Transmissive liquid crystal display having prism lens film for light illumination and wave lens film for light diffusion
US5557433A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1995 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Feb 13, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a TN LCD, a prism lens film and a wave lens film are disposed on the incoming and outgoing sides of a liquid crystal panel, respectively, to obtain an image wide in visual angle and good in its quality. Thus, outgoing light having a sharp directivity, can be obtained from light emitted from a surface illuminant and having a gradually varying directional property by the prism lens film. Further, with a louver film provided in front of the prism lens film, all the light traveling in the diagonal direction can be cut off so that substantially parallel light enter the liquid crystal panel. Since the light in which a variation in retardation is next to nothing, is diffused by the wave lens film, a wide visual-angle representation free of a dependence on the visual angle can be obtained. In order to prevent the image from being turned white due to the reflection of external light and obtain an image of satisfactory quality, which is high in contrast ratio, the front surface of the wave lens film is coated with a multilayer film. Further, both surfaces of the liquid crystal panel and the wave lens film, which are opposed to each other, are coated with multilayer films. Furthermore, an …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.