Fringe field switching type liquid crystal display having metal layer for protecting pad

Patent metadata

Field	Value
Publication number	US-9939693-B2
Application number	US-201615362411-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	Dec 28, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

The present disclosure relates to a fringe field switching type liquid crystal display. The present disclosure suggests a fringe field switching type liquid crystal display comprising: a substrate; a gate pad disposed on the substrate; a gate insulating layer covering the gate pad; a data pad disposed on the gate insulating layer; a first passivation layer covering the data pad; a common pad disposed on the first passivation layer; a protective metal layer disposed on the common pad; a second passivation layer covering the common pad; a gate contact hole exposing the gate pad; a data contact hole exposing the data pad; and a common contact hole exposing the protective metal layer.

First claim

What is claimed is:

1. A liquid crystal display having a substrate, comprising:
a gate pad disposed on the substrate;
a gate insulating layer covering the gate pad including the substrate;
a data pad disposed on the gate insulating layer;
a first passivation layer covering the data pad;
a common pad disposed on the first passivation layer;
a protective metal layer protecting the common pad from an etchant and disposed on the common pad;
a second passivation layer on the common pad;
a gate contact hole exposing the gate pad;
a data contact hole exposing the data pad; and
a common contact hole exposing the protective metal layer.

2. The liquid crystal display according to claim 1 ,
wherein the protective metal layer comprises a plurality of unit protective metal layers disposed on the common pad in a matrix form, and
wherein the common contact hole comprises a plurality of unit common contact holes exposing each of the unit protective metal layers.

3. The liquid crystal display according to claim 2 , wherein the unit protecting metal layers has an area larger area than the unit common pad contact hole.

4. The liquid crystal display according to claim 2 , wherein the unit protective metal layer has a size of (a+10) μm×(b+10) μm where the unit common pad contact hole has a size of a μm×b μm.

5. The liquid crystal display according to claim 1 ,
wherein the gate pad is disposed at one end of a gate line,
wherein the data pad is disposed at one end of a data line, and
wherein the common pad is disposed at one end of a common line.

6. The liquid crystal display according to claim 1 ,
wherein the common pad is formed of a transparent conductive material.

7. The liquid crystal display according to claim 6 , wherein the protective metal layer is formed of a conductive material having a resistance lower than that of the transparent conductive material.

8. The liquid crystal display according to claim 6 , wherein the conductive material is selected from the group consisting of copper, titanium, nickel, molybdenum and any alloys thereof.

9. The liquid crystal display according to claim 1 , further comprising:
a gate pad terminal contacting the gate pad through a gate pad contact hole;
a data pad terminal contacting the data pad through a data pad contact hole; and
a common pad terminal contacting the common pad through a common pad contact hole.

10. The liquid crystal display according to claim 1 , further comprising:
a common electrode connecting to the common pad on the first passivation layer; and
a pixel electrode overlapping the common electrode on the second passivation layer.

11. A liquid crystal display having a substrate, comprising:
a planarization layer over the substrate;
a common pad on the planarization layer;
a protective metal layers protecting the common pad from an etchant and disposed on the common pad; and
a common pad terminal contacting the common pad through a plurality of common pad contact holes,
wherein the protective metal layer has an area larger than the common pad contact hole.

12. The liquid crystal display according to claim 11 , wherein the protective metal layer has a size of (a+10) μm×(b+10) μm where each of the plurality of common pad contact holes has a size of a μm×b μm.

13. The liquid crystal display according to claim 11 , wherein the common pad is disposed at one end of a common line.

14. The liquid crystal display according to claim 11 , wherein the common pad is formed of a transparent conductive material.

15. The liquid crystal display according to claim 14 , wherein the protective metal layer is formed of a conductive material having a resistance lower than that of the transparent conductive material.

16. The liquid crystal display according to claim 14 , wherein the conductive material is selected from the group consisting of copper, titanium, nickel, molybdenum and any alloys thereof.

17. The liquid crystal display according to claim 14 , wherein the transparent conductive material is selected from the group consisting of indium tin oxide and indium zinc oxide.

18. The liquid crystal display according to claim 11 , further comprising a common electrode connected to the common pad on the planarization layer.

19. The liquid crystal display according to claim 11 , wherein the protective metal layer comprises a plurality of unit protective metal layers disposed on the common pad in a matrix form, and the common contact hole comprises a plurality of unit common contact holes exposing each of the unit protective metal layers.

20. The liquid crystal display according to claim 13 , wherein the common pad is formed of a same material as the common line.

Assignees

• Lg Display Co Ltd

Inventors

• Kwon Dhang
• Son Jungho

Classifications

• H01L27/1225

  Electricity · mapped topic

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F2001/134372

  Physics · mapped topic

• H01L29/78606

  Electricity · mapped topic

• G02F1/134363 Primary

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title