Pixel driving circuit, pixel circuit, display device, and driving method thereof

Patent metadata

Field	Value
Publication number	US-2021366387-A1
Application number	US-201816345146-A
Country	US
Kind code	A1
Filing date	Oct 26, 2018
Priority date	Dec 15, 2017
Publication date	Nov 25, 2021
Grant date	—

Abstract

Embodiments of the present disclosure provide a pixel driving circuit. The pixel driving circuit includes a reset circuit, a compensation and data-in circuit, a drive transistor, and a light-emitting control circuit. The reset circuit is configured to reset a voltage of a control electrode of the drive transistor according to a first and third control signals. The compensation and data-in circuit is configured to receive a reference signal from the data line according to the first control signal, receive a data signal from the data line according to a second control signal, and apply a compensation voltage to the control electrode of the drive transistor based on the reference signal, the data signal, and a voltage of the first voltage terminal. The light-emitting control circuit is configured to control the light-emitting device to emit light according to a third control signal.

First claim

1 . A pixel driving circuit comprising a reset circuit, a compensation and data-in circuit, a drive transistor, and a light-emitting control circuit,
wherein the reset circuit is coupled to a first control terminal, a control electrode of the drive transistor, and a second electrode of the drive transistor, and is configured to reset a voltage of the control electrode of the drive transistor, according to a first control signal from the first control terminal and a third control signal from a third control terminal; wherein the compensation and data-in circuit is coupled to a data line, the first control terminal, a second control terminal, the control electrode of the drive transistor, and a first voltage terminal, and is configured to receive a reference signal from the data line according to the first control signal, receive a data signal from the data line according to a second control signal from the second control terminal, and apply a compensation voltage to the control electrode of the drive transistor based on the reference signal, the data signal, and a voltage of the first voltage terminal; wherein the control electrode of the drive transistor is coupled to the compensation and data-in circuit, wherein a first electrode of the drive transistor is coupled to the first voltage terminal, and wherein the second electrode of the drive transistor is coupled to the light-emitting control circuit; and wherein the light-emitting control circuit is coupled to a light-emitting device and the third control terminal, and is configured to control the light-emitting device to emit light according to the third control signal.

2 . The pixel driving circuit according to claim 1 , wherein the reset circuit comprises a first transistor,
wherein a control electrode of the first transistor is coupled to the first control terminal, wherein a first electrode of the first transistor is coupled to the second electrode of the drive transistor, and wherein a second electrode of the first transistor is coupled the control electrode of the drive transistor.

3 . The pixel driving circuit according to claim 1 or 2 , wherein the compensation and data-in circuit comprises a second transistor, a third transistor, a first capacitor, and a second capacitor,
wherein a control electrode of the second transistor is coupled to the first control terminal, wherein a first electrode of the second transistor is coupled to the data line, and wherein a second electrode of the second transistor is coupled to a first terminal of the first capacitor and a first terminal of the second capacitor;
wherein a control electrode of the third transistor is coupled to the second control terminal, wherein a first electrode of the third transistor is coupled to the data line, and wherein a second electrode of the third transistor is coupled to the first terminal of the second capacitor;
wherein a second terminal of the first capacitor is coupled to the control electrode of the drive transistor; and
wherein a second terminal of the second capacitor is coupled to the first voltage terminal.

4 . The pixel driving circuit according to claim 1 , wherein the light-emitting control circuit comprises a fourth transistor,
wherein a control electrode of the fourth transistor is coupled to the third control terminal, wherein a first electrode of the fourth transistor is coupled to the light-emitting device, and wherein a second electrode of the fourth transistor is coupled to the second electrode of the drive transistor.

5 . The pixel driving circuit according to claim 1 , wherein the reference signal is provided by the data line in a blanking interval.

6 . A pixel driving circuit comprising a drive transistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, and a second capacitor,
wherein a control electrode of the drive transistor is coupled to a second electrode of the first transistor and a second terminal of the first capacitor, wherein a first electrode of the drive transistor is coupled to a first voltage terminal and a second terminal of the second capacitor, and wherein a second electrode of the drive transistor is coupled to a first electrode of the first transistor and a second electrode of the fourth transistor; wherein a control electrode of the first transistor is coupled to a first control terminal; wherein a control electrode of the second transistor is coupled to the first control terminal, wherein a first electrode of the second transistor is coupled to a data line, and wherein a second electrode of the second transistor is coupled to a first terminal of the first capacitor and a first terminal of the second capacitor; wherein a control electrode of the third transistor is coupled to a second control terminal, wherein a first electrode of the third transistor is coupled to the data line, and wherein a second electrode of the third transistor is coupled to the first terminal of the second capacitor; and wherein a control electrode of the fourth transistor is coupled to a third control terminal, and wherein a first electrode of the fourth transistor is coupled to a light-emitting device.

7 . The pixel driving circuit according to claim 6 , wherein the data line is configured to receive a reference signal and a data signal in different intervals.

8 . The pixel driving circuit according to claim 6 or 7 , wherein a current flowing through the drive transistor when the light-emitting device is emitting light is expressed as:

I
=

K
⁡

[

C
⁢
1
×
C
⁢
2

C
⁢
1
×
C
⁢
2

+

C
⁢
2
×
C
⁢
3

+

C
⁢
3
×
C
⁢
1

⁢

(

Vdata
-
Vref

)

]

2

where I represents the current flowing through the drive transistor, K represents a current constant associated with the drive transistor, C 1 represents a capacitance value of the first capacitor, C 2 represents a capacitance value of the second capacitor, C 3 represents a capacitance value of a parasitic capacitor of the drive tra

Assignees

• Boe Technology Group Co Ltd

Inventors

• Yin Xinshe

Classifications

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · 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

• G09G3/3291

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2300/0819

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

• G09G2300/0852

  being a dynamic memory with more than one capacitor · CPC title