Research On The Method Of Large Field Of View Tabletop Light Field Display

Visual sense is the main way of cognizing the world for human,and in the process of observing the world,human visual system(HVS)always perceives the world in three-dimensional(3D)way,analyzes and cognizes the information of the 3D world naturally.As the most important display method at present,the traditional two-dimensional(2D)planar display technology has been unable to meet the current social demands for the display of 3D data and depth information.The light field display which accords with the human eye's cognition habit can reconstruct the scene of the real world and enhance the authenticity of the displayed content.At present,there exists urgent needs for 3D display in all fields of industry.The true 3D display technology can truly restore the information of the real scene,including depth,color and contrast,etc.,to show the viewer a 3D scene close to real scene.The restored 3D scene is in line with people's perception of the real world,and fully meets the demands of the physiological and psychological depth clues to obtain more complete 3D perception.The light field display with the characteristics of true three-dimensional,large size and true color is one of the most important technologies for the true 3D display,and it is the hot point of current researches.In light field display,there is an urgent problem that there exist a constraint among high resolution,field of view(FOV)and depth of field(DOF).Increasing the FOV will decrease the resolution,thus it is unable to meet the resolution demand of desktop light field display.Therefore,in order to solve the above problems,this paper studies the key technologies that can increase the viewing angle of light field display while ensuring a high resolution.The main research contents and innovations are listed as follows:(1)Large FOV desktop light field display based on piece-wise trackingResearch Point 1:In integral imaging display(?D),the increase of the viewing angle usually comes at the cost of reducing the spatial resolution of the reconstructed 3D light field or decreasing the displayed DOF.And limited by the optical lens aberration,with the increase of viewing angle,the image quality of the usual IID decreases rapidly.In view of the above two situations,this paper presents a new integral imaging light field display structure.By designing a compound lens with aberration correction instead of a single lens,an improved imaging quality in a large viewing angle range is achieved.By introducing a holographic function screen with directional diffusion,the spatial light is multiplexed and the spatial resolution of IID is improved.Research Point 2:To solve the problem of depth flipping during the acquisition and reproduction of the integral imaging,the usual way is to perform acquisitions twice.This problem can be quickly solved by light field coding of parallax images.In order to ensure the resolution of the IID,the parallax image sequence usually needs to have a high resolution.The task of image rendering for the multi-view(such as 83 x 83 in our display)light field display device is heavy and takes a long time.In view of this phenomenon,a directly light field elemental image rendering method is proposed based on reverse ray tracing.Research Point 3:A large FOV light field display strategy based on piece-wise tracking is proposed,which can efficiently track viewers within a certain range without reducing the spatial resolution and depth of field of the display system,thus a 3D visual experience with large FOV is achieved.(2)Large FOV light field display system based on orthogonal polarization modulationResearch Point 4:In IIDs,the elemental images usually exit through their corresponding and adjacent lens,forming a repeating viewing zone in space.In this article,the principle of orthogonal polarization modulation is introduced to achieve the goal of projecting different elemental images to two adjacent lens cells.And by loading the elemental images of two consecutive views,which can achieve the purpose of displaying continuous 3D content in two adjacent view zones,the viewing zone is improved twice,thus the visual experience of the light field display is improved.Based on this theory,an LCD-based dynamic polarization light field display is implemented with improved viewing angle in this paper.Also a projection-based orthogonal polarization light field display with improved viewing angle is designed.