| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve coordinates deviation by fluctuation of voltage lowering of a driving element by data converting up and down, left and right electrodes voltages of a touch panel immediately after the touch panel is pressed by a pen and transforming X coordinate and Y coordinate obtained afterward by using this value into genuine Y coordinate and X coordinate. SOLUTION: A value of a potential A/D converter of each corrector of a transistor Qu, a transister Qd, a transistor Qr and a transistor Ql is made Cu, Cd, Cr and Cl. A value obtained here is the value which AD converts a resistor ratio Ru:Rd of a touch panel electrode. Immediately after pen down, the Cu and the Cd are obtained and, by using these values, a saturation voltage of the transistor is corrected by using an equation Rd/(Ru+Rd)=(Cr-Cd)/(Cd-Cd). Measurement of Y coordinate has been explained but, in the case of X coordinate, a similarly correct X coordinate is obtained by using an equation Rd/(Ru+ Rd)=(Cu-Cl)/(Cr-Cl).</p> |
