On Color Holographic Display LCOS System

Most people gain the majority of their spatial information through vision, and approximately90%of the population benefit from3-D perception. Along with the strong development in materials, electronics and optics advances here is a demand to push the limits towards3D display. The holographic display is able to reconstruct the true representation of3D images, so it becomes the mainstream technology for true3D display. Color holographic imaging is unquestionably the most perfect imaging technology; ideally, the reconstructed images are almost indistinguishable from the original scene.In recent years, with the development of the spatial light modulator, liquid crystal on silicon, as a new kind of spatial light modulator, is marriage of semiconductor integrated circuit and liquid crystal display technology, which has merits such as programmable, high diffraction efficiency, high resolution and low power consumption. Therefore, liquid crystal on silicon display technology receives great attention. Although the classical optical holography have a history of more than60years, it is very hard that replaces the holographic film by SLM and still obtains good quality of3D image reconstruction, there are still many challenges in color holographic display based on LCOS.This thesis mainly focuses on the research for color holographic display by the way of the space division multiplexing which is built by liquid crystal on silicon. The main works done and the contributions of this thesis are outlined as follows:1. According to the scalar diffraction theory, the different wavelengths of RGB laser, results in the different size of the imaging area of the reproduced image when the color image is reconstructed. For this problem, compensating the original image size of the RGB component has been proposed to achieve the same size of the reconstructed image of RGB components.2. Further, in order to solve the problem of offset in the center of the imaging area will happen due to the difference of the imaging area size, utilizing the merit of CGH, we propose to load digital blazed grating to the hologram in order to achieve the reconstructed image offset, so register the reproduction images of RGB.3. Based on the adjustment of the image size and offset the position of the imaging center, the thesis harvested an available projector to build a LCOS-based space division multiplexing color holographic display system; verify the feasibility of the proposed method conceptually. Compared to the other two ways to achieve color holographic display, the non-time-division method adoption by this system is matching the response speed of now available liquid crystal device.