrate 41 between the Mini LEDs 42 to increase the deformation range of the flexible FPC substrate 41 and avoid extrusion damage to the Mini LED 42.

[0037] The transparent conductive film 5 at least comprises a metal composite film, a diffusion film, a prism film and a brightness enhancement film, wherein the metal composite film adopts a composite film containing a metal mesh, a micron-level metal mesh is embedded in a transparent substrate, is resistant to bending, is suitable for a curved screen, an edge of the film is tightly fixed by the air cushion buffer layer 112 and the clamping groove 111, and the middle part is not bonded.

[0038] In order to better show the production process of the curved backlight module of the liquid crystal display panel, the present embodiment proposes a production process of the curved backlight module of the liquid crystal display panel, comprising the following steps:

[0039] Step one: inject UV resin into a curved mold, form dynamic dots by nano-imprinting technology, demold after ultraviolet curing, and manufacture a light guide plate 3;

[0040] Step two: attach MiniLEDs 42 on a flexible FPC substrate 41, open a wave-shaped end edge 411 and a micro groove 412 on the flexible FPC substrate 41, open a segmented gap 43, segment the flexible FPC substrate 41, and coat a heat-conducting pressure-sensitive adhesive on the back of the flexible FPC substrate 41 and bond it to the light guide plate 3;

[0041] Step three: open a limiting groove 12 and a heat dissipation hole 13 on a metal back plate 1, for fixing the position of a heat dissipation plate 22 and improving the heat dissipation effect, place a reflective sheet 2 with a reflective layer 21 and the heat dissipation plate 22 on the metal back plate 1, use hot melt adhesive to locally bond the periphery of the reflective sheet 2, and ensure that the middle part is not fixed to provide a heat dissipation space;

[0042] Step four: place the manufactured light guide plate 3 on the reflective sheet 2, ensure that the curvature matches the metal back plate, and finally cover a transparent conductive film 5 on the entire assembly, and fix it by using the clamping groove 111 and the air cushion buffer layer 112 on the pressing plate 11, to ensure that the edge is tightly attached and the middle part is not bonded.

[0043] Example two:

[0044] Please refer to Figures 7-8In the embodiment, the metal back plate 1 is not provided with the heat dissipation holes 13, but is provided with the cooling pipes 23 in the interspace between the heat dissipation plate 22 and the reflective sheet 2. The cooling pipes 23 include the parallelly arranged water inlet pipe 231 and water outlet pipe 232, and the connecting short pipe 233 connecting the water inlet pipe 231 and the water outlet pipe 232. The connecting short pipe 233 is in a curved surface structure matching the metal back plate 1, and is inserted into the wave shape of the inner plate 221. The heat in the metal back plate 1 is absorbed by the connecting short pipe 233. One end of the water inlet pipe 231 and the water outlet pipe 232 is connected with the circulating pipe arranged outside the liquid crystal display panel curved surface backlight module. The circulating pipe cools the liquid crystal display panel curved surface backlight module by heat exchange. In the embodiment, the heat dissipation holes 13 are not provided, the sealing property of the liquid crystal display panel curved surface backlight module is better, and the water cooling is used to cool the liquid crystal display panel curved surface backlight module, so that the heat dissipation is faster.

[0045] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that are not specifically enumerated herein. Moreover, no limitation is intended to be present based on a particular embodiment or aspect of the application since the scope of the application is to be limited only by the claims that follow.

[0046] While the embodiments of the application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application.

Claims

1. A curved backlight module for a liquid crystal display panel, comprising a metal backplate (1), characterized in that: The inner surface of the metal back plate (1) is provided with a reflective sheet (2), a light guide plate (3), a lamp plate (4) and a transparent conductive film (5) in sequence. A pressing plate (11) is provided around the metal back plate (1). The pressing plate (11) is connected to the edges of the reflective sheet (2), the light guide plate (3), the lamp plate (4) and the transparent conductive film (5) respectively. A reflective layer (21) is provided on the side of the reflective sheet (2) close to the light guide plate (3). A heat sink plate (22) is embedded on the side of the reflective sheet (2) away from the reflective layer (21). The heat sink (22) is a continuous wave-shaped structure. The heat sink (22) includes an inner plate (221) and an outer plate (222). The inner plate (221) and the outer plate (222) are arranged in parallel. Both the inner plate (221) and the outer plate (222) are wave-shaped metal plates. The adjacent sides of the inner plate (221) and the outer plate (222) are embedded in the reflector (2). The other side of the outer plate (222) is connected to the inner wall of the metal back plate (1). The lamp plate (4) includes a flexible FPC substrate (41), a Mini LED (42) and a segment gap (43). The flexible FPC substrate (41) is provided with a segment gap (43). The surface of the flexible FPC substrate (41) is provided with a Mini LED (42). The flexible FPC substrate (41) is bonded to the light guide plate (3) by thermally conductive pressure-sensitive adhesive. The transparent conductive film (5) includes at least a metal composite film, a diffusion film, a prism film and a brightness enhancement film.

2. The curved backlight module for a liquid crystal display panel according to claim 1, characterized in that: The reflective sheet (2) is partially bonded to the pressure plate (11) around its perimeter by hot melt adhesive.

3. The curved backlight module for a liquid crystal display panel according to claim 2, characterized in that: The metal back plate (1) is provided with a limiting groove (12) that contacts the outer plate (222). The depth of the limiting groove (12) is 0.1-1mm. The metal back plate (1) is provided with heat dissipation holes (13).

4. The curved backlight module for a liquid crystal display panel according to claim 3, characterized in that: Cooling pipes (23) are provided in the gap between the heat sink (22) and the reflector (2). The cooling pipes (23) include a water inlet pipe (231), a water outlet pipe (232) and a connecting short pipe (233) arranged in parallel. The water inlet pipe (231) and the water outlet pipe (232) are respectively connected to one end of the connecting short pipe (233).

5. The curved backlight module for a liquid crystal display panel according to claim 4, characterized in that: The pressing plate (11) has a slot (111) that engages with the edge of the transparent conductive film (5). An air cushion buffer layer (112) is fixedly connected to one side of the slot (111).

6. The curved backlight module for a liquid crystal display panel according to claim 5, characterized in that: The segment gap (43) is a trapezoidal structure with the opening facing the metal back plate (1).

7. The curved backlight module for a liquid crystal display panel according to claim 6, characterized in that: The flexible FPC substrate (41) has a wavy edge (411) at its end, and a micro groove (412) is formed on the flexible FPC substrate (41) between the Mini LEDs (42).

8. A manufacturing process for a curved backlight module of a liquid crystal display panel as described in claim 7, characterized in that, Includes the following steps: Step 1: Inject UV resin into a curved mold, form dynamic dots through nanoimprinting technology, and demold after UV curing to make a light guide plate (3). Step 2: Process the lamp board (4) and coat the back of the lamp board (4) with thermally conductive pressure-sensitive adhesive and attach it to the light guide plate (3); Step 3: Place the reflector (2) with heat sink (22) on the metal back plate (1) and use hot melt adhesive to partially bond the reflector (2) around its perimeter; Step 4: Place the prepared light guide plate (3) on the reflector (2) to ensure that its curvature matches the metal back plate. Finally, cover the entire assembly with the transparent conductive film (5) to ensure that the edges fit tightly and there is no adhesive in the middle.

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