Optical devices such as flat-panel cathode ray tube, having raised black matrix
US5576596A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1995 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | May 25, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2329/8645
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An optical device contains first and second plates (302 and 303), a pattern of ridges (314) situated over the first plate, light-emissive regions (313) situated in spaces between the ridges, electron-emissive elements (309) situated over the second plate, and supporting structure (308) that maintains a desired spacing between the plates. The electron-emissive elements emit electrons that strike the light-emissive regions, causing them to produce light of various colors. The ridges, which extend further away from the first plate than the light-emissive regions, are substantially non-emissive of light when hit by electrons. Each ridge includes a dark region formed with metal, ceramic, semiconductor, or/and carbide. The ridges thereby form a raised black matrix that improves contrast and color purity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.