| 摘要 |
PROBLEM TO BE SOLVED: To reduce a false outline in a moving picture at the time of driving a display device having a binary memory effect like a DC plasma display panel by a subfield method in a DC mode memory system. SOLUTION: When the display device having a binary memory effect which drives optical elements arranged like a matrix in the DC mode memory system is used to display a half-tone, the gradation of brightness is converted into the length of plural bits, and the light emittion time is determined by combination of plural encoded bits, and a signal of every field corresponding to the number of these bits is successively read out so that subfield are approximately consecutive, and optical elements are caused to emit light only for a time determined for every bit. In this subfield method, a maximum light emission time is set to <=1/20 field time, and the MSB(most significant bit) subfield is divided into two approximately, and subfields are so arranged that the other subfields are interposed between them, and they are read out in this arrangement order to emit light. |
