Abstract
A readout circuit on glass substrate for touch panel application has been
designed and fabricated in a 3-$\mu{\hbox{m}}$ low temperature poly-silicon (LTPS) technology. In this work, the
switch-capacitor (SC) technique is applied to amplify the small voltage
difference from capacitance change due to the touch event on panel. In
addition, the corrected double-sampling (CDS) technique is also employed to
reduce the offset originated from LTPS process variation. The minimum
detectable voltage difference of the proposed circuit is 40 mV. To further
identify the different touch area during touch events, a 4-bit
analog-to-digital converter is used to converter the output of readout
circuit into 4-bit digital codes.
© 2010 IEEE
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