US Patent No: 5,081,451

Number of patents in Portfolio can not be more than 2000

Display system for use in vehicle

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Importance

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Abstract

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A display system for a vehicle is provided with a fluorescent display tube. An anode control circuit outputs a control signal for selecting one or more of anode electrodes of the display tube to output a first control signal in response to which the selected anode electrodes are supplied with a positive voltage to cause the flourescent display tube to make a display. A display condition judging circuit judges whether or not the anode control circuit is outputting the first control signal. A brightness judging circuit judges whether the surroundings of the fluorescent display tube are bright or dark. A filament control circuit outputs a second control signal for energizing a filament of the display tube when said display condition judging circuit judges that the anode control circuit is outputting the first control signal and/or when the brightness judging circuit judges that the surroundings of the display tube are bright. The filament control circuit ceases to output the second control signal when the anode control circuit does not output the first control signal and at the same time when the brightness judging circuit judges that the surroundings of the display tube are dark.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
DIESEL KIKI CO., LTD.TOKYO184

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Oshizawa, Hidekazu Cupertino, CA 34 799
Takekawa, Yoriyuki Higashimatsuyama, JP 8 89

Cited Art Landscape

Patent Info (Count) # Cites Year
 
ARMSTRONG WORLD INDUSTRIES, INC. (1)
4,697,122 Slow acting photo lamp control 26 1986
 
Innovative Controls, Inc. (1)
4,682,084 High intensity discharge lamp self-adjusting ballast system sensitive to the radiant energy or heat of the lamp 42 1985
 
NISSAN MOTOR CO., LTD. (1)
4,358,713 Brightness control device for light emitting display of electronic meter 22 1980
 
U.S. Philips Corporation (1)
4,868,459 Method of and circuit for brightness and temperature-dependent control of an LCD illuminator 27 1987

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
Dell USA, L.P. (1)
5,636,041 Technique for increasing the visibility of an LCD panel during warm-up thereof 7 1995
 
GENTEX CORPORATION (1)
5,883,605 Automatic electrochromic control of light level of vacuum fluorescent display 115 1996
 
SIEMENS VDO AUTOMOTIVE ELECTRONICS CORPORATION (1)
5,563,622 Vacuum fluorescent display tri-compatible dimming 9 1994