Computer graphics processing and selective visual display system – Plural physical display element control system – Segmented display elements
Reexamination Certificate
2007-08-10
2010-02-02
Vo, Tuyet (Department: 2821)
Computer graphics processing and selective visual display system
Plural physical display element control system
Segmented display elements
C345S082000, C345S106000, C345S101000, C345S212000, C315S309000, C315S307000, C315S247000, C315S312000
Reexamination Certificate
active
07656366
ABSTRACT:
The present invention provides a method and apparatus for controlling the thermal gradient and therefore the thermal stress in light-emitting elements in which the light-emitting elements are exposed to temperature gradients caused by varying drive current under operating conditions. The method and apparatus according to the present invention can reduce the thermal stress in a light-emitting element by adaptively determining a drive current transient for a required change in the drive current from a first drive current state to a desired second drive current state, wherein the drive current transient is adaptively determined in order to substantially minimize the change in applied voltage over time, during the transition time period.
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Koninklijke Philips Electronics , N.V.
Vo Tuyet
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