Invention Grant
- Patent Title: Liquid crystal display device 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.: US10114718Application Date: 2002-04-01
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Publication No.: US06646701B2Publication Date: 2003-11-11
- 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
- Priority: KR97-21709 19970529; KR97-28480 19970627
- Main IPC: G02F11335
- IPC: G02F11335

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 (nxa1−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
- US20020149733A1 Liquid crystal display device having wide viewing angle and improved contrast ratio Public/Granted day:2002-10-17
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