| 摘要 |
PURPOSE:To display display contents which are different partially on different display devices at the same time by providing a means which inhibits a desired part of an electric signal to be supplied to a specific display device among display devices from being sent. CONSTITUTION:A signal supplied from a display control part 11 to CRT display devices 20 and 21 is branched by a branching circuit part 12 into two, and desired parts of the signals are masked by mask control circuit parts 13 and 14 when necessary and displayed on the CRT display devices 20 and 21. When a normal mask signal is absent, the signals are all displayed, but a part of the display is erased by making an optional part. For the purpose, the optional display part on an optional display is masked to erase the part which should not be displayed on each display. |
