Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1997-11-12
1999-06-08
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 55, 345 75, 345 77, 315167, 315169, G09G 322
Patent
active
059107928
ABSTRACT:
A method and apparatus to provide performance adjustments for FEDs during operation are provided. More specifically, the present invention provides two circuit embodiments for compensating for temperature induced brightness variations of the panel display. In a closed loop embodiment, a sample display circuit that is substantially similar to a FED being adjusted is used to generate a performance indicator signal which is compared against a reference signal to determine a difference signal. The difference signal is then used to adjust the operation performance of the FED as well as the sample display circuit. In an open loop embodiment, a current source generates a reference current across a sample resistor which is made from the same material as the resistor layer inside the FED's cathode. The voltage across the sample resistor is compared against a reference signal to determine a difference signal. The difference signal is then used to increase or decrease the brightness of the panel display, as needed, to compensate for temperature induced variations or other types of environment induced variations (e.g., humidity, aging, mild voltage drift that creates undesirable current drift, etc.) thereof.
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Hansen Ronald L.
Spindt Christopher J.
Candescent Technologies, Corp.
Hjerpe Richard A.
Tran Henry N.
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