Liquid crystal display module for improving integrated black effect

Abstract

The utility model discloses a liquid crystal display module capable of improving the integrated black effect. The liquid crystal display module is provided with a visible area and a frame area. The display screen comprises a transparent cover plate, a liquid crystal display screen and a black ink layer, the liquid crystal display screen and the black ink layer are arranged on the surface of one side of the transparent cover plate, the liquid crystal display screen corresponds to the visible area, and the black ink layer corresponds to the frame area; the liquid crystal display screen comprises an upper electrode layer, and the upper electrode layer is an anti-reflection conducting layer. According to the liquid crystal display module, the integrated black effect of the visible area and the frame area can be improved, and meanwhile the material cost is low.

Description

Technical Field

[0001] The utility model relates to a liquid crystal display technology, in particular to a liquid crystal display module with improved integrated black effect. Background Art

[0002] The LCD module includes a visible area and a frame area. The traditional frame area is printed with a black ink layer. The background color of the visible area is the color of the LCD screen, while the background color of the frame area is the color of the black ink layer. When the LCD module is in the off state, the color difference between the two causes the visual effect of the visible area and the frame area to be different, and there is a clear boundary between the two. The main reason for this phenomenon is that the LCD screen has multiple functional film layers, and the refractive indexes of different functional film layers are inconsistent, which leads to too much reflection of external light in the visible area when the screen is off, and the color of the visible area is brighter and grayer.

[0003] In order to solve the above problems, the prior art generally sets an anti-reflection film in the visible area of ​​the liquid crystal display module, and uses the anti-reflection film to reduce the reflectivity of the visible area, so that the color of the visible area becomes darker and blacker when the screen is off, and the color is as consistent as possible with the black ink layer in the border area. For example, a Chinese patent with patent number CN201920824782.9 discloses an integrated black touch display module, which includes a glass cover plate, a first optical adhesive layer, a sensor layer, a second optical adhesive layer and a display module stacked in sequence; wherein the glass cover plate includes: a glass substrate having a visible area and a frame area arranged around the visible area, the glass substrate including a first surface and a second surface arranged opposite to each other, wherein the first surface faces the sensor layer; a black ink layer, arranged on the first surface of the glass substrate and corresponding to the frame area; a coating layer, arranged on the surface of the black ink layer away from the glass substrate, and corresponding to the visible area and the frame area; wherein the coating layer is used to adjust the reflectivity of the visible area so that the reflectivity of the frame area is the same as that of the visible area; the coating layer is an anti-reflection film.

[0004] However, adding an extra coating layer will undoubtedly increase the material cost of the product. Utility Model Content

[0005] In order to solve the above-mentioned deficiencies of the prior art, the utility model provides a liquid crystal display module, which can improve the integrated black effect of the visible area and the frame area, and at the same time has a low material cost.

[0006] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0007] A liquid crystal display module with improved integrated black effect has a visible area and a frame area; it includes a transparent cover plate, a liquid crystal display screen and a black ink layer, the liquid crystal display screen and the black ink layer are arranged on one side surface of the transparent cover plate, the liquid crystal display screen corresponds to the visible area, and the black ink layer corresponds to the frame area; the liquid crystal display screen includes an upper electrode layer, and the upper electrode layer is an anti-reflection conductive layer.

[0008] Furthermore, the upper electrode layer includes a plurality of high-refractive-index conductive films and a plurality of low-refractive-index conductive films alternately stacked.

[0009] Furthermore, the refractive index of the high refractive index conductive film is between 1.6 and 2.2.

[0010] Furthermore, the high refractive index conductive film is an ITO film.

[0011] Furthermore, the refractive index of the low-refractive-index conductive film is not higher than 1.7.

[0012] Furthermore, the low refractive index conductive film is an AZO film or a ZnO film.

[0013] Furthermore, the total number of film layers of the high refractive index conductive film and the low refractive index conductive film is 4 or 5.

[0014] Furthermore, the thickness of each layer of high refractive index conductive film and each layer of low refractive index conductive film is between 24-36 nm.

[0015] Furthermore, the thickness of the upper electrode layer is between 108-162 nm.

[0016] Furthermore, the liquid crystal display module also includes a touch function layer, and the touch function layer is arranged between the transparent cover plate and the liquid crystal display screen.

[0017] The utility model has the following beneficial effects: the utility model adopts the anti-reflection conductive layer as the upper electrode layer of the liquid crystal display screen. In addition to the display function, the upper electrode layer also has an anti-reflection function, which can reduce the reflectivity of the liquid crystal display screen, so that the reflectivity of the visible area and the frame area of ​​the liquid crystal display module are the same or close, and then when the liquid crystal display screen is in the screen-off state, the liquid crystal display screen reflects less external light, so that the visible area of ​​the liquid crystal display module presents a darker and darker background color, so as to eliminate the boundary between the visible area and the frame area of ​​the liquid crystal display module when the screen is off, and achieve an integrated black effect; and the liquid crystal display module does not require a separate anti-reflection layer, and the material cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the stacking structure of the liquid crystal display module provided by the utility model.

[0019] Figure 2 This is a schematic diagram of the stacking structure of the liquid crystal display screen in the liquid crystal display module provided by the utility model.

[0020] Figure 3 This is a schematic diagram of the stacking structure of the upper electrode layer in the liquid crystal display module provided by the utility model.

[0021] Figure 4 This is a schematic diagram of the stacking structure of another liquid crystal display module provided by the utility model.

[0022] Figure 5 This is a schematic diagram of the stacking structure of another liquid crystal display module provided by the utility model. Implementation

[0023] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, 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 having 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 limiting the present invention.

[0024] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] 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 technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0027] like Figure 1 As shown, a liquid crystal display module with improved integrated black effect has a visible area and a frame area; the liquid crystal display module includes a transparent cover plate 100, a liquid crystal display screen 200 and a black ink layer 300, the liquid crystal display screen 200 and the black ink layer 300 are arranged on one side surface of the transparent cover plate 100, the liquid crystal display screen 200 corresponds to the visible area, and the black ink layer 300 corresponds to the frame area.

[0028] The black ink layer 300 can be, but is not limited to, directly made on the surface of the border area of ​​the transparent cover plate 100 by screen printing. The LCD screen 200 can be, but is not limited to, fixed to the visible area of ​​the transparent cover plate 100 and the surface of the black ink layer 300 by transparent optical adhesive 400. The LCD screen 200 includes a display area and a wiring area. The display area of ​​the LCD screen 200 is exposed from the transparent cover plate 100, and the wiring area of ​​the LCD screen 200 is blocked by the black ink layer 300.

[0029] like Figure 2 As shown, the liquid crystal display screen 200 includes an upper substrate 220, a lower substrate 260 and a liquid crystal layer 280, the upper substrate 220 and the lower substrate 260 are relatively fitted and fixed by a sealant 240, the sealant 240 is located in the wiring area and surrounds the outside of the display area; the liquid crystal layer 280 is arranged in a sealed space enclosed by the upper substrate 220, the lower substrate 260 and the sealant 240; the liquid crystal display screen 200 also includes an upper electrode layer 230, a lower electrode layer 250, an upper polarizer 210 and a lower polarizer 270, the upper electrode is arranged on a side surface of the upper substrate 220 facing the lower substrate 260, the upper polarizer 210 is arranged on a side surface of the upper substrate 220 facing away from the lower substrate 260, the lower electrode layer 250 is arranged on a side surface of the lower substrate 260 facing the upper substrate 220, and the lower polarizer 270 is arranged on a side surface of the lower substrate 260 facing away from the upper substrate 220.

[0030] The upper electrode layer 230 is an anti-reflection conductive layer.

[0031] The utility model adopts the anti-reflection conductive layer as the upper electrode layer 230 of the liquid crystal display screen 200. In addition to the display function, the upper electrode layer 230 also has an anti-reflection function, which can reduce the reflectivity of the liquid crystal display screen 200, so that the reflectivity of the visible area and the frame area of ​​the liquid crystal display module are the same or close. Furthermore, when the liquid crystal display screen 200 is in the screen-off state, the liquid crystal display screen 200 reflects less external light, so that the visible area of ​​the liquid crystal display module presents a darker and darker background color, so as to eliminate the boundary between the visible area and the frame area of ​​the liquid crystal display module when the screen is off, and achieve an integrated black effect; moreover, the liquid crystal display module does not require a separate anti-reflection layer, and the material cost is relatively low.

[0032] like Figure 3 As shown, the upper electrode layer 230 includes a plurality of high refractive index conductive films 231 and a plurality of low refractive index conductive films 232 which are alternately stacked.

[0033] The upper electrode layer 230 is formed by alternatingly stacking a plurality of high refractive index conductive films 231 and a plurality of low refractive index conductive films 232 based on the principle of optical interference. The incident light of the external environment is reflected at the interface between the adjacent high refractive index conductive films 231 and the low refractive index conductive films 232. There is an optical path difference between each beam of reflected light. The optical path difference between the reflected light beams is related to the film thickness of each high refractive index conductive film 231 and each low refractive index conductive film 232. By reasonably designing the film thickness of each high refractive index conductive film 231 and each low refractive index conductive film 232, the optical interference requirements are met between each beam of reflected light and coherently cancel each other out, thereby ultimately achieving the purpose of reducing the reflectivity.

[0034] In this embodiment, the high refractive index conductive film 231 and the low refractive index conductive film 232 can be formed by, but not limited to, a magnetron sputtering process.

[0035] Preferably, the refractive index of the high refractive index conductive film 231 is between 1.6 and 2.2, and the high refractive index conductive film 231 may be, but is not limited to, an ITO film (indium tin oxide film).

[0036] The refractive index of the ITO film mainly depends on the ratio of In2O and Sn2O3 in its film-forming materials, and is also affected by its film thickness and the process parameters during film formation. Therefore, the refractive index of the ITO film in the visible light band can be adjusted to between 1.6 and 2.2 by controlling the ratio of the film-forming materials, the film thickness and the process parameters during film formation.

[0037] Preferably, the refractive index of the low-refractive-index conductive film 232 is not higher than 1.7, and the low-refractive-index conductive film 232 may be, but is not limited to, an AZO film (aluminum-doped zinc oxide film) or a ZnO film (zinc oxide film).

[0038] The refractive index of ZnO film in the visible light band is about 1.5, which varies due to its crystal structure and preparation conditions, but the floating range of the refractive index is not very large. The refractive index of ZnO film can be further reduced by doping Al elements to form an AZO film with higher transmittance and better conductivity.

[0039] In order to ensure the display function of the upper electrode layer 230, the thickness of the upper electrode layer 230 needs to be controlled between 108-162 nm, and the resistance of the upper electrode layer 230 needs to be controlled between 14-16Ω.

[0040] Preferably, the total number of film layers of the high refractive index conductive film 231 and the low refractive index conductive film 232 is 4 or 5, and the thickness of each layer of the high refractive index conductive film 231 and each layer of the low refractive index conductive film 232 is respectively between 24-36 nm.

[0041] When the upper electrode layer 230 adopts 4 film layers, the number of film layers of the high refractive index conductive film 231 is 2 layers, and the number of film layers of the low refractive index conductive film 232 is also 2 layers; when the upper electrode layer 230 adopts 5 film layers, the number of film layers of the high refractive index conductive film 231 is 3 layers, and the number of film layers of the low refractive index conductive film 232 is 2 layers, or the number of film layers of the high refractive index conductive film 231 is 2 layers, and the number of film layers of the low refractive index conductive film 232 is 3 layers.

[0042] Of course, the total number of film layers of the high refractive index conductive film 231 and the low refractive index conductive film 232 in the upper electrode layer 230 should be based on actual product requirements and should not be limited to the description in this embodiment. Embodiment 2

[0043] As an optimization solution of the first embodiment, in this embodiment, if Figure 4 and 5 As shown, the liquid crystal display module further includes a touch function layer 500 , and the touch function layer 500 is disposed between the transparent cover plate 100 and the liquid crystal display screen 200 .

[0044] When the touch function layer 500 adopts an OGS structure, Figure 4As shown, the touch sensor of the touch function layer 500 is directly made on the surface of the transparent cover plate 100 facing the liquid crystal display screen 200, and the black ink layer 300 is first made, and then the touch function layer 500 is made, and finally the liquid crystal display screen 200 is bonded and fixed on the surface of the touch function layer 500 facing away from the transparent cover plate 100 by transparent optical adhesive 400.

[0045] When the touch function layer 500 adopts a GG, GF or FF structure, Figure 5 As shown, the touch sensor of the touch function layer 500 is firstly made on a glass substrate or a film substrate, and then bonded and fixed on the surface of the transparent cover plate 100 facing the liquid crystal display 200 by a first transparent optical adhesive 410, and finally the liquid crystal display 200 is bonded and fixed on the surface of the touch function layer 500 facing away from the transparent cover plate 100 by a second transparent optical adhesive 420.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the utility model rather than to limit them. Although the embodiments of the utility model are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the utility model can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A liquid crystal display module for improving the integrated black effect, having a visible area and a frame area; comprising a transparent cover, a liquid crystal display screen and a black ink layer, wherein the liquid crystal display screen and the black ink layer are arranged on one side surface of the transparent cover, the liquid crystal display screen corresponds to the visible area, and the black ink layer corresponds to the frame area; characterized in that: The liquid crystal display screen comprises an upper electrode layer, and the upper electrode layer is an anti-reflection conductive layer.

2. The liquid crystal display module according to claim 1, characterized in that: The upper electrode layer includes a plurality of high-refractive-index conductive films and a plurality of low-refractive-index conductive films which are alternately stacked.

3. The liquid crystal display module according to claim 2, characterized in that: The refractive index of the high refractive index conductive film is between 1.6 and 2.

2.

4. The liquid crystal display module according to claim 2 or 3, characterized in that: The high refractive index conductive film is an ITO film.

5. The liquid crystal display module according to claim 2, characterized in that: The refractive index of the low-refractive-index conductive film is not higher than 1.

7.

6. The liquid crystal display module according to claim 2 or 5, characterized in that: The low refractive index conductive film is an AZO film or a ZnO film.

7. The liquid crystal display module according to claim 2, characterized in that: The total number of film layers of the high-refractive-index conductive film and the low-refractive-index conductive film is 4 or 5.

8. The liquid crystal display module according to claim 2, characterized in that: The thickness of each layer of high refractive index conductive film and each layer of low refractive index conductive film is between 24-36nm respectively.

9. The liquid crystal display module according to claim 1, characterized in that: The thickness of the upper electrode layer is between 108-162 nm.

10. The liquid crystal display module according to claim 1, characterized in that: The liquid crystal display module further includes a touch function layer, and the touch function layer is arranged between the transparent cover plate and the liquid crystal display screen.

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