| 摘要 |
PURPOSE:To quickly display a beautiful diagram free from drop-out by executing +1/-1 of a memory plane by a pixel unit at the time of drawing/erasing of the diagram, and displaying the part of a pixel not being zero by a prescribed color. CONSTITUTION:The memory plane 1 which stores the frequency of the overlap ping of the diagram for every pixel and consists of plural bits is provided, and at the time of displaying/erasing of the diagram, and adder subtracter 4 executes +1 or -1 for the part of the pixel of the diagram in the memory plane 1. Then, the bit is read out of the memory plane 1 by the pixel unit, and the pixel not being zero is displayed by the prescribed color. Thus, the diagram can be displayed quickly as being overlapped by reducing memory capacity, or the beautiful diagram free from the drop-out can be displayed quickly by erasing an optional diagram. |
