Low-voltage cathode for scrubbing cathodoluminescent layers for field emission displays and method
US6420828B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2001 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Sep 19, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2329/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Faceplates for field emission displays having novel cathodoluminescent layers are disclosed. In one embodiment, a faceplate includes a cathodoluninescent layer exposed to electrons (scrubbed) in a vacuum, the electron's having a current density of greater than one hundred microamperes per square centimeter. The cathodoluninescent layer may be reversibly darkened by the scrubbing. In one alternate aspect, the cathodoluninescent layers are irradiated with an electron beam having a duty cycle duty cycle of between ten and one hundred percent. In alternate aspects, an accelerating voltage may be maintained between the cathodoluminescent layer and a source of electrons, and the accelerating voltage may be dithered to treat the cathodoluminescent layer to varying depths. Significantly, the scrubbed faceplate has significantly enhanced performance and increased usefull life compared to faceplates that have not been scrubbed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.