Pen drive digitizer panel drive circuit

摘要

The circuit discloses a panel drive circuit of a simple pen digitizer. The driving circuit includes: first delay means for generating a first square wave repeated every 12 cycles by receiving a clock signal and delaying the clock signal by one cycle; Second delay means for generating a second square wave by outputting the output signal of the first delay means by one period; Decoding means for receiving the first and second square waves and decoding them; And selecting a panel driving signal of a stylus mode or a finger mode according to a mode selection signal by receiving an output signal of the first delay means, an inverted signal thereof, an output signal of the second delay means, an inverted signal thereof, and an output signal of the decoding means. Characterized in that the signal selection means for outputting. According to the present invention, the circuit can be simplified.