Thin-film EL image display panel
US4366504A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1980 |
| Grant date | Dec 28, 1982 |
| Priority date | — |
| Expiry date | May 29, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To obtain a half-tone display, the device disclosed employs a thin-film EL display panel and practices amplitude and pulse-width modulation wherein the amplitude and pulse-width of a pulse voltage applied to the thin-film EL display panel is varied according to video signals. In one preferred form thereof, a constant current amount or an enabling period of a constant current element provided within a discharge circuit is varied according to video signals, thereby controlling a pre-charge amplitude on the thin-film EL panel. The amount of discharging the pre-charge on the EL panel is under the control video signals. As a result, the brightness of the EL display panel corresponds to video signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.