Driving method for pixel driving circuit, display panel and display device

Patent metadata

Field	Value
Publication number	US-10657888-B2
Application number	US-201815966129-A
Country	US
Kind code	B2
Filing date	Apr 30, 2018
Priority date	Feb 27, 2018
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A driving method for a pixel driving circuit comprising a driving transistor and a light-emitting element is provided. The driving method comprises: in response to a first scanning signal on a first scanning signal line, performing initialization of the pixel driving circuit; in response to a second scanning signal on a second scanning signal line and the first scanning signal on the first scanning signal line, compensating threshold voltage deviation of the driving transistor and providing a data signal voltage; in response to a first light-emitting signal on a first light-emitting signal line and a second light-emitting signal on a second light-emitting signal line, generating, by the driving transistor, driving current corresponding to the data signal voltage; and in response to the driving current, emitting light by the light-emitting element. At least one clock signal period is provided after initialization is completed and before the threshold voltage deviation is compensated.

First claim

What is claimed is:

1. A driving method for a pixel driving circuit comprising a driving transistor and a light-emitting element, comprising:
in response to a first scanning signal on a first scanning signal line, performing an initialization of the pixel driving circuit, wherein the first scanning signal is a low-level signal;
in response to a second scanning signal on a second scanning signal line and a third scanning signal on the first scanning signal line, compensating a threshold voltage deviation of the driving transistor, and providing a data signal voltage, wherein the third scanning signal is a low-level signal;
in response to a first light-emitting signal on a first light-emitting signal line and a second light-emitting signal on a second light-emitting signal line, generating, by the driving transistor, driving current corresponding to the data signal voltage; and
in response to the driving current, emitting light by the light-emitting element,
wherein at least one clock signal period is provided after the initialization of the pixel driving circuit is completed and before the threshold voltage deviation of the driving transistor is compensated, and
in the at least one clock signal period, a high-level is provided to the first scanning signal line, and a signal provided to the first light-emitting signal line is changed from a high-level to a low-level.

2. The driving method according to claim 1 , wherein:
two one clock signal periods are provided after the initialization of the pixel driving circuit is completed and before the threshold voltage deviation of the driving transistor is compensated.

3. The driving method according to claim 1 , wherein:
the first scanning signal line provides two adjacent scanning signals, and the two adjacent signals are separated by the at least one clock signal period.

4. The driving method according to claim 1 , wherein:
during the at least one clock signal period, the first light-emitting signal line at least outputs a low-level light-emitting signal.

5. The driving method according to claim 1 , wherein:
the first light-emitting signal on the first light-emitting signal line has a duty cycle of approximately 25%, and
the second light-emitting signal on the second light-emitting signal line has a duty cycle of approximately 25%.

6. A driving method for a pixel driving circuit comprising a driving transistor, a light-emitting element, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, and a sixth transistor, wherein:
a gate electrode of the first transistor is electrically connected to a first light-emitting signal line, a first electrode of the first transistor is electrically connected to a first voltage signal line, and a second electrode of the first transistor is electrically connected to a first electrode of the driving transistor;
a gate electrode of the second transistor is electrically connected to a second light-emitting signal line, a first electrode the second transistor is electrically connected to the first voltage signal line, and a second electrode the second transistor is electrically connected to a second node;
a gate electrode of the driving transistor is electrically connected to a first node, and the second node is electrically connected to a third node;
a gate electrode of the third transistor is electrically connected to a first scanning signal line, a first electrode of the third transistor is electrically connected to the first node, and a second electrode of the third transistor is electrically connected to the third node;
a gate electrode of the fourth transistor is electrically connected to a second scanning signal line, a first electrode of the fourth transistor is electrically connected to a data signal line, and a second electrode of the fourth transistor is electrically connected to the second node;
a gate electrode of the fifth transistor is electrically connected to the second light-emitting signal line, 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 the light-emitting element; and
a gate electrode of the sixth transistor is electrically connected to a first scanning signal line, a first electrode of the sixth transistor is electrically connected to an initialization signal line, and a second electrode of the sixth transistor is electrically connected to the light-emitting element,
wherein the driving method comprises:
in response to a first scanning signal on the first scanning signal line, performing an initialization of the pixel driving circuit, wherein the first scanning signal is a low-level signal;
in response to a second scanning signal on the second scanning signal line and a third scanning signal on the first scanning signal line, compensating a threshold voltage deviation of the driving transistor, and providing a data signal voltage, wherein the third scanning signal is a low-level signal;
in response to a first light-emitting signal on the first light-emitting signal line and a second light-emitting signal on the second light-emitting signal line, generating, by the driving transistor, driving current corresponding to the data signal voltage; and
in response to the driving current, emitting light by the light-emitting element,
wherein at least one clock signal period is provided after the initialization of the pixel driving circuit is completed and before the threshold voltage deviation of the driving transistor is compensated, and
in the at least one clock signal period, a high-level is provided to the first scanning signal line, and a signal provided to the first light-emitting signal line is changed from a high-level to a low-level.

7. The driving method according to claim 6 , wherein:
two one clock signal periods are provided after the initialization of the pixel driving circuit is completed and before the threshold voltage deviation of the driving transistor is compensated.

8. The driving method according to claim 6 , wherein:
the first scanning signal line provides two adjacent scanning signals, and the two adjacent signals are separated by the at least one clock signal period.

9. The driving method according to claim 6 , wherein:
during the at least one clock signal period, the first light-emitting signal line at least outputs a low-level light-emitting signal.

10. The driving method according to claim 6 , wherein:
the first light-emitting signal on the first light-emitting signal line has a duty cycle of approximately 25%, and
the second light-emitting signal on the second light-emitting signal line has a duty cycle of approximately 25%.

11. A display panel comprising a plurality of pixel driving circuits, wherein a pixel driving circuit of the plurality of pixel driving circuits comprises a driving transistor and a light-emitting element, and is driven by a driving method comprising: in response to a first scanning signal on a first scanning signal line, performing an initialization of the pixel driving circuit, the first scanning signal being a low-level signal; in response to a second scanning signal on a second scanning signal line and a third scanning signal on the first scanning signal line, compensating a threshold voltage deviation of the driving transistor, and providing a data signal voltage, the third scanning signal being a low-level signal; in response to a first light-emitting signal on a first light-emitting signal line and a second light-emitting signal on a second light-emitting signal line, generating, by the driving transistor, driving current corresponding to the data signal volta

Assignees

• Shanghai Tianma Am Oled Co Ltd

Inventors

• Gao Yana
• Zhou Xingyao
• Li Yue
• Tseng Chang-Ho
• Li Yuan

Classifications

• 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

• 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

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G3/30

  using electroluminescent panels · CPC title

• G09G3/3233 Primary

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