消除自由立体显示串扰的定向背光源设计

定向背光柱透镜光栅式多视点自由立体显示器的串扰和亮度均匀性问题是影响其广泛应用的主要因素之一.本文通过分析串扰产生的原因,根据偏轴光线的成像光学原理,推导出液晶显示屏光开关板列单元与柱透镜组成的偏轴光学系统的参数计算式.提出一种液晶显示屏光开关蝶形单元结构,设计了采用该蝶形单元的定向背光自由立体显示背光源模组.模拟仿真结果表明：所设计的定向背光自由立体显示背光源可消除自由立体显示的串扰;在视点平面90%观看区域的串扰度小于0.5%,光束10%峰值宽度的串扰面积比     

基于TracePro的狭缝光栅自由立体LED显示器件的串扰仿真

利用TracePro仿真软件对狭缝光栅自由立体LED显示器件的串扰进行仿真。首先,通过对狭缝光栅的设计原理分析,并基于LED模块的发光像素面积2mm×2mm,黑矩阵的面积1mm×1mm,设定最佳观看距离为5m的两视点狭缝光栅自由立体LED显示器件,计算出光栅的狭缝宽度和挡光宽度都为2.87mm。其次,利用这些参数,通过TracePro软件建立狭缝光栅自由立体LED显示器件的仿真模型,通过仿真运算得到左、右视频的光照度分布图,并通过归一化发现它们的光照度均匀性较差,观看时会导致\"眩晕\"现象。最后,借助自由立体显示器件串扰的测量方法,根据仿真左、右视频照度分布图的交叉曲线,定性分析了仿真结果,并结合Orign9.1软件定量对仿真的串扰值进行计算,得出其串扰值为42.4%。这为进一步优化狭缝光栅自由立体LED显示器件的设计和性能提供了理论依据和技术支持。     

基于自由曲面的光纤照明用耦合透镜设计

提出一种基于自由曲面的光纤照明用耦合透镜的设计方法。通过非成像光学设计,以光学扩展量与折射定律为理论基础,自由曲面迭代优化,实现光源与光纤之间的低损耗耦合。仿真结果表明:以LED芯片作为光源,该透镜可以将光通量传导效率提高至89%以上,具有良好的应用和发展前景。     

手机全息显示将取代裸眼3D显示

智能手机发展到今天很大程度上已经形成了一种相对饱和的局面。我们发现消费者在面对各种各样千篇一律的智能手机时,很难快速地判断该购买哪款机型。当然,这并不是说手机本身的硬件配置不满足需求,相反目前呈现出的是一种硬件过剩的尴尬局面。     

基于全内反射结构的多自由曲面准直透镜设计

为了有效地收集半导体发光二极管大范围的出射光以实现光能的高效利用,设计一款基于全内反射结构的多个自由曲面准直透镜,该透镜的初始结构是根据Snell定律和能量守恒定律等光学原理的算法设计而成.将该透镜的初始结构导入Creo软件中并进行360°旋转以得到3D实体模型,将其转入TracePro光学软件中进行蒙特卡洛光线追迹的...     

裸眼3D LED显示的全息透镜板在线拼接的检测方法

全息透镜板的高精度拼接与装配是基于全息透镜技术的大屏幕LED裸眼3D显示系统搭建中的关键问题。理论计算与实验结果表明,全息透镜板与LED显示模组横向相对位置误差小于1.332mm时,可以满足显示的要求。基于裸眼3D显示系统的投射条纹,提出了基于投射条纹的全息透镜板位置实时调整方法。依据此方法提出了基于极大值测量条纹中心间距的图像处理算法,并结合LabView编写了图像处理程序。实验结果表明,使用该方法测得的亮暗条纹间距的测量精度为0.1mm,反算出全息透镜板与LED屏之间的位置误差小于0.03mm,满足实时调整全息透镜板位置的要求,可以作为全息透镜板在线拼接的检测方法。     

多视点自由立体显示串扰分析与视区仿真

对多视点自由立体显示的串扰成因进行了分析,推导出了无串扰观看点与光栅参数之间的关系;然后分别对垂直于显示器方向和平行于显示器方向的串扰进行了分析与计算,得到了屏前三维空间的串扰分布情况.仿真结果表明,沿显示屏幕垂直方向的视区范围大于水平方向的视区范围,而且在水平平行于屏幕的方向上,每一个视点存在多个理论无串扰观测点,但在垂直于屏幕方向上,每个视点只存在一个理论无串扰观测点.最后通过对屏前三维区域视点光强进行仿真,进一步验证了串扰计算的准确性,为自由立体显示系统的最佳设计与具体实现奠定了仿真基础.     

一种基于自由曲面的LED准直透镜设计

提出一种能实现准直光束照明的自由曲面透镜设计算法,并基于此算法设计一种以单颗LED为光源的准直透镜。通过建立透镜后表面轮廓曲线上的点所满足的方程,利用迭代方法并结合Matlab编程求出自由曲面轮廓曲线的离散数据点,将数据点导入SolidWorks中进行曲线拟合并建模,进而得到透镜的实体模型。在TracePro中对该透镜进行非序列光线追迹,模拟结果表明:该光学系统能够实现均匀照明,并对最终光线可实现准直出射。     

用于LED集鱼灯稳定照明的自由曲面透镜设计

进行海上灯光诱鱼作业时,船体横摇改变了发光二极管(LED)集鱼灯的照明角度,导致海面光照不断变化,对吸引和聚集趋光性鱼类产生不利影响。提出了一种利用自由曲面透镜实现扇形光强分布的方法,在Y-Z和X-Y平面上的发散角分别为110°和10°。分析了LED集鱼灯在渔船横摇角度变化范围(-10°～10°)内的目标面相对照度分布的相似性和误差率。模拟结果和实验结果的正交归一化相似性(NCC)分别大于98.50%和99.53%,均方根误差(RMSE)分别小于5.56%和4.60%。与普通LED集鱼灯和金卤灯比较,本设计显著提高渔船横摇时LED集鱼灯的光照稳定性。结果表明,在不同照明角度下,LED集鱼灯的自由曲面透镜能很好地实现海面上的稳定光照。     

支撑曲面法设计自由曲面照明透镜

利用能量守恒建立光源与目标之间的网格映射可以用来设计自由曲面照明透镜,然而这种方式设计透镜表面的连续性依赖于映射是否可积。其根本原因是这种预先设定的映射并非照明问题的真实解。为了得到连续的透镜曲面,首先使用支撑曲面法利用一定数量的笛卡尔卵形面构造非连续的自由曲面透镜。以这个透镜为初始设计,通过拟合建立光源与目标面的网格映射。由于初始设计的透镜为照明问题的真实解,因此这个映射满足可积条件。光学仿真表明这种方法设计的透镜可以在目标面达到目标面达到0.77的照度均匀性以及81.6%的光学效率,同时透镜的表面连续。     

Autostereoscopic display based on multi-layer lenticular lens

An autostereoscopic display based on a multi-layer lenticular lens was proposed. The autostereoscopic display is composed of a flat panel display and a multi-layer lenticular lens sheet, which includes a traditional single lenticular lens and an additional transparent layer. The focal length of the multi-layer lenticular lens can be changed by choosing the refractive index of the additional transparent layer to adjust the stereoscopic depth, and it is an easier and much more flexible way than changing lenticular lens's curvature radius. A 22-in. 9-view autostereoscopic display prototype was developed. The image crosstalk of the prototype is very small and it has good presentation to several viewers without wearing eyeglasses.     

Comparative assessment of optical performance for the optical design of HD-DVD micro objective lens with NA 0.65 using aspheric and freeform surfaces

A micro objective lens for HD-DVD with the Numerical Aperture (NA) of 0.65 at blue laser wavelength with clear aperture diameter of 1.5 mm has been designed on acrylic material using freeform surfacing method. Optical performance evaluation parameters have been compared with bi-aspheric surfaces based objective lens design. Freeform surface based design has higher degrees of freedom compare to conventional aspheric surfaces that can reduce aberrations significantly. Maximum RMS error is 0.003λ at 0.4° and maximum RMS radius is 0.027 μm while airy disk radius is 0.3803 μm for freeform surface based design. Hence single freeform surface based design can reduce the fabrication complexity and tooling time, at the same instance provides comparable performance with bi-aspheric surfaces based design.     

Free-form lens design for wide-angle imaging with an equidistance projection scheme

An algorithm of free-form lens design is presented that can realize wide-angle imaging in conjunction with conventional imaging devices. The wide-angle image obtained through the free-form lens and the camera is not affected by distortions. The formula for the free-form lens surfaces is derived. The surface profile of the free-form lens can be generated through solving a differential equation expressing the camera-viewing angle as a function of the angle of incidence on the free-form lens surface. The surfaces preserve a linear relationship between the angle of incidence of light onto the surface and the angle of refraction into the imaging device.     

A novel method to suppress the crosstalk of the system with dispersion compensated by fiber gratings

In this article, a novel method is proposed to suppress the nonlinear crosstalk of the system with dispersion compensated by several multi-wavelength fiber gratings. Random time delay is induced only between the adjacent channels to suppress the cross modulation effects and the four wave mixing effects simultaneously. Using this method, the system performance could be improved effectively.     

新型双向光分插复用器结构实验

提出一种基于FBG和光环形器的双向光分插/复用器（BOADM）结构,并给出两种实验结构.结果表明,该器件在通路间隔100GHz时,异频串扰量－21.4dB、同频串扰量－32dB,均满足WDM系统传输要求.该BOADM采用单面EDFA结构,易于同其他设备连接,适应性较好,设备成本低,同时还具有潜在的自愈保护能力.     

Simple and high efficient optical trapping using a cylindrical lens and a single plane wave of incidence

We suggest a simple and high efficient method for trapping particles in the evanescent field. In this method, a single plane wave is normally incident on the cylindrical surface of a cylindrical lens and then incident on the plane surface of the lens at an angle larger than the critical angle. Multiple reflections of light within the cylindrical lens create two evanescent waves with different directions in the transmitted field. Interference of two evanescent waves comes into being a standing wave which can stably trap particles close to the top of the cylindrical lens. Based on the Rayleigh approximation, we obtain analytical expressions of optical force acting on a Rayleigh particle placed in the vicinity of the lens. We find that the trap stiffness and trap depth is dependent on the radius of the cylindrical lens, wavelength and polarization of light, and incident angle at the lens–liquid interface.     

视点可控液晶光栅的研究

提出一种双层交错结构的驱动电极控制液晶分子偏转的可控液晶光栅.利用光刻和镀膜工艺在玻璃基板上制作掺铝氧化锌-二氧化硅-掺铝氧化锌双层交错结构的驱动电极,采用液晶成盒工艺将制备好的驱动电极基板和公共电极基板组装成液晶盒.与传统单层控制电极相比,双层交错电极实现了基板的无缝覆盖,避免了各电极存在的空白区,使得器件的控制区域变得完整与灵活.光学显微镜测试表明,掺铝氧化锌第一电极和第二电极的宽度为275.8,两者之间通过SiO2介质层隔离并相互交错覆盖在玻璃基板上.结合液晶光栅驱动电路,可控液晶光栅能有效地控制遮光区与透光区的比值,实现不同3D视差图片在同一套系统中的实时切换播放,在多视点3D实时切换显示领域有一定的应用前景.