Drive circuit for video display panel
US4488150A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1983 |
| Grant date | Dec 11, 1984 |
| Priority date | — |
| Expiry date | Jun 28, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed an image display device including a thin film EL element with crossing scan electrodes and data electrodes, a modulation circuit for applying data pulses of a varying amplitude to the respective ones of the data electrodes, and a scan circuit for applying pulses of a fixed amplitude to the respective ones of the scan electrodes. The data pulses are supplied to the data electrodes via voltage follower drive stages which form part of the modulation circuit. Preferably, the data signals are digital-to-analog converted and held in a memory circuit for a while. Upon application of stepwise waveform signals in the memory circuit the data signals are thereafter digital-to-analog converted. The resulting analog amplitude from the digital-to-analog conversion is temporarily held in a gate capacitance and supplied to the EL element via the voltage follower drive stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.