| 摘要 |
An optical apparatus includes an optical modulation means having a pair of electrodes, and a photoconductor layer and an optical modulation substance layer disposed between the electrodes, a signal light source for supplying light data carrying gradation data to the photoconductor layer, and a readout light illuminator for supplying readout light for reading out picture data to the optical modulation substance layer. The readout light illuminator is driven so as to supply readout light having a planar light intensity distribution providing a constant product of a gradation period and a readout light intensity at each readout site of the optical modulation substance, or so as to scan the photoconductor layer with the light data frame by frame in mutually different scanning directions in succeeding frames.
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