Aging compensation for display boards comprising light emitting elements
US8106858B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 2007 |
| Grant date | Jan 31, 2012 |
| Priority date | — |
| Expiry date | Jul 26, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/145
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a display board (30) comprising an array of light emitting elements (31), a driving means (32) for driving the light emitting elements (31) with image data, and an aging determination means (33). The aging determination means (33) comprises one or more light emitting elements for emitting light representative of the light emitted by the light emitting elements (31) of the display board (30), and at least one reference light emitting element (35) which, during use of the display board (30) is not driven. At the time of an intermediate calibration, the at least one reference light emitting element (35) is driven with calibration data and the light emitted by the reference light emitting element (35) is measured, as well as light representative of the light emitted by the light emitting elements. The difference between the light emitted by the at least one reference light emitting element (35) and the light representative of the light emitted by the light emitting elements is a measure for the degree of aging of the light emitting elements (31) of the array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.