Display device

Patent metadata

Field	Value
Publication number	US-11257894-B2
Application number	US-202016808490-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Jul 8, 2019
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A display device includes: a substrate; a plurality of light-emitting diodes above the substrate; a plurality of pixel circuits above the substrate and electrically connected to the plurality of light-emitting diodes; a scan line extending in a first direction above the substrate, where the scan line delivers a scan signal to the plurality of pixel circuits; and a scan driver between the substrate and the plurality of pixel circuits and providing the scan signal to the scan line. A distance between the scan driver and the substrate is less than a distance between the plurality of pixel circuits and the substrate.

First claim

What is claimed is:

1. A display device comprising:
a substrate;
a plurality of light-emitting diodes above the substrate;
a plurality of pixel circuits above the substrate and electrically connected to the plurality of light-emitting diodes;
a scan line extending in a first direction above the substrate, wherein the scan line delivers a scan signal to the plurality of pixel circuits; and
a scan driver between the substrate and the plurality of pixel circuits, wherein the scan driver provides the scan signal to the scan line,
wherein a distance between the scan driver and the substrate is less than a distance between the plurality of pixel circuits and the substrate.

2. The display device of claim 1 , wherein
the plurality of light-emitting diodes, the plurality of pixel circuits, and the scan driver are in a display area of the display device.

3. The display device of claim 2 , further comprising:
an output line electrically connected to an output terminal of the scan driver and the scan line, and
the output line is in a same layer as the output terminal.

4. The display device of claim 3 , wherein
the output line extends in the first direction and crosses the display area, and
the output line and the scan line are in contact with each other in a plurality of positions.

5. The display device of claim 4 , wherein
the number of contact points between the output line and the scan line is equal to the number of the plurality of pixel circuits connected to the scan line.

6. The display device of claim 3 , further comprising:
a first planarization layer covering the scan driver and the output line; and
a second planarization layer between the pixel circuits and the plurality of light-emitting diodes,
wherein
the pixel circuits and the scan line are on the first planarization layer, and
the scan line is in contact with the output line via a contact hole defined in the first planarization layer.

7. The display device of claim 6 , wherein
the output line and the scan line extend to a peripheral area at an outer circumstance of the display area, and
a contact point between the output line and the scan line is in the peripheral area.

8. The display device of claim 7 , wherein
an opening surrounding the display area is defined in the second planarization layer, and
a metal material is in the opening.

9. The display device of claim 8 , wherein
the contact point between the output line and the scan line is in an area defined by the opening.

10. The display device of claim 6 , wherein
inorganic layers are respectively at an upper surface and a lower surface of the first planarization layer, and
the inorganic layers are in contact with each other at an outer periphery of the first planarization layer.

11. A display device comprising:
a substrate including a display area and a peripheral area at an outer circumference of the display area;
a scan driver on the substrate in the display area, wherein the scan driver generates a scan signal;
an output line on the substrate in the display area and electrically connected to the scan driver;
a first planarization layer covering the scan driver and the output line;
a thin-film transistor on the first planarization layer in the display area;
a scan line on the first planarization layer in the display area and connected to the output line to deliver the scan signal to the thin-film transistor;
a second planarization layer covering the thin-film transistor and the scan line; and
a light-emitting diode on the second planarization layer in the display area and electrically connected to the thin-film transistor.

12. The display device of claim 11 , wherein
the scan line and the output line are in contact with each other through a contact hole defined in the first planarization layer.

13. The display device of claim 12 , wherein
a contact point between the output line and the scan line is in the display area.

14. The display device of claim 13 , wherein
the output line and the scan line are in contact with each other in a plurality of positions.

15. The display device of claim 12 , wherein
the output line and the scan line extend to the peripheral area, and
the contact point between the output line and the scan line is in the peripheral area.

16. The display device of claim 15 , wherein
an opening surrounding the display area is defined in the second planarization layer, and
the opening is filled with a metal material.

17. The display device of claim 16 , wherein
the contact point is in an area defined by the opening.

18. The display device of claim 17 , wherein
the light-emitting diode comprises a pixel electrode electrically connected to the thin-film transistor, an opposite electrode above the pixel electrode, and an intermediate layer between the pixel electrode and the opposite electrode,
a common voltage line, which applies an electrical signal to the opposite electrode, is arranged in the peripheral area,
the opposite electrode and the common voltage line are connected to each other by a protective conductive layer, and
the protective conductive layer fills the opening.

19. The display device of claim 11 , wherein
inorganic layers are respectively at an upper surface and a lower surface of the first planarization layer, and
the inorganic layers are in contact with each other at an outer periphery of the first planarization layer.

20. The display device of claim 11 , wherein
the output line is integrally formed as a single unitary body with an output terminal of the scan driver, and
the output terminal is a drain electrode of a thin-film transistor of the scan driver.

Assignees

• Samsung Display Co Ltd

Inventors

• Yoon Juwon
• Yang Taehoon
• Kim Donghwan

Classifications

• H10D86/451

  characterised by the compositions or shapes of the interlayer dielectrics · CPC title

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• G09G2300/04

  Structural and physical details of display devices · CPC title

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title