Driver circuit for an electroluminescent matrix-addressed display
US4554539A · kind A · utility
51Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1982 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Nov 8, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A driver circuit which operates in a switching mode is provided for an electroluminescent matrix-addressed display. The circuit has a row driver which switches a timed ramp voltage to a selected row of the display. A column driver is used to switch selected columns from a low to a high voltage. The column driver is pulse-modulated (PPM or PWM) so that each pulse is timed to coincide with the ramped voltage to provide a differential voltage peak which provides the desired brightness (or grey scale) at the pixel where the driven row and column cross.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.