| 摘要 |
PURPOSE:To reduce the number of switches of relays and the like by mutually shorting respective scan lines in X and Y directions, which have been selected by means of operating the switch among a switch group. CONSTITUTION:For shorting a scan line X0 in the X direction and a scan line Y0 in the Y direction, for example, a pseudo matrix switch MG turns on respective switches 100 and 110, both of which are installed in accordance with respective scan lines. When the number (n) of the scan lines in the X direction in a matrix switch M is set to '4', the number (m) of the scan lines in the Y direction to '4', and the maximum number of ON-times to '1', only 4+4=8-number of switches (relays and the like) are needed in the pseudo matrix switch MG. Thus, the number of the switches can be reduced to half compared to a conventional circuit. |
