Computer graphics processing and selective visual display system – Display driving control circuitry – Light detection means
Reexamination Certificate
2004-03-26
2009-10-13
Eisen, Alexander (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Light detection means
C345S076000, C345S081000, C345S082000, C345S080000, C345S084000, C345S092000, C315S169100, C315S169300
Reexamination Certificate
active
07602387
ABSTRACT:
In an active matrix electroluminescent display device a storage capacitor (24) is provided in each pixel for storing a voltage to be used for addressing a drive transistor (22) which controls the illumination of the electroluminescent display element (20). A discharge photosensitive element (34) is provided for discharging the charge storage capacitor in dependence on the display element's light output. A further photosensitive element (40) is provided so as to cancel photocurrents produced in the discharge photosensitive element (34) as a result of light input to the discharge photosensitive element other than from the pixel's display element (20), the further photosensitive element being shielded (44) from light emitted by the display element while being exposed to light from other directions. Irregularities in the display output due to the effects of the unwanted light inputs to the discharge photosensitive elements are then avoided.
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Eisen Alexander
Koninklijke Philips Electronics , N.V.
McCommas Stuart
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