Patent ID: 7505203

Claim:
A three-dimensional display device comprising: an image display unit having first pixels corresponding to left-eye images and second pixels corresponding to right-eye images, the first and second pixels defining an image formation plane for substantially forming the images; and a parallax barrier disposed in front of the image display unit, the parallax barrier having light interception portions and light transmission portions alternately and repeatedly arranged in a horizontal direction of the image display unit to separate left-eye image light beams from the first pixels and right-eye image light beams from the second pixels in directions of left and right eyes of a viewer, thereby defining an image separation plane for substantially separating the light beams; wherein when refraction index of all media placed on a route of the light beams from the image formation plane is substantially equal to 1, the image display unit and the parallax barrier substantially satisfy the following condition: B = a ⁢ ⁢ R ′ ⁢ L ′ R ′ + r , and ⁢ ⁢ R ′ = r ⁢ ⁢ E L ′ ⁡ ( 2 ⁢ ⁢ n + 1 ) where B is a pitch of the light transmission portions in the horizontal direction of the image display unit, a is a multi-view constant, R′ is a visual range measured from the image separation plane to a position of the left and right eyes of the viewer, L′ is an inter-center distance between the first and second pixels in the horizontal direction of the image display unit, r is a distance between the image formation plane and the image separation plane, E is a distance between the left and right eyes, and n is a positive integer.