(19)
(11) EP 2 453 433 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.06.2014 Bulletin 2014/25

(43) Date of publication A2:
16.05.2012 Bulletin 2012/20

(21) Application number: 11189176.8

(22) Date of filing: 15.11.2011
(51) International Patent Classification (IPC): 
G09G 3/32(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 15.11.2010 US 946601

(71) Applicant: Ignis Innovation Inc.
Waterloo, Ontario N2V 2C5 (CA)

(72) Inventors:
  • Nathan, Arokia
    Cambridge, CB3 0DL (GB)
  • Chaji, Gholamreza
    Waterloo, Ontario N2V 2S3 (CA)
  • Alexander, Stefan
    Elmira, Ontario N3B 2N1 (CA)
  • Servati, Peyman
    Vancouver, British Columbia V6K 2T6 (CA)
  • I-Heng Huang, Richard
    Waterloo, Ontario N2V 2L1 (CA)
  • Church, Corbin
    Westmount, Québec H34 2S8 (CA)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser 
Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) System and method for compensation of non-uniformities in light emitting device displays


(57) A system and method for operating a display at a constant luminance even as some of the pixels in the display are degraded over time. Each pixel in the display is configured to emit light when a voltage is supplied to the pixel's driving circuit, which causes a current to flow through a light emitting element. Degraded pixels are compensated by supplying their respective driving circuits with greater voltages. The display data is scaled by a compression factor less than one to reserve some voltage levels for compensating degraded pixels. As pixels become more degraded, and require additional compensation, the compression factor is decreased to reserve additional voltage levels for use in compensation.







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