JPS5662487A - Automatic luminance adjusting circuit - Google Patents

Automatic luminance adjusting circuit

Info

Publication number
JPS5662487A
JPS5662487A JP13966079A JP13966079A JPS5662487A JP S5662487 A JPS5662487 A JP S5662487A JP 13966079 A JP13966079 A JP 13966079A JP 13966079 A JP13966079 A JP 13966079A JP S5662487 A JPS5662487 A JP S5662487A
Authority
JP
Japan
Prior art keywords
gain
video amplifier
circuit
luminance
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
JP13966079A
Other languages
Japanese (ja)
Other versions
JPS6324356B2 (en
Inventor
Yutaka Tanaka
Atsushi Matsuzaki
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP13966079A priority Critical patent/JPS5662487A/en
Publication of JPS5662487A publication Critical patent/JPS5662487A/en
Publication of JPS6324356B2 publication Critical patent/JPS6324356B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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

Abstract

PURPOSE:To enable to emphasize the luminance of playback screen, when the input level to a video amplifier is small, by constituting that the level of drive signal can almost be at full range regradless of the input level of video amplifier, in an automatic luminance adjusting circuit for cathode-ray tubes. CONSTITUTION:The gain of a video amplifier circuit 25 is taken greater, and when an input video signal level is small, since the series circuit of diodes DR, DG, DB and a Zener diode DZ is nonconductive, the control output of a gain control circuit 29 is zero, and the gain of a video amplifier circuit 25 is greater. When either of cathode voltages KR, KG, KB of a cathode ray tube 10 is greater, either one of the said series circuit is conductive, and an output is obtained at a gain control circuit 29 to decrease the gain of the video amplifier circuit 25. Thus, since the gain of the video amplifier circuit is greater in comparison with conventional circuits, even if the input signal level is small, the luminance of playback screen can be emphasized, and when the input level is greater, the gain of the video amplifier circuit is lowered to avoid the luminance of playback screen unnecessarily made stronger.
JP13966079A 1979-10-29 1979-10-29 Automatic luminance adjusting circuit Granted JPS5662487A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13966079A JPS5662487A (en) 1979-10-29 1979-10-29 Automatic luminance adjusting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13966079A JPS5662487A (en) 1979-10-29 1979-10-29 Automatic luminance adjusting circuit

Publications (2)

Publication Number Publication Date
JPS5662487A true JPS5662487A (en) 1981-05-28
JPS6324356B2 JPS6324356B2 (en) 1988-05-20

Family

ID=15250436

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13966079A Granted JPS5662487A (en) 1979-10-29 1979-10-29 Automatic luminance adjusting circuit

Country Status (1)

Country Link
JP (1) JPS5662487A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640839A1 (en) * 1988-12-20 1990-06-22 Portenseigne Radiotechnique VIDEO IMAGE REPRODUCTION DEVICE WITH CONTRAST ADJUSTMENT, AND METHOD OF ADJUSTING THE CONTRAST OF SUCH A REPRODUCTION DEVICE

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5126835A (en) * 1974-08-28 1976-03-05 Kojin Kk

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5126835A (en) * 1974-08-28 1976-03-05 Kojin Kk

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640839A1 (en) * 1988-12-20 1990-06-22 Portenseigne Radiotechnique VIDEO IMAGE REPRODUCTION DEVICE WITH CONTRAST ADJUSTMENT, AND METHOD OF ADJUSTING THE CONTRAST OF SUCH A REPRODUCTION DEVICE

Also Published As

Publication number Publication date
JPS6324356B2 (en) 1988-05-20

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