System for modulating a flat panel image display device
US4077054A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1977 |
| Grant date | Feb 28, 1978 |
| Priority date | — |
| Expiry date | Feb 17, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/70
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Electron beams in a cathodoluminescent display device are modulated utilizing a means for generating a voltage proportional to the instantaneous electrical charge on the cathodoluminescent screen and means for generating a periodic reference waveform having a peak voltage proportional to a sampling of the incoming video signal. A differential amplifier compares the voltage proportional to the electrical charge on the screen to the instantaneous voltage of the reference waveform. A regulator controls the flow of electrons to the screen so as to force the voltage which is proportional to the instantaneous screen charge to approximate the reference waveform voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.