Abstract
The proposed sync-processor enables a fractional-order
time-synchronization to generate an efficient lens shutter-control timing
for the charge-shared LCD lens driving in the 3DTV active shutter glasses.
This design implements a universal sync-edge tracer as a pre-processor to
form the unit event of the wireless sync-packet, a fractional-order timer
to measure the timing period for accurate synchronization of the stereo-vision,
and charge-shared driver controlled by the proposed symmetric even/odd timer
to provide an efficient charge equalization method. The proposed symmetric
even/odd timer block sequentially generates the driver switching events by
distributing the driver activation into four pins of the LCD active shutter
lenses to reuse the pre-pumped charge of the charge-shared LCD driver, which
is sequentially shared between four pins for LCD lens. The proposed sequential
lens control by distributing the charge-sharing events also enables the reduction
of the hardware size required for the counters and overflow comparators in
the switching timer to generate the pulse width modulation (PWM) pulse waveform
of the LCD lens control for time-sequential 3D stereo-vision. The implemented
one-chip solution, which is applied with all of the proposed techniques to
improve the previous work, reduces about 140
$\mu{A}$
of LCD lens driving current,
which results in about 30% current reduction in total. This paper describes
the system's architecture and the details of the proposed techniques, while
also identifying the key concepts and functions.
© 2014 IEEE
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