微型显示器件与头戴显示器

近年来平板显示在微型显示领域取得了快速的技术进展，为可戴式显示器提供了新型显示器件，本文介绍几种微型显示器件的主流技术和头戴显示器新进展。     

平板显示器件技术与进展

阐述了各类显示器件目前的技术发展状况，着重介绍了等离子体显示器、有机电致发光器件、场致发射器件和液晶投影等。     

微型显示器技术(一)

什么是理想的便携式显示器？有一类便携式显示器体积小,重量轻,功耗低,能够显示几乎充满你视野的、大而明亮的高清晰度图像,这就是本文介绍的一类新型显示器件--微型平板显示器,文中描述了微显示器的主要应用领域及技术发展现状,并粗略介绍了相关的生产工艺技术.     

GPS应用显示器发展趋势分析

本文阐述了全球定位系统的原理及显示器在ＧＰＳ系统中的重要性，介绍了平板显示器件的最新进展，分析了各种显示器件在ＧＰＳ不同范围的应用。提出了今后ＧＰＳ开发系统中显示器的发展方向。     

显示器知多少

一、概述显示技术用于信息显示,利用电子技术可以把看不见的电信号转变成可见光信号。显示技术,除在电视和雷达方面有着重要用途之外,在其它方面,如仪器仪表、家用电器和计算机等方面,应用也相当广泛。二、显示器的分类当今世界,各国科研人员沿着不同途径,使用不同方法来研制和开发新型显示器件。因此,显示器件的种类和型号繁多。1.电子束显示器(CRT)     

立体电视动态图像显示技术

近年来随着数字图像处理等基础技术的发展,人们对以液晶为主的显示器件和成像器件能在立体电视动态图像显示技术领域取得进展寄与了期待。因此,有关无需采用眼镜的三维图像显示器的研究开发活动颇为盛行,与微机相匹配的三维显示器和家用立体电视机的问世,促使其应用亦在迅速发展。这种三维图像显示器的开发和实用,将对信息     

液晶显示的现状及发展趋势

液晶显示器件门(LCD)是当今最有发展前途的平板显示器件之一,它被世界公认为显示器件发展的未来,日本人称其为“二十世纪最后几项大型技术之一”.液晶显示装置是由美国RCA公司开发并于1968年公布于世的.此后,日本的夏普、精工和卡西欧公司最先接过美国的研究成果并使其商品化.在七十年代初用于数字钟表和电子计算器等的液品显示器开始进行大批量生产并普及.现在LCD已成为仅次于阴极射线管(CRT)的主要     

等离子体显示器产业的最新进展

综述了彩色等离子体显示器（PDP）产业的最新进展和世界各公司对PDP显示器市场的分析和预测,指出了PDP显示器已成为世界显示器件继CRT和TFT－LCD之后的又一大规模投资热点,制约PDP显示器普及的价格问题将随着技术的进步和生产规模的扩大逐步得到解决,DPD显示器产业已成为平板显示领域中最具有活力的产业之一。     

碳纳米管(CNT)场发射显示器的关键技术的研究

对碳纳米管阴极的制备以及场发射显示器的真空封装技术进行了研究.利用一种新的碳纳米管生长工艺制备出了具有优良场发射性能的碳纳米管阴极.并将这种直接生长的碳纳米管薄膜作为阴极,结合一种弹性封装工艺,开发了一种具有简单字符显示功能的场发射显示器.该显示器在较低的工作电压下就可获得高亮度的显示效果,并且器件的亮度与驱动电压成较好的线性关系,这将有利于未来的碳纳米管场发射显示器实现高亮度和多级灰度显示.器件的持续工作寿命测试已经超过5500小时,充分验证了碳纳米管作为场发射阴极的应用潜力.     

液晶显示器新技术

目前在平板显示器中占据统治地位的是液晶显示器(LCD),它的市场规模已经接近传统的CRT器件.本文回顾了现阶段液晶显示器的几个研究热点,包括透反射液晶显示器、多晶硅薄膜晶体管技术及硅基液晶.     

An analog scrambling scheme which does not expand bandwidth, Part II: Continuous time

The techniques developed in Part I[1] for discrete-time analog scrambling are applied to the problem of scrambling band-limited continuous-time signals or waveforms. The idea behind the waveform scrambler is to sample the waveform (which is assumed to be band-limited) at a rate exceeding the Nyquist rate. The resulting sequence of samples is band-limited in the sense of Part I. The discrete-time scrambler described in Part I is applied to this sequence to produce a nearly band-limited scrambled sequence. A scrambled waveform is formed by modulating the amplitudes of a chain of pulses. This scrambled waveform can be transmitted over a band-limited channel, and the original unscrambled waveform can be recovered at the receiver.     

Antenna patterns of nonsinusoidal waves with the time variation ofa Gaussian pulse II

For pt.I see ibid., vol.30, no.4, p.504 (1988). In Part I of this series of papers, antenna patterns for nonsinusoidal waves with the time variation of a Gaussian pulse, received (or radiated) by a linear array of sensors (or radiators) were derived. Computer plots of the peak-amplitude pattern, peak-power pattern, energy pattern, and slope pattern were presented. In this paper, the above antenna patterns are derived for a planar array of sensors (or radiators) receiving (or radiating) Gaussian pulses. Based on the characteristics of the Gaussian pulse, which are presented in Part I, the principle of frequency-domain array beam forming with Gaussian pulses is described. An expression for the antenna energy pattern based on the frequency-domain analysis is derived and plotted for comparison to the one obtained in Part I from the time-domain analysis     

Myoelectric Signal Processing: Optimal Estimation Applied to Electromyography?Part I: Derivation of the Optimal Myoprocessor

This paper (Part I of II) describes the development of a novel technique for processing the electrical activity of muscle which uses multiple channels of myoelectric activity. A phenomenological mathematical model of myoelectric activity is formulated. From this model, a mathematical statement of the optimal myoelectric signal processor is derived, and some of its properties are investigated. This mathematical statement encompasses and places in perspective almost all single-channel myoprocessor developments to date, as well as specifying the optimal multiple-channel myoprocessor. An experimental demonstration of the efficacy of this processor is presented in a subsequent paper (Part II).     

A study of soft and hard breakdown - Part II: Principles of area,thickness, and voltage scaling

For Part I see ibid., vol.49, no.2, pp.232-8 (2002). Based on the theory of soft and hard breakdown established in Part I of this paper, we now study the principles of area, thickness, voltage, and circuit configuration dependence of hard and soft breakdown. These scaling principles allow us to conclude that breakdown in ultrathin oxides stressed at operating voltages (1.0-1.5 V) can never be hard, which should allow a more relaxed reliability specification for these oxides     

An analysis of the performance of a handset diversity antennainfluenced by head, hand, and shoulder effects at 900 MHz .II.Correlation characteristics

For pt.I see ibid., vol.50, no.3, p.830-44 (2001). In Part I of this two-part paper, we described the effective gain characteristics of the handset diversity antenna comprising a retractable whip antenna and a built-in planar inverted F antenna (PIFA). In order to achieve a high diversity effect, the correlation between the diversity branches must be small while at the same time maintaining a high effective gain, and this is contained in this paper. Further analysis includes an evaluation of the diversity gain with which the diversity effect shown by the analyses of the effective gain in Part I and the correlation in Part II is described. In addition, the mechanism for obtaining a small correlation coefficient is clarified by investigating the amplitude and phase radiation patterns when the whip length and the body inclination angle are changed. From these we obtain various numerical results that provide sufficient insight for design purposes. The validity of the analytical results is verified by an experiment in an indoor radio wave propagation environment     

A Unified Approach to Serial Search Spread-Spectrum Code Acquisition--Part I: General Theory

The purpose of this two-part paper is threefold: 1) Part I discusses the code-acquistion problem in some depth and 2) also provides a general extension to the approach of analyzing serial-search acquisition techniques via transform-domain flow graphs; 3) Part II illustrates the applicability of the proposed theoretical framework by evaluating a matchedfilter (fast-decision rate) noncoherent acquisition receiver as an example. The theory is formulated in a general manner which allows for significant freedom in the receiver modeling. The statistics of the acquisition time for the single-dwell [2], [3] andN-dwell [5] systems are shown to be special cases of this unified approach.     

Partial-fraction expansion: Part 2

For Part 1 see ibid., vol.5, pp.42-44 (June 2002). In Part 1 of our discussion, after describing a simple procedure for obtaining the partial-fraction expansion (PFE) of a rational function having distinct poles only, we took some precursory steps toward an elegant algorithm by Chin and Steiglitz (1977) applicable to the general case in which the proper rational function contains multiple poles. In this article we develop Chin and Steiglitz' algorithm by rewriting the rational function in a nested form and derive a code for synthetic division.     

Optical communication with two-photon coherent states--Part III: Quantum measurements realizable with photoemissive detectors

In Part I of this three-part study it was shown that the use of two-photon coherent state (TCS) radiation may yield siginificant performance gains in free-space optical communicatinn if the receiver makes a quantum measurement of a single field quadrature. In Part II it was shown that homodyne detection achieves the same signal-to-noise ratio as the quantum field quadrature measurement, thus providing a receiver which realizes the linear modulation TCS performance gain found in Part I. Furthermore, it was shown in Part il that ff homodyne detection does exactly correspond to the field quadrature measurement, then a large binary communication performance gain is afforded by homodyne detection of antipodal TCS signals. The full equivalence of honmdyne detection and single-quadrature field measurement, as well as that of heterodyne detection and two-quadrature field measurement, is established. Furthermore, a heterodyne configuration which uses a TCS image-band oscillator in addition to the usual coherent state local oscillator is studied. This coafiguration termed TCS heterodyne detection is shown to realize all the quantum measurements described by arbitrary TCS. The foregoing results are obtained by means of a representation theorem which shows that photoemissive detection realizes the photon flux density measurement.