(19)
(11) EP 2 043 079 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.03.2010 Bulletin 2010/11

(43) Date of publication A2:
01.04.2009 Bulletin 2009/14

(21) Application number: 08015642.5

(22) Date of filing: 04.09.2008
(51) International Patent Classification (IPC): 
G09G 3/34(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 28.09.2007 JP 2007253684

(71) Applicant: Sharp Kabushiki Kaisha
Osaka 545-8522 (JP)

(72) Inventors:
  • Takaku, Kohichi
    Tochigi 329-1233 (JP)
  • Ikeyama, Tetsuo
    Tochigi 329-2141 (JP)
  • Yagisawa, Hideto
    Tochigi 329-2141 (JP)

(74) Representative: Müller - Hoffmann & Partner 
Patentanwälte Innere Wiener Strasse 17
81667 München
81667 München (DE)

   


(54) Video displaying apparatus with dynamic brightness control of the backlight


(57) A video displaying apparatus is provided that can change light-modulation rate of a backlight source in accordance with changes in a feature quantity of an input video signal based on a difference between times required for the light adaptation and the dark adaptation. A video displaying apparatus includes a liquid crystal panel (3) that displays an input video signal, a backlight source (9) that applies light to the liquid crystal panel (3), an APL detecting part (6) that detects APL of the input video signal, and a control microcomputer (8) that variably controls a change amount of emission luminance of the backlight source (9) for each predetermined time based on the detected APL. The control microcomputer (8) performs control such that the change amount for the APL of the input video signal changing to a higher quantity becomes greater than the change amount for the APL of the input video signal changing to a lower quantity.







Search report