IP Library Granted Patent US 9,513,509
Granted Patent B2
US 9,513,509 · App. 14/160,055 · Granted Dec 6, 2016

Liquid crystal display

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Quick Facts
Patent No.
US 9,513,509
App. No.
14/160,055
Granted
Dec 6, 2016
Kind
B2
Abstract

A liquid crystal display includes a first substrate and a second substrate facing each other. A color filter is positioned on the first substrate. A liquid crystal layer is interposed between the first substrate and the second substrate. A first polarizer is positioned on an outer surface of the first substrate. A first compensation film is positioned on an outer surface of the first polarizer. A second compensation film is positioned on an outer surface of the second substrate. A third compensation film is positioned on an outer surface of the second compensation film. A second polarizer is positioned on an outer surface of the third compensation film. The second compensation film includes a negative C-plate, and the third compensation film includes a biaxial film.

Claims (27)

1. A liquid crystal display, comprising:

a first substrate and a second substrate facing each other;

a thin film transistor positioned on the first substrate;

a color filter positioned on the first substrate;

a common electrode positioned on the second substrate;

a liquid crystal layer interposed between the first substrate and the second substrate;

a first polarizer positioned on an outer surface of the first substrate;

a first compensation film positioned on an outer surface of the first polarizer;

a second polarizer positioned on an outer surface of the second substrate, and

a second compensation film and a third compensation film positioned between the second substrate and the second polarizer,

wherein the third compensation film, comprising a negative C-plate, is positioned between the second compensation film, comprising a biaxial film, and the second polarizer.

2. The liquid crystal display of claim 1 , wherein a thickness direction phase retardation value of the biaxial film ranges from about 150 nm to about 230 nm.

3. The liquid crystal display of claim 1 , wherein an in-plane phase retardation value of the biaxial film ranges from about 45 nm to about 75 nm.

4. The liquid crystal display of claim 3 , wherein a thickness direction phase retardation value of the biaxial film is about 180 nm, and the in-plane phase retardation value of the biaxial film is about 65 nm.

5. The liquid crystal display of claim 1 , wherein a thickness direction phase retardation value of the negative C-plate ranges from about 40 nm to about 120 nm.

6. The liquid crystal display of claim 5 , wherein the thickness direction phase retardation value of the negative C-plate is about 90 nm.

7. The liquid crystal display of claim 1 , wherein the first compensation film includes a phase retardation layer.

8. The liquid crystal display of claim 7 , wherein an in-plane phase retardation value of the phase retardation layer is about 0, and a thickness direction phase retardation value of the phase retardation layer is about 0.

9. The liquid crystal display of claim 1 , wherein the first compensation film, the second compensation film, and the third compensation film include triacetyl cellulose (TAC), a cycloolefin polymer (COP)-based resin, and/or an acryl-based polymer resin.

10. The liquid crystal display of claim 9 , wherein the acryl-based polymer resin includes polymethyl methacrylate (PMMA).

11. The liquid crystal display of claim 1 , further comprising:

a pixel electrode connected to the thin film transistor.

12. The liquid crystal display of claim 11 , further comprising a light blocking member positioned on the first substrate.

13. The liquid crystal display of claim 12 , further comprising a spacer positioned between the first substrate and the second substrate.

14. The liquid crystal display of claim 13 , wherein the spacer and the light blocking member are formed of substantially the same material.

15. The liquid crystal display of claim 14 , wherein the spacer and the light blocking member are substantially simultaneously formed.

16. The liquid crystal of claim 1 , wherein the second compensation film is configured to meet nx=ny>nz, and the third compensation film is configured to meet nx≠ny≠nz, wherein nx, ny, and nz, respectively, are refractive indexes in x-axis, y-axis, and z-axis directions.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 21, 2022
From: SAMSUNG DISPLAY CO., LTD.
To: TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
Reel/Frame 060778/0543 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 21, 2014
From: KIM, JI-HOON; KIM, KWANG-HYUN; KIM, DAE WON; PARK, SEUNG BEOM; BEON, BEONG-HUN; LEE, SEUNG HEE; JANG, YUN; SHIN, NA YOUNG; LEE, SANG-GU
To: SAMSUNG DISPLAY CO., LTD
Reel/Frame 032011/0342 →