Patent ID: 8040370

Claim:
A stereoscopic image display apparatus comprising: a flat display device having approximately square pixels squarely arranged on a flat display plane, each of the pixels being formed of three sub-pixels with an approximately rectangular shape; and an optical plate which is disposed in front of the display device and has optical apertures which extend linearly in the same direction as a diagonal line of a rectangle obtained by connecting n (n =2, 3, . . .) pieces of the pixels in the same direction as a long axis of the sub-pixel, and is configured to control directions of light rays from the pixels, wherein the flat display plane of the flat display device is divided into groups by sub-pixel, each of the groups is configured to display an elemental image and corresponds to each of the optical apertures in the optical plate, and an average value of pitches of the elemental images is larger than m (m =1,2,3 . . .) times a length of a diagonal line of a rectangle obtained by connecting n pieces of the pixels in the same direction as a short axis of the sub-pixel and the pitch of the optical apertures in the optical plate is equal to the m times the length of the diagonal line of the rectangle obtained by connecting n pieces of the pixels laterally.