PURPOSE: To increase speed by impressing positive and negative electric fields on a liquid panel wherein a liquid crystal having a chiral smectic C phase or H phase is sandwiched between two sheets of glass plates having "NESA" electrodes on the inside and controlling the intensity of transmitted light.

CONSTITUTION: Light of a light source 220 is on-off controlled in a liquid crystal panel parts 211W218, and the transmitted light is formed an image on a photoreceptor by a condenser lens 221. The liquid crystal panels are sandwiched by polarizing plates 211 and consist of "NESA" electrodes 213 coated on glass plates 212 by vapor deposition, sputtering, dipping, etc. and further formed by photoetching, thin metallic films 214 of an optical mask, insulation films 215 and orientation control films 216 for liquid crystals. A chiral smectic liquid crystal 218 such as decyl oxybenzylidene p'-amino 2-metabutylcinnamate, hexyl oxybenzylidene p'-amino 2-chloropropyl cinnamate or the like is sandwiched by seals 217 and the liquid crystal panel.