| 摘要 |
A scanning control device for a capacitive touch panel uses voltage driving/current detecting circuits to connect to a top conductive layer of the touch panel. Output terminals of all voltage driving/current detecting units are connected to a signal processing unit through a switching unit. Output data of the signal processing unit are output to a central control unit. If the touch panel is pressed, all voltage driving/current detecting circuits detect current values at four corners of the top conductive layer and sequentially output the current values to the signal processing unit. The processed data output from the signal processing unit are transmitted to the central control unit. Based on the received data, the central control unit calculates coordinate of a pressed point on the touch panel.
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