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1. CN101138238 - Display device, contrast adjusting method and contrast adjusting program

Office China
Application Number 200680007315.2
Application Date 23.02.2006
Publication Number 101138238
Publication Date 05.03.2008
Grant Number 101138238
Grant Date 25.08.2010
Publication Kind B
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 Matsushita Electric Ind Co., Ltd.
松下电器产业株式会社
Inventors Takaba Nobumichi
高场信道
Agents wanghui min
中科专利商标代理有限责任公司 11021
Priority Data 067325/2005 10.03.2005 JP
Title
(EN) Display device, contrast adjusting method and contrast adjusting program
(ZH) 显示装置和对比度调整方法
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.

(ZH)

本发明公开了一种显示装置、对比度调整方法及对比度调整程序。其中,特征检测电路(4),检测视频信号的平均亮度、白面积值和黑面积值,控制电路(5),根据所检测出的平均亮度、白面积值和黑面积值的变化,对对比度调整电路(2)进行控制,使增加视频信号的对比度增益时的变化较减小其对比度增益时的变化更为缓和地进行。其结果,为调整视频信号的对比度,无论增加还是减小视频信号的对比度增益,均可获得良好的图像质量。