Method of driving light emitting element array
US7385575B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 2004 |
| Grant date | Jun 10, 2008 |
| Priority date | — |
| Expiry date | Apr 26, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0295
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An exposure system is provided with a light emitting element array formed by a plurality of light emitting elements formed at the intersections of anodes and cathodes arranged in matrix so that a photosensitive material is exposed to an image formed on the light emitting element array. A method of driving the light emitting element array includes the steps of driving the light emitting elements in constant-current drive before and/or during an exposure period, measuring and storing in a memory means the anode voltage of each light emitting element at that time, and driving the light emitting elements in constant-voltage drive at a voltage equal to the measured anode voltage at least during beginning of the subsequent exposure periods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.