The Spatial Three-dimensional Display System Based On The Light-emitting Properties Of LED

Spatial three-dimensional (3D) display technology, as a promising trend of the 3D display technology, is mostly corresponding to the human's habits of observing the world. Resent years, various types of spatial 3D display systems have developed rapidly, but rarely for the large display space and high resolution ones. Considering this situation, we investigate the spatial 3D display system based on the light-emitting properties of LED.In this paper, the theory of the light field rendering of the spatial 3D display system was raised, as well as the method of how to render the light field. The relationship between the data bandwidth and the light field rendering of the 3D display space was analyzed. The theory of the volumetric 3D display system based on a rotation planar LED screen and the omnidirectional multiview 3D display system based on a cylindrical LED screen were discussed respectively. The formulas that describe the light field rendering were deduced. The data bandwidth and the display characteristics were also analyzed.Large data transmission in the rotation system was achieved by using rotatable fiber optic joint. The real-time voxelization and quasi-real-time update were achieved by expanding the bandwidth with PCI-E bus. The fast spatial addressing circuit based on the two grades of FPGA for large data was achieved by using the modular screen. The 3D image was controlled by the time signal provided by the optocupler. The data organization methods of the two types of spatial 3D display systems were presented respectively.The evaluation parameters of the luminance uniformity and color uniformity were raised. There always exists a black line zone in the middle of the volumetric 3D display system for a rotation LED screen. We deduced the formula with the critical angles of how to describe the boundaries of the black line zone. The luminance uniformity and color uniformity of the volumetric 3D display system and omnidirectional multiview 3D display system based on the LED screen were studied. According to the analysis, the black line zone was the main reason for the luminance and color non-unoformily of the volumetric 3D display system based on the rotation LED screen. The luminance and color uniformity of the omnidirectional multiview 3D display system based on a cylindrical LED screen were much better than the volumetric 3D display system based on the rotation LED screen. The reasons for the luminance and color uniformity difference between these two systems were analyzed in detail. Besides, we introduced the method of improving the luminance and color uniformity of the systems by reranging the LED pixels in the screen.