A Dynamic Three-Dimensional Display Technique Based on Liquid Crystal Spatial Light Modulator

摘要

A dynamic three-dimensional (3D) display method based on Liquid Crystal on Silicon (LCoS) spatial light modulator is r introduced in this paper. Sixty viewing-angles are set at regular intervals of six degrees along a complete circle in thehorizontal plane, and phase holograms of three-dimensional virtual object are calculated under these viewing-angles byuse of computational tomographic method as well as spatial coordinate transformation. Multi- kinoforms are calculatedfor each angle by adding proper pseudorandom phase in each object plane, which can avoid losing spectrum informationand be able to reduce the speckle noise of reconstructed image. These kinoforms are written to a 3D electro-holographicdisplay system based on LC-R2500 spatial light modulator (SLM) by a proper loading sequence. A 650 nm diode laserwith power of 150 mW is used in the system. A transparent screen is taken as a display media, which could showthree-dimensional images reconstructed from holograms loaded on LC-R2500. A pair of Fresnel lenses is used toimprove the viewing effect and three-dimensional images floating in space can be viewed by multiple observers.