Device for generating electrons, and display device
US5315207A · kind A · utility
19Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1990 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | Apr 4, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/485
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A planar electron-optical lens is obtained on a semiconductor cathode surface by providing an extra electrode (16) around the gate electrode (14). Dependent on the applied voltage, this configuration operates, for example, as a positive lens which supplies parallel beams without dispersion, suitable for thin, flat display devices. A large positioning tolerance is obtained due to the inherent magnification of the beam diameter in the semiconductor device, while a grid can be dispensed with.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.