Patent ID: 7535646

Claim:
A light-emitting pixellated flat-panel display device, comprising: a light emitting element on a first side of a transparent substrate or cover through which light is emitted; and a microlens array on a second side, opposite to the first side, of the transparent substrate or cover though which light is emitted; wherein the microlens array comprises individual hemispherical shaped microlenses having a mean diameter of less than 20 micrometers and a mean microlens height to diameter ratio of greater than 0.30, and has a microlens area fill factor greater than 0.8; and where the individual micro-lenses of the array are randomly distributed at the scale of a pixel in the display device, such that the diffraction pattern observed when illuminating the micro-lens array with a beam of light exhibits one or more distinct rings, rather than individual bright points.