| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a technique for realizing a function as a tablet by detecting the pressure applied to a liquid crystal display element. SOLUTION: A detecting pulse generating circuit is activated by line- sequentially applying pulses to gate lines G1-GL. While the gate line Gj is activated, a transistor 402 is turned on by the positive pulse of a reset signal RS and a capacitor C1 and a liquid crystal C2 of a liquid crystal display cell Mij are discharged through a brain line Di. When the reset signal RS is turned into 'L', transistors 401 and 402 are respectively turned on and off and the capacitor C1 and liquid crystal C2 are charged by a power source Vdd. When the liquid crystal display cell Mij of j-th line is pressed, since the capacitance of the liquid crystal C2 is increased, it is charged with a charge amount more than the other liquid crystal display cell. Therefore, an output Vo based on a charging current Ir is increased as well and by appropriately setting a reference potential Vr, a discriminate signal Ei can be activated.</p> |
