JPS6478077A - Signal correction circuit - Google Patents

Signal correction circuit

Info

Publication number
JPS6478077A
JPS6478077A JP23514287A JP23514287A JPS6478077A JP S6478077 A JPS6478077 A JP S6478077A JP 23514287 A JP23514287 A JP 23514287A JP 23514287 A JP23514287 A JP 23514287A JP S6478077 A JPS6478077 A JP S6478077A
Authority
JP
Japan
Prior art keywords
signal
correction
apply
converted
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP23514287A
Other languages
Japanese (ja)
Other versions
JP2590931B2 (en
Inventor
Keiichi Otake
Tsutomu Watanabe
Yohei Kawabata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP23514287A priority Critical patent/JP2590931B2/en
Publication of JPS6478077A publication Critical patent/JPS6478077A/en
Application granted granted Critical
Publication of JP2590931B2 publication Critical patent/JP2590931B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To improve the picture quality of an image display device driven in a pixel unit to the maximum by changing the way to apply correction on data based on the value of an APL (average luminance level). CONSTITUTION:A memory 6 provided with data in which a video signal digitized to several bits is logarithm-converted, a digital multiplier 10 to multiply a logarithm-converted signal by a digitized APL signal, and a memory 11 provided with the data in which a signal outputted from the digital multiplier 10 is index- converted are provided, and flip-flops 8, 9, 13 and 14 to arrange the timing of each signal are provided between respective circuit. In such a way, it is possible to apply the correction in which different ways to apply the correction are changed on the video signal as intended, and to improve the picture quality of the image display device driven in the pixel unit to the maximum.
JP23514287A 1987-09-18 1987-09-18 Signal correction circuit Expired - Lifetime JP2590931B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23514287A JP2590931B2 (en) 1987-09-18 1987-09-18 Signal correction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23514287A JP2590931B2 (en) 1987-09-18 1987-09-18 Signal correction circuit

Publications (2)

Publication Number Publication Date
JPS6478077A true JPS6478077A (en) 1989-03-23
JP2590931B2 JP2590931B2 (en) 1997-03-19

Family

ID=16981675

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23514287A Expired - Lifetime JP2590931B2 (en) 1987-09-18 1987-09-18 Signal correction circuit

Country Status (1)

Country Link
JP (1) JP2590931B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0374969A (en) * 1989-08-16 1991-03-29 Hitachi Ltd Display device
JPH0429473A (en) * 1990-05-23 1992-01-31 Fujitsu General Ltd Automatic contrast adjusting circuit for video signal
JPH0447766A (en) * 1990-06-14 1992-02-17 Matsushita Electric Ind Co Ltd Gain controller for video signal
JPH05219412A (en) * 1991-07-22 1993-08-27 Internatl Business Mach Corp <Ibm> Image display device and operating method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7170477B2 (en) 2000-04-13 2007-01-30 Sharp Kabushiki Kaisha Image reproducing method, image display apparatus and picture signal compensation device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0374969A (en) * 1989-08-16 1991-03-29 Hitachi Ltd Display device
JPH0429473A (en) * 1990-05-23 1992-01-31 Fujitsu General Ltd Automatic contrast adjusting circuit for video signal
JPH0447766A (en) * 1990-06-14 1992-02-17 Matsushita Electric Ind Co Ltd Gain controller for video signal
JPH05219412A (en) * 1991-07-22 1993-08-27 Internatl Business Mach Corp <Ibm> Image display device and operating method thereof

Also Published As

Publication number Publication date
JP2590931B2 (en) 1997-03-19

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