Real Time Dynamic Holographic Display Based On Perovskite Doped Liquid Crystal

Holographic three-dimensional display can completely reconstruct both of the phase and amplitude information of object,which is considered as an ideal three-dimensional display technology.Holography has been widely studied since it was proposed.However,due to the limitation of holographic materials,most of the commercial holographic displays are still in static stage.In order to realize the dynamic holography with high diffraction efficiency and fast response speed,this thesis studies the real-time dynamic holographic display based on doped liquid crystal.The main contents are as follows:Photorefractive effect of liquid crystal doped with quantum dots（InP/ZnS） is studied.The dependences of diffraction efficiency on cell thickness,recording beam power,applied electric field and grating period are investigated.The highest diffraction efficiency can reach to 14%at about 15V/μm.The effects of electric field,grating period and other factors on the response speed are studied.Besides,the response time of liquid crystal doped with In P/Zn S is optimized.The total response time of 4.2 ms can be achieved under the condition of high recording power（100 mW） and high electric field（3 V/μm）,which can satisfy the refresh of high frame rate dynamic video.Photorefractive effect of liquid crystal doped with perovskite（CsPbBr₃） is investigated.Dependence of first-order diffraction efficiency of applied electric field,samples with different concentrations,power of recording power and grating period are studied.The maximum diffraction efficiency is 18% at the optimum electric field of 0.45 V/μm.Compared with liquid crystal doped with In P/Zn S quantum dots,the diffraction efficiency of liquid crystal doped with perovskite can be higher at a lower electric field.In addition,the effects of concentration,electric field,light intensity and other factors on the response time are discussed.The minimum rise time is 5.5 ms,which can satisfy the requirements of dynamic refresh frequency.Finally,we display 60 Hz refresh rate dynamic videos by a spatial light modulator.