Pixel driving circuit, pixel driving method and display apparatus

Patent metadata

Field	Value
Publication number	US-11094257-B2
Application number	US-201816328936-A
Country	US
Kind code	B2
Filing date	Jun 22, 2018
Priority date	Sep 21, 2017
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

The embodiments of the present disclosure disclose a pixel driving circuit, a pixel driving method and a display apparatus. A pixel driving circuit for driving a light emitting element, comprising: a first control sub-circuit providing a data signal terminal signal to a first node based on a first signal control terminal signal; a second control sub-circuit providing a first power source terminal signal to a fourth node based on a third signal control terminal signal, and a signal of the fourth node to a second node based on a second signal control terminal signal; a third control sub-circuit providing a second power source terminal signal to a third node based on a fourth signal control terminal signal; an energy storage sub-circuit storing a potential difference between the first node and the second node; and a driving sub-circuit transmitting a driving current for driving the light-emitting element.

First claim

What is claimed is:

1. A pixel driving circuit for driving a light emitting element, comprising:
a first controller configured to provide a signal of a data signal terminal to a first node under the control of a first signal control terminal;
a second controller configured to provide a signal of a first power source terminal to a fourth node under the control of a third signal control terminal, and to provide a signal of the fourth node to a second node under the control of a second signal control terminal;
a third controller configured to provide a signal of a second power source terminal to a third node under the control of a fourth signal control terminal, so that the light emitting element is short circuited in a threshold detection stage;
an energy storage configured to store a potential difference between the first node and the second node; and
a driver configured to transmit a driving current for driving the light emitting element from a fourth node to the third node under the control of the second node,
wherein in a resetting stage, an input signal of the first signal control terminal, an input signal of the second signal control terminal, an input signal of the third signal control terminal, and an input signal of the fourth signal control terminal are all at a high level; in the threshold detection stage, the input signal of the first signal control terminal, the input signal of the second signal control terminal and the input signal of the fourth signal control terminal are all at the high level; in a writing stage, the input signal of the first signal control terminal and the input signal of the data signal terminal are both at the high level; in a light emitting stage, the input signal of the third signal control terminal is at the high level.

2. The pixel driving circuit of claim 1 , wherein the first controller comprises:
a first switching transistor, and
a gate electrode of the first switching transistor is connected to the first signal control terminal, a first electrode of the first switching transistor is connected to the data signal terminal, and a second electrode of the first switching transistor is connected to the first node.

3. The pixel driving circuit of claim 2 , wherein the second controller comprises:
a second switching transistor and a third switching transistor,
a gate electrode of the second switching transistor is connected to the second signal control terminal, a first electrode of the second switching transistor is connected to the second node, and a second electrode of the second switching transistor is connected to the fourth node, and
a gate electrode of the third switching transistor is connected to the third signal control terminal, a first electrode of the third switching transistor is connected to the first power source terminal, and a second electrode of the third switching transistor is connected to the fourth node.

4. The pixel driving circuit of claim 3 , wherein the third controller comprises:
a fourth switching transistor, and
a gate electrode of the fourth switching transistor is connected to the fourth signal control terminal, a first electrode of the fourth switching transistor is connected to the third node, and a second electrode of the fourth switching transistor is connected to the second power source terminal.

5. The pixel driving circuit of claim 4 , wherein the energy storage comprises:
a capacitor, and
one terminal of the capacitor is connected to the first node, and another terminal of the capacitor is connected to the second node.

6. The pixel driving circuit of claim 5 , wherein the driver comprises:
a driving transistor, and
a gate electrode of the driving transistor is connected to the second node, a source electrode of the driving transistor is connected to the third node, and a drain electrode of the driving transistor is connected to the fourth node.

7. The pixel driving circuit of claim 6 , wherein the capacitor is configured to adjust a potential of the second node by discharging until the potential of the second node is equal to a threshold voltage of the driving transistor.

8. The pixel driving circuit according to claim 6 , wherein the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, and the driving transistor are all N-type thin film transistors or P-type thin film transistors.

9. The pixel driving circuit according to claim 1 , wherein the light emitting element is an organic light emitting diode.

10. A display apparatus comprising the pixel driving circuit according to claim 1 .

11. A pixel driving method for a pixel driving circuit according to claim 1 , comprising:
in a reset stage, the first controller providing the signal of the data signal terminal to the first node under the control of the first signal control terminal; the second controller providing the signal of the first power source terminal to the fourth node under the control of the third signal control terminal, and providing the signal of the fourth node to the second node under the control of the third signal control terminal; the third controller providing the signal of the second power source terminal to the third node under the control of the fourth signal control terminal;
in the threshold detection stage, the third controller providing the signal of the second power source terminal to the third node under the control of the fourth signal control terminal; and detecting a threshold voltage of the driver under an action of the energy storage;
in a writing stage, the first controller providing the signal of the data signal terminal to the first node under the control of the first signal control terminal; and
in a light emitting stage, the second controller providing the signal of the first power source terminal to the fourth node according to the control of the third signal control terminal, and the driver providing the driving current for driving the light emitting element from the fourth node to the third node under the control of the second node.

12. The method of claim 11 , wherein the step of detecting the threshold voltage of the driver under the action of the energy storage comprises:
the energy storage adjusts a potential of the second node by discharging until the potential of the second node is equal to the threshold voltage of a driving transistor in the driver.

13. The method of claim 12 , wherein in the threshold detection stage, the potential of the fourth node is equal to the potential of the second node.

Assignees

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

Inventors

• Hu Qi
• Jing Hui
• Liao Weijing

Classifications

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G3/325 Primary

  the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver · CPC title

• G09G2310/0262

  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 title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2300/0819

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