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1. US20080174700 - Display device, contrast adjusting method and contrast adjusting program

Office United States of America
Application Number 11886037
Application Date 23.02.2006
Publication Number 20080174700
Publication Date 24.07.2008
Grant Number 08305399
Grant Date 06.11.2012
Publication Kind B2
IPC
G09G 5/10
GPHYSICS
09EDUCATING; 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
Applicants Panasonic Corporation
Agents Wenderoth, Lind & Ponack, L.L.P.
Priority Data 2005-067325 10.03.2005 JP
Title
(EN) Display device, contrast adjusting method and contrast adjusting program
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.