Scan inversion symmetric drive
US4975691A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1987 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Jun 16, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0204
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thin-film electroluminescent display panel system has a plurality of vertical column electrodes driven by column driver circuits and a plurality of horizontal row electrodes driven by row driver circuits. The system includes a row driver control circuit that enables the row drivers in a first sequence during a first display frame so that write voltage pulses are applied to the row electrodes in order from the top to the bottom of the display panel. The row driver control circuit enables the row drivers in a second sequence during a second display frame so that the write voltages are applied to the row electrodes in the reverse order from the bottom of the display panel to the top of the display panel. The alternating sequences of application of the write voltages to the row electrodes cause the average residual dc voltage across each of the pixel elements of the display panel to be substantially reduced towards zero so that latent image problems caused by the residual dc voltage is substantially reduced or eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.