Patent ID: 8531666

Claim:
A method for positioning a viewing center of a parallax barrier in relation to a reference point of a flat panel display screen, comprising: disposing a parallax barrier reference point and multiple alignment markers at predetermined places of the parallax barrier and the flat panel display screen; performing position measurement and alignment of the multiple alignment markers using the parallax barrier reference point such that a displacement of the parallax barrier and a displacement of the viewing center of the parallax barrier in relation to the reference point of the flat panel display screen remains below a predetermined threshold; and setting the viewing center of the parallax barrier at a specific position determined from the displacement of the parallax barrier and displacement of the viewing center of the parallax barrier in relation to the reference point of the flat panel display screen; wherein the multiple alignment markers comprise of first geometrical patterns with first cross lines and second geometrical patterns with second cross lines, where at least one side of the first geometrical patterns and at least one side of the second geometrical patterns are as wide as an opening of the parallax barrier, the first geometrical patterns and the second geometrical patterns are complementary to each other, the first geometrical patterns are on the parallax barrier, and the second geometrical patterns are on the flat panel display for performing the position measurement and alignment in relation to the reference point of the flat panel display screen.