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JPS6442993A - Liquid crystal television equipment - Google Patents

Liquid crystal television equipment

Info

Publication number
JPS6442993A
JPS6442993A JP19893787A JP19893787A JPS6442993A JP S6442993 A JPS6442993 A JP S6442993A JP 19893787 A JP19893787 A JP 19893787A JP 19893787 A JP19893787 A JP 19893787A JP S6442993 A JPS6442993 A JP S6442993A
Authority
JP
Japan
Prior art keywords
liquid crystal
video signal
voltage
common electrode
direct current
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
JP19893787A
Other languages
Japanese (ja)
Other versions
JPH0628427B2 (en
Inventor
Nobukazu Hosoya
Kazumichi Nohara
Hidehiro Ugaki
Shigeo Yoshida
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP62198937A priority Critical patent/JPH0628427B2/en
Publication of JPS6442993A publication Critical patent/JPS6442993A/en
Publication of JPH0628427B2 publication Critical patent/JPH0628427B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

PURPOSE:To realize the automatic luminance control of a liquid crystal television equipment by detecting current flowing to the common electrode of a liquid crystal panel and controlling the direct current level of a video signal with the aid of the detection output. CONSTITUTION:The current flows to the common electrode of the liquid crystal panel 1 in a moment when the video signal of 1H component is impressed to a subscribed line by a horizontal driver 3. At that time, voltage which appears at the both sides of a resistance R is inverted by a second porality inversion circuit 7, held in an 1H term by a sample hold circuit 8, then is passed through a low-pass filter 9 and is made to be direct current. Besides, this voltage is previously compared with reference voltage corresponding to a white level by a comparator 11. Therefore, since the comparatively high current flows to the common electrode when the amplitude of the video signal rises over the white level, the negative voltage appears to the output of the comparator 11. Thus this voltage is added by an adder 4 and the direct current of the video signal is controlled.
JP62198937A 1987-08-08 1987-08-08 Liquid crystal display Expired - Fee Related JPH0628427B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62198937A JPH0628427B2 (en) 1987-08-08 1987-08-08 Liquid crystal display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62198937A JPH0628427B2 (en) 1987-08-08 1987-08-08 Liquid crystal display

Publications (2)

Publication Number Publication Date
JPS6442993A true JPS6442993A (en) 1989-02-15
JPH0628427B2 JPH0628427B2 (en) 1994-04-13

Family

ID=16399450

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62198937A Expired - Fee Related JPH0628427B2 (en) 1987-08-08 1987-08-08 Liquid crystal display

Country Status (1)

Country Link
JP (1) JPH0628427B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995000874A1 (en) * 1993-06-18 1995-01-05 Hitachi, Ltd. Liquid crystal matrix display device and method of driving the same
JP2005284057A (en) * 2004-03-30 2005-10-13 Seiko Epson Corp Electro-optical device and electronic equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5315773A (en) * 1976-07-28 1978-02-14 Hitachi Ltd Mis type semiconductor device and its production
JPS58147792A (en) * 1982-02-26 1983-09-02 株式会社東芝 Liquid crystal display
JPS61164385A (en) * 1985-01-16 1986-07-25 Seiko Epson Corp Liquid crystal television set

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5315773A (en) * 1976-07-28 1978-02-14 Hitachi Ltd Mis type semiconductor device and its production
JPS58147792A (en) * 1982-02-26 1983-09-02 株式会社東芝 Liquid crystal display
JPS61164385A (en) * 1985-01-16 1986-07-25 Seiko Epson Corp Liquid crystal television set

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995000874A1 (en) * 1993-06-18 1995-01-05 Hitachi, Ltd. Liquid crystal matrix display device and method of driving the same
JP2005284057A (en) * 2004-03-30 2005-10-13 Seiko Epson Corp Electro-optical device and electronic equipment

Also Published As

Publication number Publication date
JPH0628427B2 (en) 1994-04-13

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees