Display device including a repair pattern to repair a defective pixel and method of repairing same

Patent metadata

Field	Value
Publication number	US-11765948-B2
Application number	US-202017128869-A
Country	US
Kind code	B2
Filing date	Dec 21, 2020
Priority date	Dec 31, 2019
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

Provided are a display device and a method of repairing the display device, wherein a defective pixel is repaired using a bankless structure that includes a repair pattern.

First claim

What is claimed is:

1. A display device comprising:
a substrate on which a first pixel that is defective and a second pixel is placed, the substrate including an emission area and a non-emission area;
a first conductive layer placed on the substrate, the first conductive layer including a light-shielding layer and a lower electrode of a storage capacitor;
one or more insulation layers covering the light-shielding layer;
a second conductive layer formed on the one or more insulation layers, the second conductive layer including an upper electrode of the storage capacitor;
an overcoat layer placed above the second conductive layer;
an anode electrode of the defective first pixel that is placed on the overcoat layer, the anode electrode connected to the upper electrode of the storage capacitor;
an emission layer of the defective first pixel, the emission layer covering the anode electrode of the defective pixel; and
a cathode electrode of the defective first pixel, the cathode electrode placed on the emission layer of the defective first pixel,
wherein the second conductive layer includes:
a driving transistor of the defective first pixel, the driving transistor including a drain electrode that is connected to the light-shielding layer and the upper electrode of the storage capacitor; and
a repair pattern connected to an anode electrode of the second pixel, at least a region of the repair pattern overlapping the light-shielding layer, but is non-overlapping with the anode electrode of the second pixel, and
wherein the repair pattern does not overlap the anode electrode of the defective first pixel.

2. The display device of claim 1 , wherein in the at least the region of the repair pattern, an electrical connection is formed between the light-shielding layer and the repair pattern.

3. The display device of claim 2 , wherein as the electrical connection is formed, a part of a driving current applied to the anode electrode of the second pixel is applied to the anode electrode of the defective first pixel, passing through the repair pattern, the light-shielding layer, the drain electrode, and the upper electrode.

4. The display device of claim 1 , wherein the repair pattern is an island-shaped electrode placed between the anode electrode of the defective first pixel and the anode electrode of the second pixel.

5. The display device of claim 1 , wherein the light-shielding layer is in a shape of an extending bar of which a first end is electrically connected to a bridge pattern and a second end is placed near the anode electrode of the second pixel.

6. The display device of claim 1 , wherein the repair pattern is electrically connected to a protruding pattern of the anode electrode of the second pixel.

7. A display device comprising:
a substrate on which a first pixel that is defective and a second pixel is placed, the substrate including an emission area and a non-emission area;
a first conductive layer placed on the substrate, the first conductive layer including a light-shielding layer;
a buffer layer covering the first conductive layer;
a driving transistor of the defective first pixel, the driving transistor including an active layer in which a channel, a source electrode, and a drain electrode of a driving transistor are formed, the active layer being placed on the buffer layer;
a second conductive layer placed on the active layer, the second conductive layer including a gate electrode of the driving transistor of the defective first pixel;
a gate insulation layer interposed between the active layer and the second conductive layer;
an overcoat layer placed above the second conductive layer;
an anode electrode of the defective first pixel, the anode electrode of the defective first pixel placed on the overcoat layer;
an emission layer of the defective first pixel, the emission layer covering the anode electrode of the defective first pixel;
a cathode electrode of the defective first pixel, the cathode electrode placed on the emission layer of the defective first pixel,
wherein the second conductive layer includes:
a bridge pattern electrically connecting the drain electrode of the defective first pixel and the anode electrode of the defective first pixel; and
a repair pattern that is electrically connected to an anode electrode of the second pixel, at least a region of the repair pattern overlaps the light-shielding layer, but is non-overlapping with the anode electrode of the second pixel, and
wherein the repair pattern does not overlap the anode electrode of the defective first pixel.

8. The display device of claim 7 , wherein at least a region of the bridge pattern does not overlap the first conductive layer.

9. The display device of claim 7 , wherein the bridge pattern is cut, so that the anode electrode of the defective first pixel is electrically separated from the drain electrode of the driving transistor.

10. The display device of claim 7 , wherein the repair pattern is electrically connected to the light-shielding layer.

11. The display device of claim 10 , wherein as the electrical connection is formed, a part of a driving current applied to the anode electrode of the second pixel is applied to the anode electrode of the defective first pixel, passing through the repair pattern, the light-shielding layer, and the bridge pattern.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Juhyuk
• JUNG DeukSoo
• JO Yongsun

Classifications

• H10P74/203

  Structural properties, e.g. testing or measuring thicknesses, line widths, warpage, bond strengths or physical defects · CPC title

• H10P74/232

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

• H10K59/131 Primary

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

• H10K59/126 Primary

  Shielding, e.g. light-blocking means over the TFTs · CPC title

• H10K59/351

  comprising more than three subpixels, e.g. red-green-blue-white [RGBW] · CPC title