US Patent No: 5,038,139

Number of patents in Portfolio can not be more than 2000

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

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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.TOKYO31388
HITACHI VIDEO ENGINEERING, INC.TOKYO90

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujisawa, Kazuhiro Hyogo, JP 21 201
Inuzuka, Tatsuhiro Odawara, JP 27 380
Kinugawa, Kiyoshige Mutsuzawa, JP 49 713
Konuma, Satoshi Fujisawa, JP 15 173
Mano, Hiroyuki Tokyo, JP 93 728
Tsunekawa, Satoru Higashimurayama, JP 38 416

Cited Art Landscape

Patent Info (Count) # Cites Year
 
CANON KABUSHIKI KAISHA (1)
4,795,239 Method of driving a display panel 42 1986
 
CASIO COMPUTER CO., LTD. (1)
4,775,891 Image display using liquid crystal display panel 54 1985
 
KABUSHIKI KAISHA TOSHIBA (1)
4,748,510 Drive circuit for liquid crystal display device 29 1987
 
SEIKO EPSON CORPORATION (1)
4,743,096 Liquid crystal video display device having pulse-width modulated "ON" signal for gradation display 77 1987
 
STC PLC (1)
4,511,926 Scanning liquid crystal display cells 43 1983
 
TEKTRONIX, INC. (1)
4,857,906 Complex waveform multiplexer for liquid crystal displays 21 1987
 
YAMAHA CORPORATION (1)
4,779,083 Display control system 47 1986
 
Other [Check patent profile for assignment information] (1)
4,859,998 Apparatus and method for driving signal electrodes for liquid crystal display devices 19 1988

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
SEIKO EPSON CORPORATION (7)
6,337,677 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 13 1998
7,271,793 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 0 2001
7,855,710 Electro-optical device, circuit for driving electro-optical device, method of driving electro-optical device, and electronic apparatus 1 2005
7,940,244 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 0 2006
7,932,886 Liquid crystal display device, driving method for liquid crystal display devices, and inspection for liquid crystal display devices 1 2006
7,782,311 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 0 2007
8,704,747 Liquid crystal display device, driving method for liquid crystal display devices, and inspection method for liquid crystal display devices 0 2011
 
SHARP KABUSHIKI KAISHA (3)
5,541,619 Display apparatus and method of driving display panel 6 1993
5,977,944 Data signal output circuit for an image display device 13 1997
7,764,263 Display apparatus and driver circuit of display apparatus having precharged and written simultaneously without collision 0 2005
 
SEMICONDUCTOR ENERGY LABORATORY CO., LTD. (2)
6,731,264 Driver circuit for display device 29 2001
7,432,905 Driver circuit for display device 0 2004
 
GEC-MARCONI LIMITED (1)
5,241,392 Liquid crystal display 2 1991
 
MITSUBISHI ELECTRIC CORPORATION (1)
6,980,192 Liquid crystal display, integrated circuit for use therein, and driving method and driver of liquid crystal display 4 1999
 
PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. (1)
5,583,530 Liquid crystal display method and apparatus capable of making multi-level tone display 34 1993
 
THOMSON, S.A. (1)
5,103,112 Apparatus for generating control pulses of variable width, as for driving display devices 2 1990

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