Display panel, display device, pixel driving circuit, and control method for the same

Patent metadata

Field	Value
Publication number	US-10453387-B2
Application number	US-201815865186-A
Country	US
Kind code	B2
Filing date	Jan 8, 2018
Priority date	Aug 18, 2017
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A display panel, a display device, a pixel driving circuit, and a control method for the pixel driving circuit. The pixel driving circuit includes a data writing module for transmitting signal of the data signal end to the first node in response to enable signal of the first control signal end; a coupling writing module for transmitting signal of the first power source voltage end to the first node in response to enable signal of the second control signal end; a storage capacitor; a driving transistor; a first switch unit; a second switch unit; a reset module for transmitting signal of the reset signal line to the fourth node in response to enable signal of the fifth control signal end; and a light emitting element, an anode thereof being electrically connected to the fourth node, an cathode thereof being electrically connected to a second power source voltage end.

First claim

What is claimed is:

1. A display panel, comprising a pixel driving circuit, wherein the pixel driving circuit comprises:
a first switch transistor, a first end of the first switch transistor being electrically connected to a data signal end, a second end of the first switch transistor being electrically connected to a first node, and a control end of the first switch transistor being electrically connected to a first control signal end, and the first switch transistor being-used for transmitting a signal of the data signal end to the first node in response to an enable signal of the first control signal end;
a second switch transistor, a first end of the second switch transistor being electrically connected to a first power source voltage end, a second end of the second switch transistor being electrically connected to the first node, and a control end of the second switch transistor being electrically connected to a second control signal end, and the second switch transistor being-used for transmitting a signal of the first power source voltage end to the first node in response to an enable signal of the second control signal end;
a storage capacitor, a first end of the storage capacitor being electrically connected to the first node, a second end of the storage capacitor being electrically connected to a second node;
a driving transistor, a first end of the driving transistor being electrically connected to the first power source voltage end, a second end of the driving transistor being electrically connected to a third node, a control end of the driving transistor being electrically connected to the second node;
a third switch transistor, a first end of the third switch transistor being electrically connected to the second node, a second end of the third switch transistor being electrically connected to the third node, a control end of the third switch transistor being electrically connected to a third control signal end;
a fourth switch transistor, a first end of the fourth switch transistor being electrically connected to the third node, a second end of the fourth switch transistor being electrically connected to a fourth node, a control end of the fourth switch transistor being electrically connected to a fourth control signal end;
a fifth switch transistor, a first end of the fifth switch transistor being electrically connected to a reset signal line, a second end of the fifth switch transistor being electrically connected to the fourth node, and a control end of the fifth switch transistor being electrically connected to a fifth control signal end, and the fifth switch transistor being used for transmitting a signal of the reset signal line to the fourth node in response to an enable signal of the fifth control signal end;
a light emitting element, an anode of the light emitting element being electrically connected to the fourth node, a cathode of the light emitting element being electrically connected to a second power source voltage end; and
a sixth switch transistor, the first end of the driving transistor being electrically connected to the first power source voltage end by the sixth switch transistor, a first end of the sixth switch transistor being electrically connected to the first power source voltage end, a second end of the sixth switch transistor being electrically connected to the first end of the driving transistor, and a control end of the sixth switch transistor being electrically connected to a sixth control signal end,
wherein a non-enable signal is provided to the first control signal end and the sixth control signal end, and an enable signal is provided to the second control signal end, the third control signal end, the fourth control signal end and the fifth control signal end in a first stage, so that the signal of the first power source voltage end is transmitted to the first node and the signal of the reset signal line is transmitted to the fourth node, the third node and the second node;
a non-enable signal is provided to the second control signal end and the fourth control signal end, and an enable signal is provided to the first control signal end, the third control signal end, the fifth control signal end and the sixth control signal end in a second stage, so that the signal of the data signal end is transmitted to the first node, a threshold compensation is performed to the second node by the first power source voltage end, and the signal of the reset signal line is transmitted to the fourth node; and
a non-enable signal is provided to the first control signal end, the third control signal end and the fifth control signal end, and providing an enable signal to the second control signal end, the fourth control signal end and the sixth control signal end in a third stage, so that the signal of the first power source voltage end is transmitted to the first node and a conduction path between the first power source voltage end and the second power source voltage end is formed.

2. The display panel according to claim 1 , wherein the light emitting element of the pixel driving circuit comprises an anode layer, a light emitting layer and a cathode layer, and the anode layer, the light emitting layer and the cathode layer are sequentially placed;
each transistor in the pixel driving circuit comprises a source electrode, a drain electrode, a gate electrode and an active layer;
the storage capacitor comprises a first electrode plate and a second electrode plate; and
the gate electrode and the second electrode plate are placed in a first metallic layer, the first electrode plate is placed in a second metallic layer, the source electrode and the drain electrode are placed in a third metallic layer, and the third metallic layer, the second metallic layer, the first metallic layer and the active layer are sequentially placed on a side of the anode layer away from the cathode layer.

3. The display panel according to claim 1 , wherein the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor and the sixth switch transistor are P-type transistors.

4. The display panel according to claim 1 , wherein the light emitting element is an organic light-emitting diode.

5. The display panel according to claim 1 , wherein the third switch transistor is a multi-gate structure.

6. The display panel according to claim 1 , wherein a width-length ratio of a channel of the driving transistor is smaller than 1.

7. A control method for a pixel driving circuit, the pixel driving circuit comprising:
a first switch transistor, a first end of the first switch transistor being electrically connected to a data signal end, a second end of the first switch transistor being electrically connected to a first node, and a control end of the first switch transistor being electrically connected to a first control signal end, and the first switch transistor being used for transmitting a signal of the data signal end to the first node in response to an enable signal of the first control signal end;
a second switch transistor, a first end of the second switch transistor being electrically connected to a first power source voltage end, a second end of the second switch transistor being electrically connected to the first node, and a control end of the second switch transistor being electrically connected to a second control signal end, and the second switch transistor being used for transmitting a signal of the first power source voltage end to the first node in response to an enable signal of the second control signal end;
a storage capacitor, a first end of the storage capacitor being electrically connected to the first node, a second end of the storage capacitor being electrically connected to a second n

Assignees

• Shanghai Tianma Micro Elect Co

Inventors

• Zhou Xingyao
• Tseng Chang-Ho
• Li Yuan

Classifications

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G3/3241

  the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror · CPC title

• G09G2320/045

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

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title