Display device and method of repairing same

Patent metadata

Field	Value
Publication number	US-2025275387-A1
Application number	US-202519205248-A
Country	US
Kind code	A1
Filing date	May 12, 2025
Priority date	Dec 24, 2020
Publication date	Aug 28, 2025
Grant date	—

Abstract

A display device includes: a substrate on which circuit elements constituting a pixel are arranged; a repair pattern arranged overlying the substrate; a buffer layer covering the repair pattern; an active layer arranged overlying the buffer layer; a conductive layer which is arranged overlying the active layer and on which electrodes of the circuit elements are arranged; an overcoat layer covering the conductive layer, and a light emitting element arranged overlying the overcoat layer. The repair pattern is arranged in such a manner that one region thereof overlaps the active layer.

First claim

1 . A display device comprising:
a substrate on which circuit elements are arranged, the circuit elements being configured to drive a pixel; a repair pattern disposed on the substrate; a buffer layer on the repair pattern; an active layer disposed on the buffer layer; a conductive layer disposed over the active layer, the conductive layer including electrodes of the circuit elements; an overcoat layer covering the conductive layer; and a light emitting element disposed on the overcoat layer, wherein the repair pattern is arranged in such a manner that at least one region overlaps the active layer, and wherein the active layer is divided into cut-off regions at vicinity of the repair pattern.

2 . The display device of claim 1 , wherein the active layer comprises:
a first region overlapping the repair pattern; and a second region arranged adjacent to the first region.

3 . The display device of claim 2 , wherein the first region and the second region are separated from each other.

4 . The display device of claim 3 , wherein a step is formed between the first region and the second region.

5 . The display device of claim 1 , wherein the circuit elements each comprise:
a storage capacitor; a switching transistor storing a voltage corresponding to a data signal in the storage capacitor, the switching transistor configured to switch in response to a first gate signal; a drive transistor configured to control an amount of drive electric current to be applied to the light emitting element in a manner that corresponds to the voltage stored in the storage capacitor; and a sensing transistor configured to sense features of the circuit elements in response to a second gate signal, wherein the active layer overlapping the repair pattern is an active layer constituting the sensing transistor.

6 . The display device of claim 5 , further comprising:
a light blocking layer arranged on a layer that is the same as the repair pattern and the light blocking layer overlapping the drive transistor.

7 . The display device of claim 1 , further comprising:
a lower polarizer arranged underneath the substrate.

8 . The display device of claim 1 , wherein the active layer is formed of indium-gallium-zinc-oxide, and the repair pattern is formed of copper.

9 . The display device of claim 1 , wherein the active layer has a thickness of about 300 Å.

10 . The display device of claim 2 ,
wherein the buffer layer is further formed between the first region and the second region.

11 . The display device of claim 10 , wherein the repair pattern is propagated toward the active layer.

12 . The display device of claim 1 ,
wherein the buffer layer is divided into a first buffer region and a second buffer region corresponding to the cut-off regions of the active layer.

13 . The display device of claim 12 ,
wherein the buffer layer is divided by a step.

14 . The display device of claim 12 ,
wherein at least one of the cut-off regions is formed between the first buffer region and the second buffer region.

15 . The display device of claim 12 , wherein the repair pattern disposed between the first buffer region and the second buffer region.

16 . A display device comprising:
a substrate on which circuit elements are arranged, the circuit elements being configured to drive a pixel; a repair pattern disposed on the substrate; a buffer layer on the repair pattern; an active layer disposed on the buffer layer, the active layer including a first region overlapping the repair pattern and a second region adjacent to the first region, wherein a step is formed between the first region and the second region; a conductive layer disposed over the active layer, the conductive layer including electrodes of the circuit elements; an overcoat layer covering the conductive layer; and a light emitting element disposed over the overcoat layer, wherein the repair pattern includes at least one region that overlaps the active layer.

17 . The display device of claim 16 , wherein the circuit elements each comprise:
a storage capacitor; a switching transistor storing a voltage corresponding to a data signal in the storage capacitor, the switching transistor configured to switch in response to a first gate signal; a drive transistor configured to control an amount of drive electric current to be applied to the light emitting element in a manner that corresponds to the voltage stored in the storage capacitor; and a sensing transistor configured to sense features of the circuit elements in response to a second gate signal, wherein the active layer overlapping the repair pattern is an active layer constituting the sensing transistor.

18 . The display device of claim 17 , further comprising:
a light blocking layer arranged on a layer that is the same as the repair pattern and the light blocking layer overlapping the drive transistor.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Juhyuk
• JO Yongsun
• JUNG DeukSoo
• Lee Junggil

Classifications

• H10P74/232

  comprising connection or disconnection of parts of a device in response to a measurement · CPC title

• H10P74/20

  characterised by the properties tested or measured, e.g. structural or electrical properties · CPC title

• H10K59/131 Primary

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K71/861

  Repairing · CPC title