Patent ID: 8780188
Filing Date: 2014-07-15
Classification: G02B,H04N

Abstract:
1. A view forming module for arrangement over and in registration with an image forming means of an autostereoscopic display device, the image forming means having an orthogonal array of display pixels spatially defined by an opaque matrix, the view forming module providing at least two optical functions, a view forming function and a brightness non-uniformity reducing function, wherein the view forming function modifies the direction of outputs of the display pixels such that the outputs of groups of the display pixels are projected in respective different directions as a plurality of views, the view forming function being provided by an array of parallel view forming elements arranged across the view forming module and having a first pitch, and wherein the brightness non-uniformity reducing function spreads or diverges the outputs of the display pixels such that brightness non-uniformities that would otherwise be caused by imaging of the opaque matrix are reduced, the brightness non-uniformity reducing function defining a second pitch across the view forming module of zero or less than the first pitch, and the brightness non-uniformity reducing function further defining an effective spreading angle in a plane perpendicular to axes of the view forming elements, the effective spreading angle being no greater than 1.5 times the angle that would exist between adjacent views projected by the view forming function in the absence of the brightness non-uniformity reducing function.