Faceplates having scrubbed cathodoluminescent layers for field emission displays
US6414429B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2001 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Sep 18, 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 cathodoluminescent layer exposed to electron irradiation with an electron curt having a kinetic energy of less than one thousand electron volts, The electron irradiation (scrubbing) may be performed in a vacuum, and the cathodoluminescent layer may be reversibly darkened by the scrubbing. The cathodoluminescent layers may be formed on a transparent conductive layer formed on a transparent insulating viewing screen. In one aspect, the cathodoluminescent layers are irradiated with electrons having a density of greater than one hundred microamperes/cm2. 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 vary depths. Significantly, the scrubbed faceplate has significantly enhanced performance and increased useful life compared to faceplates that have not been scrubbed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.