Color filter for a liquid crystal display
US5695690A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1996 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Sep 9, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133512
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A color filter for a liquid crystal display is made by depositing a layer (22) of colored dye in a pattern on a transparent substrate (20). The pattern is in pixel format, covering most of the substrate surface and leaving portions (23) of the surface between the pixels uncovered. A layer of silver halide (25) covers both the colored dye pixels and the exposed portions of the substrate surface. The silver halide layer is treated by exposing it to light so that those portions of the silver halide layer that lie directly over the colored dye pattern become transparent and those portions of the silver halide layer that lie between the pixels become black, blocking any transmitted light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.