Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1997-10-30
2002-01-08
Shalwala, Bipin (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S207000, C348S227100, C348S229100
Reexamination Certificate
active
06337675
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to displays and more particularly to a display having automatic brightness control which is particularly useful for a vehicle display.
Current vehicles are increasingly including high resolution, re-configurable displays, such as electroluminescent displays. One known difficulty in utilizing such displays in vehicles is that the display may be difficult to see during the day in bright sunlight. In order to compensate for the problem, the brightness of the display may be increased manually. However, if the brightness of the display is increased, it will be too bright at night and interfere with the vision of the driver.
SUMMARY OF THE INVENTION
The present invention provides a display system having automatic and manual brightness control. A brightness controller varies the brightness (“luminance”) of the display based upon the ambient light (“illuminance”), as sensed by an ambient light sensor. The brightness controller varies the luminance of the display between a minimum luminance at a minimum ambient light level (minimum illuminance) to a maximum luminance at a maximum ambient light level (maximum illuminance). The display displays the maximum luminance when the ambient light sensor senses ambient light greater than or equal to the maximum illuminance. The display displays the minimum luminance when the ambient light sensor senses less than or equal to the minimum illuminance.
Preferably, the display system includes a user input device. The user input device selectively alters the maximum illuminance at which the maximum luminance is displayed. Further, the user input device selectively varies the minimum luminance displayed by the display at the minimum illuminance.
REFERENCES:
patent: 5453939 (1995-09-01), Hoffman et al.
patent: 5554912 (1996-09-01), Thayer et al.
patent: 5583484 (1996-12-01), Asano
patent: 5666028 (1997-09-01), Bechtel et al.
patent: 3042586 (1982-06-01), None
patent: 4409777 (1995-09-01), None
patent: 58224821 (1983-12-01), None
Palalau Silviu
Toffolo Daniel
Haller Timothy J.
Nguyen Jimmy H.
Niro Scavone Haller & Niro
Shalwala Bipin
UT Automotive Dearborn, INC
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