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Although Twisted Nematic LCDs may be driven in a time
multiplexed fashion to increase the display information,
they are restricted in terms of reduced contrast and limited
viewing angle. To achieve more highly multiplexed displays,
super twist technology is applied.
Super Twisted Nematic LCDs have a twist that is greater
than 90° but less than 360°. Currently most STN displays
are made with a twist between 180° and 270°. The higher
twist angles cause steeper threshold curves which put the
on and off voltages closer together. The steeper thresholds
allow multiplex rates greater than 32 to be achieved.
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STN LCD Display Glass Panel