Field emission display having circuit for preventing emission to grid
US6169371A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2000 |
| Grant date | Jan 2, 2001 |
| Priority date | — |
| Expiry date | Feb 2, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2329/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A field emission display includes an array of emitter sites, a grid for controlling electron emission from the emitter sites, and a display screen. The field emission display also includes a control circuit for controlling the grid for preventing emission to grid. The control circuit includes a high impedance grid bias path, and a low impedance grid bias path. In addition, the control circuit includes a sensing-switching circuit for sensing an anode voltage at the display screen, and switching from the high impedance to the low impedance grid bias path upon detection of a threshold anode voltage. An alternate embodiment control circuit is configured to provide a programmable delay during enabling of the grid to insure that the display screen reaches the threshold voltage prior to electron emission. An alternate embodiment field emission display includes a focus ring that is controlled to prevent emission to grid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.