Our system is based on the combination of Fourier Optics and a cooled CCD sensor head. > The first lens provides a Fourier transform image of the display surface. Every light beam emitted from the test area with a q incident angle will be focused on the focal plane at the same azimuth and at a position x=F(q). The angular characteristics of the sample are thus measured simply and quickly, without any mechanical movement.

> The Optical Relay System scales the Fourier transform image of the measured surface (The measuring spot can be easily trimmed by means of a carefully placed aperture) on the CCD sensor.

> The captured image is used in order to obtain, after a suitable computation, the viewing angle map of the measured display (representation of the dependence of the display luminance with angle)