公开(公告)号：EP2093747A4

公开(公告)日：2011-04-13

申请号：EP07832506

申请日：2007-11-26

Applicant: PANASONIC CORP

Inventor： IWAKURA NORIYUKI ,  TAKETANI NOBUO ,  YAMASHITA TAKERU ,  TOZAKI SHOZO ,  OOTOMO TAKASHI ,  YOSHINARI HIROSHI

IPC: G09G3/28 ,  G09G3/20 ,  G09G3/288 ,  H04N5/66

CPC classification number: H04N5/147 ,  G09G3/288 ,  G09G2320/0242 ,  G09G2320/103 ,  G09G2330/021 ,  G09G2360/16

Abstract: A scene change detecting circuit (1) detects a scene change of a video. An average luminance level calculating circuit (2) calculates an average luminance level (APL) of a video signal (VD). A luminance overdrive quantity calculating circuit (3) calculates a luminance overdrive quantity (OD) based on the average luminance level (APL). An attenuation circuit (7) operating with time outputs a power consumption limit correction quantity (PA) by attenuating the luminance overdrive quantity (OD) in accordance with a time passed from the time when the scene change is detected. An adder (8) adds the power consumption limit correction quantity (PA) and a reference power consumption limit value (Lp), and the added result is outputted as a power consumption limit quantity (PL). An ABL circuit (4) calculates a luminance limit quantity (BL) based on luminance limit characteristics, the average luminance level (APL) and the power consumption limit quantity (PL). A luminance level control circuit (5) determines display drive conditions (BC) based on the luminance limit quantity (BL). The PDP drive controller (6) drives a display panel (20) based on the video signal (VD) and the display drive conditions (BC).