Patent ID: 8749456

Claim:
A method for driving an organic light emitting diode (OLED) pixel comprising: receiving a first control signal corresponding to a first time duration; energizing said OLED pixel for a second time duration shorter than said first time duration; and setting said OLED pixel to black after said second time duration until an end of said first time duration, wherein said first control signal defines a first intensity level for said OLED pixel for said first time duration, and further comprising: transforming said first control signal into a drive signal having a second intensity level, said second intensity level being approximately equal to said first intensity level multiplied by said first time duration and divided by said second time duration, wherein said step of transforming comprises: providing a synchronization signal at a beginning of a cycle having said first time duration; providing a ramp signal beginning at substantially a same time as said synchronization signal; and providing a second control signal for modulating the ramp signal and having a third time duration, said third time duration being based on the first intensity level of said first control signal, said second control signal beginning at substantially said same time as said synchronization signal; wherein said drive signal comprises said ramp signal when said second control signal is high, and, when said second control signal is low, said drive signal is substantially constant at a value of said ramp signal at a transition of said second control signal front high to low, wherein said step of transforming further comprises setting the drive signal to substantially zero with another synchronization signal a after said second time duration, wherein: said first control signal associated with a first frame period, said first frame period being one of immediately consecutive flame periods, each frame period having a frame duration substantially identical to said first time duration; said synchronization signal is periodic and a first number of said synchronization signals occurs during any frame period, said first number being three or more; and said OLED pixel set to black in response to a second one of said synchronization signals, said second on of said synchronization signals following said first one of said synchronization signals by a second number of synchronization signals, said second number being less than said first number.