Liquid crystal display and manufacturing method thereof

Abstract

The invention provides a liquid crystal display and a manufacturing method thereof, and relates to the technical field of electromagnetic shielding, the liquid crystal display comprises a liquid crystal screen, and an electromagnetic shielding layer is evaporated on a color filter CF glass surface of the liquid crystal screen; the functional glass assembly and the liquid crystal screen are arranged in a stacked mode; the conductive connecting device comprises conductive sponge attached to the edge area of the electromagnetic shielding layer and conductive silver paste coated between the edge area of the electromagnetic shielding layer and the conductive sponge; the machine shell is attached to the side edge of the functional glass assembly, and conductive sponge is arranged between the machine shell and the functional glass assembly. According to the embodiment of the invention, electromagnetic conduction can be realized through the above structure, the conductive sponge can effectively shield external electromagnetic interference, and after the silver paste is cured, the edge bonding force and the structural supporting strength of the functional glass assembly can be enhanced, and the structural firmness is relatively good.

Description

Technical Field

[0001] This application relates to the field of electromagnetic shielding technology, and particularly to a liquid crystal display and a manufacturing method thereof. Background Art

[0002] Thin Film Transistor-Liquid Crystal Display (TFT-LCD) has the characteristics of highly integrated information, high-density centralized display, and status indication, etc., thus showing broad application prospects in fields such as ships, ground control cabins, and aircraft. However, in complex electromagnetic systems and electromagnetic interference environments in fields such as defense and aviation, the electromagnetic shielding function becomes the key to the development of displays.

[0003] In related technologies, electromagnetic shielding is achieved by adding a shielding glass or a shielding film, but this method is prone to poor production in the bonding of the shielding glass or the shielding film, thereby affecting the overall performance of the display. Summary of the Invention

[0004] Embodiments of this application provide a liquid crystal display and a manufacturing method thereof to solve the problem of poor production in the bonding of the shielding glass or the shielding film.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a liquid crystal display, including:

[0007] A liquid crystal screen, on the color filter (CF) glass surface of which an electromagnetic shielding layer is vapor-deposited;

[0008] A functional glass component, which is stacked with the liquid crystal screen;

[0009] A conductive connection device, including a conductive sponge attached to the edge area of the electromagnetic shielding layer and conductive silver paste coated between the edge area of the electromagnetic shielding layer and the conductive sponge;

[0010] A housing, which is attached to the side edge of the functional glass component, and a conductive sponge is provided between the housing and the functional glass component.

[0011] Optionally, the side edges around the functional glass component are processed with copper foil edging, and a conductive sponge is provided between the edging area of the functional glass component and the housing.

[0012] Optionally, the electromagnetic shielding layer is an indium tin oxide (ITO) layer or a metal film layer.

[0013] Optionally, the thickness of the ITO layer or the metal film layer is 300 nanometers.

[0014] Optionally, the functional glass component includes at least one of a heating glass, a touch sensor, and a cover glass;

[0015] Wherein, the cover glass is a cover glass having at least one of an anti-reflection property, an anti-glare property, and an anti-fingerprint property.

[0016] Optionally, the edge region of the electromagnetic shielding layer is the edge region around the CF glass.

[0017] Optionally, the silver content of the conductive silver paste is between 60% and 70%.

[0018] Optionally, the liquid crystal display screen includes an upper polarizer, the upper polarizer is stacked with the CF glass, and the electromagnetic shielding layer is located between the upper polarizer and the CF glass.

[0019] Optionally, the size of the liquid crystal display satisfies at least one of the following conditions:

[0020] The distance between the edge of the upper polarizer of the liquid crystal display screen and the edge of the display area is greater than or equal to a first preset value;

[0021] The distance between the edge of the upper polarizer of the liquid crystal display and the edge of the CF glass is greater than or equal to a second preset value.

[0022] In a second aspect, an embodiment of the present application provides a method for manufacturing a liquid crystal display, which is applied to the liquid crystal display as described in the first aspect. The method includes:

[0023] Evaporating an electromagnetic shielding layer on the CF glass surface of the liquid crystal display;

[0024] Coating and curing a conductive silver paste on the edge region of the electromagnetic shielding layer;

[0025] Connecting the functional glass component to the electromagnetic shielding layer after wrapping the edge with a copper foil, and arranging a conductive sponge between the copper foil edge region and the conductive silver paste;

[0026] Attaching the housing to the copper foil edge region, and arranging a conductive sponge between the housing and the copper foil edge region.

[0027] In the embodiment of the present application, by evaporating an electromagnetic shielding layer on the liquid crystal display, the edge region of the electromagnetic shielding layer is in conduction with the functional glass component through the conductive sponge, and the conductive sponge is attached to the periphery of the functional glass component to connect the chassis to form a grounding loop, thereby realizing electromagnetic conduction. The conductive sponge can effectively shield external electromagnetic interference, and after the silver paste is cured, it can enhance the bonding force and structural support strength of the edge of the functional glass component, and the structural firmness is better. Description of the Drawings

[0028] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 is a cross-sectional view of a liquid crystal display provided by an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the planar dimensions of a liquid crystal display provided by an embodiment of the present application;

[0031] Figure 3 is a schematic diagram of electromagnetic conduction of a liquid crystal display provided by an embodiment of the present application;

[0032] Figure 4 is a flowchart of a manufacturing method of a liquid crystal display provided by an embodiment of the present application;

[0033] Figure 5 is one of the process flowcharts of a manufacturing process of a liquid crystal display provided by an embodiment of the present application;

[0034] Figure 6 is the second of the process flowcharts of a manufacturing process of a liquid crystal display provided by an embodiment of the present application. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0036] The electromagnetic shielding function, that is, shielding components such as display control, display driving, and display power supply in the same equipotential body, using a conductor to absorb the electromagnetic field energy, and the skin effect makes the propagation of the electromagnetic field attenuate. The traditional electromagnetic shielding method, that is, through a metal shell or using wire mesh glass, conductive glass, and EMI film materials, realizes continuous conduction and low impedance in the display area, which affects the display effect.

[0037] In the present application, an electromagnetic shielding method of integrating a shielding layer into a liquid crystal panel is adopted, which can reduce the problem of poor bonding of glass or film materials and optimize the user experience at the same time. In this method, the display structure of the series electromagnetic shielding path becomes the key, and a conductive sponge is used in combination with silver paste to conduct the functional glass component and the chassis, thinning the display while achieving the electromagnetic shielding effect.

[0038] An embodiment of the present application provides a liquid crystal display to solve the problem of poor production in the bonding of a shielding glass or a shielding film.

[0039] See Figure 1 , Figure 1 FIG. is a structural diagram of a liquid crystal display provided by an embodiment of the present application. As Figure 1 shown, the liquid crystal display includes:

[0040] A liquid crystal screen 1, on which an electromagnetic shielding layer 102 is vapor-deposited on the color filter (CF) glass surface 101 of the liquid crystal screen.

[0041] A functional glass component 2, which is stacked with the liquid crystal screen 1.

[0042] A conductive connection device 3, which includes a conductive sponge 31 attached to the edge region of the electromagnetic shielding layer 102 and a conductive silver paste 32 coated between the edge region of the electromagnetic shielding layer 102 and the conductive sponge 31.

[0043] A housing 4, which is attached to the side edge of the functional glass component 2, and a conductive sponge 31 is provided between the housing 4 and the functional glass component 2.

[0044] As Figure 1 shown, the liquid crystal screen 1 can be an indium tin oxide (ITO) liquid crystal screen, and an electromagnetic shielding layer of about 300 nm is vapor-deposited on the color filter (CF) glass surface of the ITO liquid crystal screen. In actual operation, there may be a certain error in the thickness. For example, an electromagnetic shielding effect can also be achieved when a shielding layer with a thickness of 298 nm or 303 nm is vapor-deposited.

[0045] Among them, the electromagnetic shielding layer 102 can be an ITO transparent electrode or a metal material, such as Al, Cu, Ag, Au, etc., and the electromagnetic shielding function is integrated through the electromagnetic shielding layer.

[0046] The functional glass component 2 is stacked above the liquid crystal screen 1. The functional glass component 2 can select a glass component with corresponding functions according to actual needs, such as a heating glass, a touch-functional glass, an anti-fingerprint, an anti-reflection, an anti-glare, or any one or more of such functions.

[0047] The conductive connection device may include a conductive sponge 31 and a conductive silver paste 32. Among them, the conductive sponge 31 is attached between the exposed area (i.e., the edge area not covered by the upper polarizer 5) of the electromagnetic shielding layer 102 of the ITO liquid crystal screen 1 and the functional glass component 2, and between the front frame of the housing 4 and the functional glass component 2. The compression amount of the conductive sponge 31 is increased by 30% compared with that of the conductive foam, which can reduce the Z-direction (vertical) stress.

[0048] The conductive silver paste 32 is coated between the exposed area of the electromagnetic shielding layer 102 of the ITO liquid crystal screen 1 and the conductive sponge 31. The lap joint and tunneling effect formed by the dense packing of silver particles strengthen the ability of electrons to transmit current in the shielding layer and the conductive sponge 31. After curing, it has high strength and bonding force, and can improve the structural firmness of the liquid crystal display.

[0049] As Figure 1 shown, the liquid crystal display further includes a module middle frame 6, which is located between the front frame 4 of the casing and the functional glass component 2. The functional glass component 2 and the upper polarizer 5 are bonded together by an optical adhesive 7.

[0050] The liquid crystal display further includes an optical film material 8, a whole machine rear shell 9, a TFT glass 10, a silica gel gasket 11, a lower polarizer 12, a light guide plate 13, and a module backplane 14, and their positional relationships are as shown in the figure.

[0051] Optionally, as Figure 1 shown, the side edges around the functional glass component 2 are processed with copper foil edging, and a conductive sponge 31 is provided between the edging area of the functional glass component 2 and the casing 4.

[0052] The side edges around the functional glass component 2 are edged with copper foil, and a conductive sponge 31 is provided between the copper foil edging area of the functional glass component 2 and the fitting area of the casing 4. The conductive sponge can effectively shield external electromagnetic interference, enhance the conductivity and flame retardancy, and buffer the fitting pressure of the functional glass component, thinning the display.

[0053] Optionally, the electromagnetic shielding layer 102 is an indium tin oxide ITO layer or a metal film layer.

[0054] The metal film layer is, for example, any one metal or a combined metal among Al, Cu, Ag, and Au.

[0055] Optionally, the thickness of the ITO layer or the metal film layer is 300 nanometers. During actual operation, there may be a certain error, and the thickness of the electromagnetic shielding layer 102 is within a preset thickness range centered on 300 nanometers. For example, 299 nm, 302 nm.

[0056] Optionally, the functional glass component 2 includes at least one of a heating glass, a touch glass, and a cover glass;

[0057] Among them, the cover glass is a cover glass with at least one of the properties of anti-reflection performance, anti-glare performance, and anti-fingerprint performance.

[0058] Among them, the heating glass can achieve the heating function, and the touch glass (including the touch sensor) can achieve the touch function.

[0059] Cover glass is a type of glass with one or more functions such as anti-reflective (AR), anti-glare (AG), and anti-fingerprint (AF).

[0060] The liquid crystal display can select one or more of these glasses as the functional glass component according to specific functional requirements.

[0061] Optionally, the edge region of the electromagnetic shielding layer 102 is a region corresponding to the edge region around the CF glass 101.

[0062] The edge region around the CF glass 101 is as shown by the shaded region at the edge in Figure 2 In this region, a conductive sponge 31 is provided, and a conductive silver paste 32 is provided between the conductive sponge 31 and the electromagnetic shielding.

[0063] Optionally, the silver content of the conductive silver paste 32 is between 60% and 70%.

[0064] The conductive silver paste 32 with a silver content of 60% - 70% is selected and coated on the contact area between the electromagnetic shielding layer 102 and the conductive sponge 31 to enhance the electromagnetic conductivity of the conductive sponge 31. After the silver paste is cured, it further enhances the edge bonding adhesion and structural support strength of the functional glass component 2.

[0065] Optionally, as shown in Figure 1 The liquid crystal screen 1 includes an upper polarizer 5. The upper polarizer is stacked with the CF glass 101, and the electromagnetic shielding layer 102 is located between the upper polarizer and the CF glass 101.

[0066] Optionally, as shown in Figure 2 The size of the liquid crystal display satisfies at least one of the following conditions:

[0067] The distance between the edge of the upper polarizer 5 of the liquid crystal display and the edge of the display area is greater than or equal to a first preset value;

[0068] The distance between the edge of the upper polarizer 5 of the liquid crystal display and the edge of the CF glass 101 is greater than or equal to a second preset value.

[0069] The entire surface of the CF glass 101 is coated with the electromagnetic shielding layer 102. The size of the upper polarizer 5 is smaller than that of the CF glass 101, and the edge region of the CF glass 101 (shown by the shaded region in Figure 2 ) is not blocked by the upper polarizer 5 and is exposed.

[0070] The distance between the edge region of the upper polarizer 5 (Polarizer, POL) and the edge of the display area (Active Area, AA) is as shown inFigure 2 The dimension Y shown in Figure 2 is greater than or equal to a first preset value to ensure the picture quality from different perspectives.

[0071] The distance between the edge region of the upper polarizer 5 and the edge of the CF glass 101 is greater than or equal to a second preset value, so that the conductive sponge 31 has a sufficient electromagnetic contact area with the CF to be conducted, and the conduction region is as shown in Figure 3 . Figure 3 as shown.

[0072] In some embodiments, the distance between the upper POL and the AA region, that is, Y≥2mm (i.e., the first preset value);

[0073] The distance between the upper POL and the edge of the ITO liquid crystal screen 1, that is, X≥3mm (i.e., the second preset value).

[0074] The above dimensions are only examples. In actual applications, X and Y can also be other dimensions. For example, Y is 2.1mm and X is 3.1mm. Adjust the dimensions of the POL, AA region, and the edge of the ITO liquid crystal screen to construct an electromagnetic conduction structure.

[0075] The electromagnetic shielding layer 102 restricts the size of the polarizer attached to the shielding layer. The plating region on the surface of the CF glass 101 is attached to the conductive sponge 31 to conduct with the functional glass component 2. The conductive sponge 31 is attached around the functional glass component 2 to connect to the chassis 4 to form a grounding loop, realizing electromagnetic conduction, as shown in Figure 3 . Adding a conductive sponge can effectively shield external electromagnetic interference, improve the conductivity and flame retardancy, and buffer the fitting pressure of the functional glass component, thinning the display. Figure 3 as shown. Adding a conductive sponge can effectively shield external electromagnetic interference, improve the conductivity and flame retardancy, and buffer the fitting pressure of the functional glass component, thinning the display.

[0076] See Figure 4 , Figure 4 is a manufacturing method of a liquid crystal display provided by an embodiment of the present application, applied to the liquid crystal display described in any of the above embodiments. The method includes:

[0077] Step 401, evaporating an electromagnetic shielding layer on the CF glass surface of the liquid crystal display;

[0078] Step 402, coating conductive silver paste on the edge region of the electromagnetic shielding layer;

[0079] Step 403, after the functional glass component is wrapped with copper foil, set a conductive sponge between the copper foil wrapping region and the conductive silver paste, and connect the functional glass component to the electromagnetic shielding layer;

[0080] Step 404, attach the outer shell to the copper foil wrapping region, and set a conductive sponge between the outer shell and the copper foil wrapping region.

[0081] In the related art, the electromagnetic shielding function is achieved by adding a shielding film and a shielding glass, and the process flow is as shown inFigure 5 as shown

[0082] For the present application, when an electromagnetic shielding layer is vapor-deposited on CF glass, the manufacturing process flow can be referred to Figure 6 as shown

[0083] First, an ITO or metal film layer is vapor-deposited on the surface of the 1CF of the liquid crystal screen. A polarizer is covered on the shielding layer, and a conduction area is reserved to fit a conductive sponge and apply silver paste. Then, the functional glass component is edge-wrapped with copper foil. Subsequently, a backlight is installed. Finally, the housing is assembled and the functional glass component is connected to the housing using a conductive sponge to achieve electromagnetic shielding, heating, and touch functions.

[0084] Through the above process, the ability of economical assembly can be achieved, the overall product thickness of the liquid crystal display can be reduced, while avoiding manufacturing defects in lamination, optimizing the bill of materials (BOM), and reducing costs.

[0085] In the embodiment of the present application, by vapor-depositing an electromagnetic shielding layer on the CF glass of the liquid crystal display, while the liquid crystal display has an electromagnetic shielding function, the product becomes thinner and lighter, and at the same time, the display effect is enhanced; due to the cancellation of the external hanging shielding method, the BOM cost is reduced; during the manufacturing process, the water glue lamination is reduced, and the manufacturing defects are reduced; the reliability problems such as vibration, high and low temperature are reduced, and the stability and reliability are increased.

[0086] It should be noted that in this article, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element.

[0087] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of the present application.

[0088] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A liquid crystal display, characterized in that: include: Liquid crystal screen, wherein the color filter CF glass surface of the liquid crystal screen is evaporated with an electromagnetic shielding layer; A functional glass component, stacked with the liquid crystal screen; A conductive connection device, comprising a conductive sponge attached to the edge region of the electromagnetic shielding layer and a conductive silver paste applied between the edge region of the electromagnetic shielding layer and the conductive sponge; The housing is fitted with the side edge of the functional glass component, and a conductive sponge is provided between the housing and the functional glass component.

2. The liquid crystal display according to claim 1, characterized in that: The side edges around the functional glass component are wrapped with copper foil, and a conductive sponge is arranged between the wrapped area of ​​the functional glass component and the housing.

3. The liquid crystal display according to claim 1, characterized in that: The electromagnetic shielding layer is an indium tin oxide (ITO) layer or a metal film layer.

4. The liquid crystal display according to claim 3, characterized in that: The thickness of the ITO layer or the metal film layer is within a preset thickness range centered at 300 nanometers.

5. The liquid crystal display according to claim 1, characterized in that: The functional glass assembly includes at least one of heating glass, touch glass and cover glass; Wherein, the cover glass is a cover glass having at least one of anti-reflection performance, anti-glare performance, and anti-fingerprint performance.

6. The liquid crystal display according to claim 1, characterized in that: The edge region of the electromagnetic shielding layer is a region corresponding to the edge region around the CF glass.

7. The liquid crystal display according to claim 1, characterized in that: The silver content of the conductive silver paste is between 60% and 70%.

8. The liquid crystal display according to claim 1, characterized in that: The liquid crystal screen comprises an upper polarizer, which is stacked with the CF glass, and the electromagnetic shielding layer is located between the upper polarizer and the CF glass.

9. The liquid crystal display according to any one of claims 1 to 8, characterized in that: The size of the liquid crystal display satisfies at least one of the following conditions: The distance between the edge of the upper polarizer of the liquid crystal display and the edge of the display area is greater than or equal to a first preset value; The distance between the edge of the upper polarizer of the liquid crystal display and the edge of the CF glass is greater than or equal to a second preset value.

10. A method for manufacturing a liquid crystal display, characterized in that: Applied to a liquid crystal display according to any one of claims 1 to 9, the method comprising: Evaporating an electromagnetic shielding layer on the CF glass surface of the LCD; Applying conductive silver paste on the edge area of ​​the electromagnetic shielding layer and curing it; After the functional glass component is edged with copper foil, a conductive sponge is arranged between the copper foil edged area and the conductive silver paste, and the functional glass component is connected to the electromagnetic shielding layer; The outer shell is attached to the copper foil edge-wrapped area, and a conductive sponge is arranged between the outer shell and the copper foil edge-wrapped area.

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