Laminated retardation optical element, process of producing the same, and liquid crystal display
US7324180B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 5, 2003 |
| Grant date | Jan 29, 2008 |
| Priority date | — |
| Expiry date | Sep 5, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a liquid crystal display 90, a laminated retardation optical element 10 is placed between a polarizer 102A on the incident side and a liquid crystal cell 104, and a ˜/4 retardation film 102C 10 is placed between a polarizer 102B on the emergent side and the liquid crystal cell 104. The laminated retardation optical element 10 comprises: a ˜/4 retardation layer 14 having the function of bringing, to light that passes through this retardation layer, a 15 phase difference corresponding to a quarter of the wavelength of the light; and a C plate-type retardation layer 16 that acts as a negative C plate. The ˜/4 retardation layer 14 and the C plate-type retardation layer 16 are laminated to a transparent substrate 12 in 20 the order mentioned, and are optically bonded to each other. The I/4 retardation layer 14 comprises as its main component a horizontally-aligned, cross-linked nematic liquid crystal, while the C plate-type retardation layer 16 comprises as its main component a 25 cross-linked chiral nematic liquid crystal (a cross-linked nematic liquid crystal and a cross-linked chiral agent) or cross-linked discotic liquid crystal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.