Invention Grant
- Patent Title: Bi-axial retardation compensation film and vertically aligned liquid crystal display using the same
- Patent Title (中): 双轴向延迟补偿膜和使用其的垂直取向液晶显示器
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Application No.: US12840172Application Date: 2010-07-20
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Publication No.: US08237898B2Publication Date: 2012-08-07
- Inventor: Byoung-kun Jeon , Sergey Belyaev , Jeong-su Yu
- Applicant: Byoung-kun Jeon , Sergey Belyaev , Jeong-su Yu
- Applicant Address: KR Seoul
- Assignee: LG Chem, Ltd.
- Current Assignee: LG Chem, Ltd.
- Current Assignee Address: KR Seoul
- Agency: McKenna Long & Aldridge LLP
- Priority: KR10-2003-0005468 20030128
- Main IPC: G02F1/1335
- IPC: G02F1/1335

Abstract:
The present invention relates to a vertically aligned LCD (VA-LCD) employing a bi-axial retardation compensation film, in which an in-plain refractive index (nx, ny) and a thickness refractive index (nz) of the film is nx>ny>nz. The film has a reversed wavelength dispersion in which retardation is increased in proportion to the increase of a wavelength in the range of visible rays and has a normal wavelength dispersion in which an absolute value of the thickness retardation is decreased in proportion to the increase of a wavelength in the range of visible rays. The VA-LCD cell having a retardation compensation characteristic is comprised by arranging a bi-axial retardation compensation film between the vertically aligned panel and a upper and lower polarizing plate. The VA-LCD of the present invention improves contrast characteristics on a front surface and at a tilt angle and minimizes coloring in a black state according to the tilt angle.
Public/Granted literature
- US20110032463A1 BI-AXIAL RETARDATION COMPENSATION FILM AND VERTICALLY ALIGNED LIQUID CRYSTAL DISPLAY USING THE SAME Public/Granted day:2011-02-10
Information query
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