Patent ID: 8810608

Claim:
A device, comprising: a memory configured to store a persistence bit for each of a plurality of pixels of a display device, the persistence bit having a first value when a corresponding pixel should be illuminated for displaying a persistent image, and having a second value when the corresponding pixel should not be illuminated for the persistent image; a pseudorandom pixel value generator configured to receive a seed value for each video frame of the display device and in response thereto to generate pseudorandom pixel values for the plurality of pixels during each video frame, each pseudorandom pixel value being not greater than a specified variable persistence value corresponding to a desired persistence time for the persistent image, wherein each pixel of the display device, which has a pseudorandom pixel value that matches or is equal to a frame value, is turned off for the persistent image that is being displayed; a frame value generator configured to output a frame value for each video frame of the display device, each frame value being not greater than the specified variable persistence value; and a match detector configured to compare the frame value to the pseudorandom pixel values for the plurality of pixels during each video frame, and for each pixel where the comparison indicates a match, to make the persistence bit for the corresponding pixel have the second value.