Half tone display driving circuit for crystal matrix panel and half tone display method thereof

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5038139
SERIAL NO

07395595

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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In a half tone display driving circuit for a liquid crystal matrix panel, a pulse for half tone display is phase modulated so that pulse signals which are out of phase relative to each other are applied to adjacent columns of the liquid crystal matrix panel, or from the phase-modulated pulse a gray scale pulse (tone pulse) is prepared in which the frequency of occurrence of voltage edges is decreased. The dephased pulse signals or the gray scale pulse (tone pulse) is used to prevent a decrease in brightness of display when the liquid crystal matrix panel is driven for half tone display.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI, LTD.TOKYO14066
Hitachi Video Engineering, Inc.TOKYO12

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujisawa, Kazuhiro Fujisawa, JP 21 235
Inuzuka, Tatsuhiro Kamakura, JP 24 426
Kinugawa, Kiyoshige Chiba, JP 41 945
Konuma, Satoshi Yokohama, JP 12 191
Mano, Hiroyuki Yokohama, JP 82 849
Tsunekawa, Satoru Tachikawa, JP 33 469

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 4859998 Apparatus and method for driving signal electrodes for liquid crystal display devices 19 1988
 
YAMAHA CORPORATION (1)
* 4779083 Display control system 49 1986
 
SEIKO EPSON CORPORATION (1)
* 4743096 Liquid crystal video display device having pulse-width modulated "ON" signal for gradation display 80 1987
 
STC PLC, A BRITISH COMPANY (1)
* 4511926 Scanning liquid crystal display cells 43 1983
 
KABUSHIKI KAISHA TOSHIBA (1)
* 4748510 Drive circuit for liquid crystal display device 29 1987
 
CASIO COMPUTER CO., LTD. (1)
* 4775891 Image display using liquid crystal display panel 54 1985
 
TEKTRONIX, INC. (1)
* 4857906 Complex waveform multiplexer for liquid crystal displays 21 1987
 
CANON KABUSHIKI KAISHA (1)
* 4795239 Method of driving a display panel 42 1986
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
SHARP KABUSHIKI KAISHA (4)
* 5541619 Display apparatus and method of driving display panel 7 1993
* 5977944 Data signal output circuit for an image display device 13 1997
* 7764263 Display apparatus and driver circuit of display apparatus having precharged and written simultaneously without collision 0 2005
* 2005/0179,635 Display apparatus and driver circuit of display apparatus 6 2005
 
SEIKO EPSON CORPORATION (1)
* 7855710 Electro-optical device, circuit for driving electro-optical device, method of driving electro-optical device, and electronic apparatus 2 2005
 
BOE TECHNOLOGY GROUP CO., LTD. (10)
* 6337677 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 16 1998
7271793 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 0 2001
7940244 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 3 2006
7932886 Liquid crystal display device, driving method for liquid crystal display devices, and inspection for liquid crystal display devices 3 2006
* 2006/0279,515 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 2 2006
* 2006/0262,075 Liquid crystal display device, driving method for liquid crystal display devices, and inspection for liquid crystal display devices 3 2006
7782311 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 1 2007
* 2007/0109,243 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 2 2007
8704747 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 0 2011
9275588 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 0 2013
 
MITSUBISHI ELECTRIC CORPORATION (1)
* 6980192 Liquid crystal display, integrated circuit for use therein, and driving method and driver of liquid crystal display 4 1999
 
SEMICONDUCTOR ENERGY LABORATORY CO., LTD. (3)
* 6731264 Driver circuit for display device 33 2001
7432905 Driver circuit for display device 1 2004
* 2004/0183,766 Driver circuit for display device 4 2004
 
Thomson, S.A. (1)
* 5103112 Apparatus for generating control pulses of variable width, as for driving display devices 2 1990
 
PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. (1)
* 5583530 Liquid crystal display method and apparatus capable of making multi-level tone display 38 1993
 
GEC-MARCONI LIMITED (1)
* 5241392 Liquid crystal display 2 1991
* Cited By Examiner