| 摘要 |
<p>PURPOSE: To improve the pen input position detection accuracy by preventing an input/output device from being affected by noise. CONSTITUTION: Concerning an electromagnetic input means 1, according to a scanning signal 101 from an input interface part 12 and a sense clock signal 102 from a display control part 31, a voltage signal 103 induced from an adjacent pen 4 for coordinate instruction is amplified/filtered by the input interface part 12 and generated as coordinate data 104 on an electromagnetic input tablet 11 integrally mounting a liquid crystal panel. These coordinate data 104 are converted and generated as display data 105 by a data processing means 2. A liquid crystal display means 3 displays these display data 105 on a liquid crystal display panel 32 as coordinates corresponding to segment and common driving signals 107 and 108 generated by a display control part 31 while commanding the display. The pen 4 for coordinate instruction generates a pen oscillating signal by oscillating a current and inducing a magnetic field inside the pen. In the case of this electromagnetic conversion, a position coordinate is indicated on the electromagnetic input tablet 11.</p> |
