Diffraction Study

With the increasing and more complexion of information, there are increasing more demand for information display technique. Diffractive display can realize small size of display device, three-dimensional (3D) display, and large screen. In this paper, the diffractive display technique is studied, including the theoretical design, modeling simulation, system realization, system optimization, experimental discussion, characteristics analysis and special application.The key technique of the diffractive display-diffractive wave-front generating technique was studied and analyzed. Also we designed the micro-lenses array by diffractive wave-front generating technique, and used LCD display to enable the lens array to real-time control, which was used in Shack-Hartmann wave-front sensor.The data generating and reconstructing simulation platform of the diffraction display was developed. The design and analysis about amplitude type and phase type diffractive display of 2D and 3D images were processed in detail. Results show that the amplitude algorithm of diffractive pattern is short computing time when introducing the conjugate image. The phase algorithm is more efficient, but its algorithms is complicated.The relation between parameters of pixilated display device and the diffraction display was studied. Then demands on display devices in diffraction display were presented.We also applied diffraction display to the projection display. The resolution of too large pixel patch of the display devices was presented utilizing demagnified telescope system, and optical design for demagnified telescope system was completed. The relation between projection angle and projecting direction in diffraction display was researched at the point of view of the specialty of the diffraction projection display. The projection angle and projecting direction tilt angle could be controlled by algorithms. Moreover, error tolerance of diffraction projection display system was analyzed at the point of view of the system design, which shows that errors caused by display devices and system angle are more easily to be overcome in diffraction projection display than in other display systems, which is significant for practical applications.