(19)
(11) EP 1 768 088 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.05.2009 Bulletin 2009/20

(43) Date of publication A2:
28.03.2007 Bulletin 2007/13

(21) Application number: 06120447.5

(22) Date of filing: 11.09.2006
(51) International Patent Classification (IPC): 
G09G 3/20(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 22.09.2005 EP 05291973

(71) Applicant: Thomson Licensing
92100 Boulogne-Billancourt (FR)

(72) Inventors:
  • Thebault, Cédric
    92648 Boulogne Cedex (FR)
  • Correa, Carlos
    92648 Boulogne Cedex (FR)
  • Weitbruch, Sébastien
    92648 Boulogne Cedex (FR)

(74) Representative: Le Dantec, Claude 
Thomson, 46, Quai Alphonse Le Gallo
92100 Boulogne-Billancourt
92100 Boulogne-Billancourt (FR)

   


(54) Method and device for encoding luminance values into subfield code words in a display device


(57) The invention relates to a method and a device for encoding the luminance value of a pixel of a picture into a subfield code word in a display device. It can be applied to every display device using a PWM (Pulse Width Modulation) technology and subfields for displaying video picture. It can be used to compensate for any luminance problem that can be estimated. The general idea of the recursive coding is to encode one sub-field after the other in order to be able to compensate for problems occurring on one sub-field with the other sub-fields. More particularly, the bits of a subfield code word are computed recursively one after the other such that the defects (e.g. line load and/or linearity) in the light emission or luminance generated by a bit of the subfield code word can be compensated by the following bits of the subfield code word.







Search report