Organic light-emitting pixel driving circuit, driving method and organic light-emitting display device

Patent metadata

Field	Value
Publication number	US-10056034-B2
Application number	US-201715619510-A
Country	US
Kind code	B2
Filing date	Jun 11, 2017
Priority date	Jan 23, 2017
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

The present disclosure discloses an organic light-emitting pixel driving circuit, driving method and an organic light-emitting display panel. A driving transistor is to generate a driving current, a light-emitting element is to emit light; a first transistor is to transmit a first initialization voltage to the light-emitting element; a second transistor is to transmit a second initialization voltage to the driving transistor; a third transistor is to transmit a data signal voltage to the pixel driving circuit; a fourth transistor is to transmit a reference voltage to the driving circuit; a first capacitor is coupled in series between the output terminal of the third transistor and the driving transistor; a fifth transistor is to control the first capacitor; a sixth transistor is to control light emission of the light-emitting element; a second capacitor is to maintain the charge amount between the gate and source of the driving transistor.

First claim

What is claimed is:

1. An organic light-emitting pixel driving circuit, comprising:
a driving transistor and a light-emitting element, wherein the driving transistor is configured to generate a driving current enabling the light-emitting element to emit light, wherein the light-emitting element is configured to emit light in response to the driving current;
a first transistor configured to transmit a first initialization voltage on a first initialization signal line to the light-emitting element in response to a signal input to a gate of the first transistor;
a second transistor configured to transmit a second initialization voltage to the driving transistor in response to a signal input to a gate of the second transistor;
a third transistor configured to transmit a data signal voltage on a data signal line to the organic light-emitting pixel driving circuit in response to a signal input to a gate of the third transistor;
a fourth transistor configured to transmit a reference voltage to the organic light-emitting pixel driving circuit in response to a signal input to a gate of the fourth transistor, wherein an output terminal of the third transistor and an output terminal of the fourth transistor are connected with each other;
a first capacitor coupled in series between the output terminal of the third transistor and the driving transistor;
a fifth transistor disposed between the first capacitor and the driving transistor and configured to control the first capacitor to couple own charges of the first capacitor to the driving transistor in response to a signal input to a gate of the fifth transistor;
a sixth transistor configured to control a light emission process of the light-emitting element in response to a signal input to a gate of the sixth transistor; and
a second capacitor coupled in series between a gate and source of the driving transistor, and configured to store an amount of charges between the gate and source of the driving transistor.

2. The organic light-emitting pixel driving circuit according to claim 1 , further comprising a first power supply voltage signal line outputting a first power supply voltage,
wherein the second initialization voltage equals to the output of the first power supply voltage from the first power supply voltage signal line.

3. The organic light-emitting pixel driving circuit according to claim 2 , wherein the first capacitor is coupled in series between the output terminal of the third transistor and the gate of driving transistor.

4. The organic light-emitting pixel driving circuit according to claim 3 , further comprising:
a reference voltage line, a first scanning signal line, a second scanning signal line, a first light emission controlling signal line, a second light emission controlling signal line and a second power supply voltage signal line,
wherein the reference voltage line outputs a reference voltage;
wherein a first electrode of the first transistor is electrically connected with the first initialization signal line, a second electrode of the first transistor is electrically connected with an anode of the light-emitting element, and the gate of the first transistor is electrically connected with the first scanning signal line;
wherein a first electrode of the second transistor is electrically connected with a drain of the driving transistor, a second electrode of the second transistor is electrically connected with the gate of the driving transistor, and the gate of the second transistor is electrically connected with the second scanning signal line;
wherein a first electrode of the third transistor is electrically connected with the data line, a second electrode of the third transistor is electrically connected with a first electrode of the first capacitor, and the gate of the third transistor is electrically connected with the second scanning signal line;
wherein a first electrode of the fourth transistor is electrically connected with the reference voltage line, a second electrode of the fourth transistor is electrically connected with the first electrode of the first capacitor, and the gate of the fourth transistor is electrically connected with first light emission controlling signal line,
wherein a first electrode of the fifth transistor is electrically connected with the second electrode of the first capacitor, a second electrode of the fifth transistor is electrically connected with the gate of the driving transistor, and the gate of the fifth transistor is electrically connected with the first scanning signal line;
wherein a first electrode of the sixth transistor is electrically connected with the first power supply voltage signal line, a second electrode of the sixth transistor is electrically connected with the drain of the driving transistor, and the gate of the sixth transistor is electrically connected with the second light emission controlling signal line;
wherein a first electrode of the second capacitor is electrically connected with the gate of the driving transistor, and a second electrode of the second capacitor is electrically connected with the source of the driving transistor; and
wherein the anode of the light-emitting element is electrically connected with the source of the driving transistor, and a cathode of the light-emitting element is electrically connected with the second power supply voltage signal line.

5. The organic light-emitting pixel driving circuit according to claim 4 , wherein the first initialization signal line is multiplexed as the reference voltage line, and the reference voltage is the first initialization voltage.

6. The organic light-emitting pixel driving circuit according to claim 1 , wherein the reference voltage line outputs the reference voltage;
wherein the second initialization voltage provides the reference voltage output from the reference voltage line.

7. The organic light-emitting pixel driving circuit according to claim 6 , wherein the first capacitor is coupled in series between the output terminal of the third transistor and the source of the driving transistor.

8. The organic light-emitting pixel driving circuit according to claim 7 , further comprising: a reference voltage line, a first scanning signal line, a second scanning signal line, a third scanning signal line, a first light emission controlling signal line, a second light emission controlling signal line and a second power supply voltage signal line, wherein
the reference voltage line outputs the reference voltage;
wherein a first electrode of the first transistor is electrically connected with the first initialization signal line, a second electrode of the first transistor is electrically connected with an anode of the light-emitting element, and the gate of the first transistor is electrically connected with the second scanning signal line;
wherein a first electrode of the second transistor is electrically connected with the reference voltage line, a second electrode of the second transistor is electrically connected with the gate of the driving transistor, and the gate of the second transistor is electrically connected with the first scanning signal line;
wherein a first electrode of the third transistor is electrically connected with the data line, a second electrode of the third transistor is electrically connected with a first electrode of the first capacitor, and the gate of the third transistor is electrically connected with the third scanning signal line;
wherein a first electrode of the fourth transistor is electrically connected with the reference voltage line, a second electrode of the fourth transistor is electrically connected with the first electrode of the first capacitor, and the gate of the fourth transistor is electrically connected with first

Assignees

• Shanghai Tianma Am Oled Co Ltd

Inventors

• Zhu Renyuan
• Chen Zeyuan

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

• G09G2300/0819

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

• G09G3/3233 Primary

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

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2300/0842

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