Patent ID: 7532225

Claim:
A three-dimensional image display device comprising: a display unit including pixels arranged in a form of a matrix, the pixels forming pixel groups configured to display element images; a mask including windows corresponding to the pixel groups, wherein: relative positions of the pixel groups to the windows change cyclically; vertically adjacent pixel lines or vertically adjacent regions each including a plurality of pixel lines are provided so that horizontal positions of the pixels relative to the windows are shifted by (h/a) times (in which a is an integer satisfying a relation 2≦a<6, and h is an integer satisfying a relation 0<h<(a−1)) as large as a horizontal pitch of the pixels; regions each including a plurality of horizontally adjacent pixel columns are provided so that horizontal positions of the pixels relative to the windows are shifted by (i/b) times (in which b is an integer satisfying a relation 2≦b<6, and i is an integer satisfying a relation 0<i<(b−1)) as large as the horizontal pitch of the pixels; and as a result of repetition executed while positions of the pixels relative to the windows are shifted by (h/a) vertically and by (i/b) horizontally, the same horizontal positions of the pixels relative to the windows appear cyclically every {(a/h)−1} pixels vertically and every {(i/b)−1} pixels horizontally.