REFLECTION MODE DISPLAY DEVICE

摘要

PURPOSE: To shorten switching time by setting up a difference in the length of an effective optical path between two states after reflection to almost a half of an incident optical beam with center wavelength, reflecting maximum light quantity by one of the two states and reflecting minimum light quantity by the other state. CONSTITUTION: A supporting plate 2 is provided with a transparent electrode 3 consisting of indium-tin oxide or other substances and an alignment layer 4 for preventing reaction between a liquid crystal substance 5 and an electrode. A Merk liquid crystal substance is arranged between the 1st supporting plate and a 2nd supporting plate constituted of a semiconductor substrate 6 and these supporting plates are separated from each other by a fixed distance. When off-voltage V1 capable of reflecting light of a certain quantity is selected in accordance with the phase rotation δ of polarized light, the generation of high voltage is prevented. When the thickness of the liquid crystal layer is suitably selected in accordance with the double refraction of a phase plate 39 and the phase shift δ, a difference in the length of a valid optical path between two states is set up to 1/2λ0 after reflection. Consequently switching time is furthermore reduced.