Capacitance Touch Panel Theory Basis - Sharp PN-L803C Service Manual

2. CAPACITANCE TOUCH PANEL THEORY BASIS

2-1. Capacitance change basis
Typical sensor pattern
[Capacitance change outline]
2-2. Drive system (Sharp original: The multiple drive system)
・Multiple lines are driven at the same time.
[Image of the drive system]
Activates the multiple lines at the same time and reads the signal one
by one from mixed multiple lines by the arithmetic processing.
[Configuration]
Touch sensor
Read Q=Cf.V as the signal.
Sensor sheet
Touch controller
PN-L803C/80TC3 HARDWARE DESCRIPTIONS 8 - 5
Equivalence circuit
The capacity is changed with
coming near the touch panel.
Metal mesh wiring
Extract the touch position, size,
strength, etc, after reading the
capacity distribution.