| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving device for a touch panel having high amplification efficiency even when the change amount of capacitance is small, that is, an excellent noise property and high touch sensitivity.SOLUTION: The driving device for the touch panel includes a plurality of pixels. Each pixel includes: a differential amplifier connected to a first capacitor storing a charge of the pixel, input with a change amount of the charge accompanying a change of the capacitance from two input terminals, and outputting an amplified voltage; an analog/digital conversion part receiving an output of the differential amplifier, and converting the output into a digital value; a reference voltage calibration part outputting a positive voltage and a negative voltage to the differential amplifier, and calibrating a reference voltage value; an error calibration part calibrating two outputs of the differential amplifier such that the two outputs become values inside a voltage input range of the analog/digital conversion part; and a control part feeding two output values of the differential amplifier exceeding the voltage input range of the analog/digital conversion part back to the error calibration part. |
