Liquid crystal display screen capable of preventing ITO (Indium Tin Oxide) touch pattern from being corroded

Abstract

The utility model discloses a liquid crystal display screen capable of preventing indium tin oxide (ITO) touch control patterns from being corroded, which comprises a lower polaroid, a large piece of glass, a small piece of glass, an upper polaroid and a cover plate which are sequentially overlapped from bottom to top, and the large piece of glass is longer than the small piece of glass and extends outwards to form a step. A step is arranged on the upper surface of the large piece of glass, a driving IC (integrated circuit) and an FPC (flexible printed circuit) are bound on the upper surface of the large piece of glass at the step, an ITO (indium tin oxide) touch pattern layer is arranged on the upper surface of the small piece of glass, a pressure-sensitive adhesive layer is arranged on the lower surface of the upper polaroid, the small piece of glass and the upper polaroid are adhered and fixed through the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is an acid-free pressure-sensitive adhesive. Due to the fact that the pressure-sensitive adhesive layer is the non-acid pressure-sensitive adhesive, the upper polaroid compounded with the non-acid pressure-sensitive adhesive layer is attached after the small piece of glass of the display screen is cleaned, and the problem that the function of a touch screen of a module is abnormal after a high-temperature and high-humidity reliability experiment is caused by the glue reaction of the ITO touch pattern layer above the small piece of glass and the upper polaroid is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display, and more specifically to a liquid crystal display screen which can prevent an ITO touch control pattern from being corroded. Background Art

[0002] With the improvement of living standards, smart wearable devices such as bracelets and watches are becoming more and more common, and product competition is becoming more and more fierce. Consumers are pursuing higher and higher standby time for products. The Oncell touch module can directly plate the touch ITO film layer on the display screen, replacing the film ITO structure of the external TP, effectively reducing the stacking thickness of the module to reserve space for the whole machine battery, and is widely used in wearable display modules. However, the Oncell touch module has received customer feedback from time to time that the touch function has abnormalities after reliability verification. After analysis, it was confirmed that the pressure-sensitive adhesive in the upper polarizer contains weak acid, which will corrode the ITO touch film layer above the display screen in reliability experiments such as high temperature and high humidity, resulting in poor touch function. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to prevent the ITO touch pattern from being corroded by the pressure-sensitive adhesive of the upper polarizer.

[0004] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0005] To solve the above technical problems, the utility model provides a liquid crystal display screen that prevents an ITO touch pattern from being corroded, comprising a lower polarizer, a large piece of glass, a small piece of glass, an upper polarizer and a cover plate that are stacked in sequence from bottom to top, the large piece of glass being longer than the small piece of glass and extending outward to form a step, a driver IC and an FPC being bound to the upper surface of the large piece of glass located at the step, an ITO touch pattern layer being provided on the upper surface of the small piece of glass, a pressure-sensitive adhesive layer being provided on the lower surface of the upper polarizer, the small piece of glass and the upper polarizer being adhered and fixed by the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer being an acid-free pressure-sensitive adhesive.

[0006] As a preferred embodiment of the liquid crystal display screen for preventing the ITO touch pattern from being corroded provided by the utility model, the FPC includes a substrate layer, a circuit layer arranged on the upper surface of the substrate layer, and a metal heat dissipation layer arranged on the lower surface of the substrate layer.

[0007] As a preferred embodiment of the liquid crystal display screen for preventing the ITO touch pattern from being corroded provided by the utility model, the FPC also includes at least one through-hole penetrating the substrate layer, the circuit layer and the metal heat dissipation layer, and the inner wall of the through-hole is provided with a thermal conductive layer in contact with the circuit layer and the metal heat dissipation layer.

[0008] As a preferred implementation of the liquid crystal display screen for preventing the ITO touch pattern from being corroded provided by the utility model, a heat conductor connected to an external heat conductive structure is arranged in the through hole, and the heat conductor is in contact with the heat conductive layer.

[0009] As a preferred implementation of the liquid crystal display screen for preventing the ITO touch pattern from being corroded provided by the utility model, the structure of the metal heat dissipation layer is a mesh structure, a strip structure, a wavy structure or a honeycomb structure.

[0010] As a preferred implementation mode of the liquid crystal display screen for preventing the ITO touch pattern from being corroded provided by the utility model, a protrusion is provided on the edge of the upper surface of the large piece of glass extending outward, and a buffer glue is provided on the upper surface of the large piece of glass between the protrusion and the small piece of glass, and the buffer glue is in contact with the cover plate.

[0011] As a preferred implementation of the liquid crystal display screen for preventing the ITO touch pattern from being corroded provided by the utility model, the upper surface of the protrusion is flush with the upper surface of the small piece of glass.

[0012] As a preferred implementation of the liquid crystal display screen for preventing the ITO touch pattern from being corroded provided by the utility model, the buffer glue is silicone glue.

[0013] As a preferred implementation of the liquid crystal display screen for preventing the ITO touch pattern from being corroded provided by the utility model, a rounded corner is arranged between the protrusion and the large piece of glass.

[0014] As a preferred implementation of the liquid crystal display screen for preventing the ITO touch pattern from being corroded provided by the utility model, the upper surface of the large piece of glass and the side surface of the protrusion are rough surfaces.

[0015] The utility model has the following beneficial effects:

[0016] Since the pressure-sensitive adhesive layer is an acid-free pressure-sensitive adhesive, by attaching the upper polarizer with the composite acid-free pressure-sensitive adhesive layer after cleaning the small piece of glass on the display screen, the glue reaction between the ITO touch pattern layer above the small piece of glass and the upper polarizer can be avoided to avoid the module having abnormal touch screen function after the high temperature and high humidity reliability test, thereby reducing the defective rate of LCD screens and improving product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 The utility model provides a structural schematic diagram of a liquid crystal display screen that prevents an ITO touch pattern from being corroded.

[0019] Figure 2 This is a schematic diagram of the structure of Example 2.

[0020] Figure 3 This is a schematic diagram of the structure of Example 3.

[0021] Description of Figure Numbers:

[0022] Lower polarizer 1; large glass 2; small glass 3; upper polarizer 4; cover plate 5; FPC 6; pressure-sensitive adhesive layer 7;

[0023] Base material layer 61; circuit layer 62; metal heat dissipation layer 63; through hole 64;

[0024] Protrusion 21; Buffer rubber 22. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] The utility model provides a liquid crystal display screen for preventing an ITO touch pattern from being corroded, comprising a lower polarizer, a large piece of glass, a small piece of glass, an upper polarizer and a cover plate which are sequentially stacked from bottom to top, wherein the large piece of glass is longer than the small piece of glass and extends outward to form a step, a driving IC and an FPC are bound to the upper surface of the large piece of glass located at the step, an ITO touch pattern layer is arranged on the upper surface of the small piece of glass, a pressure-sensitive adhesive layer is arranged on the lower surface of the upper polarizer, the small piece of glass and the upper polarizer are adhered and fixed by the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is an acid-free pressure-sensitive adhesive.

[0029] Since the pressure-sensitive adhesive layer is an acid-free pressure-sensitive adhesive, by attaching the upper polarizer with the composite acid-free pressure-sensitive adhesive layer after cleaning the small piece of glass on the display screen, the glue reaction between the ITO touch pattern layer above the small piece of glass and the upper polarizer can be avoided to avoid the module having abnormal touch screen function after the high temperature and high humidity reliability test, thereby reducing the defective rate of LCD screens and improving product competitiveness.

[0030] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention.

[0031] Example 1

[0032] See also Figure 1, a liquid crystal display screen for preventing an ITO touch pattern from being corroded is provided by the utility model, comprising a lower polarizer 1, a large glass 2, a small glass 3, an upper polarizer 4 and a cover plate 5 which are sequentially stacked from bottom to top, the large glass 2 being longer than the small glass 3 and extending outward to form a step, a driver IC and an FPC 6 being bound to the upper surface of the large glass 2 located at the step, an ITO touch pattern layer being provided on the upper surface of the small glass 3, a pressure-sensitive adhesive layer 7 being provided on the lower surface of the upper polarizer 4, the small glass 3 and the upper polarizer 4 being bonded and fixed by the pressure-sensitive adhesive layer 7, and the pressure-sensitive adhesive layer 7 being an acid-free pressure-sensitive adhesive. Since the pressure-sensitive adhesive layer 7 is an acid-free pressure-sensitive adhesive, after the small piece of glass 3 of the display screen is cleaned, the upper polarizer 4 with the composite acid-free pressure-sensitive adhesive layer 7 is attached to avoid the problem of abnormal touch screen function of the module after the high temperature and high humidity reliability test caused by the glue reaction between the ITO touch pattern layer above the small piece of glass 3 and the upper polarizer 4, thereby reducing the defective rate of the liquid crystal display screen and improving the competitiveness of the product.

[0033] Furthermore, the upper polarizer 4 is a laminated structure, the pressure-sensitive adhesive layer 7 is included in the laminated structure, and the laminated structure of the polarizer 4 is the pressure-sensitive adhesive layer 7, the first TAC layer, the PVA layer and the second TAC layer stacked in sequence from bottom to top.

[0034] Example 2

[0035] See also Figure 2 As a further optimization scheme of Example 1, in this embodiment, the FPC6 includes a substrate layer 61, a circuit layer 62 arranged on the upper surface of the substrate layer 61, and a metal heat dissipation layer 63 arranged on the lower surface of the substrate layer 61. The arrangement method can be that the circuit layer 62 and the metal heat dissipation layer 63 are respectively attached to the substrate layer 61 by double-sided adhesive. Since the thickness of the substrate layer 61 is relatively thin, the heat on the FPC6 can be diffused to the metal heat dissipation layer 63 through the substrate layer 61. The metal heat dissipation layer 63 can effectively increase the heat dissipation area of ​​the FPC6 and play a role in uniform heat dissipation, thereby improving the heat dissipation efficiency of the FPC6. The substrate layer 61 can be any one of polyimide, polyester, polysulfone or polytetrafluoroethylene, the double-sided adhesive is any one of an acrylic adhesive layer or an epoxy resin adhesive layer, and the metal heat dissipation layer 63 can be a copper foil layer.

[0036] Furthermore, the FPC 6 also includes at least one through-hole 64 penetrating the substrate layer 61, the circuit layer 62 and the metal heat dissipation layer 63, and the inner wall of the through-hole 64 is provided with a heat-conducting layer in contact with the circuit layer 62 and the metal heat dissipation layer 63. By utilizing the good thermal conductivity of the through-hole 64, the circuit layer 62 and the metal heat dissipation layer 63 on both sides of the substrate layer 61 can be electrically connected to play a good thermal conductivity function, and the thermal conductive layer can provide a thermal conductive function to achieve a good heat dissipation effect. Among them, the thermal conductive layer can be a copper glue conductive ink layer.

[0037] Furthermore, a heat conductor connected to an external heat-conducting structure is disposed in the through hole 64. The heat conductor is connected to the external heat-conducting structure from one side of the circuit layer 62 and is also in contact with the heat-conducting layer in the through hole 64, so that the circuit layer 62 and the metal heat dissipation layer 63 can be connected to the external heat-conducting structure through the through hole 64, so that the heat in the FPC 6 can be diffused to the external heat-conducting structure through the heat conductor in the through hole 64, so as to further improve the heat dissipation efficiency of the FPC 6. Preferably, in order to enable the through hole 64 to be connected to the external heat-conducting structure, the through hole 64 is disposed at the edge of the FPC 6.

[0038] Furthermore, the metal heat dissipation layer 63 is a uniform heat dissipation structure, and its structure can be any one of a mesh structure, a strip structure, a wavy structure or a honeycomb structure. Through the uniform heat dissipation structure, the heat dissipation effect can be better improved.

[0039] Example 3

[0040] See also Figure 3 As a further optimization scheme of Example 1, in this embodiment, a protrusion 21 is provided on the edge of the upper surface of the large glass 2 extending outward, and a buffer glue 22 is provided on the upper surface of the large glass 2 between the protrusion 21 and the small glass 3, and the buffer glue 22 abuts against the cover plate 5. Since the protrusion 21 is provided on the edge of the large glass 2, the protrusion 21 can limit the flow of the buffer glue 22, so that the shape of the buffer glue 22 is easy to control, and there will be no overflow of glue or incomplete glue dispensing. This prevents the LCD screen from being unable to be assembled with the casing. In addition, the problem of poor buffering effect caused by incomplete glue dispensing and easy breakage of the large glass 2 is avoided, and the LCD screen is prevented from displaying abnormally.

[0041] Furthermore, the upper surface of the protrusion 21 is flush with the upper surface of the small piece of glass 3 to further limit the flow of the buffer glue 22, so that the shape of the buffer glue 22 is easy to control without overflowing glue or incomplete glue dispensing.

[0042] Furthermore, the buffer glue 22 is silicone glue.

[0043] Furthermore, a chamfer is provided between the protrusion 21 and the large piece of glass 2, so that the buffer glue 22 can more easily fill the space between the protrusion 21 on the upper surface of the large piece of glass 2 and the small piece of glass 3. The protrusion 21 with a chamfer can make the buffer glue 22 flow more smoothly into the space between the protrusion 21 on the upper surface of the large piece of glass 2 and the small piece of glass 3, so that bubbles are less likely to appear.

[0044] Furthermore, the upper surface of the large glass 2 and the side surface of the protrusion 21 are rough surfaces to improve the fixing effect of the buffer glue 22 .

[0045] Furthermore, the rough surface is a frosted surface or a diamond knurled surface to further improve the fixing effect of the buffer glue 22 .

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A liquid crystal display screen for preventing ITO touch pattern from being corroded, characterized in that: It comprises a lower polarizer, a large piece of glass, a small piece of glass, an upper polarizer and a cover plate which are stacked in sequence from bottom to top. The large piece of glass is longer than the small piece of glass and extends outward to form a step. The upper surface of the large piece of glass located at the step is bound with a driver IC and an FPC. The upper surface of the small piece of glass is provided with an ITO touch pattern layer. The lower surface of the upper polarizer is provided with a pressure-sensitive adhesive layer. The small piece of glass and the upper polarizer are adhered and fixed by the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is an acid-free pressure-sensitive adhesive.

2. The liquid crystal display screen for preventing ITO touch pattern from being corroded according to claim 1, characterized in that: The FPC includes a substrate layer, a circuit layer disposed on an upper surface of the substrate layer, and a metal heat dissipation layer disposed on a lower surface of the substrate layer.

3. The liquid crystal display screen for preventing the ITO touch pattern from being corroded according to claim 2, characterized in that: The FPC further includes at least one through-hole penetrating the substrate layer, the circuit layer and the metal heat dissipation layer, and an inner wall of the through-hole is provided with a heat-conducting layer in contact with the circuit layer and the metal heat dissipation layer.

4. The liquid crystal display screen for preventing the ITO touch pattern from being corroded according to claim 3, characterized in that: A heat conductor connected to an external heat-conducting structure is arranged in the through hole, and the heat conductor is in contact with the heat-conducting layer.

5. The liquid crystal display screen for preventing ITO touch pattern from being corroded according to claim 2, characterized in that: The structure of the metal heat dissipation layer is a mesh structure, a strip structure, a wave structure or a honeycomb structure.

6. The liquid crystal display screen for preventing ITO touch pattern from being corroded according to claim 1, characterized in that: A protrusion is arranged on the edge of the upper surface of the large piece of glass extending outward, and a buffer glue is arranged on the upper surface of the large piece of glass between the protrusion and the small piece of glass, and the buffer glue abuts against the cover plate.

7. The liquid crystal display screen for preventing the ITO touch pattern from being corroded according to claim 6, characterized in that: The upper surface of the protrusion is flush with the upper surface of the small piece of glass.

8. The liquid crystal display screen for preventing ITO touch pattern from being corroded according to claim 6, characterized in that: The buffer glue is silicone glue.

9. The liquid crystal display screen for preventing ITO touch pattern from being corroded according to claim 6, characterized in that: A rounded corner is arranged between the protrusion and the large piece of glass.

10. The liquid crystal display screen for preventing ITO touch pattern from being corroded according to claim 6, characterized in that: The upper surface of the large piece of glass and the side surfaces of the protrusions are rough surfaces.

Images