| 摘要 |
<p>PURPOSE:To measure an accurate input position even if a liquid crystal display device is driven with a high AC transformation signal by interrupting the AC converting signal supplied to the display device while a station is measured on a pressure-sensitive tablet, thereby eliminating the noise caused by the AC converting signal. CONSTITUTION:A liquid crystal display device 4 and a pressure-sensitive tablet 5 are integrated in a unit and an AC converting signal 27 is supplied between the electrodes of the device 4 so that the deterioration of the liquid crystal is prevented. When an input signal is supplied to an input device which performs an input operation to the tablet 5 with a pen 14, the signal 27 supplied to the device 4 is interrupted between the measurement start and end signals produced by a signal processor 16. That is, the signal 27 is interrupted while the pen point position is measured on the tablet 5. Therefore the pen point pointing position can be measured without being affected with noises.</p> |
