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

Patent metadata

Field	Value
Publication number	US-2016189604-A1
Application number	US-201514594317-A
Country	US
Kind code	A1
Filing date	Jan 12, 2015
Priority date	Dec 29, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

There is provided a pixel driving circuit, a driving method, an array substrate and a display device. The pixel driving circuit comprises: a first switching unit, being turned on or off according to a first scanning signal to control a transmission of a data signal; a first charging unit, having first terminal connected to a second terminal of the first switching unit; a first driving unit, having control terminal connected to a second terminal of the first charging unit, first terminal connected to a first power supply, and second terminal connected to a second power supply; a first driving compensation unit, for producing a predetermined voltage at the control terminal of the first driving unit, so that a current flowing through the light-emitting device is independent of threshold voltage of the first driving unit. Accordingly, the threshold voltage is prevented from affecting light-emitting luminance, luminance uniformity is ensured.

First claim

What is claimed is:

1 . A pixel driving circuit comprising a first driving component, the first driving component comprising:
a first switching unit, having a control terminal and a first terminal which are connected to a first scanning control line and a first data line respectively, and being configured to be turned on or turned off according to a first scanning signal in the first scanning control line to control a transmission of a data signal in the first data line; a first charging unit, having a first terminal which is connected to a second terminal of the first switching unit; a first driving unit, having a control terminal connected to a second terminal of the first charging unit, a first terminal connected to a first power supply through the light-emitting device, and a second terminal connected to a second power supply, a voltage of the first power supply being greater than a voltage of the second power supply, and the first driving unit being disabled when a voltage at the control terminal of the first driving unit is smaller than a threshold voltage; and a first driving compensation unit, connected to the control terminal of the first driving unit and configured to produce a predetermined voltage at the control terminal of the first driving unit when the first scanning signal in the first scanning control line turns on the first switching unit, so that, after a data signal that enables to emit light is received from the first data line, a current flowing through the light-emitting device is independent of the threshold voltage of the first driving unit by means of the predetermined voltage.

2 . The pixel driving circuit according to claim 1 , wherein the first driving compensation unit comprises:
a first transistor, having a strobe electrode connected to the first scanning control line, a first electrode and a second electrode which are connected to a first terminal and a second terminal of the light-emitting device respectively; a second transistor, having strobe electrode connected to a first control line, a first electrode connected to the second terminal of the light-emitting device, and a second electrode connected to a first electrode of the first driving unit; and a third transistor, having a strobe electrode connected to a second control line, a first electrode connected to a second terminal of the second transistor, and a second electrode connected to the control terminal of the first driving unit.

3 . The pixel driving circuit according to claim 1 , wherein the first switching unit comprises a first switching transistor, first switching transistor having a strobe electrode connected to the first scanning control line, a first electrode connected to the first data line, and a second electrode connected to the first terminal of the first charging unit.

4 . The pixel driving circuit according to claim 1 , wherein the first driving unit comprises a first driving transistor, the first driving transistor having a strobe electrode connected to a second terminal of the first charging unit, a first electrode connected to the first power supply through the light-emitting device, and a second electrode connected to the second power supply.

5 . The pixel driving circuit according to claim 2 , wherein the pixel driving circuit further comprises a second driving component and a switch-over unit, the second driving component comprising:
a second switching unit, having a control terminal and a first terminal which are connected to a second scanning control line and a second data line respectively and being configured to be turned on or turned off according to a second scanning signal in the second scanning control line to control a transmission of the data signal of the second data line; a second charging unit, having a first terminal connected to a second terminal of the second switching unit; a second driving unit, having a control terminal connected to a second terminal of the second charging unit, first terminal connected to the first power supply via the light-emitting device, and a second terminal connected to the second power supply; and a second driving compensation unit, connected to the control terminal of the second driving unit, for producing a predetermined voltage at the control terminal of the second driving unit when the second scanning signal in the second scanning control line turns on the second switching unit, so that, after a data signal that enables to emit light is received from the second data line, the current flowing through the light-emitting device is independent of the threshold voltage of the second driving unit by means of the predetermined voltage; the switch-over unit being connected to the first driving component and the second driving component and configured to select one of the first driving component and the second driving component to drive the light-emitting device to emit light.

6 . The pixel driving circuit according to claim 5 , wherein the second driving compensation unit comprises:
a fourth transistor, having a strobe electrode connected to the second scanning control line, a first electrode and second electrode which are connected to the first terminal and the second terminal of the light-emitting device respectively; and a fifth transistor, having a strobe electrode connected to a third control line, a first electrode connected to the second terminal of the second transistor, and a second electrode connected to the control terminal of the second driving unit, wherein the second driving component and the second transistor cooperate to drive the light-emitting device.

7 . The pixel driving circuit according to claim 6 , wherein the switch-over unit comprises:
a first switch-over transistor, having a strobe electrode connected to a first switch-over control line, a first electrode connected to the strobe electrode of the first driving transistor, and a second electrode connected to the second power supply; and a second switch-over transistor, having a strobe electrode connected to a second switch-over control line, a first electrode connected to a strobe electrode of the second driving transistor, and a second electrode connected to the second power supply.

8 . The pixel driving circuit according to claim 6 , wherein the first driving component drives the light-emitting device to emit light in an odd frame period, and the second driving component drives the light-emitting device to emit light in an even frame period,
in the odd frame period, the first switch-over transistor is turned off under a driving of a first switch-over control signal in the first switch-over control line, and the second switch-over transistor is turned on under a driving of the second switch-over control signal in the second switch control line to disable the second driving transistor; and in the even frame period, the first switch-over transistor is turned on under a driving of a first switch-over control signal in the first switch-over control line, and the second switch-over transistor is turned off under a driving of the second switch-over control signal in the second switch control line to disable the first driving transistor.

9 . A driving method for a pixel driving circuit, the pixel driving circuit is used for driving a light-emitting device and comprising a first driving component, the first driving component comprising a first switching unit, a first charging unit, a first driving unit and a first driving compensation unit, the first switching unit having a control terminal connected to a first scanning control line, a first terminal connected to a first data line, and a second terminal connected to a first terminal of the first charging unit, the first driving unit having a c

Assignees

• Boe Technology Group Co Ltd
• Hefei Xinsheng Optoelectronics Technology Co Ltd

Inventors

• Hu Zuquan

Classifications

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G2300/0814

  used for selection purposes, e.g. logical AND for partial update · CPC title

• G09G2320/045

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