SCANNING DRIVING CIRCUIT AND DISPLAY APPARATUS

• US 20190012966A1
• Filed: 08/18/2017
• Published: 01/10/2019
• Est. Priority Date: 07/04/2017
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Wuhan China Star Optoelectronics Semiconductor Display Technology Ltd.
• Original Assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
• Inventors: SHI, Longqiang
• Granted Patent: US 10,460,671 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/04 Maintaining the quality of display appearance
• CPC Class Codes: G09G 2330/025 Reduction of instantaneous peaks of current
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

The present application discloses a scanning driving circuit and a display apparatus. The scanning driving circuit includes a scanning signal output terminal; a pull-up circuit controlling the scanning signal output terminal to output a high level scanning signal; a transmission circuit for outputting a stage transmission signal of a current stage; a pull-up control circuit to charge the pull-up control signal point; a pull-down maintaining circuit maintains the low level of the pull-up control signal point and the scanning signal output terminal and releases the high potential of the pull-up control signal point; a bootstrap circuit raises the potential of the pull-up control signal point; a pull-down circuit controls the scanning signal output terminal to output a low level, thereby solving the problem of the large current generated when the display device is turned on and off.

Claims

1. A scanning driving circuit, wherein the scanning driving circuit comprising:

a first voltage terminal;

a second voltage terminal;

a scanning signal output terminal for outputting a high level scanning signal or a low level scanning signal;

a pull-up circuit for receiving a clock signal of a current stage and controlling the scanning signal output terminal to output of a high level scanning signal according to the clock signal of the current stage;

a transmission circuit, connected to the pull-up circuit for outputting a high level stage transmission signal of a current stage;

a pull-up control circuit, connected to the transmission circuit and receiving a stage transmission signal of a previous stage for charging the pull-up control signal point to pull up the potential of the pull-up control signal point to a high level;

a pull-down maintenance circuit connected to the pull-up control circuit, the first voltage terminal and the second voltage terminal and receiving a high voltage direct current voltage, for maintaining the low level of the pull-up control signal point, and the low level of the scanning signal outputted from the scanning signal output terminal;

a bootstrap circuit for raising the potential of the pull-up control signal point;

a pull-down circuit connected to the transmission circuit, the pull-down maintenance circuit, and the first voltage terminal, for receiving a stage transmission signal of a next stage and controlling the scanning signal output terminal to output the low level scanning signal in accordance with the stage transmission signal of the next stage;

wherein the pull-up circuit comprises a first controllable switch, a first terminal of the first controllable switch receiving the clock signal of the current stage, a control terminal of the first controllable switch is connected to the transmission circuit and the pull-down circuit, a second terminal of the first controllable switch is connected to the transmission circuit and the scanning signal output terminal; and

wherein when the scanning driving circuit is not operated, the second voltage terminal is at high potential, and when the scanning driving circuit is operated, the second voltage terminal becomes a low potential, and the low potential is the same with the first voltage terminal.

2. A scanning driving circuit, wherein the scanning driving circuit comprising:

a first voltage terminal;

a second voltage terminal;

a scanning signal output terminal for outputting a high level scanning signal or a low level scanning signal;

a pull-up circuit for receiving a clock signal of a current stage and controlling the scanning signal output terminal to output of a high level scanning signal according to the clock signal of the current stage;

a transmission circuit, connected to the pull-up circuit for outputting a high level stage transmission signal of a current stage;

a pull-up control circuit, connected to the transmission circuit and receiving a stage transmission signal of a previous stage for charging the pull-up control signal point to pull up the potential of the pull-up control signal point to a high level;

a pull-down maintenance circuit connected to the pull-up control circuit, the first voltage terminal and the second voltage terminal and receiving a high voltage direct current voltage, for maintaining the low level of the pull-up control signal point, and the low level of the scanning signal outputted from the scanning signal output terminal;

a bootstrap circuit for raising the potential of the pull-up control signal point; and

a pull-down circuit connected to the transmission circuit, the pull-down maintenance circuit, and the first voltage terminal, for receiving a stage transmission signal of a next stage and controlling the scanning signal output terminal to output the low level scanning signal in accordance with the stage transmission signal of the next stage.

3. The scanning driving circuit according to claim 2, wherein the pull-up circuit comprising a first controllable switch, a first terminal of the first controllable switch receiving the clock signal of the current stage, a control terminal of the first controllable switch is connected to the transmission circuit and the pull-down circuit, a second terminal of the first controllable switch is connected to the transmission circuit and the scanning signal output terminal.

4. The scanning driving circuit according to claim 3, wherein the transmission circuit comprising a second controllable switch, a control terminal of the second controllable switch is connected to the control terminal of the first controllable switch, and a first terminal of the second controllable switch is connected to the first terminal of the first controllable switch, and a second terminal of the second controllable switch outputs the stage transmission signal of the current stage.

5. The scanning driving circuit according to claim 4, wherein, the pull-up control circuit comprising a third controllable switch, a control terminal of the third controllable switch is connected to a first terminal of the third controllable switch and receives the stage transmission signal of the previous stage, a second terminal of the third controllable switch is connected to the control terminal of the second controllable switch and the pull-down maintenance circuit.

6. The scanning driving circuit according to claim 5, wherein the pull-down maintenance circuit comprising fourth to ninth controllable switches, a control terminal of the fourth controllable switch is connected to a control terminal of the fifth controllable switch, a first terminal of the controllable switch is connected to the second terminal of the third controllable switch, a second terminal of the fourth controllable switch is connected to the first voltage terminal, a first terminal of the fifth controllable switch is connected to the scanning signal output terminal, a second terminal of the fifth controllable switch is connected to the first voltage terminal, a second terminal of the sixth controllable switch is connected to a first terminal of the seventh controllable switch and the control terminal of the fifth controllable switch, a first terminal of the sixth controllable switch is connected to a first terminal of the eighth controllable switch and a control terminal of the eighth controllable switch and to receive the high voltage direct current voltage, a control terminal of the sixth controllable switch is connected to the second terminal of the eighth controllable switch and a first terminal of the ninth controllable switch, a control terminal of the seventh controllable switch is connected to a control terminal of the ninth controllable switch and the second terminal of the third controllable switch, a second terminal of the seventh controllable switch and a second terminal of the ninth controllable switch are both connected to the second voltage terminal.

7. The scanning driving circuit according to claim 6, wherein the pull-down circuit comprising a tenth controllable switch and an eleventh controllable switch, a control terminal of the tenth controllable switch is connected to a control terminal of the eleventh controllable switch and receives the stage transmission signal of the next stage, a first terminal of the tenth controllable switch is connected to the control terminal of the second controllable switch, a second terminal of the tenth controllable switch is connected the first voltage terminal, a first terminal of the eleventh controllable switch is connected to the scanning signal output terminal and the second terminal of the first controllable switch, a second terminal of the eleventh controllable switch is connected to the first voltage terminal.

8. The scanning driving circuit according to claim 7, wherein the bootstrap circuit comprising a bootstrap capacitor, a first terminal of the bootstrap capacitor is connected to the control terminal of the first controllable switch, a second terminal of the bootstrap capacitor is connected to the scanning signal output terminal.

9. The scanning driving circuit according to claim 7, wherein the first to eleventh controllable switches are N-type thin film transistors, the control terminals, the first terminals and the second terminals of the first to twelfth controllable switches are respectively correspond to gates, sources and drains of the N-type thin film transistor.

10. The scanning driving circuit according to claim 2, wherein when the scanning driving circuit is not operated, the second voltage terminal is at high potential, and when the scanning driving circuit is operated, the second voltage terminal becomes a low potential, and the low potential is the same with the first voltage terminal.

11. A display apparatus, wherein the display apparatus comprises a scanning driving circuit, the scanning driving circuit comprising:

a first voltage terminal;

a second voltage terminal;

a scanning signal output terminal for outputting a high level scanning signal or a low level scanning signal;

a pull-up circuit for receiving a clock signal of a current stage and controlling the scanning signal output terminal to output of a high level scanning signal according to the clock signal of the current stage;

a transmission circuit, connected to the pull-up circuit for outputting a high level stage transmission signal of a current stage;

a pull-up control circuit, connected to the transmission circuit and receiving a stage transmission signal of a previous stage for charging the pull-up control signal point to pull up the potential of the pull-up control signal point to a high level;

a pull-down maintenance circuit connected to the pull-up control circuit, the first voltage terminal and the second voltage terminal and receiving a high voltage direct current voltage, for maintaining the low level of the pull-up control signal point, and the low level of the scanning signal outputted from the scanning signal output terminal;

a bootstrap circuit for raising the potential of the pull-up control signal point; and

a pull-down circuit connected to the transmission circuit, the pull-down maintenance circuit, and the first voltage terminal, for receiving a stage transmission signal of a next stage and controlling the scanning signal output terminal to output the low level scanning signal in accordance with the stage transmission signal of the next stage.

12. The display apparatus according to claim 11, wherein the pull-up circuit comprising a first controllable switch, a first terminal of the first controllable switch receiving the clock signal of the current stage, a control terminal of the first controllable switch is connected to the transmission circuit and the pull-down circuit, a second terminal of the first controllable switch is connected to the transmission circuit and the scanning signal output terminal.

13. The display apparatus according to claim 12, wherein the transmission circuit comprising a second controllable switch, a control terminal of the second controllable switch is connected to the control terminal of the first controllable switch, and a first terminal of the second controllable switch is connected to the first terminal of the first controllable switch, and a second terminal of the second controllable switch outputs the stage transmission signal of the current stage.

14. The display apparatus according to claim 13, wherein, the pull-up control circuit comprising a third controllable switch, a control terminal of the third controllable switch is connected to a first terminal of the third controllable switch and receives the stage transmission signal of the previous stage, a second terminal of the third controllable switch is connected to the control terminal of the second controllable switch and the pull-down maintenance circuit.

15. The display apparatus according to claim 14, wherein the pull-down maintenance circuit comprising fourth to ninth controllable switches, a control terminal of the fourth controllable switch is connected to a control terminal of the fifth controllable switch, a first terminal of the controllable switch is connected to the second terminal of the third controllable switch, a second terminal of the fourth controllable switch is connected to the first voltage terminal, a first terminal of the fifth controllable switch is connected to the scanning signal output terminal, a second terminal of the fifth controllable switch is connected to the first voltage terminal, a second terminal of the sixth controllable switch is connected to a first terminal of the seventh controllable switch and the control terminal of the fifth controllable switch, a first terminal of the sixth controllable switch is connected to a first terminal of the eighth controllable switch and a control terminal of the eighth controllable switch and to receive the high voltage direct current voltage, a control terminal of the sixth controllable switch is connected to the second terminal of the eighth controllable switch and a first terminal of the ninth controllable switch, a control terminal of the seventh controllable switch is connected to a control terminal of the ninth controllable switch and the second terminal of the third controllable switch, a second terminal of the seventh controllable switch and a second terminal of the ninth controllable switch are both connected to the second voltage terminal.

16. The display apparatus according to claim 15, wherein the pull-down circuit comprising a tenth controllable switch and an eleventh controllable switch, a control terminal of the tenth controllable switch is connected to a control terminal of the eleventh controllable switch and receives the stage transmission signal of the next stage, a first terminal of the tenth controllable switch is connected to the control terminal of the second controllable switch, a second terminal of the tenth controllable switch is connected the first voltage terminal, a first terminal of the eleventh controllable switch is connected to the scanning signal output terminal and the second terminal of the first controllable switch, a second terminal of the eleventh controllable switch is connected to the first voltage terminal.

17. The display apparatus according to claim 16, wherein the bootstrap circuit comprising a bootstrap capacitor, a first terminal of the bootstrap capacitor is connected to the control terminal of the first controllable switch, a second terminal of the bootstrap capacitor is connected to the scanning signal output terminal.

18. The display apparatus according to claim 16, wherein the first to eleventh controllable switches are N-type thin film transistors, the control terminals, the first terminals and the second terminals of the first to twelfth controllable switches are respectively correspond to gates, sources and drains of the N-type thin film transistor.

19. The display apparatus according to claim 11, wherein when the scanning driving circuit is not operated, the second voltage terminal is at high potential, and when the scanning driving circuit is operated, the second voltage terminal becomes a low potential, and the low potential is the same with the first voltage terminal.