Abstract
This paper proposes a gate driver circuit for in-cell touch
thin-film transistor (TFT) liquid crystal displays (LCDs) in which
display and touch are driven at separate times to avoid cross-talk
between display signals and touch signals. In the conventional gate
driver circuit, transistors are connected between the gate node of
pull-up transistor
$Q$
node and the low DC supply voltage
$V _{GL}$
to reset the
$Q$
node. In the proposed gate driver gate driver circuit,
these transistors are instead connected to the Touch Enable signal.
During the display operation, the Touch Enable signal voltage is
$V _{GL}$
to operate the proposed gate driver circuit in the same way as the
conventional circuit. During touch operations, the Touch Enable signal
changes to the high DC supply voltage
$V _{GH}$
to keep the voltage
at the
$Q$
node constant without leakage. In simulations and experiments,
the proposed gate driver circuit prevented display failures caused
by the interval during which the display pauses in the middle of a
frame time for touch operation. The fabricated low temperature poly-silicon
(LTPS) TFT-LCD has good multi-touch functionality without any ghost
touches, and achieved 40-dB SNR and 120 Hz touch report rate.
© 2015 IEEE
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