Three-dimensional (3D) projection display is an effective approach to realize large size 3D images with high resolution. An autostereoscopic 3D projection display is proposed. It consists of four projectors, a projection screen, a lenticular sheet and a parallax barrier. Operation principle and calculation equations are described in details and the parallax images are corrected by the means of homography. A 50-inch autostereoscopic 3D projection display prototype is developed and it presents good stereoscopic images. The normalized luminance distributions of the viewing zones are measured, and the results agree well with the designed values. Compared with the conventional autostereoscopic 3D projection display based on two parallax barriers, the proposed prototype has much higher brightness.
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