JPS6473887A - Gamma correction circuit - Google Patents

Gamma correction circuit

Info

Publication number
JPS6473887A
JPS6473887A JP23018887A JP23018887A JPS6473887A JP S6473887 A JPS6473887 A JP S6473887A JP 23018887 A JP23018887 A JP 23018887A JP 23018887 A JP23018887 A JP 23018887A JP S6473887 A JPS6473887 A JP S6473887A
Authority
JP
Japan
Prior art keywords
primary color
gamma correction
level
color signal
resistor
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
JP23018887A
Other languages
Japanese (ja)
Other versions
JP2563373B2 (en
Inventor
Shigemitsu Yamade
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 JP62230188A priority Critical patent/JP2563373B2/en
Publication of JPS6473887A publication Critical patent/JPS6473887A/en
Application granted granted Critical
Publication of JP2563373B2 publication Critical patent/JP2563373B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To improve a frequency characteristic by performing the gamma correction of a video signal by providing a means to detect the level of a reference pulse on the middle way to a video amplifier circuit, and a non-linear amplifier circuit capable of obtaining the reference level of a non-linear operation by a detected voltage level. CONSTITUTION:The reference pulses B and C are formed by utilizing each output of a horizontal deflection circuit and a vertical deflection circuit, and are inserted to a prescribed horizontal period H in the vertical blanking period of primary color signals R, G and B. A gamma correction circuit performs the gamma correction by utilizing the automatic adjusting circuit 1 of white balance. In other words, when a primary color signal D becomes larger than a prescribed value for the voltage level of the period of a reference pulse signal C, a transistor 18 is energized, and a resistor 18 is inserted to a primary color signal transmission line. When the level of the primary color signal becomes larger moreover, a state where a resistor 20 is inserted to the primary color signal transmission line is generated, and the gamma correction is performed. Therefore, it is possible to improve the frequency characteristic without necessitating to insert a resistor large in resistance in series with the cathode of a cathode-ray tube as in a conventional device.
JP62230188A 1987-09-14 1987-09-14 Gamma correction circuit Expired - Lifetime JP2563373B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62230188A JP2563373B2 (en) 1987-09-14 1987-09-14 Gamma correction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62230188A JP2563373B2 (en) 1987-09-14 1987-09-14 Gamma correction circuit

Publications (2)

Publication Number Publication Date
JPS6473887A true JPS6473887A (en) 1989-03-20
JP2563373B2 JP2563373B2 (en) 1996-12-11

Family

ID=16903970

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62230188A Expired - Lifetime JP2563373B2 (en) 1987-09-14 1987-09-14 Gamma correction circuit

Country Status (1)

Country Link
JP (1) JP2563373B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03185989A (en) * 1989-12-15 1991-08-13 Hitachi Ltd Automatic white balance adjustment circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03185989A (en) * 1989-12-15 1991-08-13 Hitachi Ltd Automatic white balance adjustment circuit

Also Published As

Publication number Publication date
JP2563373B2 (en) 1996-12-11

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