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1. EP1858257 - DISPLAY DEVICE, CONTRAST ADJUSTING METHOD AND CONTRAST ADJUSTING PROGRAM

Office European Patent Office
Application Number 06714463
Application Date 23.02.2006
Publication Number 1858257
Publication Date 21.11.2007
Publication Kind B1
IPC
H04N 5/57
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
44Receiver circuitry
57Control of contrast or brightness
CPC
H04N 5/57
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
44Receiver circuitry ; for the reception of television signals according to analogue transmission standards;
57Control of contrast or brightness
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
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
Applicants PANASONIC CORP
Inventors TAKABA NOBUMICHI
Designated States
Priority Data 2005067325 10.03.2005 JP
Title
(DE) DISPLAY-EINRICHTUNG, KONTRASTEINSTELLVERFAHREN UND KONTRASTEINSTELLPROGRAMM
(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
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 such that a contrast gain of the video signal is more moderately increased than decreased according to changes of the detected average luminance, white area value and black area value. As a result, a good video quality can be obtained upon both increasing and decreasing the contrast gain of the video signal to adjust the contrast of the video signal.

(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.