CA2026340A1 - Control of brightness level adapted to control of picture - Google Patents

Control of brightness level adapted to control of picture

Info

Publication number
CA2026340A1
CA2026340A1 CA2026340A CA2026340A CA2026340A1 CA 2026340 A1 CA2026340 A1 CA 2026340A1 CA 2026340 A CA2026340 A CA 2026340A CA 2026340 A CA2026340 A CA 2026340A CA 2026340 A1 CA2026340 A1 CA 2026340A1
Authority
CA
Canada
Prior art keywords
control
picture
brightness level
level adapted
level
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
CA2026340A
Other languages
French (fr)
Other versions
CA2026340C (en
Inventor
William Adamson Lagoni
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.)
Technicolor USA Inc
Original Assignee
Thomson Consumer Electronics Inc
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 Thomson Consumer Electronics Inc filed Critical Thomson Consumer Electronics Inc
Publication of CA2026340A1 publication Critical patent/CA2026340A1/en
Application granted granted Critical
Publication of CA2026340C publication Critical patent/CA2026340C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H04N5/59—Control of contrast or brightness in dependence upon beam current of cathode ray tube

Abstract

A level setting means for adjusting the brightness (30) of a television receiver is modified by the setting of an amplitude control means for adjusting the contrast (20) such that the maximum brightness level of the image on a CRT is modified in direct relationship to the adjusted level of contrast. <IMAGE>
CA002026340A 1989-11-01 1990-09-27 Control of brightness level adapted to control of picture Expired - Fee Related CA2026340C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/438,930 US4982287A (en) 1989-11-01 1989-11-01 Control of brightness level adapted to control of contrast
US438,930 1989-11-01

Publications (2)

Publication Number Publication Date
CA2026340A1 true CA2026340A1 (en) 1991-05-02
CA2026340C CA2026340C (en) 1994-09-13

Family

ID=23742624

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002026340A Expired - Fee Related CA2026340C (en) 1989-11-01 1990-09-27 Control of brightness level adapted to control of picture

Country Status (15)

Country Link
US (1) US4982287A (en)
EP (1) EP0425993B1 (en)
JP (1) JP2899680B2 (en)
KR (1) KR100205492B1 (en)
CN (1) CN1035149C (en)
AT (1) ATE152872T1 (en)
CA (1) CA2026340C (en)
DE (1) DE69030638T2 (en)
ES (1) ES2101684T3 (en)
FI (1) FI98678C (en)
MY (1) MY105993A (en)
PT (1) PT95681B (en)
RU (1) RU2130235C1 (en)
SG (1) SG119128A1 (en)
TR (1) TR25041A (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5134490A (en) * 1989-04-18 1992-07-28 Thomson Consumer Electronics, Inc. Beam current limiter with brightness control threshold extension
KR920007607B1 (en) * 1989-09-01 1992-09-08 삼성전자 주식회사 Contrast adjusting circuit in digital television receiver
US5125046A (en) * 1990-07-26 1992-06-23 Ronald Siwoff Digitally enhanced imager for the visually impaired
US5847773A (en) * 1991-08-30 1998-12-08 Thomson Consumer Electronics, Inc. Video system including apparatus for deactivating an automatic control arrangement
JPH0594146A (en) * 1991-10-02 1993-04-16 Mitsubishi Electric Corp Luminance control circuit
US5191420A (en) * 1991-12-16 1993-03-02 Thomson Consumer Electronics, Inc. Video system with feedback controlled "white stretch" processing and brightness compensation
US5200829A (en) * 1991-12-16 1993-04-06 Thomson Consumer Electronics, Inc. Contrast beam current limiting arrangement with secondary brightness beam current limiting provisions
KR970000851B1 (en) * 1992-09-01 1997-01-20 마쯔시다덴기산교 가부시기가이샤 Video signal processor
DE69333238D1 (en) * 1992-11-17 2003-11-13 Koninkl Philips Electronics Nv Display device with a correction circuit and correction circuit for use in such an arrangement
US5446483A (en) * 1993-04-19 1995-08-29 Advanced Micro Devices, Inc. Variable speed controller for an electronic display
JPH06311396A (en) * 1993-04-27 1994-11-04 Mitsubishi Electric Corp Video circuit
JP3267061B2 (en) * 1994-08-29 2002-03-18 松下電器産業株式会社 ABL circuit, ACL circuit, luminance / color difference signal processing circuit, and television receiver
KR970005942B1 (en) * 1994-09-16 1997-04-22 엘지전자 주식회사 Automatic modification apparatus for contrast in a monitor
KR0179844B1 (en) * 1995-10-06 1999-05-01 문정환 Brightness control circuit of television screen corner
KR100382629B1 (en) * 2000-10-05 2003-05-09 오승현 Apparatus, method and program recording media for correcting displayed color
KR100497395B1 (en) * 2003-06-30 2005-06-23 삼성전자주식회사 Method for setting image quality automatically
CN100405455C (en) * 2004-02-23 2008-07-23 鸿富锦精密工业（深圳）有限公司 Set and method for adjusting brightness and contrast
JP4387220B2 (en) * 2004-02-24 2009-12-16 株式会社日立製作所 Image display method and apparatus
US7605872B2 (en) * 2005-06-20 2009-10-20 Mediatek Inc. Video contrast adjusting method and system
WO2013048994A1 (en) * 2011-09-26 2013-04-04 Magna Electronics, Inc. Vehicle camera image quality improvement in poor visibility conditions by contrast amplification

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735029A (en) * 1971-04-09 1973-05-22 D Sunstein Method and apparatus for maintaining the beam current of an image-display device within controlled limits
GB1400427A (en) * 1971-11-08 1975-07-16 Rca Corp Video signal processing apparatus
JPS4944120U (en) * 1972-07-20 1974-04-18
GB1407272A (en) * 1972-10-17 1975-09-24 Tektronix Inc Brightness and contrast control circuit
US3928867A (en) * 1974-05-10 1975-12-23 Gen Electric Television receiver with picture level control
US3961361A (en) * 1975-05-23 1976-06-01 Rca Corporation Gain control arrangement useful in a television signal processing system
US4091419A (en) * 1976-06-22 1978-05-23 Rhee Dennis W Combination contrast/brightness control for a television receiver
US4126884A (en) * 1977-05-05 1978-11-21 Rca Corporation Kinescope beam current limiter employing automatic sequential control of image contrast and brightness to limit beam current
US4506292A (en) * 1982-06-14 1985-03-19 Motorola, Inc. Video driver circuit and method for automatic gray scale adjustment and elimination of contrast tracking errors
JPS5986974A (en) * 1982-11-11 1984-05-19 Sharp Corp Automatic luminance limiting circuit
JPS6043981A (en) * 1983-08-22 1985-03-08 Sony Corp Beam current limiting circuit
US4654717A (en) * 1985-05-20 1987-03-31 Rca Corporation Cathode-ray tube arc-over protection for digital data in television display apparatus
JPS62281575A (en) * 1986-05-29 1987-12-07 Mitsubishi Electric Corp Contrast and brightness adjusting circuit
JPS6348979A (en) * 1986-08-19 1988-03-01 Fuji Photo Film Co Ltd Contrast adjustment device for crt

Also Published As

Publication number Publication date
RU2130235C1 (en) 1999-05-10
CA2026340C (en) 1994-09-13
JPH03169179A (en) 1991-07-22
PT95681A (en) 1992-05-29
EP0425993B1 (en) 1997-05-07
JP2899680B2 (en) 1999-06-02
KR100205492B1 (en) 1999-07-01
EP0425993A2 (en) 1991-05-08
FI98678C (en) 1997-07-25
FI98678B (en) 1997-04-15
MY105993A (en) 1995-02-28
ES2101684T3 (en) 1997-07-16
PT95681B (en) 1998-07-31
DE69030638D1 (en) 1997-06-12
CN1035149C (en) 1997-06-11
KR910011062A (en) 1991-06-29
SG119128A1 (en) 2006-02-28
US4982287A (en) 1991-01-01
CN1051477A (en) 1991-05-15
TR25041A (en) 1992-09-01
EP0425993A3 (en) 1992-03-04
FI905264A0 (en) 1990-10-25
ATE152872T1 (en) 1997-05-15
DE69030638T2 (en) 1997-09-04

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed