IMPROVEMENTS IN OR RELATING TO THE ADDRESSING OF LIQUID CRYSTAL DISPLAYS

摘要

A liquid crystal device of the kind in which individually addressable regions are set- table to different optical states in response to drive waveforms is described. The waveforms are used to cause the material in different re- gions to remain set in its existing optical state or to change to another state in dependence upon data to be input to the device, and they are pulse-like in nature and of predetermined am- plitude and duration. The operating speed of the device in response to said waveform is im- proved by causing the profile of the waveforms to depart from the usual squared profile. In one example the waveforms are caused to have substantially triangular leading and/or trailing edges and the profile causing the material to re- main set in its existing optical state differs from that causing the material to change into another optical state.