Patent attributes
Provided are a light guide element and an image display apparatus capable of suppressing the occurrence of multiple images. The light guide element includes a light guide plate and a first incidence diffraction element, a second incidence diffraction element, a first emission diffraction element, and a second emission diffraction element that are provided on the light guide plate, in which the first and second incidence diffraction elements diffract incident light in different directions to be incident into the light guide plate, the first emission diffraction element emits light that is diffracted by the first incidence diffraction element and propagates in the light guide plate, the second emission diffraction element emits light that is diffracted by the second incidence diffraction element and propagates in the light guide plate, a period of a diffraction structure of the first incidence diffraction element and a period of a diffraction structure of the second incidence diffraction element are different from each other, a period of a diffraction structure of the first emission diffraction element and a period of a diffraction structure of the second emission diffraction element are different from each other, the first and second emission diffraction elements are disposed at a position where the first and second emission diffraction elements overlap each other in a plane direction of a main surface of the light guide plate, and a periodic direction of the diffraction structure of the first emission diffraction element and a periodic direction of the diffraction structure of the second emission diffraction element intersect with each other.
