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1. WO2006095576 - DISPLAY DEVICE, CONTRAST ADJUSTING METHOD AND CONTRAST ADJUSTING PROGRAM

Publication Number WO/2006/095576
Publication Date 14.09.2006
International Application No. PCT/JP2006/303323
International Filing Date 23.02.2006
IPC
H04N 5/57 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
44Receiver circuitry
57Control of contrast or brightness
CPC
G09G 2320/0613
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
06Adjustment of display parameters
0613The adjustment depending on the type of the information to be displayed
G09G 2320/0626
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
06Adjustment of display parameters
0626for control of overall brightness
G09G 2320/066
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
06Adjustment of display parameters
066for control of contrast
G09G 2360/16
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2360Aspects of the architecture of display systems
16Calculation or use of calculated indices related to luminance levels in display data
G09G 5/10
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
5Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
10Intensity circuits
H04N 21/4318
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand [VOD]
40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
431Generation of visual interfaces ; for content selection or interaction; Content or additional data rendering
4318by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
Applicants
  • 松下電器産業株式会社 MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. [JP]/[JP] (AllExceptUS)
  • 高場 信道 TAKABA, Nobumichi (UsOnly)
Inventors
  • 高場 信道 TAKABA, Nobumichi
Agents
  • 小谷 悦司 KOTANI, Etsuji
Priority Data
2005-06732510.03.2005JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) DISPLAY DEVICE, CONTRAST ADJUSTING METHOD AND CONTRAST ADJUSTING PROGRAM
(FR) DISPOSITIF D'AFFICHAGE, PROCEDE D'AJUSTEMENT DE CONTRASTE ET PROGRAMME D'AJUSTEMENT DE CONTRASTE
(JA) 表示装置、コントラスト調整方法及びコントラスト調整プログラム
Abstract
(EN)
A feature detecting circuit (4) detects an average luminance, a white area value and a black area value of a video signal, and a control circuit (5) controls a contrast adjusting circuit (2) to more gently change a video signal contrast gain at the time of increase compared with that at the time of reduction, in accordance with changes of the detected average illuminance, the white area value and the black area value. As a result, even when the contrast gain of the video signal is increased or reduced to adjust the contrast of the video signal, excellent video qualities can be obtained in the both cases.
(FR)
La présente invention concerne un circuit de détection de caractéristique (4) à même de détecter une luminance moyenne, une valeur de zone blanche et une valeur de zone noire d'un signal vidéo et un circuit de commande (5) qui commande un circuit d'ajustement de contraste (2) afin de mieux modifier un gain de contraste de signal vidéo lors de la hausse par rapport à la modification effectuée lors de la baisse, en fonction des variations de la luminance moyenne, de la valeur de zone blanche et de la valeur de zone noire détectées. En conséquence, même si le gain de contraste du signal vidéo est augmenté ou réduit afin d'ajuster le contraste du signal vidéo, un affichage vidéo d'excellente qualité est obtenu.
(JA)
 特徴検出回路4は、映像信号の平均輝度、白面積値及び黒面積値を検出し、制御回路5は、検出された平均輝度、白面積値及び黒面積値の変化に応じて映像信号のコントラストゲインを増加させる際の変化を減少させる際の変化より緩やかに行うようにコントラスト調整回路2を制御する。この結果、映像信号のコントラストを調整するために映像信号のコントラストゲインを増加及び減少させても、ともに良好な映像品質を得ることができる。
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