Optical System Optimization Design Of Floating Light-Field Display

Three-dimensional(3D)display technology can provide the accommodation stimuli with precise depth cues and the smooth motion parallax with the correct geometric occlusion,which has attracted considerable attention in recent years.The floating light-field display is combined both floating display and 3D light-field display,which can provide observers with a 3D light-field image floating in the air.The floating light-field display is considered the most promising 3D display technology.However,the traditional methods of implementing floating light-field display have the defects of narrow viewing angle,poor image quality,large crosstalk and short floating distance,which significantly limit the developments and applications of floating light-field display technology.The floating light-field display performance is determined by the floating light-field display optical system.Therefore,it is significant to optimize the floating light-field display optical system,to improve the display performance.The optimization goals are to achieve large viewing angle,enhanced image quality,low crosstalk and long floating distance.The main research contents and innovations of this dissertation are as follows:(1)The optimization optical system design of large viewing angle and low crosstalk 3D light-field display.The 3D light-field image is the object image of the floating light-field display,and its display performance is the basis of the floating light-field display performance.The traditional 3D light-field display has the problems of narrow viewing angle,large crosstalk and poor image quality.In order to solve these problems,based on the directional backlight 3D light-field display method,the optical reverse mapping crosstalk-aberration analysis model is proposed.The analysis model demonstrates that if the beam spot RMS diameter in the holographic functional screen is smaller than the defined elemental image unit size,the aberrations are suppressed adequate,and the system crosstalk is acceptable.According to the analysis model,the catadioptric integrated backlight,micro-prism array element,and symmetrical triplet-compound lens array are designed and optimized.Based on the optimized optical system,a 90-degree viewing angle with enhanced image quality 3D light-field display is realized.The overall crosstalk is less than 5%and the SSIM value is 0.9618.Thus,the display performance of the 3D light-field display is improved.(2)The optimization design of aberration-suppressed and high retroreflective efficiency etroreflector floating device.After the display performance of the 3D light-field display is improved,the optimization design of floating device is required to be researched.The traditional retroreflector floating device has the problems of severe aberration,low retroreflective efficiency and poor image quality of generated floating light field image.In order to solve these problems,the etroreflector floating device aberration analysis model,and the retroreflective efficiency analysis model are proposed.According to the proposed method,the aberration-suppressed catadioptric retroreflector floating device with large viewing angle,and high retroreflective efficiency is designed and optimized.Using the catadioptric retroreflector floating device,a 90-degree viewing angle,226.8mm floating distance,32.1958 PSNR value,and enhanced image quality floating light-field display is established and realized.Thus,the performance of floating light-field display is improved.(3)The optical color-separated correction co-design method of enhanced floating light-field display image qualityIn order to enhance the floating light-field image quality without increasing the complexity of the optical system,the optical color-separated correction co-design is proposed.Based on the proposed method,the optical system is optimized in the first step.Then,the floating light-field coded image is preprocessed by image nonlinear scaling and deconvolution according to the specific aberration distribution in the optical optimization step.Therefore,the enhanced floating light-field coded image is obtained and the residual aberrations is suppressed.Furthermore,with the optical color-separated correction co-design method,a 60-degree viewing angle,28.3050 PSNR value,0.9152 SSIM value,and enhanced image quality floating light-field image is achieved by using simple structure single lens array.