# US 9,520,098 B2 · Gate driving circuit, display device and driving method

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- Number: US 9,520,098 B2
- Document ID: US9520098B2
- Status: Granted
- Kind: B2
- Application number: 14/424,917
- Filed: 2014-05-28
- Published: 2016-01-28
- Granted: 2016-12-13
- Earliest claimed: 2013-12-25
- Assignees: Boe Technology Group Co., Ltd.; Hefei Boe Optoelectronics Technology Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.; Hefei Boe Optoelectronics Technology Co., Ltd.
- Inventors: Hongmin Li; Xiaohe Li; Xiaojie Zhang; Xianjie Shao
- Web page: https://patentgrep.com/patent/US9520098B2

## CPC

- G09G 3/3677: {suitable for active matrices only}
- G09G 3/3614: {Control of polarity reversal in general}
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2310/0218: with collection of electrodes in groups for n-dimensional addressing
- G09G 2310/0289: Details of voltage level shifters arranged for use in a driving circuit
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- 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

A gate driving circuit, a display device, and a driving method are disclosed in the present invention. The gate driving circuit comprises: a plurality of cascaded shift register units and a control unit, wherein every two adjacent shift register units constitute a shift register set and are connected to two gate lines through the control unit, and wherein the control unit controls the shift register units of the shift register set to supply drive signals to the two gate lines, respectively. Embodiments of the present invention improve a configuration of the circuit on the basis of original shift registers, thereby achieving compensation of charge rations between different frames and effectively alleviating phenomena of apparent bright/dark lines such as the vertical lines of the existing products.

## Claims

### Claim 1

A gate driving circuit comprising:
a plurality of cascaded shift register units; and
a control unit,
wherein every two shift register units constitute a shift register set and are connected to two gate lines through the control unit,
wherein the control unit controls the shift register units of each shift register set to supply drive signals to the two gate lines, and
wherein the control unit comprises:
a plurality of pairs of thin film transistors, wherein each of the shift register units of each shift register set is connected to the two gate lines through one pair of thin film transistors of the plurality of pairs of thin film transistors; and
a first control line and a second control line for respectively controlling each pair of thin film transistors of the plurality of pairs of thin film transistors such that each pair of thin film transistors of the plurality of pairs of thin film transistors are respectively turned on and off so that the shift register units of each shift register set selectively supply the drive signals to the two gate lines.

### Claim 2 (depends on 1)

The gate driving circuit of claim 1, wherein the control unit comprises a first control line, a second control line, and thin film transistors connected to the shift register units.

### Claim 3 (depends on 2)

The gate driving circuit of claim 2, wherein each of the shift register units of each shift register set is connected to the first control line and the second control line through two of the thin film transistors, respectively, and the two thin film transistors comprise gates respectively connected to the first control line and the second control line, drains respectively connected to the two gate lines, and sources connected to an output of a corresponding one of the shift register units of the shift register set.

### Claim 4 (depends on 1)

The gate driving circuit of claim 1, wherein the control unit controls each of the shift register units of each shift register set to supply the drive signals to the two gate lines in two consecutive frame scans, respectively.

### Claim 5 (depends on 2)

The gate driving circuit of claim 2, wherein the first control line and the second control line alternately output high-electric potential drive signals.

### Claim 6 (depends on 1)

The gate driving circuit of claim 1, wherein the two gate lines are connected respectively to pixel units in odd-numbered columns and pixel units in even-numbered columns, of an array of pixel units.

### Claim 7 (depends on 6)

The gate driving circuit of claim 6, wherein the gate lines and the pixel units are connected to one another through pixel unit thin film transistors, and the pixel unit thin film transistors each have a gate connected to the gate line, a drain connected to a pixel electrode of the respective pixel unit, and a source connected to the data line.

### Claim 8 (depends on 1)

A display device comprising: the gate driving circuit of claim 1.

### Claim 9 (depends on 8)

The display device of claim 8, wherein the display device comprises N rows by M columns of pixel units, 2N gate lines, and M/2 data lines, wherein the 2N gate lines and the M/2 data lines cross one another to define the pixel units, odd-numbered ones of the gate lines are connected respectively to the pixel units in the odd-numbered columns, even-numbered ones of the gate lines are connected respectively to the pixel units in the even-numbered columns, the pixel units in every two adjacent columns of the odd-numbered columns and the even-numbered columns are connected to a same one of the data lines, and the two gate lines are one of the odd-numbered gate lines and one of the even-numbered gate lines, that are adjacent to each other.

### Claim 10 (depends on 9)

A driving method of driving the display device of claim 9, the driving method comprising:
a current frame scan step: turning on and off the cascaded shift register units in sequence and controlling, by the control unit, supply of a drive signal from the turned-on ones of the shift register units to an odd-numbered or even-numbered one of the two gate lines; and
a next frame scan step: turning on and off the cascaded shift register units in sequence and controlling, by the control unit, supply of a drive signal from the turned-on ones of the shift register units to an even-numbered or odd-numbered one of the two gate lines.

### Claim 11 (depends on 10)

The driving method of claim 10, wherein:
the current frame scan step comprises:
turning on a first shift register unit of an n-th shift register set of the shift register sets, and controlling, by the control unit, supply of a drive signal from the turned-on first shift register unit to an odd-numbered one of the two gate lines connected to the first shift register unit, and charging the pixel units in odd-numbered columns of an n-th row through the data lines; and
turning on a second shift register unit of the n-th shift register set, and controlling, by the control unit, supply of a drive signal from the turned-on second shift register unit to an even-numbered one of the two gate lines, and charging the pixel units in even-numbered columns of the n-th row through the data lines; and
the next frame scan step comprises:
turning on the first shift register unit of the n-th shift register set, and controlling, by the control unit, supply of a drive signal from the turned-on first shift register unit to the even-numbered one of the two gate lines connected to the first shift register unit, and charging the pixel units in the even-numbered of the n-th row through the data lines; and
turning on the second shift register unit of the n-th shift register set, and controlling, by the control unit, supply of a drive signal from the turned-on second shift register unit to the odd-numbered one of the two gate lines, and charging the pixel units in the odd-numbered columns of the n-th row through the data lines; and
wherein charging polarities of the pixel units in two adjacent ones of the rows are opposite to each other, charging polarities of the pixel units in two adjacent ones of the columns that are connected to a same one of the data lines are opposite to each other, charging polarities of the pixel units in two adjacent ones of the columns that are connected to different ones of the data lines are the same, and n is a natural number less than or equal to N.

### Claim 12 (depends on 1)

The gate driving circuit of claim 1, wherein the one pair of thin film transistors comprise gates respectively connected to the first control line and the second control line, drains respectively connected to the two gate lines, and sources connected to an output of a corresponding one of the shift register units of the shift register set.

### Claim 13 (depends on 1)

The gate driving circuit of claim 1, wherein the control unit controls the shift register units of each shift register set to supply the drive signals to the two gate lines in a same frame scan, respectively.

### Claim 14 (depends on 1)

The gate driving circuit of claim 1 wherein the first control line and the second control line alternately output high-electric potential drive signals.

### Claim 15 (depends on 3)

The gate driving circuit of claim 3, wherein the first control line and the second control line alternately output high-electric potential drive signals.

### Claim 16 (depends on 12)

The gate driving circuit of claim 12, wherein the first control line and the second control line alternately output high-electric potential drive signals.

### Claim 17 (depends on 1)

The gate driving circuit of claim 1, wherein the two shift register units of the shift register set are disposed adjacent to each other.