Patent ID: 8767094

Claim:
A measurement method adapted to measure an optimal viewing distance of a three-dimensional (3D) display, the 3D display being adapted to produce a plurality of viewing zones, the measurement method comprising: configuring at least a part of a display area of the 3D display to display an image of one of the viewing zones; detecting light radiation amounts of a first position in the at least a part of the display area of the 3D display with a light detector from different viewing angles; selecting a viewing angle with a local maximum light radiation amount in the viewing angles as a reference viewing angle, changing a distance between the light detector and the 3D display along the reference viewing angle, and detecting light radiation amounts of a plurality of second positions in the at least a part of the display area of the 3D display in different distances along the reference viewing angle, wherein the second positions are different from each other; and selecting a distance at which light radiation amounts of the second positions are most uniform as the optimal viewing distance.