Driving circuit of display panel, display panel and display device

• US 10,643,541 B2
• Filed: 03/06/2018
• Issued: 05/05/2020
• Est. Priority Date: 05/12/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Xuan, Minghua, Yang, Shengji, Xiao, Li, Liu, Dongni, Fu, Jie, Lu, Pengcheng, Chen, Xiaochuan, Wang, Lei
• Primary Examiner(s): Sadio, Insa
• Application Number:
  US16/090,700
• Publication Number:
  US 20190385529A1
• Time in Patent Office: 791 Days
• CPC Class Codes: G09G 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element

Abstract

The present disclosure relates to a driving circuit of a display panel, a display panel and a display device. The driving circuit includes at least one potential saving unit and at least one column of pixel driving units. The potential saving unit is arranged corresponding to a column of pixel units, and is configured to output a first potential signal based on a voltage of the external preset power supply and save the first potential signal to the first potential output terminal, while outputting a second potential signal and saving the second potential signal to the second potential output terminal.

Claims

1. A driving circuit of a display panel, comprising:

at least one potential saving unit, arranged corresponding to a column of pixel units, wherein the potential saving unit comprises a power supply terminal, a first potential output terminal and a second potential output terminal, the power supply terminal is connected with an external preset power supply, and the potential saving unit is configured to output a first potential signal based on a voltage of the external preset power supply and save the first potential signal to the first potential output terminal, while outputting a second potential signal and saving the second potential signal to the second potential output terminal; and

at least one column of pixel driving units, comprising one or more pixel driving units, wherein each of the pixel driving units is connected with the first potential output terminal, the second potential output terminal, a corresponding control signal line and a corresponding pixel unit, and each of the pixel driving units drives the corresponding pixel unit based on a control signal of the corresponding control signal line, the first potential signal and the second potential signal.

2. The driving circuit according to claim 1, wherein each of the pixel driving units comprises:

a first transistor, comprising a first terminal connected with the first potential output terminal and a control terminal connected with the corresponding control signal line; and

a second transistor, comprising a first terminal connected with a second terminal of the first transistor and the corresponding pixel unit, a second pole connected with the second potential output terminal, and a control terminal connected with the corresponding control signal line via an inverter.

3. The driving circuit according to claim 2, further comprising:

at least one shifting register, a third transistor and a fourth transistor, both the third transistor and the fourth transistor being connected with the shifting register, wherein

a control terminal of the third transistor is connected with an output terminal of the shifting register, a first terminal of the third transistor is connected with the first potential output terminal, and a second terminal of the third transistor is connected with the first terminal of the first transistor; and

a control terminal of the fourth transistor is connected with the output terminal of the shifting register, a first terminal of the fourth transistor is connected with the second potential output terminal, and a second terminal of the fourth transistor is connected with the second terminal of the second transistor.

4. The driving circuit according to claim 3, wherein the corresponding pixel unit comprises a light emitting diode, an anode of the light emitting diode is connected with the first terminal of the second transistor and the second terminal of the first transistor, and a cathode of the light emitting diode is grounded,

in a case where the first potential signal is a high level signal being capable of turning on the light emitting diode, the second potential signal is a low level signal being capable of turning off the light emitting diode, the control signal of the corresponding control signal line is a high level signal being capable of turning on the first transistor and turning off the second transistor, and the output terminal of the shifting register has a high level signal being capable of turning on the third transistor and the fourth transistor, the light emitting diode is turned on, and

in a case where the first potential signal is a high level signal being capable of turning on the light emitting diode, the second potential signal is a low level signal being capable of turning off the light emitting diode, the control signal of the corresponding control signal line is a low level signal being capable of turning off the first transistor and turning on the second transistor, and the output terminal of the shifting register has a high level signal being capable of turning on the third transistor and the fourth transistor, the light emitting diode is turned off.

5. The driving circuit according to claim 1, wherein an amount of the potential saving units, an amount of the columns of the pixel driving units and an amount of the shifting registers are all the same.

6. The driving circuit according to claim 5, wherein the display panel comprises N rows and M columns of pixel units, where N and M are positive integers;

the driving circuit comprises M potential saving units, M columns of pixel driving units and M shifting registers, each column of the pixel driving units is controlled by one potential saving unit and one shifting register, and there is a one-to-one correspondence between the pixel driving units and the pixel units.

7. The driving circuit according to claim 1, wherein the potential saving unit comprises:

a fifth transistor, comprising a control terminal connected with the external preset power supply and the first potential output terminal, and a first terminal which is grounded; and

a sixth transistor, comprising a control terminal connected with a second terminal of the fifth transistor and the second potential output terminal, a first terminal connected with an internal preset power supply, and a second terminal connected with the control terminal of the fifth transistor.

8. The driving circuit according to claim 7, wherein the potential saving unit further comprises:

a seventh transistor, comprising a first terminal connected with the external preset power supply, a second terminal connected with the control terminal of the fifth transistor and the first potential output terminal, and a control terminal connected with a power supply control signal line.

11. The driving circuit according to claim 2, wherein an amount of the potential saving units, an amount of the columns of the pixel driving units and an amount of the shifting registers are all the same.

12. The driving circuit according to claim 3, wherein an amount of the potential saving units, an amount of the columns of the pixel driving units and an amount of the shifting registers are all the same.

13. The driving circuit according to claim 4, wherein an amount of the potential saving units, an amount of the columns of the pixel driving units and an amount of the shifting registers are all the same.

14. The driving circuit according to claim 2, wherein the potential saving unit comprises:

a fifth transistor, comprising a control terminal connected with the external preset power supply and the first potential output terminal, and a first terminal which is grounded; and

a sixth transistor, comprising a control terminal connected with a second terminal of the fifth transistor and the second potential output terminal, a first terminal connected with an internal preset power supply, and a second terminal connected with the control terminal of the fifth transistor.

15. The driving circuit according to claim 3, wherein the potential saving unit comprises:

a fifth transistor, comprising a control terminal connected with the external preset power supply and the first potential output terminal, and a first terminal which is grounded; and

a sixth transistor, comprising a control terminal connected with a second terminal of the fifth transistor and the second potential output terminal, a first terminal connected with an internal preset power supply, and a second terminal connected with the control terminal of the fifth transistor.

16. The driving circuit according to claim 4, wherein the potential saving unit comprises:

a fifth transistor, comprising a control terminal connected with the external preset power supply and the first potential output terminal, and a first terminal which is grounded; and

a sixth transistor, comprising a control terminal connected with a second terminal of the fifth transistor and the second potential output terminal, a first terminal connected with an internal preset power supply, and a second terminal connected with the control terminal of the fifth transistor.

9. A display panel, comprising a driving circuit, the driving circuit comprising:

at least one potential saving unit, arranged corresponding to a column of pixel units, wherein the potential saving unit comprises a power supply terminal, a first potential output terminal and a second potential output terminal, the power supply terminal is connected with an external preset power supply, and the potential saving unit is configured to output a first potential signal based on a voltage of the external preset power supply and save the first potential signal to the first potential output terminal, while outputting a second potential signal and saving the second potential signal to the second potential output terminal; and

at least one column of pixel driving units, comprising one or more pixel driving units, wherein each of the pixel driving units is connected with the first potential output terminal, the second potential output terminal, a corresponding control signal line and a corresponding pixel unit, and each of the pixel driving units drives the corresponding pixel unit based on a control signal of the corresponding control signal line, the first potential signal and the second potential signal.

17. The display panel according to claim 9, wherein each of the pixel driving units comprises:

a first transistor, comprising a first terminal connected with the first potential output terminal and a control terminal connected with the corresponding control signal line; and

a second transistor, comprising a first terminal connected with a second terminal of the first transistor and the corresponding pixel unit, a second pole connected with the second potential output terminal, and a control terminal connected with the corresponding control signal line via an inverter.

18. The display panel according to claim 17, wherein the driving circuit further comprises:

at least one shifting register, a third transistor and a fourth transistor, both the third transistor and the fourth transistor being connected with the shifting register, wherein

a control terminal of the third transistor is connected with an output terminal of the shifting register, a first terminal of the third transistor is connected with the first potential output terminal, and a second terminal of the third transistor is connected with the first terminal of the first transistor; and

a control terminal of the fourth transistor is connected with the output terminal of the shifting register, a first terminal of the fourth transistor is connected with the second potential output terminal, and a second terminal of the fourth transistor is connected with the second terminal of the second transistor.

19. The display panel according to claim 18, wherein the corresponding pixel unit comprises a light emitting diode, an anode of the light emitting diode is connected with the first terminal of the second transistor and the second terminal of the first transistor, and a cathode of the light emitting diode is grounded,

in a case where the first potential signal is a high level signal being capable of turning on the light emitting diode, the second potential signal is a low level signal being capable of turning off the light emitting diode, the control signal of the corresponding control signal line is a high level signal being capable of turning on the first transistor, and the output terminal of the shifting register has a high level signal being capable of turning on the third transistor and the fourth transistor, the light emitting diode is turned on, and

in a case where the first potential signal is a high level signal being capable of turning on the light emitting diode, the second potential signal is a low level signal being capable of turning off the light emitting diode, the control signal of the corresponding control signal line is a low level signal being capable of turning off the first transistor, and the output terminal of the shifting register has a high level signal being capable of turning on the third transistor and the fourth transistor, the light emitting diode is turned off.

20. The display panel according to claim 9, wherein an amount of the potential saving units, an amount of the columns of the pixel driving units and an amount of the shifting registers are all the same.

10. A display device, comprising a display panel, the display panel comprising a driving circuit, the driving circuit comprising:

at least one potential saving unit, arranged corresponding to a column of pixel units, wherein the potential saving unit comprises a power supply terminal, a first potential output terminal and a second potential output terminal, the power supply terminal is connected with an external preset power supply, and the potential saving unit is configured to output a first potential signal based on a voltage of the external preset power supply and save the first potential signal to the first potential output terminal, while outputting a second potential signal and saving the second potential signal to the second potential output terminal; and

at least one column of pixel driving units, comprising one or more pixel driving units, wherein each of the pixel driving units is connected with the first potential output terminal, the second potential output terminal a corresponding control signal line and a corresponding pixel unit, and each of the pixel driving units drives the corresponding pixel unit based on a control signal of the corresponding control signal line, the first potential signal and the second potential signal.