| 摘要 |
<p>PURPOSE: A digitizer controller is provided which is adaptable to stylus, finger touch, touch panel mode respectively. CONSTITUTION: A digitizer controller includes a panel drive signal generator(10), a reference voltage generator(12), a first multiplexer(14) for selectively outputting either a panel drive signal or a reference voltage signal, a 4-channel driving portion(16) for generating a channel driving signal which is provided to each corner of a panel, a third multiplexer(26) for selectively outputting one of the finger touch signals and a stylus signal output from a stylus, a band pass filter, a rectifier(30) for rectifying the output of the band pass filter, a low pass filter(38) for detecting a substantial direct current component from the output of the rectifier(30), an analog-to-digital converter(44) for outputting the output of the low pass filter in synchronization with a panel driving control signal as a coordinates signal, and an interface(46). Therefore, the digitizer controller can be adopted to each of the stylus, finger touch and touch panel type digitizers, and in implementing a semiconductor integrated circuit, reliability is provided and power consumption is lowered.</p> |
