Light guide device

Abstract

A light guide device according to an embodiment of the present invention is a light guide device including a plate portion in which light is totally reflected, and a first diffraction portion and a second diffraction portion which are disposed on the plate portion, wherein the first diffraction portion diffracts the light incident into the plate portion toward the second diffraction portion, the second diffraction portion diffracts the light totally reflected in the plate portion to the outside, the first diffraction portion has a first length in a first direction and a second length in a second direction perpendicular to the first direction, the second diffraction portion has a third length in the first direction, and the first length is different from the third length.

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