Retardation compensating plate to compensate residual retardation of a liquid crystal panel, a compensator, a liquid crystal display device, and a projection image display apparatus having the same
US8018557B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2006 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Jun 27, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/3083
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A retardation compensator 40 for compensating for residual retardation of a liquid crystal panel 11 includes a retardation compensating plate 50 having birefringence. An in-plane retardation R0c of the retardation compensating plate 50 and an in-plane retardation R0p of the liquid crystal panel 11 satisfy a relationship of 1<R0c/R0p≦10, thereby allowing changes in the amount of compensated retardation among rotation angles occurring when the retardation compensating plate 50 is set with respect to the liquid crystal panel 11 to be confined within narrow limits. Therefore, the contrast can be adjusted readily, and variations in residual retardation among the individual liquid crystal panels 11 can be accommodated flexibly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.