高亮度低色差裸眼三维显示中的谐衍射结构设计  

Design of harmonic diffraction structure in glasses-free three-dimensional display with high brightness and low chromatic

作　　者：吕富国 霍富荣[1,2] 薛常喜[1,2] LYU Fuguo;HUO Furong;XUE Changxi(Key Laboratory of Advanced Optical Design and Manufacturing Technology of Jilin Province,Changchun University of Science and Technology,Changchun 130022,China;School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学先进光学设计与制造技术吉林省高校重点实验室,吉林长春130022 [2]长春理工大学光电工程学院,吉林长春130022

出　　处：《红外与激光工程》2024年第6期125-134,共10页Infrared and Laser Engineering

基　　金：吉林省自然科学基金项目(20220101124JC)。

摘　　要：目前,裸眼3D显示技术仍存在亮度低、清晰度差、结构复杂和制造难度高等缺点。为此,提出了一种可同时精确调制RGB像素光线的具有较大周期宽度的离散化谐衍射结构,四组交织排列的谐衍射结构子单元旋转对称分布组成调制三维光场的位相调制面板。使用Tracepro软件对水平方向上两个特定位置处的体像素进行了分光模拟实验。分析了不同台阶近似以及光源斜入射时的衍射效率与总光效的关系,得到16台阶近似时入射角应小于10°的结论。设计的谐衍射结构提升了显示亮度和清晰度,降低了设计与制造难度。得到了一种具有两个观看视角、分离角度为9.4°、最佳观看位置距离屏幕为384.2~402.8mm的裸眼3D显示方案。Objective Due to the inability of flat display technology to meet people's desire to perceive three-dimensional depth information,and the inability of bulky display devices in head mounted 3D display products to meet portability requirements,glasses-free 3D(three-dimensional)display technology has become a highly promising development direction.Although significant progress has been made in the development of glasses-free 3D displays based on cylindrical barriers or microlens arrays utilizing the principles of geometric optics.However,the inherent defects of geometric optics lead to issues such as reduced image brightness,poor fusion performance,and significant waste of pixel resources.In contrast,the glasses-free 3D display technology based on diffraction optics has largely solved these problems.At present,the implementation methods using diffraction gratings and traditional diffraction optical elements still exhibit drawbacks such as low brightness,significant color difference,and complex design and manufacturing processes.Therefore,in order to improve light efficiency and image clarity,and reduce design and manufacturing difficulties,a phase modulation panel has been designed.By aligning the array of harmonic diffraction subunits with the pixel level of the LCD panel,a good glasses-free 3D visual experience can be provided.Methods A phase modulation panel consisting of four interleaved arrays of harmonic diffraction subunits was designed.In TracePro software,nearly 10000 light rays were vertically incident on two individual pixels located in the horizontal direction of the phase modulation panel to verify the convergence effect of light rays(Fig.2),simplifying the complexity of designing and manufacturing harmonic diffraction structures.To meet the binocular parallax attribute,a display effect with a 32 mm horizontal interval for dual views and uniform distribution of four viewpoints has been achieved.At the same time,the effect of oblique incidence of light sources on the total luminous efficiency was studied

关 键 词：光学设计 裸眼3D显示 谐衍射光学元件 衍射效率 体像素 

分 类 号：O436.1[机械工程—光学工程]