Invention Grant
- Patent Title: Liquid crystal display devices having wide viewing angle and improved contrast ratio
- Patent Title (中): 液晶显示装置具有宽视角和改善的对比度
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Application No.: US10655516Application Date: 2003-09-04
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Publication No.: US06943858B2Publication Date: 2005-09-13
- Inventor: Jae-Jin Lyu , Hea-Ri Lee , Kyeong-Hyeon Kim , Jian-Min Chen
- Applicant: Jae-Jin Lyu , Hea-Ri Lee , Kyeong-Hyeon Kim , Jian-Min Chen
- Applicant Address: KR Suwon
- Assignee: Samsung Electronics Co., Ltd.
- Current Assignee: Samsung Electronics Co., Ltd.
- Current Assignee Address: KR Suwon
- Agency: McGuireWoods LLP
- Priority: KR97-21709 19970502; KR97-28480 19970627
- Main IPC: G02F1/13
- IPC: G02F1/13 ; G02F1/1335 ; G02F1/13363 ; G02F1/139 ; C09K19/02 ; G02F1/1337

Abstract:
Liquid crystal display devices include a vertically aligned liquid crystal cell having first and second surfaces that extend opposite each other and contain a liquid crystal material therein having negative dielectric anisotropy. First and second polarizers are attached to the first and second surfaces of the liquid crystal cell, respectively. A first a-plate compensation film and a first c-plate compensation film are provided. These films are disposed between the first surface of the liquid crystal cell and the first polarizer. The direction having a largest refractive index in the first a-plate compensation film is parallel to or perpendicular to a polarizing direction of the first polarizer. Moreover, a difference between a summation of a retardation (nx21−nza1)×da1 of the first a-plate compensation film, a retardation (nxc1−nzc1)×dc1 of the first c-plate compensation film and a retardation of the first and the second polarizers and a retardation due to birefringence of the liquid crystal cell is equal to or less than 15% of the retardation value due to birefringence of the liquid crystal cell.
Public/Granted literature
- US20040046916A1 Liquid crystal display devices having wide viewing angle and improved contrast ratio Public/Granted day:2004-03-11
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