Pixel driving circuit, array substrate and display apparatus

Patent metadata

Field	Value
Publication number	US-10276098-B2
Application number	US-201515116624-A
Country	US
Kind code	B2
Filing date	Oct 30, 2015
Priority date	Jun 10, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

There are provided in the present disclosure a pixel driving circuit, an array substrate and a display apparatus. The pixel driving circuit comprises: a compensation module (11), a control module (12), a driving modeling (13), and a light emitting module (14), wherein: the compensation module (11) is connected to a scan signal (Scan), a data signal (Vdata) and a reference signal (VREF) and further connected to the control module (12) and the drive module (13), and is configured to receive the data signal (Vdata) and the reference signal (VREF) under the control of the scan signal (Scan) and compensate for a threshold voltage of the drive module (13) under the control of the control module (12); the control module (12) is connected to a light emitting control signal (EM) and a power supply signal (ELVDD) and further connected to the drive module (13) and the light emitting module (14), and is configured to receive the power supply signal (ELVDD) under the control of the light emitting control signal (EM) to control the compensation module (11) to compensate for the threshold voltage of the drive module (13); one terminal of the light emitting module (14) is connected to the drive module (13), and the other terminal thereof is grounded (VSS); and; the drive module (13) is configured to drive the light emitting module (14) to emit light under the control of the control module (12). The pixel driving circuit is capable of avoiding non-uniformity of luminance of the display device, and enhancing the display effect of the display device.

First claim

What is claimed is:

1. A pixel driving circuit, comprising: a compensation module, a control module, a driving modeling, and a light emitting module, wherein:
the compensation module is connected with a scan signal, a data signal and a reference signal and further connected to the control module and the drive module, and is configured to receive the data signal and the reference signal under the control of the scan signal and compensate for a threshold voltage of the drive module under the control of the control module, wherein the compensation module comprises:
a first transistor, whose gate is connected to the scan signal, first electrode is connected to the data signal, and second electrode is connected to the control module;
a second transistor, whose gate is connected to the scan signal, first electrode is connected to the reference signal, and second electrode is connected to a second terminal of a first capacitor;
the first capacitor, whose first terminal is connected to the second electrode of the first transistor;
a second capacitor, whose first terminal is connected to the second electrode of the second transistor and the first terminal of the first capacitor, and second terminal is connected to a second electrode of a third transistor; and
the third transistor, whose gate is connected to the scan signal, first electrode is connected to the control module and the drive module, and second electrode is connected to the drive module;
the control module is connected with a light emitting control signal different from the scan signal and a power supply signal and further connected to the drive module and the light emitting module, and is configured to receive the power supply signal under the control of the light emitting control signal and control the compensation module to compensate for the threshold voltage of the drive module;
one terminal of the light emitting module is connected to the drive module, and the other terminal thereof is connected to a ground; and
the drive module is configured to drive the light emitting module to emit light under the control of the control module,
wherein compensating for the threshold voltage of the drive module comprising:
in a resetting phase, both the scan signal and the light emitting control signal being at a high level;
in a compensating phase, the scan signal being at the high level, and the light emitting control signal being at a low level; and
in a light emitting phase, the scan signal being at the low level, and the light emitting control signal being at the high level.

2. The pixel driving circuit according to claim 1 , wherein the control module comprises:
a fourth transistor, whose gate is connected to the light emitting control signal, first electrode is connected to the power supply signal, and second electrode is connected to the drive module and the compensation module; and
a sixth transistor, whose gate is connected to the light emitting control signal, first electrode is connected to the compensation module, and second electrode is connected to the drive module and the light emitting module.

3. The pixel driving circuit according to claim 1 , wherein the drive module comprises: a fifth transistor, wherein:
a gate of the fifth transistor is connected to the compensation module, a first electrode thereof is connected to the compensation module and the control module, and a second electrode thereof is connected to the control module and the light emitting module.

4. The pixel driving circuit according to claim 1 , wherein the light emitting module comprises: an organic light emitting diode, wherein:
one terminal of the organic light emitting diode is connected to the control module and the drive module, and another terminal thereof is grounded.

5. The pixel driving circuit according to claim 1 , wherein the first transistor, the second transistor and the third transistor are N-type transistors simultaneously or P-type transistors simultaneously.

6. The pixel driving circuit according to claim 2 , wherein the fourth transistor and the sixth transistor are N-type transistors simultaneously or P-type transistors simultaneously.

7. The pixel driving circuit according to claim 3 , wherein the fifth transistor is the N-type transistor.

8. An array substrate, comprising the pixel driving circuit according to claim 1 .

9. A display apparatus, comprising the array substrate according to claim 8 .

10. The array substrate according to claim 8 , wherein the compensation module comprises:
a first transistor, whose gate is connected to the scan signal, first electrode is connected to the data signal, and second electrode is connected to the control module;
a second transistor, whose gate is connected to the scan signal, first electrode is connected to the reference signal, and second electrode is connected to a second terminal of a first capacitor;
the first capacitor, whose first terminal is connected to the second electrode of the first transistor;
a second capacitor, whose first terminal is connected to the second electrode of the second transistor, and second terminal is connected to a second electrode of a third transistor; and
the third transistor, whose gate is connected to the scan signal, first electrode is connected to the control module and the drive module, and second electrode is connected to the drive module.

11. The array substrate according to claim 8 , wherein the control module comprises:
a fourth transistor, whose gate is connected to the light emitting control signal, first electrode is connected to the power supply signal, and second electrode is connected to the drive module and the compensation module; and
a sixth transistor, whose gate is connected to the light emitting control signal, first electrode is connected to the compensation module, and second electrode is connected to the drive module and the light emitting module.

12. The array substrate according to claim 8 , wherein the drive module comprises: a fifth transistor, wherein:
a gate of the fifth transistor is connected to the compensation module, a first electrode thereof is connected to the compensation module and the control module, and a second electrode thereof is connected to the control module and the light emitting module.

13. The array substrate according to claim 8 , wherein the light emitting module comprises: an organic light emitting diode, wherein:
one terminal of the organic light emitting diode is connected to the control module and the drive module, and another terminal thereof is grounded.

14. The array substrate according to claim 10 , wherein the first transistor, the second transistor and the third transistor are N-type transistors simultaneously or P-type transistors simultaneously.

15. The array substrate according to claim 11 , wherein the fourth transistor and the sixth transistor are N-type transistors simultaneously or P-type transistors simultaneously.

16. The array substrate according to claim 12 , wherein the fifth transistor is the N-type transistor.

17. The display apparatus according to claim 9 , wherein the compensation module comprises:
a first transistor, whose gate is connected to the scan signal, first electrode is connected to the data signal, and second electrode is connected to the control module;
a second transistor, whose gate is connected to the scan signal, first electrode is connected to the reference signal, and second electrode is connected to a second terminal of a first capacitor;
the first capacitor, whose first terminal is connected to the second electrode of the

Assignees

• Boe Technology Group Co Ltd

Inventors

• Gai Cuili
• Cao Kun
• Zhang Baoxia
• Li Yongqian
• Li Quanhu
• Wang Longyan
• Yin Jingwen

Classifications

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G09G3/3291

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• H01L27/3276

  Electricity · mapped topic

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G2300/0861

  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 title