中国的LCOS机遇

因为LCOS电视的比较开放的技术平台和潜在的节约成本优势,在中国政府的支持下,中国制造商正在集中力量发展LCOS电视。文中详细地叙述了中国要在该领域取得成功需要做些什么事情。     

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.     

高精度亚像素显示技术动态天体模拟器

为了解决常规姿态敏感器非在轨标定设备实测结果与设计精度存在偏差、且缺乏模拟目标天体特征功能的实际问题,本文提出一种利用多棱镜结合的LCOS光学拼接方式与亚像素显示技术相结合的高精度动态天体模拟器设计方法,实现对星点位置以及目标天体特征的精确模拟。详细论述了传统LCOS拼接形式两片光阀对比度低的原因,提出了基于两片PBS和两片半反半透镜的拼接架构改进方案;设计了小畸变、复消色差的高成像质量准直光学系统。重点阐述了亚像素显示技术的思想及方法,利用亚像素技术分别对动态星图和目标天体进行仿真并进行了实验测试。结果表明:模拟器的两片LCOS显示对比度相同,动态星图的星间角距误差小于±6″、星等模拟范围达到连续8个等级、星等模拟精度优于±0.3mV;可以提供目标天体特征模拟图片。高精度亚像素显示技术动态天体模拟器消除了LCOS显示对比度差异,达到了姿态敏感器识别特征点的准确性要求,基本可以满足敏感器非在轨精度标定与功能测试的要求。     

编码衍射图样的相位检索

经典的迭代相位检索方法具有抗噪性能差、不 能收敛到全局最优解等缺点;而基于相位割(PC)的最优化相位检索技术通过精确的分离振幅 和相位变量, 将相位检索问题转化 为二次约束的凸规划问题,理论上可以保证在相差全局相位因子条件下收敛到全局最优解。 本文提出用更结构 化和更“很少随机的”的三元与八元掩膜编码衍射图样(CDP),求解PC以获得丢失的 相位。模拟实验首先测试 一维复信号,分别比较不同掩膜重构的成功率。其次,比较它们对二维分子图像的重构结果 。实验结果表 明,本文方法可以获得比传统的基于二元掩膜的方法更好的重构结果。将恢复的相位分 布加载到所搭 建的基于Si基液晶(LCOS)的光学重构系统中,产生的CDP证明了所提方法的正确性。     

嵌入LCOS芯片的参考电压源模块方案设计

本文提出了嵌入LCOS芯片的参考电压源模块的方案设计，分析了参考电压的作用，给出了方案设计的总体框图和部分电路低功耗的实现方法。     

LCOS投影显示技术专利现状

文章基于中国专利数据库和德温特世界专利索引数据库,对LCOS投影显示技术领域的专利申请进行了统计分析,为相关人员提供参考。     

LCOS是数字电视显示技术的最佳选择中国是LCOS最佳成长地区

LCOS技术作为一种新兴的微显示技术,是目前世界上唯一没有垄断性专利的技术。与其它显示技术相比,该技术具有高清晰度、高亮度、高对比度、潜在的低成本等特点,必将成为未来数字电视的主流技术。本文就LCOS技术产业化状况进行了分析,指出在中国进行LCOS产业化有着雄厚的产业基础和优势,前景十分光明。     

Uniformity metrology in ultra‐thin LCoS LCDs

Abstract— The synergy between measurement methodology and process development to monitor, control, and qualify the uniformity of the ultra‐thin‐cell gap single‐panel liquid‐crystal‐on‐silicon (LCoS) device.     

Microdisplay‐based industrial 3‐D and microstructure measurement systems

Abstract— Microdisplays, whether they are of the liquid‐crystal‐on‐silicon (LCOS) or organic light‐emitting diode (OLED) type, have been, up until now, mainly used in multimedia applications or head‐mounted displays. Due to their interesting possibilities, these displays open more and more alternative applications; for example, in optical metrology. Projection lenses for this application area need to be specially designed because the requirements on these systems differ completely from those for multimedia applications. The lenses must have very low geometrical image distortion and they have to be adapted to small objects and/or image distances. On the other hand, they often work with light sources with small spectral bandwidths; consequently, they do not need to be corrected for chromatic aberrations. In addition, the numerical aperture has to be large enough to collect and transfer as much light as possible, but also the size of the projection lens has to be as small as possible to ensure compact measurement systems. All these requirements lead to a compromise in optical lens design. Three optical system designs and realizations — one with an OLED microdisplay and two with an LCOS microdisplay — are presented.     

Analog LCOS SLM devices for AR display applications

Liquid crystal on silicon (LCOS) device is a potential candidate for spatial light modulators (SLMs) due to its high resolution and the wide range of tunable phase retardation. Besides the telecom applications, SLM is also very promising for display applications, especially for the augmented reality (AR) displays. In this paper, we will discuss the advantages of analog LCOS SLM compared with the digital one. A 0.6‐in short‐loop sample test result with precise cell gap controlled is discussed. A fast liquid crystal with high birefringence that attains less than 2.5‐ms full‐on–full‐off response time is also introduced. Regarding the computer‐generated hologram (CGH), a new algorithm called multiconstraints angular spectrum algorithm (MASA) is proposed to enhance the image quality of dual‐plane holographic projection.