Addressing Schemes for Liquid Crystal Displays

Summary

The addressing circuit has the task of imposing a given grey shade at a prescribed time onto an individual pixel without causing discernible crosstalk to other pixels. The addressing of the liquid crystal displays (LCDs) may be performed electronically, optically or by plasma columns, where each physical effect realizes a switch allowing it to feed in the grey shade information. Optical addressing involves the transfer of optical image information of a camera or on a display screen directly into an LCD. Waveforms and addressing circuitry are very similar for all nematic LCDs, the Passive Matrix addressed LCD and the guest‐host displays, whereas for bistable devices such as ferroelectric LCDs and chiral nematic LDCs, different waveforms and addressing circuits are mandatory.