| 摘要 |
<p>PURPOSE:To highly accurately and stably input coordinates based on correct reference voltage detection by providing a means, which sorts the contact state of a resistor sheet into plural levels and detects them, and executing a coordinate detecting processing only when the specific contact state is detected. CONSTITUTION:A comparator circuit consists of comparators A and B which input voltages Va and Vb (Vb > Va) obtained by dividing a voltage Vi by means of a resistance as a reference voltage. The comparing processing by means of the comparator circuit is executed by turning on a transistor (TR) switch TXH and turning off TR switches TXL, TYH and TYL so as to apply a current from an (x) resistor 2 side to a (y) resistor 3 side and an input resistance Ri. That is, the output voltage of the resistor is compared with the two basic voltages, the contact state of the (x) and (y) resistors are detected by sorting it to non-contact, incomplete contact and complete contact levels, and only at the time of the non-contact state, the reference voltage for input detection is inputted. Thus, the coordinates can be accurately and stably inputted.</p> |
