Display device

Patent metadata

Field	Value
Publication number	US-11450271-B2
Application number	US-202017078001-A
Country	US
Kind code	B2
Filing date	Oct 22, 2020
Priority date	Oct 24, 2019
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

A display device includes a display panel for driving a plurality of pixels. Each of the plurality of pixels includes: a light-emitting element; a driving transistor for controlling a driving current flowing through the light-emitting element; a first transistor for selectively applying a data voltage to a first node, a second transistor for receiving an emission signal from an emission control line to selectively apply a driving voltage to the first node; and a first capacitor connected between the first node and the emission control line. The first node is a source electrode of the driving transistor.

First claim

What is claimed is:

1. A display device comprising a display panel for driving a plurality of pixels, each of the plurality of pixels comprising:
a light-emitting element;
a driving transistor for controlling a driving current flowing through the light-emitting element;
a first transistor for selectively applying a data voltage to a first node, the first node being a source electrode of the driving transistor;
a second transistor for receiving an emission signal from an emission control line to selectively apply a driving voltage to the first node;
a third transistor for selectively connecting a second node with a third node, the second node being a drain electrode of the driving transistor, the third node being an anode electrode of the light-emitting element;
a fourth transistor for selectively applying a first initialization voltage from a first initialization voltage line to the third node;
a fifth transistor for selectively applying a second initialization voltage from a second initialization voltage line to a fourth node, the fourth node being a gate electrode of the driving transistor;
a sixth transistor for selectively connecting the second node with the fourth node; and
a first capacitor directly connected between the first node and the emission control line.

2. The display device of claim 1 , wherein the second transistor and the third transistor are turned on in response to the emission signal having a first voltage level, and
wherein the fourth transistor is turned on in response to the emission signal having a second voltage level that is higher than the first voltage level.

3. The display device of claim 1 , wherein the driving transistor comprises an active layer comprising a first material, and
wherein the fourth transistor comprises an active layer comprising a second material different from the first material.

4. The display device of claim 1 , wherein each of the driving transistor and the fourth transistor comprises an active layer comprising a first material, and
wherein each of the fifth and sixth transistors comprises an active layer comprising a second material different from the first material.

5. A display device comprising a display panel for driving a plurality of pixels, each of the plurality of pixels comprising:
a light-emitting element;
a driving transistor for controlling a driving current flowing through the light-emitting element;
a first transistor for selectively applying a data voltage to a first node, the first node being a source electrode of the driving transistor;
a second transistor for receiving an emission signal from an emission control line to selectively apply a driving voltage to the first node; and
a first capacitor connected between the first node and the emission control line,
wherein the display panel comprises:
a first active layer on a substrate and comprising a first material;
a first gate layer on the first active layer;
a second gate layer on the first gate layer;
a second active layer on the second gate layer and comprising a second material different from the first material;
a third gate layer on the second active layer; and
a first source-drain layer on the third gate layer.

6. The display device of claim 5 , wherein a first electrode of the first capacitor is in the first gate layer, and
wherein a second electrode of the first capacitor is in the second gate layer.

7. The display device of claim 6 , wherein the display panel further comprises a first connection electrode, and
wherein the first connection electrode is in the first source-drain layer, is connected to the second electrode of the first capacitor through a first contact opening, and is connected to the first node through a second contact opening, the first node also being a drain electrode of the second transistor.

8. The display device of claim 6 , wherein the emission control line comprises:
a first emission control line in the first gate layer; and
a second emission control line in the third gate layer, and
wherein the first electrode of the first capacitor is a part of the first emission control line that overlaps the second electrode.

9. The display device of claim 5 , wherein a first electrode of the first capacitor is in the third gate layer, and
wherein a second electrode of the first capacitor is in the first source-drain layer.

10. The display device of claim 9 , wherein the display panel further comprises a first connection electrode, and
wherein the first connection electrode is in the first source-drain layer and is connected to the first node through a first contact opening, the first node also being a drain electrode of the second transistor.

11. The display device of claim 9 , wherein the emission control line comprises:
a first emission control line in the first gate layer; and
a second emission control line in the third gate layer, and
wherein the first electrode of the first capacitor is a part of the second emission control line that overlaps the second electrode.

12. The display device of claim 5 , wherein a first electrode of the first capacitor is in the first gate layer, and
wherein a second electrode of the first capacitor is in the second active layer.

13. The display device of claim 12 , wherein the display panel further comprises a first connection electrode, and
wherein the first connection electrode is in the first source-drain layer, is connected to the second electrode of the first capacitor through a first contact opening, and is connected to the first node through a second contact opening, the first node also being a drain electrode of the second transistor.

14. The display device of claim 12 , wherein the emission control line comprises:
a first emission control line in the first gate layer; and
a second emission control line in the third gate layer, and
wherein the first electrode of the first capacitor is a part of the first emission control line that overlaps the second electrode.

15. A display device comprising a display panel for driving a plurality of pixels, each of the plurality of pixels comprising:
a light-emitting element;
a driving transistor for controlling a driving current flowing through the light-emitting element;
a first transistor for selectively applying a data voltage to a first node, the first node being a source electrode of the driving transistor;
a second transistor for receiving an emission signal from an emission control line to selectively apply a driving voltage to the first node;
a third transistor for receiving the emission signal to selectively connect a second node with a third node, the second node being a drain electrode of the driving transistor, the third node being an anode electrode of the light-emitting element; and
a first capacitor connected between the second node and the emission control line, the first capacitor being configured to store a difference in voltage between the emission control line and the second node.

16. The display device of claim 15 , wherein each of the plurality of pixels further comprises:
a fourth transistor for selectively applying a first initialization voltage to the third node;
a fifth transistor for selectively applying a second initialization voltage to a fourth node, the fourth node being a gate electrode of the driving transistor; and
a sixth transistor for selectively connecting the second node with the fourth node.

17. The display device of claim 16 , wherein the second transistor and the third transistor are turned on in response to the emission signal having a fi

Assignees

• Samsung Display Co Ltd

Inventors

• Na Ji Su

Classifications

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G2300/0842

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

• G09G2300/0439

  Pixel structures · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G3/3233 Primary

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