Electrodeless panel discharge lamp liquid crystal display
US4872741A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1988 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Jul 22, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J65/048
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light transmissive liquid crystal display is illuminated from its rear surface by a juxtaposed flat electrodeless discharge lamp. The lamp includes a pair of glass plates sealably enclosing a fill gas. The front plate carries a phosphor coating on its interior surface and the rear plate carries a phosphor coating and a reflective film. A rectangular array of RF coils behind the rear plate provides excitation for a plasma arc discharge within the fill gas whereby adjacent discharge current paths counter rotate. Ultraviolet radiation emitted by the plasma arc discharge excites the phosphor which produces visible light of uniform brightness that may be varied by varying the RF current amplitude in the coils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.