Touch panel system, stylus pen, and electronic device

摘要

A touch panel system (1) according to one aspect of the invention includes: a stylus pen (15) including a drive circuit (26) that generates a first driving voltage based on a first code sequence and a second driving voltage based on a second code sequence, and a sensor circuit (40) that drives a pen point (38) with a multiplexed voltage obtained by multiplexing the first driving voltage and the second driving voltage; and a touch panel controller (2) that detects a position of the stylus pen (15) touching a touch panel.

主权项

1. A touch panel system, comprising:
a stylus pen for touching a touch panel which has M first signal lines (M is plural), K second signal lines (K is plural) which intersect with the M first signal lines, and (M×K) electrostatic capacitances formed at respective intersections of the first signal lines and the second signal lines; and a touch panel controller that detects a position of the stylus pen, wherein the touch panel controller includes a driver that applies a voltage on the M first signal lines based on first signal line code sequences indicative of M code sequences among (M+2) code sequences having a length of N (N is plural) and supplies the two remaining code sequences to the stylus pen, and the stylus pen includes
a driving circuit which generates a first driving voltage based on a first code sequence indicating one of two remaining code sequences among the (M+2) code sequences having a length of N (N is plural) and a second driving voltage based on a second code sequence indicating another one of the two remaining code sequences, anda multiplexing circuit which drives a pen point of the stylus pen with a multiplexed voltage obtained by multiplexing the first driving voltage and the second driving voltage, and the multiplexing circuit has
a variable resistor one end of which is connected to a first terminal to which the first driving voltage is applied and whose resistance value changes based on information regarding the stylus pen,a fixed resistor one end of which is connected to a second terminal to which the second driving voltage is applied, andan output terminal which is connected to the other end of the fixed resistor and the other end of the variable resistor and which outputs the multiplexed voltage.