| 摘要 |
<p>PURPOSE:To obtain ferroelectric liquid crystal which makes an excellent display with high contrast by charging a liquid crystal composite body of the ferroelectric liquid crystal and dichroic dye between a couple of transparent substrates and arranging a polarizing plate which has an axis of polarization outside each substrate. CONSTITUTION:When a backward electric field E' is applied to the liquid crystal 24, liquid crystal molecules 25 and dye molecules 26 change in the direction of long molecule axes to a direction O' symmetrical about a screw axis P. In this case, light from a light source 16 which is polarized linearly by the 1st polarizing plate 33 enters the liquid crystal 24 in a direction different from the direction O' of the long molecule axes. Consequently, the incident light is hardly absorbed by the dye molecules 26 and exits after passing through the 2nd polarizing plate 34 to illuminate a photosensitive drum while a shutter part (a) is 'open'. Thus, the quantity of transmitted light in the 'closed' state of the shutter part (a) decreases greatly, so the ratio of the quantity to the 'open' state of the shutter part (a), i.e. sufficiently high contrast is obtained.</p> |
