PHASE DETECTION AUTOFOCUS USING LIQUID CRYSTAL DEVICE

Abstract: disclosed is system with imaging unit(s) and processor(s), imaging unit(s) with image sensor of photo-sensitive cells; and light valve device having array of light valves. the processor(s) is configured to: control light valves to allow light to pass therethrough, while controlling remaining light valves in the array to stop allowing the light to pass therethrough, thereby casting shadows of remaining light valves on first part and second part in first set and second set of photo-sensitive cells, respectively; read out image signals from photo-sensitive cells; select pairs of photo-sensitive cells from first set and second set; for given pair, determine phase difference between image signals read out from photo-sensitive cells of first set and second set; and adjust focus distance of the imaging unit(s), based on phase differences.

Inventor(s): Mikko Strandborg, Mikko Ollila

CPC Classification: H04N23/672 (Focus control based on electronic image sensor signals)

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