DISPLAY DEVICE AND METHOD FOR FABRICATING THE SAME

• US 20150091101A1
• Filed: 09/29/2014
• Published: 04/02/2015
• Est. Priority Date: 09/30/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: HONG, Hyun Seok, AHN, Jung Eun, KANG, In
• Granted Patent: US 9,818,767 B2
• Time in Patent Office: Days
• US Class Current: 257/401
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1248 with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 27/1259 Multistep manufacturing methods

Abstract

Disclosed is a display device that may include a gate electrode and a first metal pattern on a substrate, the gate electrode being formed on a first region of the substrate and the first metal pattern being formed on a second region of the substrate; an insulating film formed on the gate electrode and the first metal pattern and provided with a first hole for exposing at least a part of the first metal pattern; source and drain electrodes formed on the insulating film in the first region and a second metal pattern formed on the insulating film in the second region; a pixel electrode formed on the source and drain electrodes, the pixel electrode electrically connected with the drain electrode, and a first protection electrode formed on the second metal pattern, the first protection electrode electrically connected with the second metal pattern and at least partially covering the second metal pattern; a passivation film formed on an entire surface of the substrate including the pixel electrode and the first protection electrode and provided with a second hole for exposing at least a part of the first metal pattern and a third hole for exposing at least a part of the first protection electrode; and a connection electrode formed on the passivation film, the connection electrode connected with the first metal pattern through a first contact hole formed by a combination of the first hole and the second hole, and connected with the first protection electrode through a second contact hole formed of the third hole, wherein the first protection electrode is formed of the same material as that of the pixel electrode.

Claims

1. A display device comprising:

a gate electrode and a first metal pattern on a substrate, the gate electrode being formed on a first region of the substrate and the first metal pattern being formed on a second region of the substrate;

an insulating film formed on the gate electrode and the first metal pattern and provided with a first hole for exposing at least a part of the first metal pattern;

source and drain electrodes formed on the insulating film in the first region and a second metal pattern formed on the insulating film in the second region;

a pixel electrode formed on the source and drain electrodes, the pixel electrode electrically connected with the drain electrode, and a first protection electrode formed on the second metal pattern, the first protection electrode electrically connected with the second metal pattern and at least partially covering the second metal pattern;

a passivation film formed on an entire surface of the substrate including the pixel electrode and the first protection electrode and provided with a second hole for exposing at least a part of the first metal pattern and a third hole for exposing at least a part of the first protection electrode; and

a connection electrode formed on the passivation film, the connection electrode connected with the first metal pattern through a first contact hole formed by a combination of the first hole and the second hole, and connected with the first protection electrode through a second contact hole formed of the third hole,

wherein the first protection electrode is formed of the same material as that of the pixel electrode.

2. The display device of claim 1, wherein the first protection electrode is extended to a region where the second metal pattern is not formed on the insulating film, and the third hole is formed in the passivation film to expose the extended region of the first protection electrode, which is not overlapped with the second metal pattern.

3. The display device of claim 1, further comprising:

a planarization film formed on the source and drain electrodes in the first region and formed on the second metal pattern in the second region to partially expose the second metal pattern,

wherein the pixel electrode is formed on the planarization film in the first region and is electrically connected with the drain electrode,

wherein the first protection electrode is formed on the planarization film and the second metal pattern which is not provided with the planarization film in the second region to at least partially cover the second metal pattern, and

wherein the first metal pattern is formed of the same material as that of the gate electrode and the second metal pattern is formed of the same material as that of the source and drain electrodes.

4. The display device of claim 3, wherein the planarization film is formed of acrylic resin including photo active compound (PAC).

5. The display device of claim 1, wherein the first metal pattern is configured as a gate pad and the second metal pattern is configured as a data pad.

6. The display device of claim 1, further comprising a second protection electrode formed between the first protection electrode and the passivation film, wherein the connection electrode is connected with the first protection electrode through the second protection electrode.

7. The display device of claim 6, further comprising a common electrode for receiving a touch signal of a user and a sensing line connected with the common electrode, wherein the second protection electrode is formed using the same material as that of the sensing line, and the connection electrode is formed of the same material as that of the common electrode.

8. The display device of claim 1, further comprising a common electrode for receiving a touch signal of a user and a sensing line connected with the common electrode, wherein the connection electrode is formed using the same material as that of the common electrode.

9. A method for fabricating a display device, the method comprising:

forming a gate insulating film, which has a hole for exposing at least a part of a first metal pattern, on a gate electrode formed on a first region of a substrate and the first metal pattern formed on a second region of the substrate;

forming source and drain electrodes on the gate insulating film of the first region, and forming a second metal pattern on the insulating film of the second region;

forming a first material layer for forming a pixel electrode, on an entire surface of the substrate including the source electrode, the drain electrode, and the second metal pattern;

forming the pixel electrode electrically connected with the drain electrode on the first region by patterning the first material layer and forming a first protection electrode, which is electrically connected with the second metal pattern and covers the second metal pattern, on the second metal pattern in the second region;

forming a passivation film on an entire surface of the substrate including the pixel electrode and the first protection electrode, the passivation film being provided with a second hole for exposing at least a part of the first metal pattern and a third hole for exposing at least a part of the first protection electrode; and

forming a common electrode on the passivation film in the first region and forming a connection electrode on the passivation film in the second region, the connection electrode being connected with the first metal pattern through a first contact hole formed by a combination of the first hole and the second hole and being connected with the first protection electrode through a second contact hole formed of the third hole.

10. The method of claim 9, wherein the first protection electrode is extended to a region where the second metal pattern is not formed on the insulating film, and the third hole is formed in the passivation film to expose the extended region of the first protection electrode, which is not overlapped with the second metal pattern.

11. The method of claim 9, between the step of forming the second metal pattern and the step of forming the first material layer, further comprising the step of forming a planarization film on an entire surface of the substrate including the source and drain electrodes in the first region and on the second metal pattern to partially expose the second metal pattern in the second region, wherein the first protection electrode is formed on the planarization film and the second metal pattern where the planarization film is not formed to cover the second metal pattern in the second region.

12. The method of claim 11, wherein the planarization film is formed of acrylic resin including photo active compound (PAC).

13. The method of claim 9, further comprising the steps of forming a second material layer on an entire surface of the substrate including the first protection electrode and the pixel electrode and forming a sensing line connected with the common electrode to receive a touch signal of a user on the pixel electrode in the first region and forming a second protection electrode on the first protection electrode in the second region by patterning the second material layer between the step of forming the pixel electrode and the step of forming the passivation film, wherein the connection electrode is connected with the first protection electrode through the second protection electrode.

14. The method of claim 9, wherein the connection electrode and the common electrode are formed using the same material as each other at the same time.