| 摘要 |
Low-cost devices for touch control by using a matrix of discrete composite switch contacts in close proximity, and x and y terminal measurable parameter such as resistance for touch position sensing and encoding. When a touch position is touched, the corresponding composite switch contacts simultaneously short a proportional portion of the x and y terminal resistance. These terminal resistance values are then converted to digital x and y cordinates of the touched position by A/D converters. Also, that the resistance between the last position sensing conductor and the ground return is three to five times larger than the resistance between all the other position sensing conductors of the first and second sheet eliminates the occasional error of detecting the normally untouched state as a touched state.
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