US Patent No: 5,977,940

Number of patents in Portfolio can not be more than 2000

Liquid crystal display device

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Abstract

Each pixel of a liquid crystal display device comprises a switching device for selecting a data signal, a memory portion for storing the data signal selected by the switching device and outputting an analog signal corresponding to the data signal, and a circuit for supplying an AC voltage corresponding to the analog signal to the liquid crystal layer. The liquid crystal layer is driven with a data signal stored in the memory portion or with an AC voltage corresponding to an analog signal corresponding to the data signal. With the signal stored in the memory portion, an AC voltage whose effective value or average value is controlled is supplied to the liquid crystal layer. Thus, unless a picture on the display is changed, since it is not necessary to supply the data signal, the peripheral driving circuit can be stopped. Consequently, although a picture is displayed in gradation mode, the power consumption can be remarkably reduced.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
KABUSHIKI KAISHA TOSHIBATOKYO36337

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akiyama, Masahiko Tokyo, JP 58 1118
Hioki, Tsuyoshi Yokohama, JP 70 367
Itoh, Goh Tokyo, JP 105 921
Motai, Tomonobu Yokohama, JP 8 187
Okumura, Haruhiko Fujisawa, JP 111 1055

Cited Art

Patent Info (Count) # Cites Year
 
KABUSHIKI KAISHA TOSHIBA (2)
5,686,932 Compensative driving method type liquid crystal display device 33 1994
5,646,643 Liquid crystal display device 35 1994
 
APPLE INC. (1)
5,396,351 Polarizing fiber-optic faceplate of stacked adhered glass elements in a liquid crystal display 24 1991
 
HITACHI, LTD. (1)
5,091,722 Gray scale display 77 1988
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
5,206,633 Self calibrating brightness controls for digitally operated liquid crystal display system 47 1991
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
5,528,256 Power-saving circuit and method for driving liquid crystal display 50 1994
 
NORTEL NETWORKS LIMITED (1)
5,339,090 Spatial light modulators 86 1992
 
OPTRON INC., (1)
4,514,727 Automatic brightness control apparatus 56 1982
 
PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. (1)
5,430,460 Method and apparatus for driving liquid crystal display unit 22 1994
 
THOMSON CONSUMER ELECTRONICS S.A. (1)
5,600,345 Amplifier with pixel voltage compensation for a display 20 1995
 
U.S. Philips Corporation (1)
5,684,501 Active matrix display device and method of driving such 69 1995

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
SEMICONDUCTOR ENERGY LABORATORY CO., LTD. (23)
6,597,349 Semiconductor display device and method of driving the same 30 1998
7,301,520 Image display device and driver circuit therefor 5 2001
7,250,927 Portable information apparatus and method of driving the same 2 2001
7,224,339 Liquid crystal display device, method of driving the same, and method of driving a portable information device having the liquid crystal display device 4 2001
7,184,014 Liquid crystal display device 6 2001
8,339,339 Light emitting device, method of driving the same, and electronic device 0 2001
6,774,833 D/A conversion circuit and semiconductor device 7 2001
7,602,385 Display device and display system using the same 3 2002
7,233,033 Semiconductor device having pixels 1 2004
7,227,542 Liquid crystal display device and method of driving the same 2 2004
7,268,777 Electrooptical device and method of fabricating the same 7 2004
7,411,535 D/A conversion circuit and semiconductor device 2 2004
7,532,208 Electrooptical device and method of fabricating the same 1 2004
7,489,291 Electrooptical device and method of fabricating the same 5 2004
7,518,592 Liquid crystal display device 0 2007
7,995,015 Display device 0 2007
7,791,610 Display device and display system using the same 0 2007
8,018,412 Display device 0 2007
8,004,483 Display device 0 2007
7,750,833 D/A conversion circuit and semiconductor device 0 2008
8,044,905 TFT arrangement for display device 0 2008
8,089,385 D/A conversion circuit and semiconductor device 0 2010
8,362,994 Display device 0 2011
 
SANYO ELECTRIC CO., LTD. (21)
7,019,726 Power consumption of display apparatus during still image display mode 3 2000
7,095,389 Active matrix display device 1 2001
7,081,875 Display device and its driving method 2 2001
7,019,727 Display device 1 2001
7,019,738 Display device and its control method 2 2001
6,853,371 Display device 5 2001
6,825,834 Active matrix display device 3 2001
6,671,023 Active matrix display device 0 2001
7,173,589 Display device 4 2002
7,123,233 Display device 1 2002
7,038,650 Display device 1 2002
7,027,026 Display device 2 2002
6,885,359 Display device with selective rewriting function 1 2002
6,873,321 Display device with two-level image representation 2 2002
6,950,080 Display device 3 2002
6,803,896 Display device 3 2002
6,956,553 Active matrix display device 6 2002
7,432,898 Active matrix display device 0 2005
7,518,571 Display device 0 2005
7,583,259 Power consumption of display apparatus during still image display mode 0 2006
7,808,495 Display device and its control method 1 2006
 
CITIZEN FINETECH MIYOTA CO., LTD. (6)
6,525,709 Miniature display apparatus and method 22 1997
6,690,499 Multi-state light modulator with non-zero response time and linear gray scale 1 2000
7,283,105 Microdisplay and interface on single chip 14 2004
7,755,570 Microdisplay and interface on a single chip 1 2007
8,059,142 Digital display 0 2008
7,932,875 Microdisplay and interface on a single chip 1 2010
 
SYNDIANT, INC. (6)
8,189,015 Allocating memory on a spatial light modulator 0 2006
8,089,431 Instructions controlling light modulating elements 0 2006
8,035,627 Bit serial control of light modulating elements 0 2006
8,004,505 Variable storage of bits on a backplane 0 2006
8,120,597 Mapping pixel values 1 2006
7,924,274 Masked write on an array of drive bits 0 2006
 
SEIKO EPSON CORPORATION (5)
6,636,194 Electrooptic device and electronic equipment 41 2000
6,873,310 Display device 26 2001
7,187,355 Display device, method of driving a display device, electronic apparatus 4 2001
6,940,482 Electrooptic device and electronic apparatus 7 2002
7,167,152 Optoelectronic-device substrate, method for driving same, digitally-driven liquid-crystal-display, electronic apparatus, and projector 0 2003
 
SONY CORPORATION (5)
6,181,314 Liquid crystal display device 32 1998
6,313,819 Liquid crystal display device 42 1998
6,333,737 Liquid crystal display device having integrated operating means 33 1999
6,445,368 Display device having intergrated operating means 12 2000
7,825,885 Display device 3 2006
 
VENTURE LENDING & LEASING IV, INC. (5)
6,388,661 Monochrome and color digital display systems and methods 98 2000
6,756,976 Monochrome and color digital display systems and methods for implementing the same 4 2002
7,499,065 Asymmetrical switching delay compensation in display systems 8 2004
7,212,359 Color rendering of illumination light in display systems 3 2004
7,131,762 Color rendering of illumination light in display systems 6 2004
 
INTEL CORPORATION (4)
6,642,915 Display panel 6 1999
7,170,485 Optical display device having a memory to enhance refresh operations 1 2000
6,731,306 Display panel 6 2001
7,760,214 Inserting transitions into a waveform that drives a display 0 2004
 
PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. (4)
6,894,671 Display apparatus including optical modulation element 5 2001
6,882,333 Display method and display apparatus therefor 0 2001
6,753,834 Display device and driving method thereof 20 2001
7,064,736 Liquid crystal display device 0 2004
 
SHARP KABUSHIKI KAISHA (4)
6,724,358 Active matrix type display apparatus and method for driving the same 7 2001
7,126,595 Image display device using a scanning and hold display mode for power saving purposes 8 2001
7,079,096 Image display device and display driving method 2 2002
8,159,442 Liquid crystal display device 0 2006
 
GOLD CHARM LIMITED (3)
6,590,553 Liquid crystal display device and method for driving the same 15 2000
7,362,304 Liquid crystal display device and method for driving the same 7 2003
7,564,443 Liquid crystal display device and method for driving the same 0 2008
 
WISTRON CORPORATION (3)
6,115,019 Register pixel for liquid crystal displays 19 1998
6,329,974 Electro-optical material-based display device having analog pixel drivers 21 1998
6,795,064 Electro-optical material-based grey scale generating method 17 2001
 
AVENPORE PROPERTIES LIMITED LIABILITY COMPANY (2)
7,209,108 Differential drive circuit and method for generating an a.c. differential drive signal 1 2001
7,880,710 Differential drive circuit and method for generating an a.c. differential drive signal 0 2007
 
Elantec Semiconductor, Inc. (2)
6,781,532 Simplified multi-output digital to analog converter (DAC) for a flat panel display 14 2002
6,927,712 Simplified multi-output digital to analog converter (DAC) for a flat panel display 4 2004
 
KABUSHIKI KAISHA TOSHIBA (2)
7,084,851 Display device having SRAM built in pixel 1 2001
6,958,744 Liquid crystal display device 1 2003
 
LG DISPLAY CO., LTD. (2)
7,015,903 Liquid crystal display device and driving method thereof 3 2001
8,378,734 Method and system for reduction of off-current in field effect transistors 0 2003
 
AVAGO TECHNOLOGIES ECBU IP (SINGAPORE) PTE. LTD. (1)
6,249,269 Analog pixel drive circuit for an electro-optical material-based display device 28 1998
 
AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD. (1)
6,441,829 Pixel driver that generates, in response to a digital input value, a pixel drive signal having a duty cycle that determines the apparent brightness of the pixel 47 1999
 
CANON KABUSHIKI KAISHA (1)
7,142,178 Driving device and image display apparatus 0 2003
 
CHIMEI INNOLUX CORPORATION (1)
7,633,472 Active matrix display devices 3 2003
 
CITIZEN HOLDINGS CO., LTD. (1)
6,804,029 Liquid crystal shutter 2 2001
 
DUKE UNIVERSITY (1)
7,460,101 Frame buffer pixel circuit for liquid crystal display 2 2005
 
FUJITSU LIMITED (1)
7,167,168 Display device and method for driving display device 1 2004
 
GE BETZ (1)
6,911,964 Frame buffer pixel circuit for liquid crystal display 25 2002
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
7,298,368 Display device having a DAC per pixel 1 2004
 
MANNING VENTURES, INC. (1)
7,317,437 Graphic controller for active matrix addressed bistable reflective Cholesteric displays 1 2004
 
MAXIM INTEGRATED PRODUCTS, INC. (1)
7,050,027 Single wire interface for LCD calibrator 6 2004
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
6,756,953 Liquid crystal display device implementing gray scale based on digital data as well as portable telephone and portable digital assistance device provided with the same 10 2000
 
MITSUBISHI ELECTRIC CORPORATION (1)
6,373,456 Liquid crystal display 5 1999
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
6,437,839 Liquid crystal on silicon (LCOS) display pixel with multiple storage capacitors 17 1999
 
NEMOPTIC (1)
7,864,148 Bistable nematic liquid crystal display device and method for controlling such a device 1 2003
 
OMNIVISION TECHNOLOGIES, INC. (1)
6,980,188 Display with multiplexed pixels 8 2000
 
RYO HOLDINGS, LLC (1)
6,091,391 Circuit for producing a contrast voltage signal for a liquid crystal display which uses a differential comparator, capacitors, transmission gates and feedback to reduce quiescent current 3 1998
 
SAMSUNG DISPLAY CO., LTD. (1)
7,095,391 Low power LCD 7 2001
 
TPO HONG KONG HOLDING LIMITED (1)
7,230,597 Active matrix array devices 3 2002