Liquid crystal display and manufacturing method thereof

Abstract

The application provides a liquid crystal display and a manufacturing method thereof, and relates to the technical field of electromagnetic shielding, wherein the liquid crystal display comprises a liquid crystal screen, a color filter (CF) glass surface of the liquid crystal screen is coated with an electromagnetic shielding layer, a functional glass assembly is arranged in a laminated mode with the liquid crystal screen, a conductive connecting device comprises a conductive sponge attached to an edge area of the electromagnetic shielding layer and a conductive silver paste coated between the edge area of the electromagnetic shielding layer and the conductive sponge, and a casing is attached to a side edge of the functional glass assembly, and a conductive sponge is arranged between the casing and the functional glass assembly. According to the above structure, electromagnetic conduction can be realized, the conductive sponge can effectively shield external electromagnetic interference, the silver paste can enhance the edge bonding force and the structural support strength of the functional glass assembly after solidification, and the structure is firm.

Description

Technical Field

[0001] This application relates to the field of electromagnetic shielding technology, and in particular to a liquid crystal display and its manufacturing method. Background Technology

[0002] Thin-film transistor liquid crystal displays (TFT-LCDs) possess characteristics such as high information integration, high-density centralized display, and status indication, thus showing broad application prospects in fields such as ships, ground control cabins, and aircraft. However, in the complex electromagnetic systems and electromagnetic interference environments of defense, aviation, and other fields, electromagnetic shielding functionality has become a key aspect of display development.

[0003] Electromagnetic shielding is achieved by adding shielding glass or shielding film in related technologies. However, this method is prone to poor manufacturing of the shielding glass or shielding film, which in turn affects the overall performance of the display. Summary of the Invention

[0004] This application provides a liquid crystal display and a method for manufacturing the same, to solve the problem of poor manufacturing when bonding shielding glass or shielding film.

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

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

[0007] The LCD screen has an electromagnetic shielding layer deposited on the CF glass surface of the color filter.

[0008] A functional glass assembly is stacked on top of the LCD screen;

[0009] A conductive connection device includes 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.

[0010] The housing is fitted to the side edge of the functional glass assembly, and a conductive sponge is provided between the housing and the functional glass assembly.

[0011] Optionally, the side edges of the functional glass assembly are wrapped with copper foil, and conductive sponge is provided between the wrapped area of ​​the functional glass assembly 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 metal film layer is 300 nanometers.

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

[0015] The cover glass is a cover glass with at least one of the following properties: anti-reflective properties, anti-glare properties, and anti-fingerprint properties.

[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 screen includes 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.

[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] Secondly, embodiments of this application provide a method for manufacturing a liquid crystal display, applied to the liquid crystal display as described in the first aspect, the method comprising:

[0023] An electromagnetic shielding layer is vapor-deposited onto the CF glass surface of the liquid crystal display.

[0024] A conductive silver paste is applied to the edge region of the electromagnetic shielding layer and then cured.

[0025] The functional glass assembly is connected to the electromagnetic shielding layer after being edged with copper foil, and a conductive sponge is placed between the copper foil edged area and the conductive silver paste.

[0026] The outer shell is attached to the copper foil edging area, and a conductive sponge is placed between the outer shell and the copper foil edging area.

[0027] In this embodiment, an electromagnetic shielding layer is deposited on the liquid crystal display. Conductive sponge is bonded to the edge region of the electromagnetic shielding layer, creating a conductive connection with the functional glass assembly. Conductive sponge is bonded around the perimeter of the functional glass assembly, connecting it to the housing to form a grounding loop, thus achieving electromagnetic conductivity. The conductive sponge effectively shields against external electromagnetic interference. After the silver paste cures, it enhances the adhesion and structural support strength of the functional glass assembly's edges, resulting in a robust structure. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a cross-sectional view of a liquid crystal display provided in an embodiment of this application;

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

[0031] Figure 3 This is a schematic diagram of electromagnetic conduction of a liquid crystal display provided in an embodiment of this application;

[0032] Figure 4 This is a flowchart illustrating a method for manufacturing a liquid crystal display according to an embodiment of this application;

[0033] Figure 5 This is one of the manufacturing process flow diagrams of a liquid crystal display provided in the embodiments of this application;

[0034] Figure 6 This is the second process flow diagram of a liquid crystal display manufacturing process provided in the embodiments of this application. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] Electromagnetic shielding involves enclosing display control, display drive, and display power supply components within the same equipotential body. This utilizes conductors to absorb electromagnetic field energy, and the skin effect attenuates electromagnetic field propagation. Traditional electromagnetic shielding methods, such as using metal casings or materials like screened glass, conductive glass, or EMI films, achieve continuous conductivity and low impedance in the display area, but this can negatively impact display quality.

[0037] In this application, an electromagnetic shielding method integrating a shielding layer into the liquid crystal panel is employed, which can reduce problems related to poor adhesion of glass or film materials while optimizing the user experience. In this method, the display structure with series electromagnetic shielding pathways becomes crucial, and conductive sponge combined with silver paste to conduct functional glass components and the casing achieves electromagnetic shielding effectiveness while reducing the display's thickness.

[0038] This application provides a liquid crystal display to solve the problem of poor manufacturing of shielding glass or shielding film.

[0039] See Figure 1 , Figure 1 This is a structural diagram of a liquid crystal display provided in an embodiment of this application, such as... Figure 1 As shown, the liquid crystal display includes:

[0040] LCD screen 1, wherein an electromagnetic shielding layer 102 is deposited on the surface of the color filter CF glass 101 of the LCD screen;

[0041] Functional glass assembly 2 is stacked on top of the LCD screen 1;

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

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

[0044] like Figure 1 As shown, the LCD screen 1 can be an indium tin oxide (ITO) LCD screen, with an electromagnetic shielding layer of approximately 300 nm deposited on the color filter (CF) glass surface of the ITO LCD screen. In actual operation, the thickness may have some errors; for example, depositing a shielding layer with a thickness of 298 nm or 303 nm can also achieve the electromagnetic shielding effect.

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

[0046] The functional glass component 2 is stacked on top of the LCD screen 1. The functional glass component 2 can be selected according to actual needs, such as heated glass, touch-sensitive glass, anti-fingerprint, anti-reflective, anti-glare, or any one or more of these functions.

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

[0048] Conductive silver paste 32 is applied between the exposed area of ​​the electromagnetic shielding layer 102 of the ITO LCD screen 1 and the conductive sponge 31. The overlapping and tunneling effect formed by the dense accumulation of silver particles enhances 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, which can improve the structural robustness of the LCD.

[0049] like Figure 1 As shown, the LCD also includes a module frame 6, located between the front frame 4 of the housing and the functional glass assembly 2. The functional glass assembly 2 and the upper polarizer 5 are bonded together with optical adhesive 7.

[0050] The liquid crystal display also includes an optical film 8, a back cover 9, a TFT glass 10, a silicone pad 11, a lower polarizer 12, a light guide plate 13, and a module back plate 14, the positional relationship of which is shown in the figure.

[0051] Optionally, such as Figure 1 As shown, the side edges of the functional glass component 2 are wrapped with copper foil, and a conductive sponge 31 is provided between the wrapped area of ​​the functional glass component 2 and the housing 4.

[0052] The functional glass assembly 2 has copper foil edging around its sides, and conductive sponge 31 is placed between the copper foil edging area of ​​the functional glass assembly 2 and the bonding area of ​​the housing 4. The conductive sponge can effectively shield external electromagnetic interference, improve conductivity and flame retardancy, and buffer the bonding pressure of the functional glass assembly, thus reducing the thickness of the display.

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

[0054] Metal films, such as any one or a combination of metals from Al, Cu, Ag, and Au.

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

[0056] Optionally, the functional glass assembly 2 includes at least one of heated glass, touch glass, and cover glass;

[0057] The cover glass is a cover glass with at least one of the following properties: anti-reflective properties, anti-glare properties, and anti-fingerprint properties.

[0058] Among them, heated glass enables heating, and touch glass (including touch sensors) enables touch functionality.

[0059] Cover glass has one or more of the following functions: anti-reflective (AR), anti-glare (AG), and anti-fingerprint (AF).

[0060] LCD displays can select one or more types of glass as functional glass components based on specific functional requirements.

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

[0062] The edge area around CF glass 101 is like Figure 2 As shown in the shaded area at the middle edge, a conductive sponge 31 is disposed in this area, and a conductive silver paste 32 is disposed between the conductive sponge 31 and the electromagnetic shield.

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

[0064] Conductive silver paste 32 with a silver content of 60% to 70% is applied to 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 force and structural support strength of the functional glass component 2.

[0065] Optionally, such as Figure 1 As shown, the liquid crystal screen 1 includes an upper polarizer 5, which 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, such as Figure 2 As shown, 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 CF glass 101 is coated with an electromagnetic shielding layer 102. The size of the upper polarizer 5 is smaller than the size of CF glass 101. The edge area of ​​CF glass 101 ( Figure 2 The area shown in the middle shadow is not exposed and is not blocked by the upper polarizer 5.

[0070] The distance between the edge of the upper polarizer (POL) and the edge of the display area (Active Area, AA) is as follows: Figure 2 The dimension Y shown is greater than or equal to a first preset value to ensure image quality from different viewing angles.

[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 and CF have sufficient electromagnetic contact area to conduct electricity. The conducting area is as follows: Figure 3 As shown.

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

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

[0074] The dimensions described above are merely examples. In practical applications, X and Y can be other dimensions, such as Y being 2.1mm and X being 3.1mm. The electromagnetic conduction structure is constructed by adjusting the dimensions of the POL, AA areas, and the edge of the ITO LCD screen.

[0075] The electromagnetic shielding layer 102 limits the size of the polarizer attached to the shielding layer. The conductive sponge 31 attached to the surface coating area of ​​the CF glass 101 is conductive to the functional glass assembly 2. The conductive sponge 31 attached to the perimeter of the functional glass assembly 2 connects to the housing 4 to form a grounding loop, thus achieving electromagnetic conduction. Figure 3 As shown. Adding conductive sponge can effectively shield external electromagnetic interference, improve conductivity and flame retardancy, and buffer the bonding pressure of functional glass components, thus reducing the thickness of the display.

[0076] See Figure 4 , Figure 4 This application provides a method for manufacturing a liquid crystal display, applicable to the liquid crystal display described in any of the above embodiments, the method comprising:

[0077] Step 401: Evaporate an electromagnetic shielding layer onto the CF glass surface of the liquid crystal display;

[0078] Step 402: Apply conductive silver paste to the edge region of the electromagnetic shielding layer.

[0079] Step 403: After wrapping the functional glass assembly with copper foil, a conductive sponge is placed between the copper foil wrapping area and the conductive silver paste, and the functional glass assembly is connected to the electromagnetic shielding layer.

[0080] Step 404: Fit the outer shell to the copper foil edge area, and place a conductive sponge between the outer shell and the copper foil edge area.

[0081] In related technologies, electromagnetic shielding is achieved by adding a shielding film and shielding glass, and the process flow is as follows: Figure 5 As shown.

[0082] This application involves depositing an electromagnetic shielding layer onto CF glass. The fabrication process can be found in [reference needed]. Figure 6 As shown,

[0083] First, ITO or a metal film layer is deposited on the surface of the LCD screen 1CF. A polarizer is then covered on the shielding layer, and a conductive area is reserved to attach conductive sponge and apply silver paste. Next, the functional glass assembly is edged with copper foil, followed by the installation of the backlight. Finally, the casing is assembled and conductive sponge is used to connect the functional glass assembly to the casing, thus achieving electromagnetic shielding, heating, and touch functions.

[0084] The above process enables cost-effective assembly, reduces the overall thickness of LCD products, avoids manufacturing defects caused by bonding, optimizes the bill of materials (BOM), and reduces costs.

[0085] In this embodiment, an electromagnetic shielding layer is deposited on the CF glass of the liquid crystal display. This not only provides electromagnetic shielding for the liquid crystal display but also makes the product thinner and lighter while enhancing the display effect. By eliminating the external shielding method, the BOM cost is reduced. The manufacturing process reduces the use of water-based adhesives, thus reducing process defects. It also reduces reliability issues such as vibration and high / low temperatures, increasing stability and reliability.

[0086] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

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

[0088] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A liquid crystal display, characterized in that, include: The LCD screen has an electromagnetic shielding layer deposited on its CF glass surface. A functional glass assembly is stacked with the liquid crystal screen. The side edges of the functional glass assembly are wrapped with copper foil. The functional glass assembly includes at least one of heating glass, touch glass, and cover glass. A conductive connection device includes 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 edge region of the electromagnetic shielding layer is the region corresponding to the edge region around the CF glass; a conductive sponge is disposed between the copper foil-edged region and the conductive silver paste, and the functional glass assembly is connected to the electromagnetic shielding layer; The housing is fitted to the side edge of the functional glass assembly, and conductive sponge is provided between the housing and the functional glass assembly. Conductive sponge is also provided between the edge area of ​​the functional glass assembly and the housing.

2. The liquid crystal display according to claim 1, characterized in that, The electromagnetic shielding layer is an ITO layer or a metal film layer.

3. The liquid crystal display according to claim 2, characterized in that, The thickness of the ITO layer or metal film is within a preset thickness range centered at 300 nanometers.

4. The liquid crystal display according to claim 1, characterized in that, The cover glass is a cover glass with at least one of the following properties: anti-reflective properties, anti-glare properties, and anti-fingerprint properties.

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

6. The liquid crystal display according to claim 1, characterized in that, The liquid crystal screen includes 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.

7. The liquid crystal display according to any one of claims 1 to 6, 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.

8. A method for manufacturing a liquid crystal display, characterized in that, The method, applied to a liquid crystal display as described in any one of claims 1 to 7, comprises: An electromagnetic shielding layer is vapor-deposited onto the CF glass surface of the liquid crystal display. A conductive silver paste is applied to the edge region of the electromagnetic shielding layer and then cured. After the functional glass assembly is edged with copper foil, a conductive sponge is placed between the area edged with copper foil and the conductive silver paste, and the functional glass assembly is connected to the electromagnetic shielding layer. The outer shell is attached to the copper foil edging area, and a conductive sponge is placed between the outer shell and the copper foil edging area.

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