Grid addressed field emission cathode
US5541473A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1993 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Feb 1, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/91
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A grid which controls electron flow, placed between a field emitter cathode and fluorescent anode in a flat cathode ray tube improves focusing, and reduces the switching voltage necessary to stop electron flow. The focusing capabilities of the grid enable increased distance between the cathode and anode, permitting higher anode voltage and use of more efficient phosphors. With the grid, electron flow on/off addressing can be done with drivers operating at less than 30 V, thereby reducing capacitive power loss over prior art addressable arrays and permitting use of inexpensive CMOS control circuitry. The grid's switching capabilities enable the use of a simplified field emitter cathode structure with resistive gate films which increase emitter reliability, emitter life, and, for cathode ray tube displays, the uniformity of the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.