Processes,characterizations, and system applications of color‐filter liquid‐crystal‐on‐silicon microdisplays

Abstract— A color‐filter liquid‐crystal‐on‐silicon (CF‐LCOS) microdisplay that integrates color filters on silicon for color will be presented. The color‐filter process on silicon was optimized to achieve fine resolution and precise alignment of the color filters on the pixel array, good adhesion to the silicon suface, and a flat surface for the liquid‐crystal cell assembly. Important optical and electrical parameters of the color filters were extracted to establish an electro‐optical model of the CF‐LCOS microdisplays for device simulation. Thermal, chemical, and light‐stability characterizations were performed to ensure the stabilty of the color filters and CF‐LCOS microdisplays. With color CF‐LCOS microdisplays already available, the projection or viewing optics is greatly simplified. This CF‐LCOS microdisplay is ideal for near‐to‐eye displays because of its low‐power consumption and compactness. The CF‐LCOS microdisplay could also withstand medium light illumination for medium‐sized projectors. A single‐panel projector based on one CF‐LCOS microdisplay of 1280 × 768 × RGB resolution was demonstrated.     

LCOS头盔微显示器光学系统设计

二元衍射光学元件作为一种成像元件具有任意相位分布、特殊色散、平像场、温度稳定等性质,同折射元件相结合可以实现许多传统成像光学不能达到的目标.本文设计一个用于0.56″LCOS头盔显示器的光学系统.该系统由三片折射透镜和一个二元衍射面构成,具有10 mm出瞳直径和20 mm眼点距.同传统光学系统相比较,该折/衍混合系统具有更长的工作距离和更好的成像质量,中心视场在35 lp/mm处的传递函数值大于0.4.     

双氟二苯乙炔类液晶的高对比度垂面取向

通过在SiO2无机层上蒸镀长链醇的取向方法以及摩擦聚酰亚胺层的取向方法，证明了高双折射率、负介电各向异性双氟二苯乙炔液晶具有优良的垂面取向特性。添加5～10％的异硫氰基二苯乙炔不但改善了对比度，而且提高了质量因数。缺点是使阈值电压升高。     

Magnetically inert medical projection system with an image‐guiding optical fiber

Abstract— A visual system for stimulating specific human brain functions inside a clinical magnetoencephalography (MEG) measurement chamber was developed. This system is based on a three‐panel LCOS projection unit and uses a 4.5‐m‐long image‐guiding optical‐fiber bundle to transfer the image into the magnetically shielded MEG measurement chamber. In addition to a proper optical system design, special attention had to be paid to all materials used inside the magnetically shielded chamber. Here, no interfering fields due to electrics or ferromagnetic materials are allowed. The system concept, optical design, and the realized prototype are presented.     

Design of a compact projection display for the visualization of 3‐D images using polarization sensitive eyeglasses

Abstract— A compact optical architecture of a three‐dimensional projection display that simultaneously generates two full‐color images with an orthogonal polarization state is presented. The minimal size of the optical engine was investigated and a compact illumination system using light‐emitting diodes as light sources was designed. The effect of dichroic mirrors in the illumination path on the stereoscopic images was also investigted.     

Wire‐grid polarizers in modern LCOS light‐engine configurations

Abstract— Wire‐grid polarizers that have a very high transmission, reflection, polarized‐light optical performance, and opto‐mechanical packaging advantages compared to the older polarization technologies have been developed. The wire‐grid polarizer operation principles and performance data are reviewed. The power of using finite‐difference time‐domain (FDTD) modeling techniques to understand the interaction of the electromagnetic waves with the wires and improve the optical performance of the wire‐grid polarizers and ultimately the light‐engine optical performance is shown. The ability to ray trace through a complete digital projector light engine from light source to the screen, including the wire‐grid polarizers, will be discussed. The main focus is to present the modern LCOS light‐engine architectures that use the wire‐grid polarizers. One‐, two‐, and three‐panel LCOS light engines are covered.     

LCOS激光投影显示亮度均匀性和色度均匀性的测量及校正系统

为了提高激光投影显示画面的亮度均匀度和色度均匀度,提出了一种对灰度值很大和很小的像素点采用大压缩率,并尽可能多地提高中等灰度值的方法.搭建一个由投影显示、相机和计算机构成的闭环系统对应于此种方法,以达到亮度均匀度和色度均匀度矫正的目的.实验和分析表明,通过该系统,投影显示的整个屏幕的亮度均匀性和色度均匀性得到了很大提高...     

激光为光源的液晶自适应眼底成像系统

摘要：本文介绍了基于液晶波前校正器的模拟人眼眼底自适应成像系统,该系统采用Shark-Hartman波前探测器进行波面探测,将探测所得波前畸变经过计算处理转化为灰度图通过电脑施加到LCOS上进行波面校正,通过校正人眼像差的方式来提高系统成像质量。经过校正后系统波前误差从1.92m降低到0.048m系统分辨率接近70lp/mm已经到达该光学系统衍射极限分辨。     

Analysis of diabatic compressed air energy storage systems with artificial reservoir using the levelized cost of storage method

A detailed analysis has been carried out to assess the thermodynamic and economic performance of Diabatic Compressed Air Energy Storage (D‐CAES) systems equipped with above‐ground artificial storage. D‐CAES plant arrangements based on both Steam Turbine (ST) and Gas Turbine (GT) technologies are taken into consideration. The influence of key design quantities (ie, storage pressure, turbine inlet pressure, turbine inlet temperature) on efficiency, capital and operating costs is analysed in detail and widely discussed. Finally, D‐CAES design solutions are compared with Battery Energy Storage (BES) systems on the basis of the Levelized Cost of Storage (LCOS) method. Results show that the adoption of D‐CAES can lead to better economic performance with respect to mature and emerging BES technologies. D‐CAES ST based solutions can achieve a LCOS of 28 €cent/kWh, really close to that evaluated for the better performing BES system. Interesting LCOS values of 20 €cent/kWh have been attained by adopting D‐CAES plant solutions based on GT technology.     

Glass substrate for micro display devices

Glass substrate suitable for wearable micro display devices for augmented/virtual reality was developed. This glass has highly matched thermal expansion coefficient with that of silicon, and it enables to suppress the amount of warpage caused by the boding between Si and glass wafers. The glass also shows lower thermal shrinkage than that of conventional non‐alkali glass for thin‐film transistor substrate. In this paper, the effect of the temperature dependence of the thermal expansion coefficient on warpage generation after bonding process was investigated using both numerical simulation and experiment. The newly developed glass showed remarkably low warpage after the bonding process.