Optical address type display device with uniformly functioning optical switching elements each provided for each pixel

摘要

A display device has an insulated basic substrate. A plurality of light waveguides are arranged on the basic substrate in parallel to each other. A plurality of signal wires is arranged in parallel and in a manner to be crossed with the light waveguides, respectively. A plurality of photoconductive layers three-dimensionally are laid between the light waveguides and the signal wires and directly connected with each light guiding portion of the light waveguides at respective crosspoints between the light waveguides and the signal electrodes. A plurality of pixel electrodes provided are to be connected with the photoconductive layers, respectively. An insulated opposed substrate located in opposition to the basic substrate with a display medium therebetween and having an opposed electrode on the surface opposed to the basic substrate. And the relation among an index of refraction n1 of the light guiding portion, an index of refraction n2 of the photoconductive layer, and an angle of incidence theta of light given from the light guiding portion to the photoconductive layer meeting the following expression of n1 sin theta