Abstract
Abstract— Bistable displays are known to have low‐power consumption, but they usually lack the ability to display full‐color video‐rate images. Operating active‐matrix liquid‐crystal displays (AMLCDs) with an ultra‐wide refresh‐rate range, down to ∼1 Hz, can lower the power consumption to that of bistable devices and offer video rates as well. A SiOx‐layer‐based liquid‐crystal (LC) alignment technique is studied here to overcome the ion problems typically encountered with low‐refresh‐rate devices. The effect of ions on the voltage‐holding ratio (VHR) and residual DC voltage (RDC) with SiOx‐based LC alignment is compared with those for polyimide‐based LC alignment. It is found that only SiOx alignment provides high VHR and small RDC, with good stability over time. Therefore, it is shown that SiOx alignment is an excellent candidate for low‐power AMLCDs operated with an ultra‐wide refresh‐rate range.
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