Optical device

An optical device disposed on a display surface side of a display device having pixels arranged in a matrix, each pixel having sub-pixels arranged in a first axis direction, the optical device comprising:

• a light blocking barrier disposed on the display surface, the light blocking barrier including M×N apertures for each of the pixels (M is a multiple of the number of the sub-pixels in one pixel and N is an integer), where the M apertures are formed in the first axis direction and the N apertures are formed in a second axis direction perpendicular to the first axis direction;
• a first lens disposed on the side, of the light blocking barrier, opposite to the display surface, the first lens including one or more first lens parts arranged in a stripe pattern within a width of each pixel in the second axis direction, the first lens parts each extending across a region of two or more of the pixels in the first axis direction and having refractive power in the second axis direction;
• and
• a second lens disposed on the side, of the first lens, opposite to the light blocking barrier or between the light blocking barrier and the first lens, the second lens including second lens parts arranged in a stripe pattern within the width of each pixel in the first axis direction at a pitch obtained by dividing a pitch of the first lens part in the second axis direction by the number of the sub-pixels, the second lens parts each extending across a region of two or more of the pixels in the second axis direction and having refractive power in the first axis direction,
• wherein, in a region within a shorter one of first and second preferred viewing distances where the first preferred viewing distance denotes a preferred viewing distance of the first lens and the second preferred viewing distance denotes a preferred viewing distance of the second lens, an aperture size of the apertures is set so that each of projection regions projected into a space through the apertures, the first lens and the second lens is smaller than a region determined by the size of a pupil, and a first interval between the projection regions adjacent to each other in the first axis direction and a second interval between the projection regions adjacent to each other in the second axis direction are smaller than a diameter of the pupil.