Liquid crystal display and method of fabricating the same

Patent metadata

Field	Value
Publication number	US-9618812-B2
Application number	US-201414173636-A
Country	US
Kind code	B2
Filing date	Feb 5, 2014
Priority date	Sep 30, 2013
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

Provided are a liquid crystal display and a method of fabricating the liquid crystal display. The liquid crystal display comprises: a substrate; a signal electrode on the substrate; a first light-blocking pattern on the signal electrode and having a trench extending to and exposing at least part of the signal electrode; and a second light-blocking pattern on the trench of the first light-blocking pattern and covering the signal electrode, wherein the second light-blocking pattern comprises at least one metal layer.

First claim

What is claimed is:

1. A liquid crystal display (LCD) comprising:
a substrate;
a signal electrode on the substrate;
a first light-blocking pattern on the signal electrode, the first light-blocking pattern having a trench extending to at least part of the signal electrode; and
a second light-blocking pattern on the trench of the first light-blocking pattern and covering the signal electrode,
wherein the second light-blocking pattern comprises at least one metal layer;
color filters on the same layer as the first light-blocking pattern on the substrate;
a first electrode on each of the color filters;
a second electrode on the first electrode and insulated from the first electrode and defining a cavity between the second electrode and the first electrode;
a first capping layer which is formed between the color filters and the first electrode to cover the color filters, the first light-blocking pattern and the signal electrode; and
a first passivation layer between the first capping layer and the first electrode along the first capping layer.

2. The LCD of claim 1 , further comprising a thin-film transistor on the substrate and comprising a gate electrode, a source electrode and a drain electrode, wherein the signal electrode is any one of the source electrode and the drain electrode.

3. The LCD of claim 1 , wherein the metal layer is formed of any one of Cr, CrOx, IZO, Ti, Al and Ni.

4. The LCD of claim 1 , wherein the second light-blocking pattern comprises a low-reflective metal layer, wherein the low-reflective metal layer comprises a Ti-containing first metal layer and an IZO-containing second metal layer formed on the first metal layer.

5. The LCD of claim 1 , wherein the first light-blocking pattern is formed of light-blocking organic matter.

6. The LCD of claim 1 , wherein a height of the second light-blocking pattern from a flat surface of the first passivation layer is equal to or less than one tenth of a height of the cavity from the flat surface of the first passivation layer.

7. The LCD of claim 1 , further comprising:
a cover layer on the second electrode;
a liquid crystal layer comprising liquid crystal molecules in the cavity;
an entrance of the cavity; and
a sealing layer sealing the entrance of the cavity.

8. The LCD of claim 1 , wherein the second light-blocking pattern is conformally along inner walls of the trench.

9. The LCD of claim 1 , wherein the second light-blocking pattern fills at least part of the trench.

10. A method of fabricating a LCD comprising:
forming a signal electrode on a substrate;
forming a first light-blocking pattern, which has a trench extending to at least part of the signal electrode, on the signal electrode;
forming a second light-blocking pattern, which covers the signal electrode and comprises at least one metal layer, on the trench of the first light-blocking pattern;
forming color filters on the same layer as the first light-blocking pattern on the substrate;
forming a first electrode on each of the color filters;
forming a second electrode on the first electrode to be insulated from the first electrode and define a cavity between the second electrode and the first electrode;
forming a first capping layer between the color filters and the first electrode to cover the color filters, the first light-blocking pattern and the signal electrode; and
forming a first passivation layer between the first capping layer and the first electrode along the first capping layer.

11. The method of claim 10 , wherein the forming of the second light-blocking pattern comprises forming the metal layer using any one of Cr, CrOx, IZO, Ti, Al and Ni.

12. The method of claim 10 , wherein the forming of the second light-blocking pattern comprises forming the second light-blocking pattern to comprise a low-reflective metal layer.

13. The method of claim 12 , wherein the forming of the second light-blocking pattern to comprise the low-reflective metal layer comprises forming a Ti-containing first metal layer on the trench of the first light-blocking pattern and forming an IZO-containing second metal layer on the first metal layer.

14. The method of claim 10 , wherein the forming of the second light-blocking pattern is performed using a photolithography process or a printing process.

15. The method of claim 10 , wherein the forming of the second light-blocking pattern comprises forming the second light-blocking pattern such that a height of the second light-blocking pattern from a flat surface of the first passivation layer is equal to or less than one tenth of a height of the cavity from the flat surface of the first passivation layer.

16. The method of claim 10 , further comprising:
forming a cover layer on the second electrode;
forming an entrance of the cavity; and
forming a liquid crystal layer by injecting liquid crystal molecules into the cavity through the entrance of the cavity.

17. The method of claim 16 , wherein the cavity is formed between the first electrode and the second electrode by forming a sacrificial layer on the first electrode, forming the second electrode and a second passivation layer on the sacrificial layer, forming the cover layer on the second passivation layer, and removing the sacrificial layer.

18. The method of claim 16 , further comprising forming a sealing layer which seals the entrance of the cavity.

Assignees

• Samsung Display Co Ltd

Inventors

• Cha Tae Woon
• Choi Sang Gun
• Park Ha Young

Classifications

• G02F1/1341

  Filling or closing of cells · CPC title

• G02F2001/136218

  Physics · mapped topic

• G02F1/136209 Primary

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F1/133377

  Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel · CPC title