Pixel compensating circuit and driving method thereof, array substrate and display device

• US 10,255,859 B2
• Filed: 10/31/2016
• Issued: 04/09/2019
• Est. Priority Date: 11/12/2015
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Ordos Yuansheng Optoelectronics Co., Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Ordos Yuansheng Optoelectronics Co., Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: Wang, Bo, Xuan, Minghua, Ma, Zhanjie
• Primary Examiner(s): Abdulselam, Abbas I
• Application Number:
  US15/529,301
• Publication Number:
  US 20170263186A1
• Time in Patent Office: 890 Days
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

A pixel compensating circuit and a driving method thereof, an array substrate and a display device. The pixel compensating circuit includes: a reset circuit, connected with a reset signal line, and configured to reset a driving circuit according to a reset signal from the reset signal line; the driving circuit, configured to output a driving current to drive a display apparatus to emit light and display; a compensating circuit, connected with a signal control line, and a data line, and configured to compensate a threshold voltage for the driving circuit and write data into the driving circuit under control of a signal control signal from the signal control line; and a luminance control circuit, connected with a luminance control line, and configured to control the driving circuit to drive the display apparatus to emit light and display according to a luminance control signal from the luminance control line.

Claims

1. A pixel compensating circuit for an active-matrix organic light-emitting diode, comprising:

a reset circuit, connected with a reset signal line and a driving circuit, and configured to reset the driving circuit according to a reset signal inputted from the reset signal line;

the driving circuit, configured to output a driving current to drive a display apparatus to emit light and display;

a compensating circuit, connected with a signal control line, a data line and the driving circuit, and configured to compensate a threshold voltage for the driving circuit and write data into the driving circuit under control of a signal control signal inputted from the signal control line; and

a luminance control circuit, connected with a luminance control line, the driving circuit and an anode of the display apparatus, and configured to control the driving circuit to drive the display apparatus to emit light and display according to a luminance control signal inputted from the luminance control line,

wherein the driving circuit comprises;

a first transistor, a control electrode of the first transistor connected with a first node, a first electrode of the first transistor connected with a first voltage end, and a second electrode of the first transistor connected with the compensating circuit and the luminance control circuit; and

a capacitor, two ends of the capacitor being the first node and the second node respectively, and the second node connected with the reset circuit, the compensating circuit and the luminance control circuit;

wherein the reset circuit comprises;

a third transistor, a control electrode of the third transistor connected with a first electrode of the third transistor and the reset signal line, and a second electrode of the third transistor connected with the first node.

2. The pixel compensating circuit according to claim 1, wherein the reset circuit further comprises:

a seventh transistor, a control electrode of the seventh transistor connected with the reset signal line and the control electrode of the third transistor, a first electrode of the seventh transistor connected with the data line, and a second electrode of the seventh transistor connected with the second node.

3. The pixel compensating circuit according to claim 2, wherein each of the third transistor and the seventh transistor is a thin film transistor.

4. The pixel compensating circuit according to claim 1, wherein the compensating circuit comprises:

a second transistor, a control electrode of the second transistor connected with the signal control line, a first electrode of the second transistor connected with the second electrode of the first transistor, and a second electrode of the second transistor connected with the first node; and

a fourth transistor, a control electrode of the fourth transistor connected with the signal control line, a first electrode of the fourth transistor connected with the data line, and a second electrode of the fourth transistor connected with the second node.

5. The pixel compensating circuit according to claim 4, wherein the compensating circuit further comprises:

an eighth transistor, a control electrode of the eighth transistor connected with a first electrode of the eighth transistor and the signal control line, and a second electrode of the eighth transistor connected with the anode of the display apparatus.

6. The pixel compensating circuit according to claim 5, wherein each of the second transistor and the fourth transistor is a thin film transistor;

and the eighth transistor is a thin film transistor.

7. The pixel compensating circuit according to claim 1, wherein the luminance control circuit comprises:

a fifth transistor, a control electrode of the fifth transistor connected with the luminance control line, a first electrode of the fifth transistor connected with a reference voltage end, and a second electrode of the fifth transistor connected with the second node; and

a sixth transistor, a control electrode of the sixth transistor connected with the luminance control line, a first electrode of the sixth transistor connected with the second electrode of the first transistor, and a second electrode of the sixth transistor connected with the anode of the display apparatus.

8. The pixel compensating circuit according to claim 7, wherein the display apparatus is an organic light emitting diode, the anode of which is connected with the second electrode of the sixth transistor and a cathode of which is connected with a second voltage end.

9. The pixel compensating circuit according to claim 1, wherein the reset signal, the signal control signal and the luminance control signal respectively correspond to a reset phase, a signal control phase and a luminance control phase.

10. The pixel compensating circuit according to claim 9, wherein during the reset phase, the reset signal is a low voltage level, and the signal control signal and the luminance control signal are high voltage levels.

11. The pixel compensating circuit according to claim 9, wherein during the signal control phase, the reset signal is changed from the low voltage level to a high voltage level, the signal control signal is changed from the high voltage level to the low voltage level, and the luminance control signal is the high voltage level.

12. The pixel compensating circuit according to claim 9, wherein during the luminance control phase, the reset signal is a high voltage level, the signal control signal is changed from the low voltage level to the high voltage level, and the luminance control signal is changed from the high voltage level to the low voltage level.

13. The pixel compensating circuit according to claim 1, wherein the first transistor is a thin film transistor.

14. An array substrate, comprising the pixel compensating circuit according to claim 1.

15. An active-matrix organic light-emitting diode display device, comprising the array substrate according to claim 14.

16. A driving method for the pixel compensating circuit according to claim 1, comprising:

during a reset phase, applying an effective reset signal to the reset signal line to turn on the reset circuit, so as to reset the driving circuit;

during a signal control phase, applying an effective signal control signal to the signal control line to compensate the threshold voltage for the driving circuit and write the data into the driving circuit; and

during a luminance control phase, applying an effective luminance control signal to the luminance control line to turn on the luminance control circuit, so as to control the driving circuit to drive the display apparatus to emit light and display.

17. The pixel compensating circuit according to claim 1,

wherein the reset circuit further comprises:

the seventh transistor, a control electrode of the seventh transistor connected with the reset signal line and the control electrode of the third transistor, a first electrode of the seventh transistor connected with the data line, and a second electrode of the seventh transistor connected with the second node; and

wherein the compensating circuit comprises;

a second transistor, a control electrode of the second transistor connected with the signal control line, a first electrode of the second transistor connected with the second electrode of the first transistor, and a second electrode of the second transistor connected with the first node;

a fourth transistor, a control electrode of the fourth transistor connected with the signal control line, a first electrode of the fourth transistor connected with the data line, and a second electrode of the fourth transistor connected with the second node; and

an eighth transistor, a control electrode of the eighth transistor connected with a first electrode of the eighth transistor and the signal control line, and a second electrode of the eighth transistor connected with the anode of the display apparatus.

18. A pixel compensating circuit for an active-matrix organic light-emitting diode, comprising:

a reset circuit, connected with a reset signal line and a driving circuit, and configured to reset the driving circuit according to a reset signal inputted from the reset signal line;

the driving circuit, configured to output a driving current to drive a display apparatus to emit light and display;

a compensating circuit, connected with a signal control line, a data line and the driving circuit, and configured to compensate a threshold voltage for the driving circuit and write data into the driving circuit under control of a signal control signal inputted from the signal control line; and

a luminance control circuit, connected with a luminance control line, the driving circuit and an anode of the display apparatus, and configured to control the driving circuit to drive the display apparatus to emit light and display according to a luminance control signal inputted from the luminance control line,

wherein the driving circuit comprises;

a first transistor, a control electrode of the first transistor connected with a first node, a first electrode of the first transistor connected with a first voltage end, and a second electrode of the first transistor connected with the compensating circuit and the luminance control circuit; and

a capacitor, two ends of the capacitor being the first node and the second node respectively, and the second node connected with the reset circuit, the compensating circuit and the luminance control circuit; and

wherein the compensating circuit comprises;

a second transistor, a control electrode of the second transistor connected with the signal control line, a first electrode of the second transistor connected with the second electrode of the first transistor, and a second electrode of the second transistor connected with the first node; and

a fourth transistor, a control electrode of the fourth transistor connected with the signal control line, a first electrode of the fourth transistor connected with the data line, and a second electrode of the fourth transistor connected with the second node.

19. The pixel compensating circuit according to claim 18, wherein the compensating circuit further comprises:

an eighth transistor, a control electrode of the eighth transistor connected with a first electrode of the eighth transistor and the signal control line, and a second electrode of the eighth transistor connected with the anode of the display apparatus.

20. A pixel compensating circuit for an active-matrix organic light-emitting diode, comprising:

a reset circuit, connected with a reset signal line and a driving circuit, and configured to reset the driving circuit according to a reset signal inputted from the reset signal line;

the driving circuit, configured to output a driving current to drive a display apparatus to emit light and display;

a compensating circuit, connected with a signal control line, a data line and the driving circuit, and configured to compensate a threshold voltage for the driving circuit and write data into the driving circuit under control of a signal control signal inputted from the signal control line; and

a luminance control circuit, connected with a luminance control line, the driving circuit and an anode of the display apparatus, and configured to control the driving circuit to drive the display apparatus to emit light and display according to a luminance control signal inputted from the luminance control line,

wherein the driving circuit comprises;

a first transistor, a control electrode of the first transistor connected with a first node, a first electrode of the first transistor connected with a first voltage end, and a second electrode of the first transistor connected with the compensating circuit and the luminance control circuit; and

a capacitor, two ends of the capacitor being the first node and the second node respectively, and the second node connected with the reset circuit, the compensating circuit and the luminance control circuit; and

wherein the luminance control circuit comprises;

a fifth transistor, a control electrode of the fifth transistor connected with the luminance control line, a first electrode of the fifth transistor connected with a reference voltage end, and a second electrode of the fifth transistor connected with the second node; and

a sixth transistor, a control electrode of the sixth transistor connected with the luminance control line, a first electrode of the sixth transistor connected with the second electrode of the first transistor, and a second electrode of the sixth transistor connected with the anode of the display apparatus.