# US 2018/0025693 A1 · Liquid crystal driving circuit and liquid crystal display device

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- Number: US 2018/0025693 A1
- Document ID: US20180025693A1
- Status: Published application
- Kind: A1
- Application number: 15/310,100
- Filed: 2016-08-26
- Published: 2018-01-25
- Earliest claimed: 2016-07-19
- Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Inventors: Yong TIAN; Xin ZHANG
- Web page: https://patentgrep.com/patent/US20180025693A1

## CPC

- G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)}
- G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors}
- G09G 3/36: using liquid crystals
- G09G 2300/0447: for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0876: Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
- G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage
- G09G 2320/0242: Compensation of deficiencies in the appearance of colours
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- 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)

## Abstract

The present invention provides a liquid crystal driving circuit for providing power to the pixel units of a liquid crystal display device. The present invention further provides the liquid crystal display device, which comprises pixel units and the liquid crystal driving circuit.

## Claims

### Claim 1

A liquid crystal driving circuit for providing power to pixel units of a liquid crystal display device, comprising:
a first electrical switch comprising a control terminal of the first electrical switch, a first terminal of the first electrical switch, and a second terminal of the first electrical switch;
a second electrical switch comprising a control terminal of the second electrical switch, a first terminal of the second electrical switch, and a second terminal of the second electrical switch;
a third electrical switch comprising a control terminal of the third electrical switch, a first terminal of the third electrical switch, and a second terminal of the third electrical switch;
a fourth electrical switch comprising a control terminal of the fourth electrical switch, a first terminal of the fourth electrical switch, and a second terminal of the fourth electrical switch; and
a fifth electrical switch comprising a first terminal of the fifth electrical switch, and a second terminal of the fifth electrical switch;
a first capacitor comprising a first terminal of the first capacitor and a second terminal of the first capacitor;
a second capacitor comprising a first terminal of the second capacitor and a second terminal of the second capacitor;
a third capacitor comprising a first terminal of the third capacitor and a second terminal of the third capacitor; and
a fourth capacitor comprising a first terminal of the fourth capacitor and a second terminal of the fourth capacitor;
wherein the control terminal of the first electrical switch, the control terminal of the second electrical switch, and the control terminal of the third electrical switch connect with a gate terminal; the first terminal of the first capacitor and the first terminal of the second capacitor connect with the control terminal of the first electrical switch; the second terminal of the first electrical switch and first terminal of the second electrical switch connect with a data terminal, receiving a charging voltage; the first terminal of the third capacitor and the first terminal of the fourth capacitor connect with the second terminal of the second electrical switch and the first terminal of the third electrical switch; the second terminal of the first capacitor, the second terminal of the second capacitor, the second terminal of the third capacitor, the second terminal of the fourth capacitor, and the second terminal of the third electrical switch connect with a common terminal, for receiving a common voltage;
wherein the control terminal of the fourth electrical switch connects with the gate terminal, for receiving a control signal; the first terminal of the fourth electrical switch connects with the second terminal of the second electrical switch, the second terminal of the fourth electrical switch connects with the first terminal of the fifth electrical switch; the second terminal of the fifth electrical switch connects with the common terminal, for receiving the common voltage.

### Claim 2 (depends on 1)

The liquid crystal driving circuit according to claim 1, wherein upon a condition that the control signal turns on the first electrical switch, the second electrical switch, and third electrical switch, performing a discharge to the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor; a negative half cycle voltage signal of a voltage signal outputted from the data terminal turns on the fifth electrical switch, then turning on the fourth electrical switch, performing a compensation discharge to the third capacitor and the fourth capacitor via the fourth electrical switch.

### Claim 3 (depends on 2)

The liquid crystal driving circuit according to claim 2, wherein upon a condition that the negative half cycle voltage signal of the voltage signal outputted from the data terminal turns on the fifth electrical switch, the third electrical switch and the fourth electrical switch discharge voltages across the third capacitor and the fourth capacitor simultaneously.

### Claim 4 (depends on 1)

The liquid crystal driving circuit according to claim 1, wherein upon a condition that the control signal turns on the first electrical switch, the second electrical switch, and third electrical switch, performing a discharge to the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor; a positive half cycle voltage signal of a voltage signal outputted from the data terminal turns off the fifth electrical switch, then turning off the fourth electrical switch, end-performing a compensation discharge to the third capacitor and the fourth capacitor via the fourth electrical switch.

### Claim 5 (depends on 2)

The liquid crystal driving circuit according to claim 2, wherein upon a condition that the positive half cycle voltage signal of the voltage signal outputted from the data terminal turns off the fifth electrical switch, the third electrical switch, the fourth electrical switch end-perform discharges to the third capacitor and the fourth capacitor.

### Claim 6 (depends on 1)

The liquid crystal driving circuit according to claim 1, wherein the pixel unit comprises a main pixel and a sub pixel.

### Claim 7 (depends on 6)

The liquid crystal driving circuit according to claim 6, wherein the first electrical switch, the first capacitor, and the second capacitor are disposed in the main pixel.

### Claim 8 (depends on 6)

The liquid crystal driving circuit according to claim 6, wherein the second electrical switch, the third electrical switch, the fourth electrical switch, the fifth electrical switch, the third capacitor, and the fourth capacitor are disposed in the sub pixel.

### Claim 9 (depends on 1)

The liquid crystal driving circuit according to claim 1, wherein the first electrical switch, the second electrical switch, the third electrical switch, and the fourth electrical switch are transistors.

### Claim 10 (depends on 9)

The liquid crystal driving circuit according to claim 9, wherein the control terminal of the first electrical switch, the control terminal of the second electrical switch, the control terminal of the third electrical switch, the control terminal of the fourth electrical switch are gate electrodes of transistors.

### Claim 11 (depends on 9)

The liquid crystal driving circuit according to claim 9, wherein the first terminal of the first electrical switch, the first terminal of the second electrical switch, the first terminal of the third electrical switch, the first terminal of the fourth electrical switch are source electrodes of transistors.

### Claim 12 (depends on 9)

The liquid crystal driving circuit according to claim 9, wherein the second terminal of the first electrical switch, the second terminal of the second electrical switch, the second terminal of the third electrical switch, the second terminal of the fourth electrical switch are drain electrodes of transistors.

### Claim 13 (depends on 9)

The liquid crystal driving circuit according to claim 9, wherein the transistors are npn transistors.

### Claim 14 (depends on 1)

The liquid crystal driving circuit according to claim 1, wherein the fifth electrical switch is a transistor, the fifth electrical switch further comprises a control terminal of the fifth electrical switch.

### Claim 15 (depends on 14)

The liquid crystal driving circuit according to claim 14, wherein the control terminal of the fifth electrical switch is a gate electrode of the transistor, the first terminal of the fifth electrical switch is a source electrode of the transistor, and the second terminal of the fifth electrical switch is a drain electrode of the transistor.

### Claim 16 (depends on 14)

The liquid crystal driving circuit according to claim 14, wherein the transistor is an npn transistor.

### Claim 17 (depends on 1)

The liquid crystal driving circuit according to claim 1, wherein the fifth electrical switch is a diode, the first terminal of the fifth electrical switch is a negative terminal of the diode, the second terminal of the fifth electrical switch is a positive terminal of the diode.

### Claim 18 (depends on 1)

A liquid crystal display device, comprising the pixel units and the liquid crystal driving circuit according to claim 1, wherein the liquid crystal driving circuit is used for providing power to the pixel units.

### Claim 19 (depends on 15)

A liquid crystal display device, comprising the pixel units and the liquid crystal driving circuit according to claim 15, wherein the liquid crystal driving circuit is used for providing power to the pixel units.

### Claim 20 (depends on 17)

A liquid crystal display device, comprising the pixel units and the liquid crystal driving circuit according to claim 17, wherein the liquid crystal driving circuit is used for providing power to the pixel units.