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An analysis of the basic approaches to flat panel autostereoscopic 3D display is presented, together with a discussion of the application of Liquid Crystal Displays (LCDs) in this field. We show that of particular importance in the design of parallax barrier type displays is the diffractive performance of the barriers. A near field diffraction model is used to analyse the detailed illumination structure of the output and can be used to assess viewing freedom and cross talk considerations. A comparison between front and rear parallax barrier displays is given, and compared with experimental results. Recent

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A novel architecture to enable flat panel displays to be electrically reconfigured between a full resolution 2D mode and a half resolution, low cross talk, autostereoscopic 3D mode is described. A Polarisation Activated Microlens comprising a high precision passive birefringent lens array and a commodity switchable polariser element is added to existing LCD panels with a low cost premium. The architecture enables high optical efficiency in 2D and 3D modes and is suitable for transmissive, reflective and transflective LCD devices. The implementation of the component on a transmissive TFT‐LCD is described and measured performance presented.