EP 1879172 A1 20080116 - Aging compensation for display boards comprising light emitting elements
Title (en)
Aging compensation for display boards comprising light emitting elements
Title (de)
Alterungskompensation für Anzeigetafeln mit lichtemittierenden Elementen
Title (fr)
Compensation de vieillissement des tableaux d'affichage comprenant des éléments émettant de la lumière
Publication
Application
Priority
- EP 06014750 A 20060714
- EP 07013567 A 20070711
Abstract (en)
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 o ne reference light emitting element (35) which, during use of the display board (30) is not driven. At the time of a n 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.
IPC 8 full level
G09G 3/32 (2006.01)
CPC (source: EP)
G09G 3/3208 (2013.01); G09G 3/20 (2013.01); G09G 2300/026 (2013.01); G09G 2320/029 (2013.01); G09G 2320/043 (2013.01); G09G 2320/045 (2013.01); G09G 2320/0693 (2013.01); G09G 2360/145 (2013.01)
Citation (search report)
- [XA] EP 1335430 A1 20030813 - EASTMAN KODAK CO [US]
- [XAY] WO 2004025615 A1 20040325 - KONINKL PHILIPS ELECTRONICS NV [NL], et al
- [Y] WO 02097774 A2 20021205 - PRINTABLE FIELD EMITTERS LTD [GB], et al
- [A] EP 0425210 A2 19910502 - EEV LTD [GB]
- [A] US 2006119592 A1 20060608 - WANG JIAN [US], et al
- [AD] EP 1158483 A2 20011128 - EASTMAN KODAK CO [US]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
DOCDB simple family (application)
EP 07013567 A 20070711