CN112596289A

CN112596289A - Design structure for electrostatic protection of code-breaking display screen

Info

Publication number: CN112596289A
Application number: CN202110034759.1A
Authority: CN
Inventors: 孙凯瑾; 李华; 余胜秋
Original assignee: Xinyang Rongle Shanghai Automotive Electronics Co ltd
Current assignee: Xinyang Rongle Shanghai Automotive Electronics Co ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-04-02
Anticipated expiration: 2041-01-12
Also published as: CN112596289B

Abstract

The invention discloses a design structure for electrostatic protection of a broken code display screen, which includes a conductive film on ITO glass, an anti-static shielding wiring, an FPC cable, a discharge TVS tube, a silver paste point and a conductive Mylar. The upper ITO glass is double-sided conductive ITO glass, the top surface of the upper ITO glass is covered with a layer of ITO conductive film, the upper surface of the upper ITO glass is designed with a common electrode COM‑ITO line, and the surface of the lower ITO glass is designed with a working pattern Corresponding pen segment SEG-ITO wiring, the lower surface of the upper ITO glass and the pattern on the upper surface of the lower ITO glass are in one-to-one correspondence, the surface of the lower ITO glass is the ITO pattern wiring, and the upper surface of the ITO glass is pasted with a layer the ITO conductive film. The invention utilizes the shielding grounding to maintain the synchronization signal with the driving wiring on the surface, without phase difference, the working display pattern has no potential difference, cannot build an electric field by itself, and the liquid crystal molecules cannot be deflected; when static electricity is generated on the ITO film, the electrostatic charge It can be quickly drained, and there will be no residual charge on the display surface.

Description

Design structure for electrostatic protection of code-breaking display screen

Technical Field

The invention belongs to the technical field of information display, and particularly relates to a design structure for electrostatic protection of a code-breaking display screen.

Background

The code breaking screen is widely applied to display equipment at present, is particularly easily influenced by static electricity to cause abnormal display in the actual use process, particularly, the code breaking liquid crystal screen with a larger size is a display equipment with high cost performance when the current new energy automobile is updated, is cheaper than a full liquid crystal screen by half or more, and is gradually touted by various instrument manufacturers. However, static electricity accumulation is easily caused when the code breaking ITO design static electricity protection is not standard, especially in the area with rich ITO layout and wiring requirements at the display pen end, the distance between the wiring is very small, and abnormal phenomena such as large-area whitening and the like are easily caused when the shielding wire and the ITO wiring are not standard; therefore, many manufacturers are particularly careful in designing large dimensions.

In a general design liquid crystal box in the market, a shielding loop is designed into a loop with a tip, and electrostatic charges are released into the air through tip discharge; or triangular blocks are designed at four corners of the ITO glass, and sharp triangles on the shielding loop line are released onto the triangular blocks at the four corners and then released into the air. The blank area between the COM-ITO routing layer and the SE-ITO routing layer in the liquid crystal box is used for designing and filling a triangular block or a square block, and even the situation that the existence of a self-established induction electric field in the liquid crystal box cannot be solved, carriers are accumulated continuously. Therefore, the problem of the white emission caused by the accumulation of static charges in the dense display area cannot be solved completely.

At present, the liquid crystal display technology that the upper ITO glass is made into a double-sided ITO mould, the upper surface of the upper ITO glass is plated with an ITO conductive film, and the whole ITO is adopted for shielding is adopted, but a leakage path of the whole conductive film is directly grounded, so that the problem of static accumulation cannot be solved, EMC testing NG can be caused, and serious quality problems exist.

It is to be noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Disclosure of Invention

In order to solve the problems in the prior art, the invention is provided with the protection structure capable of rapidly discharging static electricity and inhibiting static electricity accumulation, so that static electricity interference can be solved, the influence of the static electricity on display pattern information is avoided, and the screen splash phenomenon caused by charge accumulation formed by the movement of current carriers in liquid crystal glass is solved.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a disconnected sign indicating number display screen electrostatic protection's project organization, includes ITO glass's conducting film, prevents that the electrostatic shield is walked the line, the FPC winding displacement, the TVS pipe of releasing, silver thick liquid point and electrically conductive Mylar. The upper ITO glass is double-sided conductive ITO glass, a layer of ITO conductive film covers the top surface of the upper ITO glass, common electrode COM-ITO pen segment wiring is designed on the upper surface of the upper ITO glass, SEG-ITO wiring with working patterns corresponding to pen segments is designed on the surface of the lower ITO glass, the lower surface of the upper ITO glass corresponds to the patterns on the upper surface of the lower ITO glass one by one, ITO pattern wiring is arranged on the surface of the lower ITO glass, and a layer of ITO conductive film is adhered to the upper surface of the ITO glass.

On the basis of the technical scheme, the surface of the inner layer of the upper ITO glass is provided with a COM electrode of film wiring, the lower ITO glass corresponding to the COM electrode is single-sided ITO glass, and the upper surface of the upper ITO glass is provided with an SEG electrode of film wiring.

On the basis of the technical scheme, the lower surface edge of the upper ITO glass is provided with a film shielding routing for a discharge routing, the discharge routing is distributed around the edge of the ITO glass for a circle to form a U-shaped loop line, the discharge routing is overlapped with a shielding grounding routing corresponding to the lower ITO glass, the discharge routing is also distributed on the upper surface of the lower ITO glass and is also distributed on the edge of the ITO glass, and the discharge routing is far away from the film routing of SEG-ITO and keeps a certain film routing distance with the COM-ITO routing.

On the basis of the technical scheme, the bleeder TVS tube is a TVS tube with a transient bleeder function.

On the basis of the technical scheme, the FPC winding displacement (110) binding is adhered to the lower ITO glass (105), and transmission paths for electrostatic discharge are distributed in the distribution of the pins of the golden fingers of the FPC, namely the 1 st golden finger and the last golden finger.

On the basis of the technical scheme, the ITO conductive films at the left and right lower corners of the upper ITO glass are in short circuit with the shielding routing wires in a silver paste dispensing mode, and the lower ITO glass is pasted with conductive Mylar, wherein the thickness of the conductive Mylar is 0.1 mm.

On the basis of the technical scheme, the size of the screen display is 10.25 inches, and the size of the ITO conductive film can be changed according to design requirements.

On the basis of the technical scheme, the screen display size is 10.25 inches, other relatively larger sizes are commonly used, and the size of the ITO conductive film is changed according to design requirements.

Compared with the prior art, the invention has the beneficial effects that:

1. the EMC radiation is inhibited, and the anti-radiation and anti-static interference capability of the equipment is improved;

2. the abnormal phenomenon that the non-working display pen section is whitened due to the deflection of liquid crystal molecules caused by bias voltage caused by static accumulation is solved;

3. the phenomenon of disordered display patterns caused by electrostatic discharge is solved;

4. the display screen phenomenon caused in the operation processes of film tearing, film sticking and the like is solved;

5. the process design and the production manufacturing technology are mature, no technical barrier is realized, the operation is convenient, and the mass production can be realized.

Additional features of the invention and advantages thereof will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a schematic view of the technical structure of the present invention.

Fig. 2 is a schematic diagram of the structure inside the code breaking screen of the present invention.

Fig. 3 is a graph showing the bias levels of the electrodes of the working display pattern during normal operation of the present invention.

Fig. 4 shows the working level of the shield grounding of the shield loop wire when the invention is electrified.

The reference numerals are explained below:

100. an electrostatic adsorption film; 101. ITO glass is coated; 102. an electrode pen section; 103. the ITO electrostatic ring is grounded; 104. a driving chip; 105. lower ITO glass; 107. polarizing glass; 108. an ITO conductive film; 109. a TVS discharge pipe; 110. FPC cable arrangement; 112. PCBA mainboard; 113. liquid crystal molecules LC.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Examples

Referring to fig. 1-4, the present invention provides a design structure of electrostatic protection for a code-breaking display screen: the anti-static display device comprises an anti-static adsorption film 100, polarized glass 107, upper ITO glass 101 and lower ITO glass 105, wherein the top layer surface of the upper ITO glass covers a whole ITO conductive film 108, an ITO electrostatic ring shielding grounding 103 is designed on the edge of the lower surface of the upper ITO glass, liquid crystal molecules LC 113, inner film wires of the upper ITO glass and the lower ITO glass correspond to a working display electrode pen section 102, the working electrode wires are divided into SEG-electrodes which are distributed on the lower ITO glass, COM-ITO electrodes are distributed on the lower surface of the upper ITO glass, the SEG and the COM electrode wires are both output by a driving chip 104, an ITO anti-static shielding ring line 103 is designed on the edge of the top layer surface of the lower ITO glass, and silver pastes of the conductive films on the upper ITO glass are in short circuit at the bottoms of the left lower corner and the; the electrostatic ITO loop shield 103 is connected to the PCBA motherboard 112 via the FPC cable 110 and to the main ground via the string TVS discharge tube 109.

On the basis of the above-described embodiment: under the condition that a pattern with rich information needs to be displayed, the number of electrodes SEG output by one IC control is limited, and in order to realize a pattern with richer work display, more driving ICs are needed for control, as shown in fig. 1, 2 driving ICs provided by the scheme output more SEG and COM control lines to drive and realize more and richer work display information.

The model of the driving IC is SC5037, 1/1Duty, the bias voltage is 1/2, the driving voltage is 5V, the driving frequency is 130Hz, the refreshing frequency is 60Hz, in order to improve the bias driving capability, the COM1, the COM2, the COM3 and the COM4 are all in short circuit, the VCC power supply voltage of the driving IC is 3.3V, the electrodes of the broken code liquid crystal LCD working display pen segment can only be added with AC voltage, and a built-in driving circuit in the driving IC can output and control the working display pen segment corresponding to COM and SEG;

in normal operation, COM and SEG output alternating levels with fixed periods, namely COM is V + or 0V, SEG is V-and 0V, and electrode SEG and COM levels are the same.

In any working period, the bias voltage of the SEG and COM electrodes which are not selected is 0V, no self-established electric field is formed, LC corresponding to the ITO electrodes does not deflect, no backlight penetrates, and no working pattern is displayed.

When COM and SEG voltages are in different directions, the alternating voltage of the selected working electrode is 2V, the upper ITO glass and the lower ITO glass are similar to capacitance plates, the upper electrode plate and the lower electrode plate form a self-established electric field, after the corresponding electrodes are selected, the self-established electric field formed by constant voltage difference guides the liquid crystal molecules LC 113 to generate directional deflection, and the displayed working pattern can be seen after backlight light penetrates through the self-established electric field.

When tearing the adsorption film, like electrostatic adsorption film 100 of fig. 2, after protection film and polarizer separation, different electric charges all took with polarisation glass on the adsorption film, on the static electric charge on the polarizer can pass through the quick transfer release PCBA of conducting film on the ITO, ITO glass can not have the interelectrode voltage difference from top to bottom, and the liquid crystal molecule can not rotate, can be in order to avoid the electrostatic influence that the dyestripping brought.

When static electricity is subjected to emergency discharge on the adsorption film, the static electricity on the upper surface of the ITO can be rapidly released as the same condition exists; although the upper and lower ITO glass is fixed by the frame glue, a phenomenon that certain charge residue is released into the liquid crystal box exists, ITO anti-static shielding loop wires are designed on the upper and lower edges in the ITO liquid crystal box; meanwhile, when the module is designed, a stainless steel iron frame or a black conductive cloth adhesive tape with shielding and static electricity resistance is wrapped by a circle along the upper ITO glass side edge and the lower ITO glass side edge, so that the phenomenon of side static charge infiltration can be solved, and the method belongs to the general method for static electricity prevention protection outside the liquid crystal display module in the industry.

The electrostatic shielding loop line, the COM layer and the ITO wiring of the SEG layer are all provided, the width of the film wiring of the shielding loop line is 0.3mm or more, the distance from an electrode of the SEG layer is 0.5mm or more, and the wiring distance from the COM layer is 0.1 mm; the distance is limited by the distribution of the display electrodes on the ITO layer and the wiring of SEG (lead-out glass) and COM (component interconnect) routing of the corresponding electrodes, and enough space needs to be reserved during design optimization; the electrostatic shielding loop line is influenced by the coupling of COM alternating levels, the driving capability of COM wiring is strong, and the same levels can exist on the electrostatic shielding loop line.

When the accumulation of external charges or carriers in the liquid crystal box is more, particularly in the area where the SEG electrode layer wiring area corresponds to the COM electrode layer wiring-free area, the SEG electrode accumulates certain charges, bias voltage exists relative to the COM layer, the local bias voltage is formed along with the continuous accumulation of the carriers in the direct current voltage attraction box for a long time, and the liquid crystal molecules LC in the corresponding area are deflected due to the induction of the internal electric field, so that no practical working pattern appears whitish, namely, the phenomenon of screen blooming is caused.

When the upper ITO glass 101 uses a whole ITO film, the ground is connected to the main ground of the PCBA main board 112 through the bidirectional TVS tube 109, the distance between the ground and the COM layer wiring is very close to 0.1mm, the shielding ground loop has the same level with the same period under the action of distributed capacitance and coupling, the shielding ground loop is communicated with the upper ITO conductive film 108, namely a certain bias voltage exists, even if the SEG layer wiring corresponds to a COM layer wiring-free electrode, the SEG electrode wiring is opposite to the ITO wiring bias voltage at the COM layer electrode-free position, the bias voltage between two electrode plates of the opposite ITO conductive film 108 layer is basically counteracted, a constant induction electric field cannot be formed, namely liquid crystal molecules cannot deflect, and the phenomenon of whitening of a screen caused by charge accumulation cannot occur.

A large number of electrode wires are arranged at the leading-out position of the SEG layer driving chip, the part corresponding to the COM layer is not provided with wires, and if the electric field is not counteracted by the upper ITO film and the SEG layer, the non-working pattern whitening phenomenon of the part of the non-working pattern electrodes can be caused.

The model of the bidirectional leakage TVS tube 109 is SMDA05CCN, the reverse working VRWM voltage is 5V, the minimum breakdown voltage VBR is 6V, namely when the phenomena of film tearing or electrostatic contact discharge and the like exist, when the voltage on a loop line exceeds the breakdown voltage VBR-6V, the TVS tube acts, and is conducted to the ground to form a leakage path, so that the static electricity is released.

The working principle and the using process of the invention are as follows: through the pasting of the upper ITO glass and a layer of anti-static ITO film, four corners of the ITO film are in short circuit with the annular electrostatic shielding wire of the lower ITO glass 105, the electrostatic shielding wire is connected to the end of a PCBA mainboard 112 through an FPC (flexible printed circuit board) flat cable 110 and is discharged to a main ground with the lowest system potential through a TVS (transient voltage suppressor) discharge tube 109; the shielding grounding is utilized to keep synchronous signals with the driving wiring on the surface, no phase difference exists, no potential difference exists in working display patterns, no electric field can be built by itself, liquid crystal molecules cannot deflect, and abnormal phenomena such as light transmission and whitening do not occur; since the whole ITO film has conductivity, when static electricity is generated on the ITO film, the static charge can be dredged quickly, and residual charge on the display surface can be avoided.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A design structure for electrostatic protection of broken code display screen, including conductive film (101) on ITO glass, anti-static shielding wiring, FPC cable (110), discharge TVS tube (109), silver paste point and Conductive Mylar, characterized in that: the upper ITO glass (101) is double-sided conductive ITO glass, the top surface of the upper ITO glass (101) is covered with a layer of the ITO conductive film (108), and the upper ITO glass (108) The upper surface of (101) is designed with a common electrode COM-ITO pen segment trace, the surface of the lower ITO glass (105) is designed with SEG-ITO traces with a working pattern corresponding to the pen segment, and the upper ITO glass (105) The lower surface is in one-to-one correspondence with the patterns on the upper surface of the lower ITO glass (101), the surface of the lower ITO glass (105) is an ITO pattern trace, and a layer of the ITO conductive film is pasted on the upper surface of the ITO glass (108).

2. A design structure for electrostatic protection of a broken code display screen according to claim 1, characterized in that: the inner surface of the upper ITO glass (101) is the COM electrode of the film wiring, corresponding to the lower ITO The glass (105) is a single-sided ITO glass, and the upper surface is a SEG electrode with a film trace.

3. A design structure for electrostatic protection of a broken code display screen according to claim 1, characterized in that: the edge of the lower surface of the upper ITO glass (101) is provided with a film shielding wiring, which is a discharge wiring, The relief wiring is distributed around the edge of the ITO glass to form a "U"-shaped loop, and the relief wiring overlaps with the shielding ground wiring corresponding to the lower ITO glass (105). The release line is also on the upper surface of the lower ITO glass (105), which is also distributed on the edge of the ITO glass, and is far away from the SEG-ITO film line and maintains a certain film line distance from the COM-ITO line.

4. A design structure for electrostatic protection of a broken code display screen according to claim 1, characterized in that: the FPC cable (110) is bonded to the lower ITO glass (105) by bonding (bonding process). Above, in the gold finger pin distribution of the FPC, that is, the first gold finger and the last gold finger are distributed with transmission paths for electrostatic discharge.

5 . The design structure for electrostatic protection of a broken code display screen according to claim 1 , wherein the discharge TVS tube ( 109 ) is a TVS tube with a transient discharge function. 6 .

6. A design structure for electrostatic protection of a broken code display screen according to claim 1, characterized in that: the ITO conductive film (108) at the left and right lower corners of the upper ITO glass (101) and the lower The ITO glass (105) is short-circuited with the shielding traces by means of silver paste, and is pasted with conductive Mylar, and the thickness of the conductive Mylar is 0.1mm.

7. A design structure for electrostatic protection of a broken code display screen according to claim 1, characterized in that: the screen display size is 10.25 inches, and the size of the ITO conductive film (108) can be changed according to design requirements.