Pulse burst panel drive for electroluminescent displays
US4839563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1987 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | May 28, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thin film electroluminescent display device energized with a rapid burst of pulses during a time less than the decay time of the phosphor yields substantially increased light output. Preferably, a burst of between two and forty pulses having a duration in the range between 5 and 20 microseconds and having alternating polarities is applied to the device. The pulse burst technique is advantageously applied to a dot matrix type EL display panel operating at a 60 Hz refresh rate. For a 512.times.256 element display panel, each row is addressed for approximately 65 microseconds, and four pulses of about 12-15 microseconds each are applied to the EL pixels during each row address time. The pulse burst technique provides increased brightness while minimizing the retained image problem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.