Invention Grant
- Patent Title: LCD apparatus
- Patent Title (中): 液晶显示装置
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Application No.: US12102364Application Date: 2008-04-14
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Publication No.: US08149341B2Publication Date: 2012-04-03
- Inventor: Yoshihiro Furuta
- Applicant: Yoshihiro Furuta
- Applicant Address: JP Moriguchi-shi
- Assignee: Sanyo Electric Co., Ltd.
- Current Assignee: Sanyo Electric Co., Ltd.
- Current Assignee Address: JP Moriguchi-shi
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Agent William F. Westerman
- Priority: JP2007-106993 20070416
- Main IPC: G02F1/1335
- IPC: G02F1/1335

Abstract:
An LCD panel (214) is provided on the light-incidence side thereof with a reflective polarizer. An optical compensator (213) is provided between a reflective polarizer (211) and the LCD panel (214) to reduce birefringence that takes place in the liquid crystal of the LCD panel (214). A further absorptive polarizer (212) is provided between a reflective polarizer (211) and the optical compensator (213). The reflective polarizer (211) and the absorptive polarizer (212) are arranged so that their transmission axes coincide to each other. Thus, the absorptive polarizer and optical compensator together cooperate to compensate for the deficient polarization degree of the reflective polarizer to improve the contrast of a displayed image. The absorptive polarizer absorbs unwanted catoptric light. The optical compensator removes irregularity in the blackness of the LCD panel that would otherwise appear in the black display screen. Thus, degradation of picture quality of a displayed image caused by unwanted catoptric light undergoing multiple reflections in the LCD panel can be eliminated by the absorptive polarizer in collaboration with the optical compensator.
Public/Granted literature
- US20080252801A1 LCD APPARTUS Public/Granted day:2008-10-16
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