| 摘要 |
PURPOSE:To eliminate the influence upon a noise and to obtain a high quality hard copy by providing a comparing means for comparing the 1st video dot signal stored in the 1st storage means and the 2nd video dot signal, both the which are displayed on the same screen. CONSTITUTION:The 1st doe data of one screen is stored in a dot memory 101 through a dot data input line 101. When the 2nd dot data of one screen is inputted, the 1st doe data of one screen stored in the memory 101 is read out, and compared with the 2nd one in a comparator circuit 102. When they are not equal, the address showing the dot position is stored in an address memory circuit 103. When the 3rd dot signals of one screen are inputted, the address which shows the position where unequal dots are stored in the circuit 103 is read out, and the 1st and 2nd data, which are not equal and stored in the memory 101, is re-written according to the 3rd dot data.
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