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Measurement of the optical characteristics of electrowetting prism array for three-dimensional display

机译：三维显示电润湿棱镜阵列光学特性的测量

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摘要

Recently liquid-based optical devices are emerging as attractive components in three-dimensional (3D) display for its compact structure and fast response time. Among them an electrowetting prism array is one of the promising 3D devices. It steers a beam, which enables to provide corresponding perspectives to observer. For high quality autostereoscopic 3D displays the important factors are the beam steering angle and the beam profile, the optical characteristics. In this paper, we propose a method to measure the optical characteristics of the liquid prism and show experimental results on our prototype electrowetting prism array, which consists of prisms with 200um by 200um size. A modified 4-f system is adopted for the proposed method. It provides two kinds of information of the optical characteristics of the liquid prism at the image plane and at the Fourier plane. First, the proposed measurement setup magnifies the image of the liquid micro prism array so that we can observe the status of the each prism array directly with bare eye and align a mask easily for selecting a prism to be examined at the image plane. Secondly, the steering angle can be calculated by measuring the displacement of the beam at the Fourier plane, where the angular profiles that have important information on the oil-water interface is observed precisely. The principle of the proposed method will be explained, and the measured optical characteristics from experimental results on the liquid prism we fabricated will be provided, which proves the validity of the measurement method.
机译：近年来，基于液体的光学设备因其紧凑的结构和快速的响应时间而成为3D（3D）显示器中有吸引力的组件。其中，电润湿棱镜阵列是有前途的3D设备之一。它操纵光束，从而可以为观察者提供相应的视角。对于高质量的自动立体3D显示器，重要的因素是光束转向角和光束轮廓以及光学特性。在本文中，我们提出了一种测量液体棱镜光学特性的方法，并在我们的原型电润湿棱镜阵列上显示了实验结果，该阵列由200um x 200um尺寸的棱镜组成。该方法采用了改进的4-f系统。它提供了在像平面和在傅立叶平面上液体棱镜的光学特性的两种信息。首先，建议的测量设置会放大液体微棱镜阵列的图像，以便我们可以用裸眼直接观察每个棱镜阵列的状态，并轻松对准掩模以选择要在图像平面上检查的棱镜。其次，可以通过测量光束在傅立叶平面上的位移来计算转向角，在那里可以精确观察到在油水界面上具有重要信息的角度分布。解释了该方法的原理，并提供了在我们制作的液体棱镜上从实验结果中测得的光学特性，从而证明了该方法的有效性。

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