Large image display apparatus
US4839564A · kind A · utility
13Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Jun 17, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A large image display apparatus comprises a plurality of discharge lamps each having an anode, a cathode and a light emitting tube, a display board having the plurality of discharge lamps thereon, a heating circuit for heating the cathodes of the plurality of discharge lamps, a power supply circuit for generating a rectified high frequency voltage and biasing the plurality of discharge lamps, an image signal generator for generating an image signal, and a control circuit for controlling the quantity of light emitted from each discharge lamp in response to the image signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.