Display device

Patent metadata

Field	Value
Publication number	US-12322333-B2
Application number	US-202318153662-A
Country	US
Kind code	B2
Filing date	Jan 12, 2023
Priority date	Mar 3, 2020
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

A display device includes pixels, and each pixel is connected between a first electrode or a second electrode of a driving transistor and a bias line, includes a bias transistor configured to transfer a bias voltage applied from the bias line to the first electrode or the second electrode of the driving transistor during a bias period. Bias voltages applied to the pixels emitting light of different colors are different from each other.

First claim

What is claimed is:

1. A display device including a plurality of pixels,
wherein each of the plurality of pixels, including:
a light-emitting diode;
a driving transistor including a gate electrode, a first electrode connected to a node, and a second electrode connected to the light-emitting diode;
a first transistor connected between a data line and the node;
a second transistor connected between the gate electrode of the driving transistor and the second electrode of the driving transistor and configured to connect the gate electrode of the driving transistor to the second electrode of the driving transistor; and
a third transistor connected between a pixel electrode of the light-emitting diode and a voltage line,
wherein the voltage line comprises a first voltage line and a second voltage line,
wherein the first voltage line is connected to the third transistor of a first pixel emitting light of a first color among the plurality of pixels, and the second voltage line is connected to the third transistor of a second pixel emitting light of a second color among the plurality of pixels,
wherein a voltage supplied through the first voltage line is different from a voltage supplied through the second voltage line, and
wherein the display device further comprising a common voltage line between two pixels of the plurality of pixels and connected to an opposite electrode of the light-emitting diode.

2. The display device of claim 1 ,
wherein the data line is extended in a first direction, and the first voltage line and the second voltage line are extended in a second direction perpendicular to the first direction.

3. The display device of claim 1 ,
wherein each of the plurality of pixels further includes:
a fourth transistor connected between the gate electrode of the driving transistor and a third voltage line.

4. The display device of claim 3 ,
wherein a frame comprises a data write period during which data signal is supplied through the data line, a first period before the data write period and a second period after the data write period, and
wherein the first transistor is turned on in the data write period, the fourth transistor is turned on in the first period and the third transistor is turned on in the second period.

5. The display device of claim 3 ,
wherein a frame comprises a data write period during which data signal is supplied through the data line, a first period before the data write period and a second period before the first period, and
wherein the first transistor is turned on in the data write period, the fourth transistor is turned on in the first period and the third transistor is turned on in the second period.

6. The display device of claim 3 ,
wherein a frame comprises a data write period during which data signal is supplied through the data line, a first period before the data write period, a second period after the data write period, and a third period between the data write period and the second period, and
wherein the first transistor is turned on in the data write period, the fourth transistor is turned on in the first period, the third transistor is turned on in the second period, and the second transistor is turned on in the third period.

7. The display device of claim 3 ,
wherein a frame comprises a data write period during which data signal is supplied through the data line, a first period before the data write period, a second period before the first period, and a third period after the second period, and
wherein the first transistor is turned on in the data write period, the fourth transistor is turned on in the first period, the third transistor is turned on in the second period, and the second transistor is turned on in the third period.

8. The display device of claim 3 ,
wherein each of the plurality of pixels further includes:
a sixth transistor connected between a fourth voltage line and one of a first electrode of the driving transistor and the second electrode of the driving transistor.

9. The display device of claim 8 ,
wherein a frame comprises a data write period during which data signal is supplied through the data line, a first period before the data write period, a second period after the data write period, and a third period between the data write period and the second period, and
wherein the first transistor is turned on in the data write period, the fourth transistor is turned on in the first period, the third transistor and the sixth transistor are turned on in the second period, and the second transistor is turned on in the third period.

10. The display device of claim 8 ,
wherein a frame comprises a data write period during which data signal is supplied through the data line, a first period before the data write period, a second period before the first period, and a third period after the second period, and
wherein the first transistor is turned on in the data write period, the fourth transistor is turned on in the first period, the third transistor and the sixth transistor are turned on in the second period, and the second transistor is turned on in the third period.

11. The display device of claim 8 ,
wherein the fourth voltage line comprises a fifth voltage line and a sixth voltage line,
wherein the fifth voltage line is connected to the sixth transistor of a first pixel emitting light of a first color among the plurality of pixels and the sixth voltage line is connected to the sixth transistor of a second pixel emitting light of a second color among the plurality of pixels, and
wherein a voltage supplied through the fifth voltage line is different from a voltage supplied through the sixth voltage line.

12. The display device of claim 11 ,
wherein the fifth voltage line is connected to the third transistor of a third pixel emitting light of a third color among the plurality of pixels.

13. The display device of claim 11 ,
wherein the fourth voltage line further comprises a seventh voltage line, and
wherein the seventh voltage line is connected to the sixth transistor of a third pixel emitting light of a third color among the plurality of pixels, and
wherein a voltage supplied through the fifth voltage line, a voltage supplied through the sixth voltage line, and a voltage supplied through the seventh voltage line are different from each other.

14. The display device of claim 8 ,
wherein the sixth transistor includes a first bias transistor and a second bias transistor, the first bias transistor being connected between the first electrode of the driving transistor and the fourth voltage line, and the second bias transistor being connected between the second electrode of the driving transistor and the fourth voltage line, and
wherein the first bias transistor and the second bias transistor are simultaneously turned on.

15. The display device of claim 8 ,
wherein each of the plurality of pixels further includes a capacitor connected between the gate electrode of the driving transistor and a driving voltage line.

16. The display device of claim 1 ,
wherein the first voltage line is connected to the third transistor of a third pixel emitting light of a third color among the plurality of pixels.

Assignees

• Samsung Display Co Ltd

Inventors

• Wang Seongmin
• Yang Yongho
• Kong Jihye
• Lee Jeongsoo

Classifications

• G09G3/2003

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G2310/0245

  Clearing or presetting the whole screen independently of waveforms, e.g. on power-on (G09G2310/063 takes precedence) · CPC title

• G09G2300/0819

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

• G09G2300/0469

  Details of the physics of pixel operation · CPC title