共面转换液晶显示器的饱和电场

本文从连续体理论出发，利用线性化处理的方法，给出了弱锚定边界条件下，有预倾角的IPS型盒的饱和电压的解析结果。饱和电压随着锚定能的减小而减小，随着预倾角的减小而增大。     

高透过率共面转换液晶显示器

我们开发了一种在同一个基板上使用特殊电极设计的高透过率共面转换(HT-IPS)液晶显示器。这种特殊的电极构造在电极组之间产生实际的水平电场,在电极组区域内的边缘电场具有较高水平场成份。上半部分类似于IPS模式,而下半部分类似于边缘场转换(FFS)模式。HT-IPS模式显示出了很高的透过率[大于扭曲向列相(TN)模式的90%],同时,无论使用正性或负性各向异性的液晶材料,液晶盒都具有宽视角。此外,我们对比了相同条件下HT-IPS与IPS、FFS盒的光电特性。     

共面电场切换液晶显示器面板技术发展的回顾与展望

介绍IPS液晶显示技术的发展史、现况及对未来发展趋势的展望。在IPS技术克服了视角依存的显示基本需求特性,近来在动画质量与色彩再现稳定性方面亦大幅提升。现阶段开发重点则是着重于面板制造低成本、高生产良率和高对比特性,使其能与其它液晶电视技术匹敌。因此,我们成功开发了最具竞争力的新IPS模态,取名为AS-NOOC。与AS-IPS相比较,AS-NOOC具有省去一道Array基板侧的厚有机层制程的低制造成本优势,可大幅提高良率。并利用在彩色滤光片侧导入最佳化电极来同时优化面板亮、暗态的光学特性,有效提高对比度。     

摩擦角度在共面转换液晶显示器中的影响

研究了共面转换液晶显示器中的摩擦角度在显示过程中的作用 ,将摩擦角度从通常的10°增大到 30° ,可大大减小显示器的上升响应速度和增大灰度显示的电压区间 ,对于快速响应和更多灰度显示的液晶电视显示具有特殊的吸引力     

反射式液晶显示器件的新技术

对近几年开发的反射式LCD新技术作了介绍,并对应用这些新技术取得的效果作了说明。     

低驱动电压和快速响应的共面转换液晶显示器

共面转换液晶显示器（IPS-LCD）由于其优异的视角特性和色彩还原能力在TFT-LCD中得到了广泛应用,然而响应速度慢的缺点始终限制着其在高端液晶显示器中的发展。本文中提出一种凸起电极结构的共面转换液晶显示器,并采用TechWiz软件模拟了该结构的电光特性。与传统IPS-LCD相比,我们提出的新结构IPS-LCD的驱动电压降低了2.3 V。在响应时间方面,尽管驱动电压降低了,但是由于凸起电极改变液晶层中的电场状况,因此上升响应速度得到了一定提高。此外,凸起结构减小了液晶层的等效盒厚,因为下降时间正比于液晶盒厚的平方,所以下降响应速度也得到了明显提高,该结构的整体响应速度相比传统结构提高了大约38%。     

共面转换液晶盒的阈值电压

本文从连续体理论出发，给出了强锚定和弱锚定边界条件下，有预倾角时IPS型盒的阈值电压的解析结果。阈值电压随着锚定能的减小而减小，随着预倾角的增大而增大。     

快速响应的共面转换型液晶显示器

共面转换液晶显示器(IPS-LCD)由于其具有可视角度大、色彩真实、画质出色等优点,在平板显示器中得到了广泛应用,然而响应速度慢限制了其在高端显示器中的应用。本文中,首先通过采用正性液晶,对IPS类型中的边缘场转换型(FFS)和边缘场共面转换型(FIS)的液晶显示器,不同摩擦角度下的电光特性和响应时间进行了模拟计算。然后从预倾角度、电极尺寸以及弹性常数出发,对FIS液晶盒结构参数进行了优化,提出了一种快速响应的液晶显示器。我们通过计算机模拟发现,在FFS液晶盒中,摩擦角度对工作电压具有较大影响,小摩擦角度可实现高透过率、低工作电压;而在FIS液晶盒中,摩擦角度对响应时间具有较大影响,大于10°时与2°时相比,响应速度可提高82.7%以上。并且,不同摩擦角度下,弹性常数对FIS液晶显示器的响应速度影响不同,摩擦角度为2°时,响应速度与弹性常数K11、K22、K33都有关,而摩擦角度为12°时,响应速度只与K22有关,这个原因导致了12°与2°时相比,响应速度提高了84.2%。     

ADTEC:对比度为700:1的高清晰液晶显示器

日本ADTEC公司近日发布了支持数码和模拟两种输入的19英寸SXGA(1280×1024像素)液晶显示器“AD-DA19Y”。该产品采用亮度为300cd/平方米,对比度为700:1的高清液晶面板。上下左右视角均为170度。内置左右各1W的立体声扬声器,并且配备了USB集线器功能(一个输入端口,两个输出端口)。有白色和黑色两种机型。主机尺寸为宽419.7mm×高425.9mm×深240.9mm,重量为约6.8kg。估计实际售价为8.28万日元(约合人民币5175元)。ADTEC:对比度为700:1的高清晰液晶显示器…     

共面转换液晶显示器中降低离轴漏光的光学补偿方法

本文综述了在共面转换液晶显示器中使用光学补偿膜降低离轴漏光的方法,应用模拟软件研究了可见光的暗态漏光。首先总结了使用双轴膜补偿方法,发现两个双轴膜的补偿效果优于一个双轴膜;研究和比较了6种单轴膜补偿方法,获得了离轴漏光接近于零的方法;最后研究了8种补偿方法暗态漏光的角度依赖性和波长依赖性。通过光学补偿膜提高液晶显示器中的宽视角特性具有重要的意义。     

VA和IPS液晶盒固有对比度与温度的关系

我们测量了介于“理想”正交偏光片组之间的VA和JPS液晶盒在不同温度下的固有漏光。在温度低于向列相到液态的转变（清亮点）温度时,测量到的VA液晶盒固有漏光与温度变化无关,相反,JPS液晶盒无论是o光模式还是e光模式结构中固有漏光都随温度的增加而增加。我们推导出基于向列相液晶指向矢涨落引起光散射的理论公式,以解释我们的实验结果。     

不同的环境光照下相邻像素的选通态对LCD透射屏测量对比度的影响

研究了不同的环境光照下,相邻像素的选通态对ＬＣＤ透射屏测量对比的影响。结果表明：１．不同的照明条件下ＬＣＤ透射屏的对比度会发生很大的变化,但相邻像素的选通态对测量对比度的影响始终存在;２．与ＬＣＤ反射屏相比,透射屏中相邻像素的选通态对测量对比的影响,主要来自杂散光。     

经验模态分解中多种边界处理方法的比较研究

经验模态分解(EMD)的一个关键问题是处理边界效应。尽管目前除了Huang申请了NASA专利的边界处理方法,仍没有一个最终的解决方案,但工程上已经提出了多种处理方法。本文实现了工程上常用的5种EMD边界处理方法：线性外延,多项式拟合,镜像法,径向基(RBF)神经网络预测和AR预测方法,设计了一套消除了EMD处理中信号的相互作用及模式混淆影响的测试方法,并利用准周期信号和随机信号对它们的边界效应处理结果进行了定量测试。结果表明镜像法是目前相对最优的EMD边界处理方法。     

A Novel Approach for Achieving High‐Efficiency Photoelectrochemical Water Oxidation in InGaN Nanorods Grown on Si System: MXene Nanosheets as Multifunctional Interfacial Modifier

MXene nanosheets with attractive electrical conductivity and tunable work function have been adopted as multifunctional interfacial modifier between InGaN nanorods and Si for photoelectrochemical water oxidation for the first time. Compared to bare InGaN/Si systems, MXene interfacial layers give rise to an ultralow onset potential of 75 mV versus reversible hydrogen electrode (RHE), which is the highest ever reported for InGaN‐ or Si‐based photoanodes by interfacial modification. Furthermore, the modified photoanode exhibits a significantly enhanced photocurrent density (7.27 mA cm^?2) at 1.23 V versus RHE, which is about 10 times higher than that achieved with the InGaN/Si photoanode. The detailed mechanism demonstrates that the formed type‐II band alignment in InGaN/MXene heterojunction and an Ohmic junction at the MXene/Si interface make MXene an ideal electron‐migration channel to enhance charge separation and transfer process. This synergetic effect of MXene can significantly decrease the charge resistance at semiconductor/Si and semiconductor/electrolyte hetero‐interfaces, eventually resulting in the fast hole injection efficiency of 82% and superior stability against photocorrosion. This work not only provides valuable guidance for designing high‐efficiency photoelectrodes through the integration of multiscale and multifunctional materials, but also presents a novel strategy for achieving high‐performance artificial photosynthesis by introducing interfacial modifier.     

A New View of Microcrystalline Silicon: The Role of Plasma Processing in Achieving a Dense and Stable Absorber Material for Photovoltaic Applications

To further lower production costs and increase conversion efficiency of thin‐film silicon solar modules, challenges are the deposition of high‐quality microcrystalline silicon (μc‐Si:H) at an increased rate and on textured substrates that guarantee efficient light trapping. A qualitative model that explains how plasma processes act on the properties of μc‐Si:H and on the related solar cell performance is presented, evidencing the growth of two different material phases. The first phase, which gives signature for bulk defect density, can be obtained at high quality over a wide range of plasma process parameters and dominates cell performance on flat substrates. The second phase, which consists of nanoporous 2D regions, typically appears when the material is grown on substrates with inappropriate roughness, and alters or even dominates the electrical performance of the device. The formation of this second material phase is shown to be highly sensitive to deposition conditions and substrate geometry, especially at high deposition rates. This porous material phase is more prone to the incorporation of contaminants present in the plasma during film deposition and is reported to lead to solar cells with instabilities with respect to humidity exposure and post‐deposition oxidation. It is demonstrated how defective zones influence can be mitigated by the choice of suitable plasma processes and silicon sub‐oxide doped layers, for reaching high efficiency stable thin film silicon solar cells.     

An improvised indexing technique for XML data over multiple channels in wireless environment: (1, Xm) method

Wireless broadcasting is the new emerging standard for disseminating the information. It also exploits the feature of mobile computing environment, i.e., an asymmetric environment where the bandwidth of downloading is much higher than the bandwidth of uploading. Due to the small devices, created to hold the feature of portability, various difficulties are imposed on the system. The mobile client follows some energy restricted traits to be efficient. Those traits are access time and tuning time. Access time basically tells the efficiency of the system by specifying how fast a user may get data. But tuning time measures the battery life of the device. In this paper, we have proposed (1, X_m) method to deal with these. Here, X_m basically implies the XML data passing on to the multiple channels. In this technique, we have sent data by indexing onto two different channels: index and data channel. We have analyzed the performance of the proposed indexing technique. To prove its validity, the improved results are compared with the former indexing techniques analytically and experimentally.