Display device

Abstract

The application discloses a display device, comprising a touch glass, a first adhesive layer, a connecting layer, a liquid crystal display module and a metal back plate which are arranged in layers; the first adhesive layer is located between the first side of the touch glass and the first side of the connecting layer; the liquid crystal display module comprises a liquid crystal display screen, the first side of the liquid crystal display screen is connected with the second side of the connecting layer, and the first side of the connecting layer and the second side of the connecting layer are two opposite sides of the connecting layer; the first side of the touch glass is provided with a first conductive area, the first adhesive layer comprises a second conductive area, the connecting layer comprises a third conductive area, and the touch glass is connected with the metal back plate through the first conductive area, the second conductive area and the third conductive area in sequence. Without additional materials, the first conductive area is arranged on the touch glass, the second conductive area is arranged on the first adhesive layer, the third conductive area is arranged on the connecting layer, so that the touch glass is conductively connected with the metal back plate, thereby reducing the risk of process failure.

Description

Technical Field

[0001] This application belongs to the field of display device technology, and specifically relates to a display device. Background Technology

[0002] Thin-film transistor liquid crystal displays (TFT-LCDs) have broad application prospects in fields such as ships, ground control cabins, and aircraft due to their characteristics of high-level information integration, high-density centralized display, and status indication. However, the complex electromagnetic systems and electromagnetic interference environments in defense and aviation fields have become significant issues that cannot be ignored in display applications. To ensure the stability and reliability of display performance, electromagnetic compatibility (EMC) has become a top priority in display development. EMC involves shielding display control, display driving, and display power supply components within the same equipotential body, utilizing conductors to absorb electromagnetic field energy, and employing the skin effect to attenuate electromagnetic field propagation.

[0003] Currently, the display area of ​​traditional touch screens does not have electromagnetic compatibility capabilities. Instead, continuous conduction is achieved by wrapping a metal layer around the backlight metal backplate or by attaching a flexible printed circuit (FPC) to the metal backplate to prevent electromagnetic interference (EMI). This adds extra materials to the production process and increases the risk of process defects. Summary of the Invention

[0004] This application provides a display device that solves the problem of poor manufacturing process.

[0005] This application provides a display device, including a touch glass, a first adhesive layer, a connecting layer, a liquid crystal display module, and a metal backplate stacked together. The first adhesive layer is located between the first side of the touch glass and the first side of the connecting layer; The liquid crystal display module includes a liquid crystal display screen, a first side of the liquid crystal display screen is connected to a second side of the connecting layer, and the first side and the second side of the connecting layer are two sides of the connecting layer that are opposite to each other. The first side of the touch glass is provided with a first conductive area, the first adhesive layer includes a second conductive area, the connecting layer includes a third conductive area, and the touch glass is connected to the metal back plate in sequence through the first conductive area, the second conductive area, and the third conductive area.

[0006] Optionally, the first conductive area is a first annular structure disposed on a first side of the touch glass, and the first annular structure is provided with silver paste.

[0007] Optionally, the second conductive region is a second ring-shaped structure, and the second ring-shaped structure is provided with conductive adhesive.

[0008] Optionally, the vertical projection of the first conductive region onto the second conductive region lies within the second conductive region, and the vertical projection of the second conductive region onto the third conductive region lies within the third conductive region.

[0009] Optionally, the first adhesive layer further includes a first region located within the second conductive region, and the first region is provided with optical adhesive.

[0010] Optionally, the connecting layer further includes a second region located within the third conductive region, wherein the second region is a conductive composite tape.

[0011] Optionally, the display device further includes a cover glass and a second adhesive layer, the second adhesive layer being located between the cover glass and the second side of the touch glass, wherein the first side and the second side of the touch glass are two sides of the touch glass that are disposed opposite to each other.

[0012] Optionally, the second adhesive layer is provided with optical adhesive.

[0013] Optionally, the liquid crystal display module further includes a backlight source located between the liquid crystal display screen and the metal backplate.

[0014] Optionally, the metal backplate includes a first folded area that folds toward the connecting layer, and the first folded area is connected to the third conductive area.

[0015] In this embodiment, the display device includes a touch glass, a first adhesive layer, a connecting layer, a liquid crystal display module, and a metal backplate stacked together. The first adhesive layer is located between a first side of the touch glass and a first side of the connecting layer. The liquid crystal display module includes a liquid crystal display screen, the first side of which is connected to a second side of the connecting layer. The first and second sides of the connecting layer are two opposite sides of the connecting layer. A first conductive area is provided on the first side of the touch glass, a second conductive area is provided on the first adhesive layer, and a third conductive area is provided on the connecting layer. The touch glass is connected to the metal backplate sequentially through the first conductive area, the second conductive area, and the third conductive area. Without adding additional materials, by providing a first conductive area on the touch glass, a second conductive area on the first adhesive layer, and a third conductive area on the connecting layer, the touch glass and the metal backplate are electrically connected, thereby reducing the risk of process defects. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of a display device (using EMI FPC) provided by related technologies. Figure 1 ; Figure 2 This is a cross-sectional schematic diagram of another display device (using an external metal layer) provided by related technologies. Figure 2 ; Figure 3 This is a cross-sectional schematic diagram of the display device provided in an embodiment of this application; Figure 4 This is a schematic diagram of the compressibility versus resistance curve of the conductive adhesive provided in the embodiments of this application; Figure 5 yes Figure 3 A schematic diagram showing the dimensions of conductive adhesive application in the area within the dashed box. Figure 6 This is a schematic diagram of the composite conductive tape provided in the embodiments of this application; Figure 7 yes Figure 6 A schematic diagram of AA in the diagram. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. 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.

[0018] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specified order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0019] Currently, the most commonly used electromagnetic compatibility methods on the market are EMI FPC and electromagnetic conduction methods with external metal layers: Among them, the electromagnetic conduction method of EMI FPC is as follows Figure 1 As shown, the FPC is bonded to connect the touchscreen ITO layer and the backlight metal backplate to achieve conductivity. This connection method is a point contact, and tests have shown that it is easily interfered with when the electric field radiation scrambling frequency is above 100MHz, making it prone to failure in radiation susceptibility (RS) tests in the aviation field.

[0020] Electromagnetic conduction method of the outer metal layer, such as Figure 2 As shown, copper foil tape is attached to the outer layer of the module to overlap the ITO layer and the backlight metal backplate to achieve conductivity. This connection method is a conductive surface contact, and after testing, it can resist electric field radiation interference of more than 100MHz. The RS test was successful. However, the pure copper surface is easily oxidized and is prone to warping under high environmental stress, leading to compatibility failure.

[0021] In response to the two electromagnetic conduction methods mentioned above, this application abandons the traditional manufacturing process of bonding EMI FPC to touch screens and integrates electromagnetic compatibility capabilities into the touch module itself. It adopts a method of using conductive adhesive to overlap the conductive composite tape around the edge of the liquid crystal display module and the ITO conductive layer on the back of the sensor, thereby optimizing the touch display module process while achieving electromagnetic compatibility performance.

[0022] The following provides a detailed description of the display device provided in this application.

[0023] Please see Figure 3 A cross-sectional schematic diagram of a display device provided in this application embodiment. As shown in the figure, the display device includes a touch glass 10, a first adhesive layer 20, a connecting layer 30, a liquid crystal display module 40, and a metal back plate 50 stacked together. The first adhesive layer 20 is located between the first side of the touch glass 10 and the first side of the connecting layer 30; The liquid crystal display module 40 includes a liquid crystal display screen 41. The first side of the liquid crystal display screen 41 is connected to the second side of the connecting layer 30. The first side and the second side of the connecting layer 30 are two sides of the connecting layer 30 that are disposed opposite to each other. The first side of the touch glass 10 is provided with a first conductive area 11, the first adhesive layer 20 includes a second conductive area 21, the connecting layer 30 includes a third conductive area 31, and the touch glass 10 is connected to the metal back plate 50 in sequence through the first conductive area 11, the second conductive area 21, and the third conductive area 31.

[0024] It should be understood that the first side of the Touch Sensor Glass 10 is typically coated with an ITO layer, which has high conductivity and optical transparency.

[0025] A first conductive region 11 is provided on a first side of the touch glass 10 to enable conductive communication. In an optional embodiment, the first conductive region 11 may be disposed around the edge of the touch glass 10 to improve conductivity.

[0026] In an optional embodiment, the first conductive region 11 may be provided with silver paste.

[0027] The first adhesive layer 20 is disposed between the first side of the touch glass 10 and the first side of the connecting layer 30 to bond the touch glass 10 and the connecting layer 30 together.

[0028] The first adhesive layer 20 includes a second conductive region 21, which, in an optional embodiment, is electrically connected to the first conductive region 11. In this embodiment, the touch glass 10 is electrically connected to the second conductive region 21 of the first adhesive layer 20 through the first conductive region 11.

[0029] In an alternative embodiment, the second conductive region 21 may be disposed around the edge of the first adhesive layer 20.

[0030] The connecting layer 30 is disposed between the first adhesive layer 20 and the liquid crystal display module 40 to bond the first adhesive layer 20 and the liquid crystal display module 40 together.

[0031] The connection layer 30 includes a third conductive region 31. In an optional embodiment, the second conductive region 21 and the third conductive region 31 are electrically connected. In this embodiment, the touch glass 10 is electrically connected to the third conductive region 31 through the first conductive region 11, the second conductive region 21, and the third conductive region 31.

[0032] In an alternative embodiment, the third conductive region 31 may also be disposed around the edge of the connecting layer 30.

[0033] It should be noted that, as Figure 3 As shown, the first conductive region 11, the second conductive region 21, and the third conductive region 31 should have an overlapping area in the vertical direction, wherein the overlapping area is used for the conduction of the first conductive region 11, the second conductive region 21, and the third conductive region 31. In this embodiment, the overlapping area of ​​the first conductive region 11, the second conductive region 21, and the third conductive region 31 can be achieved by adjusting the position and size of the three conductive regions, and this embodiment does not limit this.

[0034] The metal backplate 50 is disposed on the other side of the liquid crystal display module 40 opposite to the aforementioned connecting layer 30, and the metal backplate 50 is electrically connected to the third conductive area 31 of the connecting layer 30. Thus, the touch glass 10 is electrically connected to the metal backplate 50 through the first conductive area 11, the second conductive area 21, and the third conductive area 31 in sequence, thereby realizing the conduction of the electromagnetic compatibility circuit.

[0035] In this embodiment, the display device includes a touch glass 10, a first adhesive layer 20, a connecting layer 30, a liquid crystal display module 40, and a metal backplate 50 stacked together. The first adhesive layer 20 is located between a first side of the touch glass 10 and a first side of the connecting layer 30. The liquid crystal display module 40 includes a liquid crystal display screen 41, the first side of which is connected to a second side of the connecting layer 30. The first side and the second side of the connecting layer 30 are two opposite sides of the connecting layer 30. A first conductive area 11 is provided on the first side of the touch glass 10. The first adhesive layer 20 includes a second conductive area 21, and the connecting layer 30 includes a third conductive area 31. The touch glass 10 is connected to the metal backplate 50 sequentially through the first conductive area 11, the second conductive area 21, and the third conductive area 31. Without adding any additional materials, the touch glass 10 is electrically connected to the metal backplate 50 by setting a first conductive area 11 in the touch glass 10, a second conductive area 21 in the first adhesive layer 20, and a third conductive area 31 in the connecting layer 30, thereby reducing the risk of process defects.

[0036] Optionally, the first conductive region 11 is a first annular structure disposed on the first side of the touch glass 10, and the first annular structure is provided with silver paste.

[0037] In this embodiment, by providing a first annular structure on the first side of the touch glass 10 and providing silver paste within the first annular structure, the silver paste has good conductivity, thereby enabling the second conductive area 21 of the first adhesive layer 20 connected to the first side of the touch glass 10 to achieve conductivity.

[0038] Optionally, the second conductive region 21 is a second annular structure, and the second annular structure is provided with conductive adhesive.

[0039] In this embodiment, by setting the second conductive area 21 as a second ring structure and providing conductive adhesive inside the second ring structure, the second conductive area 21 and the first conductive area 11 on the first side of the touch glass 10 are made conductive.

[0040] In an optional embodiment, the conductive adhesive may be refined from a silver-nickel-filled silicone adhesive, compounded with a variety of high-performance conductive particles.

[0041] In an optional embodiment, conductive adhesive is applied between the conductive area on the back of the sensor glass and the third conductive area 31 (exposed area of ​​the conductive composite material) of the connecting layer 30. This enhances the electron transport capability between the ITO conductive layer and the conductive composite tape through the overlapping and tunneling effect formed by the dense accumulation of silver-nickel particles. During gap application, the resistance decreases with compression, improving conductivity. After curing, it exhibits good elastic recovery capability, such as... Figure 4 As shown.

[0042] Optionally, the vertical projection of the first conductive region 11 onto the second conductive region 21 is located within the second conductive region 21, and the vertical projection of the second conductive region 21 onto the third conductive region 31 is located within the third conductive region 31.

[0043] In an alternative embodiment, such as Figure 5 As shown, the conductive adhesive coating width can be set to ≥3mm, and the sensor plating AG RING width can be ≥2mm, so that the conductive adhesive and AG RING have sufficient electromagnetic contact area to conduct electricity.

[0044] Optionally, the first adhesive layer 20 further includes a first region 22 located within the second conductive region 21, and the first region 22 is provided with optical adhesive.

[0045] Optionally, the connecting layer 30 further includes a second region 32, which is located within the third conductive region 31, and the second region 32 is a conductive composite tape.

[0046] It should be understood that conductive composite tape replaces the role of Cell Tape (edge-binding tape) in conventional NB modules, tightly wrapping the LCD screen 41 and backlight to form the LCD display module 40.

[0047] In an optional real-time example, such as Figure 6 and Figure 7As shown, the protruding parts on the front and sides of the attached LCD screen 41 are double-sided conductive, which improves the Z-conductivity of the module. The outer surface of the attached backlight sidewall and back part is coated with insulating ink, which is single-sided conductive, ensuring electrical insulation protection of the exposed surface of the conductive composite tape, preventing short circuits between the module and the external metal structure, while improving scratch resistance, moisture resistance and corrosion resistance, and ensuring the safe and reliable operation of the module.

[0048] It should be understood that the conductive composite tape has an insulating surface. In an optional embodiment, the third conductive region 31 may be a conductive composite tape with the surface insulating layer removed, which has a double-sided conductive function. In this embodiment, by providing a third conductive region 31 with a double-sided conductive function, the metal back plate 50 and the second conductive region 21 are made conductive.

[0049] Optionally, the display device further includes a cover glass 60 and a second adhesive layer 70, the second adhesive layer 70 being located between the cover glass 60 and the second side of the touch glass 10, the first side and the second side of the touch glass 10 being two sides of the touch glass 10 that are disposed opposite to each other.

[0050] In this embodiment, a second adhesive layer 70 is provided to bond the cover glass 60 and the touch glass 10 together.

[0051] Optionally, the second adhesive layer 70 is provided with optical adhesive.

[0052] Optionally, the liquid crystal display module 40 further includes a backlight source located between the liquid crystal display screen 41 and the metal back plate 50.

[0053] Optionally, the metal back plate 50 includes a first folding region 51 folded toward the connecting layer 30, and the first folding region 51 is connected to the third conductive region 31.

[0054] In this embodiment, the metal back plate 50 is further provided with a first folding area 51 that folds towards the connecting layer 30. The first folding area 51 after folding is connected to the third conductive area 31, thereby realizing the conduction between the metal back plate 50 and the third conductive area 31.

[0055] 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 display device, characterized in that, It includes a layered touch glass, a first adhesive layer, a connecting layer, a liquid crystal display module, and a metal backplate. The first adhesive layer is located between the first side of the touch glass and the first side of the connecting layer; The liquid crystal display module includes a liquid crystal display screen, a first side of the liquid crystal display screen is connected to a second side of the connecting layer, and the first side and the second side of the connecting layer are two sides of the connecting layer that are opposite to each other. The first side of the touch glass is provided with a first conductive area, the first adhesive layer includes a second conductive area, the connecting layer includes a third conductive area, and the touch glass is connected to the metal back plate in sequence through the first conductive area, the second conductive area, and the third conductive area.

2. The display device according to claim 1, characterized in that, The first conductive area is a first annular structure disposed on the first side of the touch glass, and the first annular structure is provided with silver paste.

3. The display device according to claim 2, characterized in that, The second conductive region is a second ring-shaped structure, and the second ring-shaped structure is provided with conductive adhesive.

4. The display device according to claim 3, characterized in that, The vertical projection of the first conductive region onto the second conductive region lies within the second conductive region, and the vertical projection of the second conductive region onto the third conductive region lies within the third conductive region.

5. The display device according to claim 1, characterized in that, The first adhesive layer further includes a first region located within the second conductive region, and the first region is provided with optical adhesive.

6. The display device according to claim 1, characterized in that, The connecting layer further includes a second region located within the third conductive region, and the second region is a conductive composite tape.

7. The display device according to claim 1, characterized in that, The display device further includes a cover glass and a second adhesive layer, the second adhesive layer being located between the cover glass and the second side of the touch glass, the first side and the second side of the touch glass being two sides of the touch glass that are disposed opposite to each other.

8. The display device according to claim 7, characterized in that, The second adhesive layer is provided with optical adhesive.

9. The display device according to claim 1, characterized in that, The liquid crystal display module also includes a backlight, which is located between the liquid crystal display screen and the metal back plate.

10. The display device according to claim 9, characterized in that, The metal backplate includes a first folded area that folds toward the connecting layer, and the first folded area is connected to the third conductive area.

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