| 摘要 |
<p>PURPOSE:To improve the detection precision of input coordinates on a tablet by interposing a grounded conductive shield member between a liquid crystal display plate and the tablet. CONSTITUTION:A pressure-sensitive tablet 7 is provided above a liquid crystal display plate 6 and a conductive shield plate (conductive shield member) 14 is provided between the liquid crystal display plate 6 and pressure-sensitive tablet 7. A capacitor C1 is composed of an LCD transparent electrode 2a of the liquid crystal plate 6 and the conductive shield plate 14 and a capacitor C2 is composed of the conductive shield plate 14 and the resistance shield 9h of the pressure-sensitive tablet 7. Therefore, when an LCDCOM signal A as an AC rectangular wave is applied to a LCD transparent electrode 2b, a noise which is generated on the resistance sheet 9h of the pressure-sensitive tablet 7 before flows to the GND through the conductive shield plate 14, so the conventional noise is not generated on the pressure-sensitive tablet 7.</p> |
