Compensation pixel circuit, display panel, display apparatus, compensation method and driving method

• US 10,643,539 B2
• Filed: 03/16/2017
• Issued: 05/05/2020
• Est. Priority Date: 08/12/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Yang, Shengji, Dong, Xue, Lv, Jing, Chen, Xiaochuan, Liu, Dongni, Wang, Lei, Xiao, Li, Yue, Han, Lu, Pengcheng, Fu, Jie, Liu, Yingming, Zhang, Can
• Primary Examiner(s): Lee, Gene W
• Application Number:
  US15/562,513
• Publication Number:
  US 20180357960A1
• Time in Patent Office: 1,146 Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• 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 2300/0819 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 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• 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 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

A compensation pixel circuit, a display panel, a display apparatus, a regional compensation method and a driving method are provided. The compensation pixel circuit includes a compensation driving circuit and a signal acquiring circuit connected with the compensation driving circuit. The compensation driving circuit includes a driving transistor and an organic light-emitting diode. The compensation driving circuit is configured to receive a light-emitting data signal, compensate a threshold voltage of the driving transistor, and drive the organic light-emitting diode to illuminate in accordance with the light-emitting data signal. The signal acquiring circuit is configured to acquire a gate voltage of the driving transistor.

Claims

1. A compensation pixel circuit, comprising:

a compensation driving circuit, comprising a driving transistor and an organic light-emitting diode, wherein the compensation driving circuit is configured to receive a light-emitting data signal, compensate a threshold voltage of the driving transistor, and drive the organic light-emitting diode to illuminate in accordance with the light-emitting data signal;

a signal acquiring circuit connected with the compensation driving circuit and configured to acquire a gate voltage of the driving transistor and be capable of converting the gate voltage into a digital signal; and

a compensation controller, configured to receive the gate voltage of the driving transistor acquired by the signal acquiring circuit,

the compensation controller is further configured to;

receive the light-emitting data signal received by the compensation driving circuit,

subtract a light-emitting voltage in the light-emitting data signal received by the compensation driving circuit from the gate voltage of the driving transistor to obtain the threshold voltage of the driving transistor.

2. The compensation pixel circuit of claim 1, wherein the signal acquiring circuit is electrically connected to the driving transistor.

3. The compensation pixel circuit of claim 1, wherein the compensation driving circuit further comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, and a storage capacitor.

4. The compensation pixel circuit of claim 3, wherein

a first electrode of the first transistor is electrically connected to a first power line to receive a first voltage, a gate of the first transistor and a gate of the fifth transistor are electrically connected to a second scanning signal line to receive a second scanning signal, and a second electrode of the first transistor is electrically connected to a first node;

a first electrode of the second transistor is electrically connected to a light-emitting data signal line to receive the light-emitting data signal, a gate of the second transistor and a gate of the fourth transistor are electrically connected to a first scanning signal line to receive a first scanning signal, and a second electrode of the second transistor is electrically connected to the first node;

a first electrode of the third transistor is electrically connected to a second power line to receive a second voltage, a gate of the third transistor is electrically connected to a control signal line to receive a control signal, and a second electrode of the third transistor is electrically connected to a second node;

a first electrode of the fourth transistor is electrically connected to the second node, and a second electrode of the fourth transistor is electrically connected to a third node;

a first electrode of the fifth transistor is electrically connected to the third node and a second electrode of the fifth transistor is electrically connected to a first electrode of the organic light-emitting diode;

a second electrode of the organic light-emitting diode is connected to ground;

a first electrode of the driving transistor is electrically connected to the first node, a gate of the driving transistor is electrically connected to the second node, and a second electrode of the driving transistor is electrically connected to the third node; and

a first terminal of the storage capacitor is electrically connected to the second power line and a second terminal of the storage capacitor is electrically connected to the second node.

5. The compensation pixel circuit of claim 4, wherein the second power line is connected to ground.

6. A method for driving the compensation pixel circuit of claim 4, comprising:

a reset period, a compensation period and a light-emitting period, wherein

in the reset period, the control signal is set to be a turn-on voltage, the first scanning signal is set to be a turn-off voltage, and the second scanning signal is set to be a turn-off voltage;

in the compensation period, the control signal is set to be a turn-off voltage, the first scanning signal is set to be a turn-on voltage, and the second scanning signal is set to be a turn-off voltage; and

in the light-emitting period, the control signal is set to be a turn-off voltage, the first scanning signal is set to be a turn-off voltage, and the second scanning signal is set to be a turn-on voltage.

7. The method of claim 6, further comprising, before the reset period, a preparation period, in which the control signal is set to be a turn-off voltage, the first scanning signal is set to be a turn-off voltage and the second scanning signal is set to be a turn-off voltage.

8. The compensation pixel circuit of claim 3, wherein the first transistor, the second transistor, the third transistor, the fourth transistor and the fifth transistor are all p-type transistors.

9. The compensation pixel circuit of claim 3, wherein the first transistor, the second transistor, the third transistor, the fourth transistor and the fifth transistor are all thin film transistors.

10. A display panel, comprising the compensation pixel circuit of claim 1.

11. The display panel of claim 10, further comprising a plurality of compensation regions,

wherein each of the plurality of compensation regions comprises at least one of the compensation pixel circuit and non-compensation pixel circuits, and sub-pixel areas occupied by the non-compensation pixel circuits are adjacent to a sub-pixel area occupied by the compensation pixel circuit.

12. The display panel of claim 11, further comprising a compensation controller, wherein the compensation controller is configured to receive the gate voltage of the driving transistor acquired by the signal acquiring circuit and compensate the non-compensation pixel circuits in accordance with the gate voltage of the driving transistor.

13. The display panel of claim 12, wherein the compensation controller is further configured to:

receive a light-emitting data signal received by the compensation driving circuit,

subtract a light-emitting voltage in the light-emitting data signal received by the compensation driving circuit from the gate voltage of the driving transistor to get a threshold voltage of the driving transistor,

receive light-emitting data signals for the non-compensation pixel circuits,

add the threshold voltage to light-emitting voltages of the light-emitting data signals for the non-compensation pixel circuits to get light-emitting voltages of updated light-emitting data signals for the non-compensation pixel circuits, and

send the light-emitting voltages of the updated light-emitting data signals to the non-compensation pixel circuits.

14. The display panel of claim 11, wherein each of the compensation regions includes one compensation pixel circuit and eight non-compensation pixel circuits disposed around the one compensation pixel circuit.

15. A display device, comprising the display panel of claim 10.

16. A regional compensation method, comprising:

receiving a gate voltage of a driving transistor acquired by a signal acquiring circuit in a compensation pixel circuit; and

compensating non-compensation pixel circuits in accordance with the gate voltage of the driving transistor,

wherein compensating the non-compensation pixel circuits in accordance with the gate voltage of the driving transistor comprises;

receiving a light-emitting data signal received by the compensation driving circuit;

subtracting a light-emitting voltage in the light-emitting data signal received by the compensation driving circuit from the gate voltage of the driving transistor to get a threshold voltage of the driving transistor,

receiving light-emitting data signals for the non-compensation pixel circuits;

adding the threshold voltage to light-emitting voltages of the light-emitting data signals for the non-compensation pixel circuits to get light-emitting voltages of updated light-emitting data signals for the non-compensation pixel circuits, and

sending the light-emitting voltages of the updated light-emitting data signals to the non-compensation pixel circuits.

17. A compensation pixel circuit, comprising:

a compensation driving circuit, comprising a driving transistor and an organic light-emitting diode, wherein the compensation driving circuit is configured to receive a light-emitting data signal, compensate a threshold voltage of the driving transistor, and drive the organic light-emitting diode to illuminate in accordance with the light-emitting data signal;

a signal acquiring circuit connected with the compensation driving circuit and configured to acquire a gate voltage of the driving transistor; and

a compensation controller, configured to receive the gate voltage of the driving transistor acquired by the signal acquiring circuit,

wherein the compensation controller is further configured to;

receive the light-emitting data signal received by the compensation driving circuit,

subtract a light-emitting voltage in the light-emitting data signal received by the compensation driving circuit from the gate voltage of the driving transistor to obtain the threshold voltage of the driving transistor.