Patent ID: 8220939

Claim:
A screen device comprising: a light collecting element array including a plurality of light collecting elements that collect incident light; and a back surface sheet which includes: a first electrode plate on which the incident light is incident, a second electrode plate, a photoconductive layer disposed between the first electrode plate and the second electrode plate and having impedance characteristics that change according to the light intensity of the incident light, and an image recording layer disposed between the first electrode plate and the photoconductive layer and having a layer state that changes based on a voltage applied to the first and second electrode plates and also based on the impedance characteristics of the photoconductive layer, and that maintains the layer state even after the application of the voltage is stopped, wherein the image recording layer includes a light reflecting portion being formed at a light collecting region to which the light collected by the light collecting elements is irradiated, and a light absorbing portion being formed at a non-light collecting region to which the light collected by the light collecting elements is not irradiated.