Active matrix in-plane switching type liquid crystal display and compensator arrangement
US7164458B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2002 |
| Grant date | Jan 16, 2007 |
| Priority date | — |
| Expiry date | Dec 27, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is an in-plane switching active matrix type liquid crystal display with greater improvements on color shifting and contrast. The liquid crystal display comprises an in-plane switching type liquid crystal display panel having an active device substrate, an opposing substrate and a liquid crystal layer held sandwiched between the active device substrate and the opposing substrate, a first polarizer laid out on one side of the liquid crystal display panel, a second polarizer laid out on the opposite side of the liquid crystal display panel, first to third optical compensators placed in order between the liquid crystal display panel and the first polarizer, and a fourth optical compensator placed between the liquid crystal display panel and the second polarizer. As the first to fourth optical compensators are provided to compensate for retardation of the liquid crystal layer and retardation of the polarizers, black stretching does not occur even when observation is made from any viewing angle, and a reduction in contrast does not occur. Nor does color shifting occur at the time of displaying black.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.