PURPOSE: Separation of stereoscopic image for reducing phosphor lag in a PDP(Plasma display panel) is provided to process video frames efficiently for stereoscopic display on the PDP including plural luminous elements. CONSTITUTION: The new plasma display panels are provided for stereoscopic displaying. When using shutter glasses that are controlled by a PDP, left and right image in short succession is displayed for stereoscopic displaying. However, the phosphor lag effect really disturbs and totally impedes the stereo vision. The frame period of a stereoscopic picture is divided to at least one left period and at least one right period for the left picture and the right picture respectively. Both pictures are analyzed for similarities and the common part for a pair of corresponding pixels is determined. Sub-field code words for the left/right picture are determined with a part for specific left/right sub-fields(SLSF, SRSF) and a part for common sub-fields(CSF). The common sub-fields are positioned at the end of each left/right field for the left/right picture so that the phosphor lag effect is no longer visible.
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