JPS57188182A - Gamma compensation circut for liquid crystal video display - Google Patents

Gamma compensation circut for liquid crystal video display

Info

Publication number
JPS57188182A
JPS57188182A JP56072594A JP7259481A JPS57188182A JP S57188182 A JPS57188182 A JP S57188182A JP 56072594 A JP56072594 A JP 56072594A JP 7259481 A JP7259481 A JP 7259481A JP S57188182 A JPS57188182 A JP S57188182A
Authority
JP
Japan
Prior art keywords
liquid crystal
gamma compensation
gain
video display
signal
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.)
Pending
Application number
JP56072594A
Other languages
Japanese (ja)
Inventor
Yoshio Nakazawa
Katsuyuki Ikeda
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP56072594A priority Critical patent/JPS57188182A/en
Publication of JPS57188182A publication Critical patent/JPS57188182A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To obtain a liquid crystal video display with correct stepped tone, high contrast and bright display, by erasing gamma compensation for cathode ray tube made for a video signal and making the gamma compensation again for the liquid crystal. CONSTITUTION:A characteristic diagram indicates an input and output voltage characteristic of a gamma compensation circuit of this invention, in which a curve corrected with the inverse characteristics of liquid crystal characteristics is shown after an input video signal is compensated with the gamma of a cathode ray tube. The input video signal is inputted to a TR1 after the reproduction of DC component with C1 and D1. When a black level signal smaller than E1 is applied, D1 and D2 are both turned off and the gain of this circuit is R1/R2. Next, when a signal of intermediate level which is greater than the E1 and smaller than the E1+E2 is applied, the gain is greater as R1/ R2X(R2+R4)/R4, and when a greater white level signal is applied, the gain is further increased and a characteristic required for the liquid crystal display can be obtained. Thus, the liquid crystal video display with the highest contrast, correct stepped tone and bright screen can be obtained by giving the gamma compensation characteristic matched to the liquid crystal.
JP56072594A 1981-05-14 1981-05-14 Gamma compensation circut for liquid crystal video display Pending JPS57188182A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56072594A JPS57188182A (en) 1981-05-14 1981-05-14 Gamma compensation circut for liquid crystal video display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56072594A JPS57188182A (en) 1981-05-14 1981-05-14 Gamma compensation circut for liquid crystal video display

Publications (1)

Publication Number Publication Date
JPS57188182A true JPS57188182A (en) 1982-11-19

Family

ID=13493872

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56072594A Pending JPS57188182A (en) 1981-05-14 1981-05-14 Gamma compensation circut for liquid crystal video display

Country Status (1)

Country Link
JP (1) JPS57188182A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6314129A (en) * 1986-07-07 1988-01-21 Seiko Epson Corp Driving circuit for liquid crystal display body
JPS63271497A (en) * 1987-04-30 1988-11-09 三菱電機株式会社 Liquid crystal display device
FR2656484A1 (en) * 1989-12-22 1991-06-28 Thomson Csf Device for gamma correction of video signals intended for a visual display screen, and television receiver including a screen receiving signals from such a device
US6486863B1 (en) 1992-04-27 2002-11-26 Sony Corporation Apparatus for controlling display and method for gradation conversion

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1289005A (en) * 1969-09-05 1972-09-13
JPS5046216A (en) * 1973-08-29 1975-04-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1289005A (en) * 1969-09-05 1972-09-13
JPS5046216A (en) * 1973-08-29 1975-04-24

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6314129A (en) * 1986-07-07 1988-01-21 Seiko Epson Corp Driving circuit for liquid crystal display body
JPS63271497A (en) * 1987-04-30 1988-11-09 三菱電機株式会社 Liquid crystal display device
FR2656484A1 (en) * 1989-12-22 1991-06-28 Thomson Csf Device for gamma correction of video signals intended for a visual display screen, and television receiver including a screen receiving signals from such a device
US6486863B1 (en) 1992-04-27 2002-11-26 Sony Corporation Apparatus for controlling display and method for gradation conversion

Similar Documents

Publication Publication Date Title
US4319237A (en) Brightness adjusting circuit of liquid crystal matrix panel for picture display
KR870000855B1 (en) Image display apparatus
US6492970B1 (en) Liquid crystal display and driving method therefor
WO1986000483A1 (en) Device for adjusting brightness and contrast
GB1503627A (en) Television video display apparatus
JPS57188182A (en) Gamma compensation circut for liquid crystal video display
KR100777347B1 (en) Apparatus and method for automatic brightness control of liquid crystal display
SE8503872L (en) PICTURE DRIVE CIRCUIT IN A DIGITAL VIDEO SIGNAL PROCESSING SYSTEM
US10854162B2 (en) Gamma voltage regulation circuit, and display device
JPS58164390A (en) Contrast adjustment system of liquid-crystal television
JPS5721176A (en) Deflection circuit for multitube type television camera
JP2569301B2 (en) A / D converter
JPS55153484A (en) Interlace correction circuit for two screen television receiver
JPS614374A (en) Gamma correcting circuit
US3911317A (en) Current bootstrap to reduce interelectrode capacitance effect in a vacuum tube
JP3169721B2 (en) Function generator
JPS6478076A (en) Signal correcting circuit
JPS612193A (en) Contrast signal generation circuit
JPH04271577A (en) Gamma correction system for liquid crystal display device
JPH04260092A (en) Video signal processing circuit for liquid crystal display device
JPS63199323A (en) Video signal correcting circuit
JPS615295A (en) Contrast signal generation circuit
KR100273476B1 (en) Reverse gamma circuit
KR910005342Y1 (en) Picture compensating circuit for color tv
JPS614373A (en) Gamma correcting circuit