Drive circuit for operating electroluminescent display with enhanced contrast
US4837566A · kind A · utility
28Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1988 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Jan 27, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0275
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved drive circuit for operating an electroluminescent display includes a circuit for biasing column and row drivers to maximize the energization voltage for illuminated pixels without reducing the contrast of the display. Interface circuitry is also provided for detecting the beginning of valid data for each line to be displayed, checking the selected display mode of the line and adjusting the timing of a system clock to completely and uniformly display characters in the 40-column, 80-column or graphics display mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.