Display device

Patent metadata

Field	Value
Publication number	US-2026087980-A1
Application number	US-202519340442-A
Country	US
Kind code	A1
Filing date	Sep 25, 2025
Priority date	Sep 26, 2024
Publication date	Mar 26, 2026
Grant date	—

Abstract

A display device including an active layer, a gate insulating film disposed on the active layer and having a first opening; a first electrode electrically connected to at least a portion of the first area in the first opening; a second electrode disposed on the gate insulating film; a protective layer disposed on the first electrode and the second electrode and having a second opening; and a pixel electrode disposed on the protective layer and electrically connected to the first electrode in the second opening.

First claim

What is claimed is:

1 . A display device comprising:
a substrate; a transistor on the substrate, the transistor including an active layer, wherein the active layer includes a channel area, a first area located on one side of the channel area, and a second area located on the other side of the channel area; a gate insulating film disposed on the active layer and having a first opening; a first electrode electrically connected to at least a portion of the first area of the active layer in the first opening; a second electrode disposed on the gate insulating film and overlapping with the channel area; a protective layer disposed on the first electrode and the second electrode, the protective layer overlapping with at least a portion of the first electrode and having a second opening overlapping with at least a portion of the first opening; and a pixel electrode disposed on the protective layer and electrically connected to the first electrode in the second opening.

2 . The display device of claim 1 , further comprising:
a shielding pattern disposed on the substrate; and a buffer layer disposed on the substrate and the shielding pattern.

3 . The display device of claim 2 , wherein the shielding pattern is electrically connected to the pixel electrode at the second opening.

4 . The display device of claim 2 , wherein the pixel electrode, the first electrode, the active layer and the shielding pattern are electrically connected to each other.

5 . The display device of claim 1 , further comprising a storage capacitor disposed on the substrate and including a plurality of capacitor electrodes,
wherein the storage capacitor does not overlap with the second opening.

6 . The display device of claim 5 , wherein one of the plurality of capacitor electrodes is the second electrode.

7 . The display device of claim 5 , wherein the other one of the plurality of capacitor electrodes is the pixel electrode.

8 . The display device of claim 5 , wherein the second electrode extends to an area not overlapping with the channel area.

9 . The display device of claim 1 , wherein the active layer includes a peripheral area including a first connection portion where the pixel electrode and the first electrode are electrically connected, and a second connection portion where the first electrode and the first area are electrically connected, and
wherein a current path in the active layer is formed in the peripheral area.

10 . The display device of claim 1 , further comprising an auxiliary electrode disposed between the active layer and the first electrode,
wherein the auxiliary electrode includes a transparent conductive oxide.

11 . The display device of claim 10 , wherein a current path in the active layer is formed in an area passing through a second connection portion where the first electrode and the first area are electrically connected.

12 . The display device of claim 2 , wherein the first electrode is electrically connected to the shielding pattern at the second opening.

13 . The display device of claim 2 , wherein the first electrode and the first area are electrically connected at a second connection portion, and
wherein at least a portion of the second connection portion where the first electrode and the first area are electrically connected does not overlap with the shielding pattern.

14 . The display device of claim 1 , wherein the transistor is a driving transistor for driving a light emitting device,
wherein the first electrode is a source electrode or a drain electrode of the driving transistor, and the second electrode is a gate electrode of the driving transistor, and wherein the first electrode and the second electrode are formed of the same material.

15 . The display device of claim 1 , further comprising:
a high-potential voltage line to which a high-potential voltage is applied; and a third electrode electrically connected between the second area and the high-potential voltage line.

16 . The display device of claim 15 , wherein the first electrode, the second electrode and the third electrode include the same material.

17 . A display device comprising:
a substrate; a driving transistor disposed on the substrate, and including an active layer, a first electrode, a second electrode, and a third electrode; a light emitting device including a pixel electrode electrically connected to the first electrode, and a common electrode facing the pixel electrode; and a storage capacitor disposed on the driving transistor, and overlapping with a channel area of the active layer of the driving transistor.

18 . The display device of claim 17 , further comprising:
a gate insulating film disposed on the active layer and having a first opening; a protective layer disposed on the first electrode and the second electrode, overlapping with at least a portion of the first electrode, and having a second opening overlapping with at least a portion of the first opening; and a pixel electrode disposed on the protective layer and connected to the first electrode, which is electrically connected at least a portion of the active layer through the first opening, in the second opening.

19 . A display device comprising:
a substrate; a light shield disposed on the substrate; a transistor disposed on and overlapping the light shield in plan view, the transistor including an active layer including a channel area overlapping the light shield, a first area located on one side of the channel area, and a second area located on the other side of the channel area; a first electrode electrically connected to the first area, a second electrode overlapping the channel area, and a third electrode electrically connected to the second area; and a light emitting device including a common electrode connected to a first power voltage line applying a first power voltage, a pixel electrode, and a light emitting element disposed between the common electrode and the pixel electrode, wherein the pixel electrode includes an integrally-formed portion overlapping the second electrode to form a storage capacitor, directly contacts the first electrode, and overlaps the common electrode and light emitting element in plan view.

20 . The display device of claim 19 , further comprising:
an insulating film between the light shield and the channel area; a gate insulating film between the second electrode and the active layer including a first hole; and an insulating layer between the pixel electrode and the second electrode including a second hole overlapping the first hole in plan view, wherein the first hole and the second hole overlap at a location directly above the light shield.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Dongyoon
• Hwang Seonghwan
• GANG Byeonguk
• Kim Hyunjin
• Hwang Insu
• Pyo Jooyoung

Classifications

• G09G3/3225 Primary

  using an active matrix · CPC title