41.3: 5° SiOx Deposition Alignment: A Possible Solution for the Low Power LCDs Using Low‐Frequency Applied Voltage Waveforms

Abstract

AbstractBistable displays are known to have low power consumption, but they usually lack the ability to display video‐rate images. Operating active‐matrix liquid crystal displays(AMLCD) with ultra‐wide refresh‐rate range, down to ∼1 Hz, can lower the power consumption to be similar to bistable devices, and offer video rates as well. 5° 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 5° SiOx‐based LC alignment is compared with those with polyimide‐based LC alignment. It is found that 5° SiOx alignment provides high VHR and small RDC, with good stability over time. Also, the VHR properties for the cells with 30° SiOx alignment were studied, as well as the cells without any alignment layers. It is found that these two types of cell have lower VHR than 5° SiOx whose surface morphology may help to capture a large amount of ions. Therefore, we show 5° SiOx alignment is an excellent candidate for low power AMLCDs operated with ultra‐wide refresh rate range.