SWITCHABLE REFLECTIVE DISPLAYS FORMED FROM HOLOGRAPHIC POLYMER -DISPERSED LIQUID CRYSTALS (HPDLC)

6,7,8 . Here we describe switchable HPDLC Bragg gratings which are holographically recorded in a simple single-step process. The HPDLC Bragg grating is a switchable grating which can be controlled by an electric field. For the practically switchable volume gratings, DE is a very important parameter. Selection of a proper monomer and control of the LC content, exposure intensity and time, and exposure temperature are typically used to control the resulting morphology (domain size, domain shape, volume fraction) which in turn effects DE. In this paper we explored the effects of these factors on DE and found the best reactive conditions by differential photo scanning calorimeter (DPC). Presently, the highest DE is 90.0%.