| 摘要 |
<p>PURPOSE:To prevent color mixture on a cursor overlapped part with simple constitution. CONSTITUTION:Picture element data from a frame-memory 1 and a mask-bit from a a mask-memory 2 are input to a mask circuit 3. When the mask bit is one, a null data is output from the mask circuit, and when it is zero, an input picture element data is output. In a D/A converter 4, an analog picture element signal corresponding to the value of the input picture element data is output. In an analog OR circuit 5, the analog picture element signal from the D/A converter 4 is addedd to the analog picture element signal from a main body device 6. When a cursor download command is received, a cursor pattern is held with a memory part 7 by a processing means 8 corresponding to the command. When a cursor moving command is received, the cursor pattern is developed in a territory of a mask memory corresponding to the moving destination of the cursor by a processing means 9 corresponding to the command.</p> |
