# US 2014/0192444 A1 · Electro-Static Discharge Protection Circuit, Array Substrate And Display Apparatus

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- Number: US 2014/0192444 A1
- Document ID: US20140192444A1
- Status: Published application
- Kind: A1
- Application number: 13/995,134
- Filed: 2012-11-21
- Published: 2014-07-10
- Earliest claimed: 2012-06-21
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: BOE Technology Group Co., Ltd.
- Inventors: Zhongyuan Wu; Liye Duan
- Web page: https://patentgrep.com/patent/US20140192444A1

## CPC

- H02H 9/04: responsive to excess voltage (lightning arrestors H01C7/12, H01C8/04, H01G9/18, H01T)
- G02F 1/136204: {Arrangements to prevent high voltage or static electricity failures}
- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- H02H 3/046: {Signalling the blowing of a fuse (detecting non functioning of a lamp H05B47/20)}
- H10D 89/931: {characterised by the dispositions of the protective arrangements}
- G09G 2330/04: Display protection
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES

## Abstract

Provided is an electro-static discharge protection circuit, an array substrate and a display apparatus, being capable of reducing power consumption while improving reliability of the display apparatus. The electro-static discharging protection circuit comprises: a first thin film transistor (T1), having a drain connected to a high level output terminal (VGH); a second thin film transistor (T2), having a source connected to a source of the first thin film transistor (T1) as a discharging terminal (O), a drain connected to the high level output terminal (VGH) and a gate connected to a low level output terminal (VGL); a third thin film transistor (T3), having a source and a gate connected to the low level output terminal (VGL) and a drain connected to the gate of the first thin film transistor (T1); and a voltage difference maintaining unit connected between the gate of the first thin film transistor (T1) and the discharging terminal (O), wherein the voltage difference maintaining unit is used to make the voltage difference between the gate of the first thin film transistor (T1) and the discharging terminal (O) maintain unchanged, the discharging terminal (O) being used for connecting gate lines or data lines.

## Claims

### Claim 1

An electro-static discharging protection circuit comprising:
a first thin film transistor, having a drain connected to a high level output terminal;
a second thin film transistor, having a source connected to a source of the first thin film transistor as a discharging terminal, a drain connected to the high level output terminal and a gate connected to a low level output terminal;
a third thin film transistor, having a source and a gate connected to the low level output terminal and a drain connected to the gate of the first thin film transistor; and
a voltage difference maintaining unit connected between the gate of the first thin film transistor and the discharging terminal, wherein the voltage difference maintaining unit is used to make the voltage difference between the gate of the first thin film transistor and the discharging terminal maintain unchanged, the discharging terminal being used for connecting gate lines or data lines.

### Claim 2 (depends on 1)

The electro-static discharging protection circuit of claim 1, wherein the voltage difference maintaining unit is a capacitor.

### Claim 3 (depends on 1)

The electro-static discharging protection circuit of claim 1, wherein the voltage difference maintaining unit is a fourth thin film transistor, having a source connected to a drain thereof and the gate of the first thin film transistor, and a gate connected to the discharging terminal.

### Claim 4

An array substrate comprising:
a plurality of gate lines and data lines; and
a plurality of electro-static discharging protection circuits, comprising:
a first thin film transistor, having a drain connected to a high level output terminal;
a second thin film transistor, having a source connected to the source of the first thin film transistor as a discharging terminal, a drain connected to the high level output terminal and a gate connected to a low level output terminal;
a third thin film transistor, having a source and a gate connected to the low level output terminal and a drain connected to the gate of the first thin film transistor; and
a voltage difference maintaining unit connected between the gate of the first thin film transistor and the discharging terminal, wherein the voltage difference maintaining unit is used to cause the voltage difference between the gate of the first thin film transistor and the discharging terminal maintain unchanged, the discharging terminal being used for connecting gate lines or data lines,
wherein each gate line and/or each data line is connected to the discharging terminal of one of the electro-static discharging circuits.

### Claim 5

A display apparatus comprising: an array substrate, the array substrate comprises:
a plurality of gate lines and data lines; and
a plurality of electro-static discharging protection circuits comprising:
a first thin film transistor, having a drain connected to a high level output terminal;
a second thin film transistor, having a source connected to the source of the first thin film transistor as a discharging terminal, a drain connected to the high level output terminal and a gate connected to a low level output terminal;
a third thin film transistor, having a source and a gate connected to the low level output terminal and a drain connected to the gate of the first thin film transistor; and
a voltage difference maintaining unit connected between the gate of the first thin film transistor and the discharging terminal, wherein the voltage difference maintaining unit is used to cause the voltage difference between the gate of the first thin film transistor and the discharging terminal maintain unchanged, the discharging terminal being used for connecting gate lines or data lines,
wherein each gate line and/or each data line is connected to the discharging terminal of one of the electro-static discharging circuits.

### Claim 6 (depends on 4)

The array substrate of claim 4, wherein the voltage difference maintaining unit is a capacitor.

### Claim 7 (depends on 4)

The array substrate of claim 4, wherein the voltage difference maintaining unit is a fourth thin film transistor, having a source connected to a drain thereof and the gate of the first thin film transistor, and a gate connected to the discharging terminal.