Electrostatic shielding structure for liquid crystal displays

Abstract

The present invention discloses an electrostatic shielding structure for a liquid crystal display (LCD), comprising a transparent conductive film coated on the front side of a conductive glass substrate of the LCD; the transparent conductive film is connected to a common reference ground of a circuit board of the LCD via a grounding lead. The LCD electrostatic shielding structure of the present invention coats the front side of the conductive glass substrate of the LCD with the transparent conductive film. The transparent conductor's electric field shielding effect shields the electrostatic field generated by static charges on the display surface, thereby protecting the liquid crystal layer of the LCD from the effects of the electrostatic field. This allows the LCD to function normally in environments with sustained high electrostatic voltages without sacrificing optical performance or electrical reliability, while maintaining a flexible mechanical design.

Description

Technical Field

[0001] The present invention relates to a liquid crystal display, and in particular to an electrostatic shielding structure of a liquid crystal display. Background Art

[0002] When using a liquid crystal display (LCD), there may be an environment where the surface has a continuous high static voltage. The surface of an LCD is generally made of an insulating film, and ordinary static discharge methods cannot quickly release static electricity. Especially in a dry environment (humidity below 30%), static electricity can remain on the display surface for a long time. The static electric field penetrates the LCD and acts on the liquid crystal molecules, causing the liquid crystal molecules in the non-display area and the non-lit area to align with the direction of the electric field, resulting in abnormal lighting. At the same time, the static electric field is superimposed on the driving electric field of the LCD itself, causing the display in the lit area to change color. For existing common LCDs, the glass thickness is 0.7mm. When the glass surface has 3kV, the static electric field strength that penetrates the liquid crystal layer exceeds the lighting threshold of the liquid crystal, and the display image appears in the non-display area.

[0003] To solve the problem of abnormal display of liquid crystal displays caused by static electricity, the main methods currently adopted by the industry are: (1) static electricity release structure; (2) liquid crystal doped with antistatic agents.

[0004] An ESD structure requires grounding around the display to prevent electrical shock. If the product lacks grounding, or if the internal DC power supply is not isolated from the mains, the ESD structure cannot be implemented. Furthermore, the ESD structure's protection area is limited, making it ineffective for larger displays. Furthermore, ESD structures are not suitable for products with high aesthetic requirements.

[0005] Doping liquid crystals with antistatic agents can release static voltage on the display's internal plates, but it cannot eliminate the effects of static fields caused by external static electricity. While static dopants can increase the dielectric constant of the liquid crystal, boosting the drive voltage and reducing the impact of external static fields, they also increase power consumption and the reliability requirements for the drive circuit. Furthermore, doping liquid crystals with antistatic agents can degrade the frequency characteristics of the LCD and increase the concentration of impurity ions, significantly degrading display crosstalk and image sticking. Adding antistatic agents to liquid crystals only increases the failure static voltage from 3kV to 4kV, insufficient to withstand the static electricity environment encountered in actual use. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an electrostatic shielding structure for a liquid crystal display, so that the liquid crystal display can be used normally in a continuous high electrostatic voltage environment without sacrificing optical performance and electrical reliability, while still maintaining a flexible mechanical design structure.

[0007] In order to solve the above technical problems, the present invention provides a liquid crystal display electrostatic shielding structure, which includes a transparent conductive film 21;

[0008] The transparent conductive film 21 covers the front side of the front conductive glass substrate 11 of the liquid crystal display;

[0009] The transparent conductive film 21 is connected to the common reference ground of the LCD circuit main board 15 via the grounding lead 14 .

[0010] Preferably, the electrostatic shielding structure of the liquid crystal display further includes a front polarizer 22;

[0011] The rear side of the transparent conductive film 21 is laminated and covered on the front side of the front conductive glass substrate 11 of the liquid crystal display;

[0012] The rear side of the front polarizer 22 is laminated and covers the front side of the transparent conductive film 21 .

[0013] Preferably, the transparent conductive film 21 is formed on the front side of the front conductive glass substrate 11 of the liquid crystal display.

[0014] Preferably, the electrostatic shielding structure of the liquid crystal display further includes a front polarizer 22 and an additional transparent glass 23;

[0015] The rear side of the front polarizer 22 is laminated and covered on the front side of the front conductive glass substrate 11 of the liquid crystal display;

[0016] The rear side of the transparent conductive film 21 is laminated and covered with the front side of the front polarizer 22;

[0017] The rear side of the additional transparent glass 23 is laminated and covers the front side of the transparent conductive film 21 .

[0018] Preferably, the transparent conductive film 21 is formed on the rear side of the additional transparent glass 23 .

[0019] Preferably, the front conductive glass substrate 11 is double-sided conductive glass;

[0020] The rear side of the front conductive glass substrate 11 is formed with a liquid crystal cell inner electrode 12;

[0021] The transparent conductive film 21 covering the front side of the front conductive glass substrate 11 is in the shape of parallel lines;

[0022] The angle between the parallel lines of the transparent conductive film 21 and the inner electrode 12 of the liquid crystal cell is greater than 0° and less than 90°.

[0023] Preferably, the angle between the parallel lines of the transparent conductive film 21 and the inner electrode 12 of the liquid crystal cell is 15° to 75°.

[0024] Preferably, the transparent conductive film 21 is photoetched into dense parallel lines with a line width less than 0.2 mm and a line spacing less than 0.2 mm.

[0025] Preferably, the liquid crystal cell inner electrode 12 on the rear side of the front conductive glass substrate 11 is formed by photolithography and etching.

[0026] Preferably, the liquid crystal cell inner electrode 12 is made of the same material as the transparent conductive film 21 .

[0027] Preferably, the transparent conductive film 21 covering the front side of the front conductive glass substrate 11 is a pseudo-random porous film.

[0028] Preferably, the transparent conductive film 21 is a pseudo-random porous film formed by photolithography.

[0029] Preferably, the transparent conductive film 21 is formed by sputtering a material with high conductivity and high transmittance.

[0030] Preferably, the material with high conductivity and high transmittance is ITO.

[0031] Preferably, the ground lead 14 is connected to the transparent conductive film 21 by metal elastic contact, conductive rubber elastic contact, heteromorphic film pressing or silver paste contact;

[0032] Preferably, the circuit board 15 is a flexible circuit board.

[0033] Preferably, the liquid crystal display further includes a rear glass substrate 19;

[0034] The front side of the rear glass substrate 19 and the rear side of the front conductive glass substrate 11 are respectively formed with liquid crystal cell inner electrodes 12;

[0035] The front side of the rear glass substrate 19 and the liquid crystal cell inner electrodes 12 on the rear side of the front conductive glass substrate 11 are covered with an insulating layer;

[0036] A liquid crystal layer 18 is formed between the front side of the rear glass substrate 19 and the rear side of the front conductive glass substrate 11;

[0037] The rear side of the rear glass substrate 19 is covered with a rear polarizer 17 .

[0038] The electrostatic shielding structure for a liquid crystal display of the present invention covers the front side of the conductive glass substrate 11 of the liquid crystal display with a transparent conductive film 21. The transparent conductor utilizes the electric field shielding effect to shield the electrostatic field generated by static charges on the surface of the display. This protects the liquid crystal layer of the liquid crystal display from the effects of the electrostatic field, allowing the liquid crystal display to function normally in a continuous high electrostatic voltage environment without sacrificing optical performance and electrical reliability, while still maintaining a flexible mechanical design structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 1 is a schematic structural diagram of an embodiment of an electrostatic shielding structure for a liquid crystal display according to the present invention;

[0041] Figure 2 1 is a schematic structural diagram of another embodiment of the electrostatic shielding structure of a liquid crystal display of the present invention;

[0042] Figure 3 This is a schematic diagram of a transparent conductive film in the electrostatic shielding structure of a liquid crystal display of the present invention;

[0043] Figure 4 It is a schematic diagram of another transparent conductive film of the electrostatic shielding structure of the liquid crystal display of the present invention.

[0044] Description of reference numerals in the figures:

[0045] 21 transparent conductive film; 22 front polarizer; 23 additional transparent glass; 11 front conductive glass substrate; 12 liquid crystal cell inner electrode; 14 ground lead; 15 circuit board; 17 rear polarizer; 19 rear glass substrate; 18 liquid crystal layer. DETAILED DESCRIPTION

[0046] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0047] Example 1

[0048] like Figure 1 、 Figure 2 As shown, the electrostatic shielding structure of the liquid crystal display includes a transparent conductive film 21;

[0049] The transparent conductive film 21 covers the front side of the front conductive glass substrate 11 of the liquid crystal display;

[0050] The transparent conductive film 21 is connected to the common reference ground of the LCD circuit main board 15 via the grounding lead 14 .

[0051] The first embodiment of the electrostatic shielding structure for a liquid crystal display (LCD) comprises a transparent conductive film 21 covering the front side of the LCD's front conductive glass substrate 11. This transparent conductor shields the electrostatic field generated by static charges on the display surface, shielding the liquid crystal layer from the effects of this field. This allows the LCD to function normally in environments with sustained high electrostatic voltages without sacrificing optical performance or electrical reliability, while maintaining a flexible mechanical design. This LCD electrostatic shielding structure ensures that even when a 25kV electrostatic voltage is applied to the LCD's front surface, the displayed image remains unchanged, and neither the display's optical properties nor its electrical power consumption are affected.

[0052] Example 2

[0053] like Figure 1 As shown, based on embodiment 1, the electrostatic shielding structure of the liquid crystal display further includes a front polarizer 22;

[0054] The rear side of the transparent conductive film 21 is laminated and covered on the front side of the front conductive glass substrate 11 of the liquid crystal display;

[0055] The rear side of the front polarizer 22 is laminated and covers the front side of the transparent conductive film 21 .

[0056] Preferably, the transparent conductive film 21 is formed on the front side of the front conductive glass substrate 11 of the liquid crystal display.

[0057] In the second embodiment of the LCD electrostatic shielding structure, the transparent conductive film 21 is directly bonded to the front conductive glass substrate 11 of the LCD itself. In this LCD electrostatic shielding structure, the front conductive glass substrate 11 can be made of double-sided conductive glass. The rear side is photolithographically etched according to the normal process to form the liquid crystal cell inner layer electrode 12, while the front side is not etched. Subsequent manufacturing processes do not need to be changed. Simply add a step to the press-bonding of the flexible circuit board 15 of the LCD with the transparent conductive film 21. This press-bonding process can use anisotropic film pressing. This simplifies the manufacturing process of the LCD electrostatic shielding structure.

[0058] Example 3

[0059] like Figure 2 As shown, based on embodiment 1, the electrostatic shielding structure of the liquid crystal display further includes a front polarizer 22 and an additional transparent glass 23;

[0060] The rear side of the front polarizer 22 is laminated and covered on the front side of the front conductive glass substrate 11 of the liquid crystal display;

[0061] The rear side of the transparent conductive film 21 is laminated and covered with the front side of the front polarizer 22;

[0062] The rear side of the additional transparent glass 23 is laminated and covers the front side of the transparent conductive film 21 .

[0063] Preferably, the transparent conductive film 21 is formed on the rear side of the additional transparent glass 23 .

[0064] In the third embodiment of the electrostatic shielding structure of the liquid crystal display, the transparent conductive film 21 can be formed on the rear side of the additional transparent glass 23, so that the manufacturing process of the liquid crystal display remains unchanged. Finally, the additional transparent glass 23 with the transparent conductive film 21 is attached, and the transparent conductive film 21 is connected to the common reference ground of the circuit main board 15 of the liquid crystal display through a pressing process. The manufacturing process is simple.

[0065] Example 4

[0066] like Figure 1 As shown, based on the electrostatic shielding structure of the liquid crystal display according to embodiment 1, the front conductive glass substrate 11 is a double-sided conductive glass;

[0067] The rear side of the front conductive glass substrate 11 is formed with a liquid crystal cell inner electrode 12;

[0068] like Figure 3 As shown, the transparent conductive film 21 covering the front side of the front conductive glass substrate 11 is in the shape of parallel lines;

[0069] The angle between the parallel lines of the transparent conductive film 21 and the inner electrode 12 of the liquid crystal cell is greater than 0° and less than 90°.

[0070] Preferably, the angle between the parallel lines of the transparent conductive film 21 and the inner electrode 12 of the liquid crystal cell is 15° to 75°.

[0071] Preferably, the transparent conductive film 21 is photoetched into dense parallel lines with a line width less than 0.2 mm and a line spacing less than 0.2 mm.

[0072] Preferably, the liquid crystal cell inner electrode 12 on the rear side of the front conductive glass substrate 11 is formed by photolithography and etching.

[0073] Preferably, the liquid crystal cell inner electrode 12 is made of the same material as the transparent conductive film 21 .

[0074] In the fourth embodiment of the electrostatic shielding structure for a liquid crystal display, the transparent conductive film 21 covering the front side of the front conductive glass substrate 11 is densely packed with parallel lines and forms a certain angle with the liquid crystal cell inner-layer electrode 12 on the rear side of the front conductive glass substrate 11. This angle prevents moiré interference and reduces light reflection from the transparent conductive film 21. The transparent conductive film 21 on the front side of the liquid crystal display front conductive glass substrate 11 can be pre-etched to form parallel lines.

[0075] Example 5

[0076] Based on the electrostatic shielding structure of the liquid crystal display of embodiment 1, Figure 4 As shown, the transparent conductive film 21 covering the front side of the front conductive glass substrate 11 is a pseudo-random porous film.

[0077] Preferably, the transparent conductive film 21 is a pseudo-random porous film formed by photolithography.

[0078] In the electrostatic shielding structure of the liquid crystal display of the fifth embodiment, the transparent conductive film 21 covering the front side of the front conductive glass substrate 11 is a pseudo-random porous film, which can avoid moiré interference.

[0079] Example 6

[0080] like Figure 1 As shown, based on the electrostatic shielding structure of the liquid crystal display according to the first embodiment, the transparent conductive film 21 is formed by sputtering using a material with high conductivity and high transmittance.

[0081] Preferably, the material with high conductivity and high transmittance is ITO (indium tin oxide).

[0082] Example 7

[0083] Based on the electrostatic shielding structure of the liquid crystal display of the first embodiment, the ground lead 14 is connected to the transparent conductive film 21 by metal elastic contact, conductive rubber elastic contact, heterogeneous film pressing or silver paste contact.

[0084] Preferably, the circuit board 15 is a flexible circuit board.

[0085] Preferably, the liquid crystal display further includes a rear glass substrate 19;

[0086] The front side of the rear glass substrate 19 and the rear side of the front conductive glass substrate 11 are respectively formed with liquid crystal cell inner electrodes 12;

[0087] The front side of the rear glass substrate 19 and the liquid crystal cell inner electrodes 12 on the rear side of the front conductive glass substrate 11 are covered with an insulating layer;

[0088] A liquid crystal layer 18 is formed between the front side of the rear glass substrate 19 and the rear side of the front conductive glass substrate 11;

[0089] The rear side of the rear glass substrate 19 is covered with a rear polarizer 17 .

[0090] In the electrostatic shielding structure of the liquid crystal display of embodiment seven, the transparent conductive film 21 and the common reference ground of the circuit main board 15 of the liquid crystal display form a stable electrical connection.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electrostatic shielding structure for a liquid crystal display, characterized in that: It includes a transparent conductive film (21), a front polarizer (22) and additional transparent glass (23); The transparent conductive film (21) is connected to a common reference ground of a liquid crystal display circuit mainboard (15) via a grounding lead (14); The rear side of the front polarizer (22) is laminated and covered on the front side of the front conductive glass substrate (11) of the liquid crystal display; The rear side of the transparent conductive film (21) is laminated and covered on the front side of the front polarizer (22); The rear side of the additional transparent glass (23) is laminated and covered on the front side of the transparent conductive film (21); The front conductive glass substrate (11) is double-sided conductive glass; The rear side surface of the front conductive glass substrate (11) is formed with a liquid crystal cell inner layer electrode (12); The transparent conductive film (21) covering the front side of the front conductive glass substrate (11) is in the shape of parallel lines; The angle between the parallel line of the transparent conductive film (21) and the inner electrode (12) of the liquid crystal box is greater than 0 O and less than 90 O .

2. The electrostatic shielding structure of a liquid crystal display according to claim 1, characterized in that: The transparent conductive film (21) is formed on the rear side of the additional transparent glass (23).

3. The electrostatic shielding structure of a liquid crystal display according to claim 1, wherein: The front conductive glass substrate (11) is double-sided conductive glass.

4. The electrostatic shielding structure of a liquid crystal display according to claim 1, characterized in that: The angle between the parallel line of the transparent conductive film (21) and the inner electrode (12) of the liquid crystal cell is 15 O ~75 O .

5. The electrostatic shielding structure of a liquid crystal display according to claim 1, characterized in that: The transparent conductive film (21) is photoetched into dense parallel lines with a line width of less than 0.2 mm and a line spacing of less than 0.2 mm.

6. The electrostatic shielding structure of a liquid crystal display according to claim 1, characterized in that: The liquid crystal cell inner layer electrode (12) on the rear side of the front conductive glass substrate (11) is formed by photolithography and etching.

7. The electrostatic shielding structure of a liquid crystal display according to claim 1, characterized in that: The liquid crystal box inner electrode (12) is made of the same material as the transparent conductive film (21).

8. The electrostatic shielding structure of a liquid crystal display according to claim 1, characterized in that: The transparent conductive film (21) is formed by sputtering a material with high conductivity and high transmittance.

9. The electrostatic shielding structure of a liquid crystal display according to claim 8, characterized in that: The material with high conductivity and high transmittance is ITO.

10. The electrostatic shielding structure of a liquid crystal display according to claim 1, characterized in that: The grounding lead (14) is connected to the transparent conductive film (21) by metal elastic contact, conductive rubber elastic contact, heterogonal film pressing or silver paste contact.

11. The electrostatic shielding structure of a liquid crystal display according to claim 1, characterized in that: The circuit main board (15) is a flexible circuit main board.

12. The electrostatic shielding structure of a liquid crystal display according to claim 1, characterized in that: The liquid crystal display further includes a rear glass substrate (19); The front side surface of the rear glass substrate (19) and the rear side surface of the front conductive glass substrate (11) are respectively formed with liquid crystal cell inner layer electrodes (12); The liquid crystal cell inner layer electrodes (12) on the front side of the rear glass substrate (19) and the rear side of the front conductive glass substrate (11) are both covered with an insulating layer; A liquid crystal layer (18) is formed between the front side of the rear glass substrate (19) and the rear side of the front conductive glass substrate (11); The rear side of the rear glass substrate (19) is covered with a rear polarizer (17).

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