LCD (Liquid Crystal Display) module with enhanced antistatic performance

Abstract

The utility model relates to an LCD (Liquid Crystal Display) module with enhanced antistatic performance. The LCD module comprises a display screen, a driving chip, a PCB (Printed Circuit Board), an iron frame, a conductive zebra strip and a PE (Poly Ethylene) foam cushion, the driving chip is a chip which is high in anti-static performance and provided with a protection circuit at a port, and the power supply port of the PCB is connected with a TVS diode in series. And the iron frame is made of a galvanized material or a stainless iron material, and is reliably grounded with the PCB through a conductive zebra strip. The distance between the display screen pin electrode and the iron frame at the fixed pin screwing position is larger than 0.5 mm, and a PE foam cushion is arranged between the display screen and the iron frame. Through the design, the anti-static performance of the module is effectively improved, display interference or damage caused by static invasion is prevented, and the display module has the advantages of being simple in structure and reliable in performance.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid crystal display modules, and in particular to an LCD liquid crystal display module with enhanced anti-static properties. Background Technology

[0002] The main components of a display module include resistors, capacitors, TVS diodes, a driver IC, conductive connectors, the display screen, and a mounting frame. Typically, the display screen is determined by the content to be displayed, a dedicated driver IC is selected, and external components are chosen based on this driver IC. A TVS diode is added to the power supply of the driver chip to prevent damage to the driver chip from static electricity. These components are assembled on a PCB to form what we commonly call a COB (Chip-on-Board). The display screen is then placed in the mounting frame, conductive zebra strips are added, the COB is covered, the COB is pressed down, and the frame feet are tightened to secure it.

[0003] LCD modules are widely used in various electronic devices, and static electricity (SES) is a common problem associated with them. However, the anti-SES performance of existing LCD modules is generally not ideal. The presence of SES has a significant impact on the quality of LCD modules. For example, SES can easily travel through the edges of the LCD module to the inside, interfering with the display effect and, in severe cases, causing the display to malfunction. Therefore, SES is a crucial factor to consider during the manufacturing process of LCD modules.

[0004] In view of this, the inventors specifically designed an LCD liquid crystal display module with enhanced antistatic properties, which led to this invention. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The purpose of this application is to provide an LCD display module with enhanced anti-static properties, which at least solves the problem of display interference or screen failure caused by electrostatic intrusion during the use of the LCD display module.

[0007] (II) Technical Solution

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0009] This application provides an LCD liquid crystal display module with enhanced antistatic properties, comprising:

[0010] Display screen;

[0011] A driver chip, wherein the port of the driver chip is provided with a protection circuit;

[0012] A PCB circuit board, wherein the driver chip is mounted on the PCB circuit board, and a TVS diode is connected in series at the power supply port of the PCB circuit board;

[0013] The iron frame is electrically connected to the PCB circuit board via conductive zebra strips.

[0014] A conductive zebra strip is disposed between the display screen and the PCB circuit board for reliable grounding connection between the iron frame and the PCB circuit board;

[0015] A PE foam pad is placed between the display screen and the iron frame to isolate and buffer static electricity;

[0016] The distance between the pin electrode of the display screen and the iron frame at the fixed screw position is H, and H is greater than 0.5mm.

[0017] In a further embodiment, the electrostatic discharge (ESD) level of the driver chip meets the HBM (Human Body Model) standard of greater than or equal to 4000V.

[0018] In a further embodiment, the TVS diode is a bidirectional TVS diode with a rated reverse breakdown voltage between 5V and 12V.

[0019] In a further embodiment, the iron frame is a galvanized iron frame.

[0020] In a further embodiment, the conductive zebra strip is made of a carbon-based conductive material.

[0021] In a further embodiment, the thickness of the PE foam pad is 0.2 mm to 0.5 mm.

[0022] In a further embodiment, an anti-static protective coating is provided on the PCB circuit board in the area near the pin electrodes.

[0023] In a further embodiment, the display screen is an ITO electrode liquid crystal screen, and the surface resistance of the ITO electrode is greater than 50 ohms per square meter.

[0024] In a further embodiment, the iron frame is elastically pressed onto the PCB circuit board via the conductive zebra strip.

[0025] In a further embodiment, conductive foam is provided between the iron frame and the PCB circuit board to further enhance the grounding conductivity.

[0026] (III) Beneficial Effects

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] By employing a driver chip with higher anti-static performance and port protection circuits in the LCD module, connecting a TVS diode in series at the PCB power supply port, using a galvanized or stainless steel frame and achieving reliable grounding connection through conductive zebra strips, setting PE foam pads for physical isolation, and maintaining a safe distance of more than 0.5 mm between the pin electrodes and the frame, a comprehensive anti-static system combining circuit protection, structural optimization, and material selection is constructed. This effectively prevents static electricity from intruding along the module edge and interfering with or damaging the driver chip and display screen, significantly improving the anti-static capability and reliability of the LCD module. It is particularly suitable for static-sensitive application environments and has a simple structure and low manufacturing cost.

[0029] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0030] in:

[0031] Figure 1 This is a partial sectional view of the overall structure of this utility model, highlighting the distribution and connection of each structure;

[0032] Figure 2 This is a block diagram illustrating the protection principle of this utility model;

[0033] Figure 3 This is a protection circuit diagram for the driver chip of this utility model;

[0034] Figure 4 This utility model highlights the spacing between the pin electrodes of the display screen and the iron frame;

[0035] Figure 5 This utility model describes the relative positions of the TVS diodes.

[0036] Label Explanation:

[0037] 1. Display screen; 2. Driver chip; 21. Protection circuit; 3. PCB circuit board; 4. Iron frame; 5. Conductive zebra strip; 6. PE foam pad; 7. TVS diode. Detailed Implementation

[0038] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0039] This utility model relates to an LCD liquid crystal display module with enhanced anti-static properties, which is particularly suitable for display devices working in high electrostatic risk environments, so as to effectively improve the anti-static capability of the module and prevent display abnormalities or module damage caused by electrostatic discharge (ESD).

[0040] like Figure 1 As shown, the LCD display module with enhanced antistatic properties includes a display screen, a driver chip, a PCB circuit board, an iron frame, conductive zebra strips, and a PE foam pad.

[0041] The display screen uses an ITO electrode liquid crystal panel with a high surface resistivity, preferably greater than 50 ohms per square meter, which can reduce the energy of static electricity conduction to the driver chip to a certain extent. By rationally selecting liquid crystal materials, the risk of static electricity intrusion is reduced from the source.

[0042] like Figure 3 As shown, the driver chip is preferably a chip with a high anti-static rating, such as a chip that meets the anti-static requirements of 4000V and above under the HBM (Human Body Model) standard, and its port integrates an electrostatic protection circuit, which further enhances the module's anti-static performance.

[0043] like Figure 1 , Figure 2 and Figure 5 As shown, to prevent the power port from becoming a channel for electrostatic discharge, a TVS (Transient Voltage Suppressor) diode is connected in series on the power supply port of the PCB circuit board. A bidirectional TVS device is preferred, with an operating voltage range of 5V to 12V. It can quickly conduct when an electrostatic shock occurs, discharging the electrostatic current to ground, thereby protecting the internal circuit.

[0044] In terms of module structure, the iron frame is made of galvanized iron or stainless iron, which provides better conductivity and static discharge compared to traditional spray-coated insulating iron frames. The iron frame forms a reliable electrical connection with the PCB circuit board through conductive zebra strips placed between the display screen and the PCB circuit board, eliminating the need for soldering and utilizing the elasticity of the zebra strips to achieve reliable grounding.

[0045] like Figure 4 As shown, in terms of layout, the pin electrodes of the display screen maintain a safe distance H from the iron frame at the fixed screw position. H is preferably greater than 0.5 mm to avoid local electrostatic discharge caused by too small a distance.

[0046] In addition, a PE foam pad is placed between the display screen and the iron frame. This foam pad has good insulation and cushioning properties, which can further isolate the contact between the display screen and the iron frame in terms of physical structure, preventing electrostatic discharge problems caused by changes in spacing due to mechanical vibration, external impact, etc. The preferred thickness of the PE foam pad is 0.2 mm to 0.5 mm to balance the isolation effect and the structural compactness.

[0047] In a preferred embodiment, conductive foam can be added between the iron frame and the PCB circuit board to further enhance the reliability of the grounding connection and improve the overall antistatic performance. However, this measure is an optional improvement and is not necessary in the basic protection scheme.

[0048] Through the above design, the LCD liquid crystal display module with enhanced antistatic performance of this utility model can form a comprehensive antistatic system integrating circuit protection, structural isolation and material selection, effectively suppressing the damage of external static electricity to the internal circuit of the module, significantly improving the working stability and service life of the module, and is particularly suitable for high static electricity sensitive application scenarios such as medical, industrial control, and outdoor advertising.

[0049] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An LCD liquid crystal display module with enhanced antistatic properties, characterized in that, include: Display screen (1); The driver chip (2) has a protection circuit (21) at its port. PCB circuit board (3), the driving chip (2) is mounted on the PCB circuit board (3), and the power supply port of the PCB circuit board (3) is connected in series with a TVS diode (7). The iron frame (4) is electrically connected to the PCB circuit board (3) via a conductive zebra strip (5); A conductive zebra strip (5) is disposed between the display screen (1) and the PCB circuit board (3) for reliable grounding connection between the iron frame (4) and the PCB circuit board (3); A PE foam pad (6) is placed between the display screen (1) and the iron frame (4) to isolate and buffer static electricity; The distance between the pin electrode of the display screen (1) and the iron frame (4) at the fixed screw position is H, and H is greater than 0.5mm.

2. The LCD liquid crystal display module with enhanced antistatic properties according to claim 1, characterized in that, The electrostatic discharge (ESD) level of the driver chip (2) meets the standard of ≥4000V under the HBM (Human Body Model) standard.

3. An LCD liquid crystal display module with enhanced antistatic properties according to claim 1, characterized in that, The TVS diode (7) is a bidirectional TVS diode (7) with a rated reverse breakdown voltage between 5V and 12V.

4. An LCD liquid crystal display module with enhanced antistatic properties according to claim 1, characterized in that, The iron frame (4) is a galvanized iron frame.

5. An LCD liquid crystal display module with enhanced antistatic properties according to claim 1, characterized in that, The conductive zebra strip (5) is made of carbon-based conductive material.

6. An LCD liquid crystal display module with enhanced antistatic properties according to claim 1, characterized in that, The thickness of the PE foam pad (6) is 0.2 mm to 0.5 mm.

7. An LCD liquid crystal display module with enhanced antistatic properties according to claim 1, characterized in that, An antistatic protective coating is provided on the PCB circuit board (3) in the area near the pin electrodes.

8. An LCD liquid crystal display module with enhanced antistatic properties according to claim 1, characterized in that, The display screen (1) is an ITO electrode liquid crystal screen, and the surface resistance of the ITO electrode is greater than 50 ohms per square meter.

9. An LCD liquid crystal display module with enhanced antistatic properties according to claim 1, characterized in that, The iron frame (4) is elastically pressed onto the PCB circuit board (3) by the conductive zebra strip (5).

10. An LCD liquid crystal display module with enhanced antistatic properties according to claim 1, characterized in that, Conductive foam is provided between the iron frame (4) and the PCB circuit board (3) to further enhance the grounding conductivity.

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