| 摘要 |
An active touch panel voltage compensation circuit, which is to improve voltage distribution in the border of an electrode layer of a touch panel, comprises: a power supply unit provides an initial voltage to a plurality of voltage-applying points of the electrode layer. A differential amplifier unit sets a calibration level. The differential amplifier unit is coupled to a plurality of detection points to obtain a plurality of detected voltages, and compares the detected voltages with the calibration level to obtain a plurality of deviation values. A processing unit works out the compensation voltages for the voltage-applying points according to the deviation values, generates a plurality of gain-modulation signals according to the compensation voltages and sends the gain-modulation signals to the power supply unit. The power supply unit regulates the initial voltage to the plurality of compensation voltages so that the detected voltages can reach the calibration level.
|
