Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2003-12-10
2009-08-11
Awad, Amr (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S082000, C345S690000
Reexamination Certificate
active
07573445
ABSTRACT:
A light emitting element deteriorates with time. Therefore, a method for reducing a lighting time is suggested to obtain a long life light emitting element. However, when the proportion (duty ratio) that a lighting time occupies per one horizontal scan period is reduced, the apparent luminance is also lowered. According to the invention, a light emitting element is controlled so that a light emitting period205and a non-light emitting period206are switched alternately at least once during a sustain period203in synchronism with a control signal. Thus, instantaneous lighting time can be reduced enough to reduce the duty ratio while maintaining the apparent luminance.
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Awad Amr
Cook Alex Ltd.
Semiconductor Energy Laboratory Co,. Ltd.
Sherman Stephen G.
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