Color liquid crystal display device having special relationship between its isochromatic viewing angle and half-brightness angle
US5694186A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1996 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Sep 10, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A color liquid crystal display device includes a liquid crystal display panel having color filters corresponding to primaries red, green and blue, and a backlight unit disposed behind the liquid crystal display panel. The color liquid crystal display device satisfies a relationship of an isochromatic viewing angle>a half-brightness angle, for at least one azimuthal viewing angle. The half-brightness angle is defined as an angle of a direction inclined with respect to a normal direction of the liquid crystal display panel in which brightness of light emerging from the backlight unit into the liquid crystal display panel becomes 50% of that in the normal direction. The isochromatic viewing angle is defined as a range of viewing angles from the normal direction wherein an absolute shift in an x coordinate of the primary red viewed at off-normal angles is not greater than 0.0314, an absolute shift in a y coordinate of the primary green viewed at off-normal angles is not greater than 0.0273, and an absolute shift in an x coordinate of the primary blue viewed at off-normal angles is not greater than 0.0177, with respect to corresponding coordinates of corresponding primary colors of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.