| 摘要 |
PROBLEM TO BE SOLVED: To switch the screen display according to various display signal methods outputted from a computer device by providing a display signal switching circuit and a scaling circuit for correcting a selected output. SOLUTION: A first display signal 9 inputted from a connector 1 for connecting a signal of first display signal method is converted into a digital signal 11 in a first conversion circuit 3, and inputted to a two-input digital signal switching circuit 6. A second display signal 10 inputted from a connector 2 for connecting a signal of second display signal method is converted into a digital signal 12 in a second conversion circuit 4 and inputted to the switching circuit 6. An input changeover switch 5 is connected to the switching circuit 6 to selectively output the digital signal 13 of the signal 11 or the signal 12. The signal 13 is displayed on a display means 8 through a scaling circuit 7. The scaling circuit 7 corrects the signal 13 to a timing according to the specification of a display screen.
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