b are photographs in the case that the distance between the substrates is about 3 microns other conditions being the same as fig5 a and 5 b the length of each micro domain becomes short as compared with fig6 a and 6 b such a narrow distance between the substrates allows the liquid crystal helices to unwind and therefore the response speed becomes as fast as 10 microseconds when measured in the same condition as the case of 20 microns the size of the micro domains can be changed by adjusting the preparation condition for instance the dimensions of micro domains were measured in the case where rubbing treatment was performed on the orientation control film with a rolling device in the following conditions ______________________________________ case 1 case 2 case 3______________________________________number of rotation 1 5 1 5 1 0weight applied to the roll 1 5 1 0 1 0______________________________________ the figures are relative values calculated with reference to those of case 3 being 1 0 the dimensions of micro domains are 25 microns u00d7 450 microns in case 1 10 microns u00d7 200 microns and 8 microns u00d7 200 microns the micro domains were observed uniformly throughout the liquid crystal layer instead of the use of a composite liquid crystal having a wide transition temperature range particular liquid crystal materials have been found to expedite the formation of micro domains the.