Liquid crystal display and electronic device

Abstract

The application provides a liquid crystal display and an electronic device, and belongs to the technical field of display devices.The liquid crystal display comprises a liquid crystal display assembly, a first polaroid and an electromagnetic shielding layer; the liquid crystal display assembly is used for outputting imaging light rays carrying to-be-displayed information; the electromagnetic shielding layer is arranged between the first polaroid and the liquid crystal display assembly, and is used for inhibiting mutual electromagnetic interference between the liquid crystal display assembly and an external environment; the electromagnetic shielding layer has a light transmission characteristic; and the first polaroid is used for performing polarization regulation and control on the imaging light rays that pass through the electromagnetic shielding layer. The liquid crystal display can effectively reduce its own weight.

Description

Technical Field

[0001] This application relates to the field of display device technology, and more particularly to a liquid crystal display screen and an electronic device. Background Technology

[0002] LCD screens are prone to generating electromagnetic radiation that interferes with the external environment during operation, and are also susceptible to electromagnetic interference from the external environment. Therefore, the current mainstream solution is to place a shielding layer on the outside of the LCD screen to ensure that the LCD screen meets the requirements for electromagnetic compatibility (EMC). At the same time, optically clear adhesive (OCA) is used to bond the shielding layer between the LCD screen and the external substrate, thus providing protection for the shielding layer. Since the external substrate itself has a certain thickness and density, its additional layer on the outside of the LCD screen results in a greater weight for the LCD screen. Summary of the Invention

[0003] This application provides a liquid crystal display screen and an electronic device that can solve the technical problem of the large weight of liquid crystal display screens.

[0004] In a first aspect, embodiments of this application provide a liquid crystal display screen, the liquid crystal display screen comprising:

[0005] Liquid crystal display assembly, first polarizer and electromagnetic shielding layer;

[0006] The liquid crystal display component is used to output imaging light carrying the information to be displayed;

[0007] The electromagnetic shielding layer is disposed between the first polarizer and the liquid crystal display component. The electromagnetic shielding layer is used to suppress mutual electromagnetic interference between the liquid crystal display component and the external environment, and the electromagnetic shielding layer has light transmission characteristics.

[0008] The first polarizer is used to polarize the imaging light that passes through the electromagnetic shielding layer.

[0009] Optionally, the liquid crystal display assembly includes: a liquid crystal layer, a thin film transistor (TFT) array substrate, a second polarizer, a backlight module, and a circuit board, which are stacked sequentially from the direction close to the electromagnetic shielding layer to the direction away from the electromagnetic shielding layer, wherein the electromagnetic shielding layer is disposed between the liquid crystal layer and the first polarizer.

[0010] The circuit board is electrically connected to the backlight module and the TFT array substrate respectively. The circuit board is used to provide power to the backlight module and the TFT array substrate. The circuit board is also used to provide control signals to the TFT array that are associated with the information to be displayed.

[0011] The backlight module is used to provide illumination light for the second polarizer;

[0012] The second polarizer is used to convert the illumination light into polarized light with a target polarization angle;

[0013] The TFT array substrate is used to adjust the deflection angle of the liquid crystal molecules in the liquid crystal layer according to the control signal;

[0014] The liquid crystal layer is used to output imaging light carrying the information to be displayed, based on the polarized light at the target polarization angle and the deflection angle of the liquid crystal molecules.

[0015] Optionally, the liquid crystal display assembly further includes: a color filter substrate and a color filter film disposed between the liquid crystal layer and the first polarizer;

[0016] The color filter substrate is located on the side close to the first polarizer, and the color filter substrate is used to support the color filter film and the electromagnetic shielding layer;

[0017] The color filter film is located on the side close to the liquid crystal layer, and the color filter film is used to adjust the color of the imaging light;

[0018] The electromagnetic shielding layer is sandwiched between the color filter substrate and the color filter film, and the electromagnetic shielding layer completely covers the liquid crystal layer.

[0019] Optionally, the liquid crystal display screen further includes: a first conductive element;

[0020] The first conductive element is electrically connected to the grounding circuit of the circuit board and the electromagnetic shielding layer, respectively.

[0021] Optionally, the first conductive element at least partially comprises a metal conductive filler, and the first conductive element partially covers at least one of the color filter substrate, the liquid crystal layer, the TFT array substrate, the second polarizer, and the backlight module.

[0022] Optionally, the first conductive element is made of silver paste, and the first conductive element is disposed at intervals on both sides of the color filter substrate, the liquid crystal layer, the TFT array substrate, the second polarizer and the backlight module.

[0023] Optionally, the circuit board includes: a printed circuit board assembly (PCBA), a flexible printed circuit board (FPC), and a metal backplate;

[0024] The PCBA is electrically connected to the backlight module and the TFT array substrate via the FPC;

[0025] The metal backplate covers the side of the backlight module facing away from the first polarizer, and the metal backplate also covers the first conductive element, the color filter substrate, the liquid crystal layer, the TFT array substrate, the second polarizer, and the side of the backlight module.

[0026] Optionally, the FPC is provided with multiple grounding circuits electrically connected to the first conductive element. The grounding circuit of the TFT array substrate, the electromagnetic shielding layer and the grounding circuit of the backlight module are short-circuited and connected to the metal backplate through the grounding circuit of the PCBA and the multiple grounding circuits.

[0027] Optionally, the electromagnetic shielding layer adopts a metal mesh structure, and the metal mesh structure is made of indium tin oxide material.

[0028] Secondly, embodiments of this application provide an electronic device, including: a liquid crystal display screen as described in the first aspect.

[0029] This application provides a liquid crystal display screen, comprising: a liquid crystal display component, a first polarizer, and an electromagnetic shielding layer; the liquid crystal display component is used to output imaging light carrying information to be displayed; the electromagnetic shielding layer is disposed between the first polarizer and the liquid crystal display component, and the electromagnetic shielding layer is used to suppress mutual electromagnetic interference between the liquid crystal display component and the external environment, and the electromagnetic shielding layer has light transmission characteristics; the first polarizer is used to perform polarization control on the imaging light transmitted through the electromagnetic shielding layer. Since the electromagnetic shielding layer is disposed between the first polarizer and the liquid crystal display component, it can be directly protected and isolated by the first polarizer; no additional external substrate is required to protect the shielding layer, reducing material stacking on the liquid crystal display screen and lowering the weight of the liquid crystal display screen. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0031] Figure 1 This is one of the structural schematic diagrams of a liquid crystal display screen provided in the embodiments of this application;

[0032] Figure 2 This is an exploded view of the structure of a liquid crystal display screen provided in an embodiment of this application;

[0033] Figure 3This is a second schematic diagram of the structure of a liquid crystal display screen provided in the embodiments of this application;

[0034] Figure 4 This is the third schematic diagram of the structure of a liquid crystal display screen 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] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably 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, the first object can be one or more. Furthermore, "and / or" in this application indicates at least one of the connected objects. For example, the scope of protection of "A and / or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. Additionally, the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0037] See Figures 1 to 4 The liquid crystal display screen 100 includes: a liquid crystal display component 3, a first polarizer 1, and an electromagnetic shielding layer 2;

[0038] The liquid crystal display component 3 is used to output imaging light carrying the information to be displayed;

[0039] The electromagnetic shielding layer 2 is disposed between the first polarizer 1 and the liquid crystal display component 3. The electromagnetic shielding layer 2 is used to suppress the mutual electromagnetic interference between the liquid crystal display component 3 and the external environment, and the electromagnetic shielding layer 2 has light transmission characteristics.

[0040] The first polarizer 1 is used to control the polarization of the imaging light that passes through the electromagnetic shielding layer 2.

[0041] The information to be displayed can be image information or video information to be displayed; the external environment can be the working environment outside the LCD display, which may include other circuit boards, high-speed signal modules and / or power modules that generate electromagnetic noise adjacent to or close to the LCD display 100, as well as peripheral devices, radio frequency equipment or high-voltage working devices that emit electromagnetic radiation in the space outside the LCD display 100; the electromagnetic fields radiated by the above devices can easily cause electromagnetic interference to the LCD display component 3 in the LCD display, and conversely, the electromagnetic waves radiated outward by the LCD display component 3 can also cause electromagnetic interference to the above devices.

[0042] Since the electromagnetic shielding layer 2 is disposed between the first polarizer 1 and the liquid crystal display component 3, compared with the prior art where the electromagnetic shielding layer 2 is bonded between the liquid crystal display screen 100 and the external substrate, it has at least the following advantages:

[0043] Firstly, from the perspective of the source of electromagnetic interference, the internal working units of the liquid crystal display component 3 (such as circuit boards and various driving lines) generate electromagnetic interference signals. In the prior art, an electromagnetic shielding layer 2 is superimposed on the outside of the liquid crystal display screen 100. The electromagnetic shielding layer 2 is far away from the source of electromagnetic interference (liquid crystal display component 3), which easily leads to electromagnetic wave leakage and insufficient anti-interference. This application embeds the electromagnetic shielding layer 2 inside the liquid crystal display screen 100, closer to the liquid crystal display component 3 that generates electromagnetic interference. This can form a close-range shielding barrier against the interference source, internally suppressing electromagnetic radiation leakage and improving radiated emission (RE) performance; in addition, it resists the intrusion of external electromagnetic waves and improves the radiated susceptibility (RS) of the liquid crystal display screen 100; it can significantly suppress the mutual electromagnetic interference between the liquid crystal display component 3 and the external environment. Thus, it significantly improves the electromagnetic compatibility (EMC) performance of the liquid crystal display screen 100 in terms of both radiated emission and radiated susceptibility.

[0044] Secondly, the electromagnetic shielding layer 2 is located between the first polarizer 1 and the liquid crystal display component 3, and can be directly protected and isolated by the first polarizer 1, which can avoid direct exposure of the shielding layer and reduce the risk of scratches, oxidation, and short circuits. It can improve the working reliability and service life of the liquid crystal display 100. In addition, since the external substrate (such as external glass or external acrylic sheet) and adhesive layer (such as optical transparent adhesive) can be eliminated, the weight and thickness of the liquid crystal display 100 can be reduced. It is especially suitable for applications such as aerospace or industrial control equipment where weight and thinness are highly required.

[0045] Among them, the electromagnetic shielding layer 2 has light-transmitting characteristics, and can specifically adopt a metal mesh structure or a transparent film structure as described later; because the electromagnetic shielding layer 2 has light-transmitting characteristics, it allows the imaging light carrying the information to be displayed to pass through normally, without causing adverse effects such as blocking or attenuation of the imaging light, and can ensure the normal display effect of the liquid crystal display screen 100.

[0046] The first polarizer 1 can protect the electromagnetic shielding layer 2 from scratches and oxidation damage. On the other hand, it can polarize the imaging light passing through the electromagnetic shielding layer 2 to ensure the normal operation of the liquid crystal display screen 100.

[0047] In this embodiment, since the electromagnetic shielding layer 2 is located between the first polarizer 1 and the liquid crystal display component 3, it can be directly protected and isolated by the first polarizer 1. No additional external substrate is needed to protect the shielding layer, reducing material stacking on the liquid crystal display 100 and lowering its weight. Furthermore, because the electromagnetic shielding layer 2 is closer to the liquid crystal display component 3, which generates electromagnetic interference, it internally suppresses electromagnetic radiation leakage from the liquid crystal display component 3 and externally resists electromagnetic wave intrusion from the external environment. This significantly suppresses mutual electromagnetic interference between the liquid crystal display component 3 and the external environment, improving the electromagnetic compatibility performance of the liquid crystal display 100.

[0048] In some implementations, reference Figure 2 , Figure 2 This is a second schematic diagram of the structure of a liquid crystal display screen provided in the embodiments of this application, as shown below. Figure 2 As shown, the liquid crystal display assembly 3 includes: a liquid crystal layer 31, a thin-film transistor (TFT) array substrate 32, a second polarizer 33, a backlight unit (BLU) 34, and a circuit board, which are stacked sequentially from the direction close to the electromagnetic shielding layer 2 to the direction away from the electromagnetic shielding layer 2. The electromagnetic shielding layer 2 is disposed between the liquid crystal layer 31 and the first polarizer 1.

[0049] The circuit board is electrically connected to the backlight module 34 and the TFT array substrate 32 respectively. The circuit board is used to provide power to the backlight module 34 and the TFT array substrate 32. The circuit board is also used to provide control signals to the TFT array substrate 32 that are associated with the information to be displayed.

[0050] The backlight module 34 is used to provide illumination light for the second polarizer 33;

[0051] The second polarizer 33 is used to convert the illumination light into polarized light with the target polarization angle;

[0052] The TFT array substrate 32 is used to adjust the deflection angle of the liquid crystal molecules in the liquid crystal layer 31 according to the control signal.

[0053] The liquid crystal layer 31 is used to output imaging light carrying the information to be displayed based on the polarization angle of the target polarization light and the deflection angle of the liquid crystal molecules.

[0054] The backlight module 34 may include multiple backlight zones, and each backlight zone may include a preset number of light-emitting diodes or light-emitting lamps to provide illumination light for the second polarizer 33.

[0055] Both the first polarizer 1 and the second polarizer 33 can be absorptive polarizers or linear polarizers, such as polyvinyl alcohol (PVA) absorptive polarizers; reflective polarizers can also be used, as long as they meet the requirements for polarization control of light. In this application, the first polarizer 1 can also be referred to as the upper polarizer (UP POL), and the second polarizer 33 can also be referred to as the bottom polarizer.

[0056] The TFT array substrate 32 may include a preset number of TFT switches, with each pixel corresponding to one or more TFTs; the deflection of the liquid crystal molecules corresponding to each pixel is precisely controlled by a control signal.

[0057] The liquid crystal layer 31 can be a liquid crystal material layer, including multiple liquid crystal molecules corresponding to pixels. The liquid crystal molecules themselves do not emit light, but the deflection angle of the liquid crystal molecules can be changed by the driving voltage of the TFT array substrate 32 to modulate the polarized light with the target polarization angle generated by the second polarizer 33, and output imaging light carrying the information to be displayed.

[0058] In this embodiment, on the one hand, since the electromagnetic shielding layer 2 is disposed between the liquid crystal layer 31 and the first polarizer 1, the liquid crystal layer 31 and the first polarizer 1 form protection for the electromagnetic shielding layer 2, eliminating the need for an external substrate and reducing the weight and thickness of the liquid crystal display screen 100. On the other hand, the electromagnetic shielding layer 2 is closer to the liquid crystal layer 31 and the TFT array substrate 32, which are the main sources of electromagnetic interference, further reducing the internal and external electromagnetic interference of the liquid crystal display screen 100 and improving the EMC performance of the liquid crystal display screen 100. In addition, the backlight module 34, the second polarizer 33, the TFT array substrate 32, and the liquid crystal layer 31 cooperate with each other to complete the light modulation normally and output the imaging light carrying the information to be displayed, thus ensuring the normal display function of the liquid crystal display screen 100 while achieving shielding protection and weight reduction.

[0059] In some implementations, reference Figure 2 The liquid crystal display assembly 3 also includes: a color filter substrate 35 and a color filter film 36 disposed between the liquid crystal layer 31 and the first polarizer 1;

[0060] The color filter substrate 35 is located on the side close to the first polarizer 1, and the color filter substrate 35 is used to support the color filter film 36 and the electromagnetic shielding layer 2.

[0061] The color filter 36 is located on the side close to the liquid crystal layer 31, and the color filter 36 is used to adjust the color of the imaging light;

[0062] The electromagnetic shielding layer 2 is sandwiched between the color filter substrate 35 and the color filter film 36, and the electromagnetic shielding layer 2 completely covers the liquid crystal layer 31.

[0063] The color filter substrate 35 can be a color filter glass (GF glass) or a transparent optical glass substrate; the color filter (CF) film 36 can be a photoresist film layer containing red, green, and blue pixel color resists, and may also be provided with a black matrix (specifically, it can be a black light-blocking material distributed between the red, green, and blue resists). The black matrix is ​​located between each color resist to block light leakage between pixels and improve display contrast.

[0064] The electromagnetic shielding layer 2 is integrated between the CF film and the CF Glass. Unlike the traditional external stacked shielding solution, it can form electromagnetic isolation protection in the screen display window area, effectively blocking the mutual interference of internal and external electromagnetic signals.

[0065] In this embodiment, the electromagnetic shielding layer 2 is sandwiched between the color filter substrate 35 and the color filter film 36, completely covering the liquid crystal layer 31. The electromagnetic shielding layer 2 is supported and positioned by the color filter substrate 35, resulting in a stable structure that is not easily shifted. Simultaneously, the color filter substrate 35, together with the first polarizer 1, forms a protective layer for the electromagnetic shielding layer 2, eliminating the need for an additional external protective substrate and maintaining the slim and low-stack structural advantages of the liquid crystal display screen 100. The color filter film 36 modulates the imaging light to ensure normal color display. The embedded, fully covered electromagnetic shielding layer 2, located adjacent to the liquid crystal display area, effectively blocks the leakage of electromagnetic radiation generated by the liquid crystal components and resists external electromagnetic interference. Without affecting light transmission imaging and color display, it significantly improves the overall electromagnetic compatibility performance and structural reliability of the liquid crystal display screen 100.

[0066] In some implementations, reference Figures 2 to 4 The LCD screen 100 also includes: a first conductive element 4;

[0067] The first conductive element 4 is electrically connected to the grounding circuit and the electromagnetic shielding layer 2 of the circuit board, respectively.

[0068] The first conductive element 4 can be a metal sheet, conductive adhesive, or composite conductive film with conductive properties, or it can be a composite conductive component made of metal conductive filler described later; the first conductive element 4 is used to realize a reliable electrical connection between the electromagnetic shielding layer 2 and the grounding circuit of the circuit board.

[0069] In this embodiment, the electromagnetic shielding layer 2 is electrically connected to the grounding circuit of the circuit board through the first conductive element 4, so that the electromagnetic shielding layer 2 is grounded. This can effectively discharge the charge and electromagnetic noise generated by electromagnetic interference, further improve the electromagnetic shielding layer 2's ability to suppress the leakage of internal electromagnetic radiation and the intrusion of external electromagnetic waves, and enhance the overall electromagnetic compatibility performance of the liquid crystal display screen 100.

[0070] In some embodiments, the first conductive element 4 at least partially includes a metal conductive filler, and the first conductive element 4 partially covers at least one of the color filter substrate 35, liquid crystal layer 31, TFT array substrate 32, second polarizer 33 and backlight module 34.

[0071] The metallic conductive filler may include at least one of silver powder, copper powder, nickel powder, or silver paste (described later), used to impart good conductivity to the first conductive element 4. Simultaneously, the metallic conductive filler can fit into the limited space on the side of the liquid crystal display assembly 3, facilitating processing and placement, and together with the partially encapsulated structure and the electromagnetic shielding layer 2, forms an electromagnetic shielding structure.

[0072] In this embodiment, the first conductive element 4 contains a metal conductive filler to ensure its own conductive grounding performance. The first conductive element 4 partially covers at least one of the color filter substrate 35, liquid crystal layer 31, TFT array substrate 32, second polarizer 33 and backlight module 34, which can cooperate with the electromagnetic shielding layer 2 to form an enclosed electromagnetic shielding structure and expand the electromagnetic shielding coverage. This can effectively discharge interference charges to the grounding circuit and suppress the leakage of electromagnetic signals and the injection of external interference from the side, further improving the electromagnetic shielding effectiveness and electromagnetic compatibility performance of the liquid crystal display screen 100.

[0073] In some embodiments, the first conductive element 4 is made of silver paste, and the first conductive element 4 is disposed at intervals on both sides of the color filter substrate 35, the liquid crystal layer 31, the TFT array substrate 32, the second polarizer 33 and the backlight module 34.

[0074] Among them, silver paste can be a type of cured conductive paste containing silver metallic conductive filler. See also Figure 2 The first conductive element 4 may be an Argentum Dot (Ag Dot), which is spaced apart on both sides of the color filter substrate 35, the liquid crystal layer 31, the TFT array substrate 32, the second polarizer 33 and the backlight module 34.

[0075] In this embodiment, on the one hand, the first conductive element 4 is made of silver paste, which has excellent conductivity after curing, enabling a reliable electrical connection between the electromagnetic shielding layer 2 and the grounding circuit of the circuit board, and timely dissipating electromagnetic interference charges. On the other hand, the silver paste can fit into the narrow space on the side of the liquid crystal display component 3, facilitating coating processing.

[0076] In some embodiments, the circuit board includes: a printed circuit board assembly (PCBA), a flexible printed circuit board (FPC) (372), and a metal backplate (373).

[0077] The PCBA is electrically connected to the backlight module 34 and the TFT array substrate 32 via the FPC.

[0078] The metal backplate 373 covers the side of the backlight module 34 facing away from the first polarizer 1, and the metal backplate 373 covers the first conductive element 4, as well as the side of the color filter substrate 35, the liquid crystal layer 31, the TFT array substrate 32, the second polarizer 33 and the backlight module 34.

[0079] The metal backplate 373 can be made of at least one of aluminum alloy, stainless steel, copper plate or galvanized steel plate.

[0080] In this embodiment, the PCBA serves as the power supply for the main control, achieving electrical interconnection with the backlight module 34 and the TFT array substrate 32 via the FPC, ensuring signal transmission and power supply. A metal backplate 373 is arranged on the back side of the backlight module 34, simultaneously covering the first conductive element 4, as well as the color filter substrate 35, liquid crystal layer 31, TFT array substrate 32, second polarizer 33, and the sides of the backlight module 34. On one hand, it provides structural support and heat dissipation protection; on the other hand, it works in conjunction with the electromagnetic shielding layer 2 and the first conductive element 4 to form a closed shielding cavity, further suppressing electromagnetic signal leakage from the screen side and blocking external electromagnetic interference. The metal backplate 373 covering the first conductive element 4 stabilizes its assembly position, ensuring reliable grounding. The overall structure balances electrical connection, mechanical protection, and electromagnetic shielding, effectively improving the structural stability of the display screen and the overall electromagnetic compatibility performance.

[0081] In some embodiments, the FPC is provided with multiple grounding circuits electrically connected to the first conductive element 4. The grounding circuits of the TFT array substrate 32, the electromagnetic shielding layer 2, and the backlight module 34 are short-circuited and connected to the metal backplate 373 through the grounding circuit of the PCBA and the multiple grounding circuits.

[0082] The multiple grounding circuits set on the FPC can be multiple ground (GND) traces; the grounding circuit of the PCBA can include copper foil openings (e.g., PCBA grounding pad 374) and grounding copper foil 375 (Copper); specifically, the grounding circuit of the TFT array substrate 32, the electromagnetic shielding layer 2 and the backlight module 34 are all electrically connected to the FPC, the FPC is electrically connected to the PCBA, and the grounding copper foil 375 is short-circuited and connected to the metal backplate 373 through the PCBA grounding pad 374.

[0083] In this embodiment, the grounding circuit of the TFT array substrate 32, the electromagnetic shielding layer 2, and the grounding circuit of the backlight module 34 are connected to the metal backplate 373 through the PCBA grounding circuit and multiple grounding circuits on the FPC, thereby achieving multi-point short-circuit conduction. This connects the electromagnetic shielding layer 2, the TFT array substrate 32, the FPC, the PCBA, and the metal backplate 373 to form a continuous and complete grounding shielding network, thereby improving the electromagnetic shielding effect and EMC performance of the liquid crystal display screen 100.

[0084] In some embodiments, the electromagnetic shielding layer 2 adopts a metal mesh structure, and the metal mesh structure is made of indium tin oxide (ITO) material.

[0085] Among them, since the electromagnetic shielding layer 2 is made of ITO material, it can also be called ITO layer or ITO shielding layer;

[0086] In this embodiment, an ITO metal mesh structure is used as the electromagnetic shielding layer 2, which has excellent conductivity, can achieve efficient electromagnetic shielding, and suppress electromagnetic interference of the whole machine; at the same time, the mesh structure can ensure light transmittance and avoid obstructing the display light path of the liquid crystal display screen 100, thus balancing the shielding effect and the display light transmittance requirements.

[0087] For example, refer to Figure 2 The ITO shielding layer, located between the CF film and the CF GLASS, serves as a shield. The silver paste dots act as the first conductive element 4, connecting the shielding layer and the TFT array substrate 32 to ground. The FPC connects the TFT substrate to the grounding circuit of the PCBA. The copper window of the PCBA is connected to the metal backplate 373 of the LCD display 100 via the grounding copper foil 375. The electromagnetic shielding layer 2, the grounding circuit of the TFT array substrate 32, the grounding circuit of the PCBA, the grounding circuit of the FPC, and the metal backplate 373 form a multi-point short circuit, and the electromagnetic shielding layer 2 and the entire LCD display 100 form a complete and closed grounding network, which provides complete grounding shielding for the display window of the LCD display 100 and greatly improves electromagnetic compatibility (including radiation emission and radiation sensitivity).

[0088] This application constructs an integrated built-in shielding and grounding system through the cooperation of the above structures, thoroughly optimizing the electromagnetic compatibility performance and lightweight structure of the LCD display 100. In this application, the electromagnetic shielding layer 2 is integrated between the CF and GFGlass; unlike existing external stacked shielding schemes, it can form electromagnetic isolation protection in the screen display window area, effectively blocking mutual interference between internal and external electromagnetic signals. The silver paste dots, as key conductive nodes, can stably achieve reliable conduction between the electromagnetic shielding layer 2 and the grounding circuit of the lower TFT array substrate 32, solving the problem of weak shielding performance caused by the floating potential of the shielding layer.

[0089] Simultaneously, the FPC further connects the grounding circuit of the TFT array substrate 32 to the grounding circuit of the PCBA, realizing the step-by-step connection of the shielding loop. The grounding pad 374 of the PCBA can concentrate the grounding signal and reliably connect to the metal backplate 373 through the grounding copper foil 375. Through the above structural design, this application forms a multi-point, full-link short-circuit conduction of the electromagnetic shielding layer 2, TFT array substrate 32, FPC, PCBA and metal backplate 373, constructing a complete, closed and continuous whole-machine grounding shielding network, which can achieve all-round electromagnetic shielding protection for the display window of the LCD screen 100, effectively optimize the two core EMC indicators of radiated emission and radiation sensitivity, and significantly improve the working stability of the LCD screen 100 in complex electromagnetic environments such as civil aviation and industrial control. At the same time, it abandons the heavy structure of traditional external shielding glass and bonding adhesive layer, significantly reducing the overall weight and thickness of the screen, and realizing the dual technical advantages of high electromagnetic compatibility performance and product thinness and high integration.

[0090] In some embodiments, this application also provides an electronic device, including any of the above-described liquid crystal displays 100.

[0091] The LCD screen 100 can serve as a display component for electronic devices, used to output images, text, and interactive interfaces, providing users with intuitive feedback on device operating status and operational information. The LCD screen 100 can be electrically connected to the main control module inside the electronic device, receiving display signals from the main control module and completing image rendering output. It can be used in conjunction with a touchscreen to achieve human-computer interaction, meeting daily viewing, operation, and control needs.

[0092] In this embodiment, since the electronic device is equipped with the aforementioned liquid crystal display screen 100, the lightweight design and improved electromagnetic compatibility performance achieved by relying on the liquid crystal display screen 100 can effectively reduce the overall weight of the electronic device, which is beneficial for the lightweighting of the electronic device. On the other hand, it can enhance the electromagnetic interference suppression capability of the electronic device, improve the EMC capability of the electronic device, reduce the interference of electromagnetic noise on the display output, and improve the working reliability of the electronic device.

[0093] 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 screen, characterized in that, include: Liquid crystal display assembly, first polarizer and electromagnetic shielding layer; The liquid crystal display component is used to output imaging light carrying the information to be displayed; The electromagnetic shielding layer is disposed between the first polarizer and the liquid crystal display component. The electromagnetic shielding layer is used to suppress mutual electromagnetic interference between the liquid crystal display component and the external environment, and the electromagnetic shielding layer has light transmission characteristics. The first polarizer is used to polarize the imaging light that passes through the electromagnetic shielding layer.

2. The liquid crystal display screen according to claim 1, characterized in that, The liquid crystal display assembly includes: a liquid crystal layer, a thin film transistor (TFT) array substrate, a second polarizer, a backlight module, and a circuit board, which are stacked sequentially from the direction close to the electromagnetic shielding layer to the direction away from the electromagnetic shielding layer, and the electromagnetic shielding layer is disposed between the liquid crystal layer and the first polarizer. The circuit board is electrically connected to the backlight module and the TFT array substrate respectively. The circuit board is used to provide power to the backlight module and the TFT array substrate. The circuit board is also used to provide control signals to the TFT array that are associated with the information to be displayed. The backlight module is used to provide illumination light for the second polarizer; The second polarizer is used to convert the illumination light into polarized light with a target polarization angle; The TFT array substrate is used to adjust the deflection angle of the liquid crystal molecules in the liquid crystal layer according to the control signal; The liquid crystal layer is used to output imaging light carrying the information to be displayed, based on the polarized light at the target polarization angle and the deflection angle of the liquid crystal molecules.

3. The liquid crystal display screen according to claim 2, characterized in that, The liquid crystal display assembly further includes: a color filter substrate and a color filter film disposed between the liquid crystal layer and the first polarizer; The color filter substrate is located on the side close to the first polarizer, and the color filter substrate is used to support the color filter film and the electromagnetic shielding layer; The color filter film is located on the side close to the liquid crystal layer, and the color filter film is used to adjust the color of the imaging light; The electromagnetic shielding layer is sandwiched between the color filter substrate and the color filter film, and the electromagnetic shielding layer completely covers the liquid crystal layer.

4. The liquid crystal display screen according to claim 3, characterized in that, Also includes: First conductive element; The first conductive element is electrically connected to the grounding circuit of the circuit board and the electromagnetic shielding layer, respectively.

5. The liquid crystal display screen according to claim 4, characterized in that, The first conductive element at least partially includes a metal conductive filler, and the first conductive element partially covers at least one of the color filter substrate, the liquid crystal layer, the TFT array substrate, the second polarizer, and the backlight module.

6. The liquid crystal display screen according to claim 4 or 5, characterized in that, The first conductive element is made of silver paste, and the first conductive element is disposed at intervals on both sides of the color filter substrate, the liquid crystal layer, the TFT array substrate, the second polarizer and the backlight module.

7. The liquid crystal display screen according to claim 4 or 5, characterized in that, The circuit board includes: a printed circuit board assembly (PCBA), a flexible circuit board (FPC), and a metal backplate; The PCBA is electrically connected to the backlight module and the TFT array substrate via the FPC; The metal backplate covers the side of the backlight module facing away from the first polarizer, and the metal backplate also covers the first conductive element, the color filter substrate, the liquid crystal layer, the TFT array substrate, the second polarizer, and the side of the backlight module.

8. The liquid crystal display screen according to claim 7, characterized in that, The FPC is provided with multiple grounding circuits that are electrically connected to the first conductive element. The grounding circuit of the TFT array substrate, the electromagnetic shielding layer and the grounding circuit of the backlight module are short-circuited and connected to the metal backplate through the grounding circuit of the PCBA and the multiple grounding circuits.

9. The liquid crystal display screen according to any one of claims 1 to 5, characterized in that, The electromagnetic shielding layer adopts a metal mesh structure, and the metal mesh structure is made of indium tin oxide material.

10. An electronic device, characterized in that, Includes: the liquid crystal display screen according to any one of claims 1 to 9.

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