Liquid crystal display and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016291372-A1
Application number	US-201514809547-A
Country	US
Kind code	A1
Filing date	Jul 27, 2015
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A liquid crystal, display includes: a substrate; a thin film transistor positioned on the substrate; a pixel electrode positioned on the thin film transistor; a roof layer facing the pixel electrode; a liquid crystal layer positioned between the pixel electrode and the roof layer including a plurality of micro cavities filled with a liquid crystal material, a capping layer positioned on the roof layer and having a thickness direction phase difference Rth of 120 nm or more to 140 nm or less; and an upper polarizer positioned on the capping layer and a lower polarizer positioned below the substrate.

First claim

What is claimed is:

1 . A liquid crystal display comprising:
a substrate; a thin film transistor positioned on the substrate; a pixel electrode positioned on the thin film transistor; a roof layer facing the pixel electrode; a liquid crystal layer positioned between the pixel electrode and the roof layer and including a plurality of micro cavities filled with a liquid crystal material, a capping layer positioned on the root layer and having a thickness direction phase difference Rth of 120 nm or more to 140 nm or less; and an upper polarizer positioned on the capping layer and a lower polarizer positioned below the substrate.

2 . The liquid crystal display of claim 1 , wherein:
the capping layer includes a material having a thickness direction phase difference Rth changed depending on an ultraviolet (UV) curing condition.

3 . The liquid crystal display of claim 2 , wherein:
the capping layer includes at least one of an organic insulating material including parylen, silicone, and an ultraviolet (UV) curable sheet.

4 . The liquid crystal display of claim 1 , wherein:
the upper polarizer includes a polyvinyl alcohol (PVA) layer.

5 . The liquid crystal display of claim 4 , wherein:
the upper polarizer excludes an Rth compensation film.

6 . The liquid crystal display of claim 5 , wherein:
a thickness direction phase difference Rth of the Rth compensation film is 120 nm or more to 140 nm or less.

7 . The liquid crystal display of claim 1 , wherein:
the lower polarizer includes a polyvinyl alcohol (PVA) layer and an Rth compensation film positioned below the substrate.

8 . The liquid crystal display of claim 7 , wherein:
a thickness direction phase difference Rth of the Rth compensation film is 120 nm or more to 140 nm or less.

9 . The liquid crystal display of claim 1 , further comprising:
a common electrode and a lower insulating layer positioned between each of the plurality of micro cavities and the roof layer, wherein the lower insulating layer is positioned on the common electrode.

10 . The liquid crystal display of claim 9 , wherein:
the plurality of micro cavities include a plurality of regions corresponding to pixel areas, trenches are positioned between plurality of regions, and the capping layer covers the trenches.

11 . The liquid crystal display of claim 10 , wherein:
the trenches are extended in a direction that is in parallel with gate lines connected to the thin film transistor.

12 . The liquid crystal display of claim 21 , wherein:
the thin film transistor is connected to data lines, and partition wall parts are formed, between the plurality at micro cavities in a direction in which the data lines are extended.

13 . A method of manufacturing a liquid crystal display, comprising:
forming a thin film transistor on a substrate; forming a pixel electrode that is connected to one terminal of the thin film transistor: forming a sacrificial layer on the pixel electrode; forming a roof layer on the sacrificial layer; forming a plurality of micro cavities; forming inlets by removing the sacrificial layer; injecting a liquid crystal material into the plurality of micro cavities; forming a capping layer on the roof layer, the capping layer covering the inlets and having a thickness direction phase difference Rth of 120 nm or more to 140 nm or less by UV curing; and forming an upper polarizer on the capping layer and forming a lower polarizer below the substrate.

14 . The method of manufacturing a liquid crystal display of claim 13 , wherein:
the capping layer includes a material having a thickness direction phase difference Rth changed depending on an ultraviolet (UV) curing condition.

15 . The method of manufacturing a liquid crystal display of claim 14 , wherein:
the capping layer Includes at least one of an organic insulating material including parylen, silicone, and an ultraviolet (UV) curable sheet.

16 . The method of manufacturing a liquid crystal display of claim 13 , wherein:
the upper polarizer excludes an Rth compensation film.

17 . The method of manufacturing a liquid crystal display of claim 13 , wherein:
the lower polarizer is positioned below the substrate.

18 . The method of manufacturing a liquid crystal display of claim 17 , wherein:
the lower polarizer includes a polyvinyl alcohol (PVA) layer and an Rth compensation film positioned below the substrate.

Assignees

• Samsung Display Co Ltd

Inventors

• Byun Ho Yun
• Kim Dong Woo

Classifications

• G02F1/133345

  Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence) · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · 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

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G02F1/133528

  Polarisers · CPC title