Light modulation device, exposing device and display unit

摘要

A light modulation device incorporating: a semiconductor layer 3 formed on the upper surface of a lower transparent electrode 2 and made of an n-type semiconductor material; and an upper transparent electrode 5 formed on the upper surface of the semiconductor layer 3 through an insulating layer 4, wherein an electric field is applied vertically such that the upper transparent electrode 5 is negative and the lower transparent electrode 2 is positive to deplete carriers of the n-type semiconductor layer 3 so as to change at least either one of reflectance of light or adsorbance of light.