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NOVEL POLYMER WIDE VIEWING ANGLE COMPENSATION FILMS FOR LIQUID CRYSTAL DISPLAYS(LCDS)
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作者 JasonJ.Ge BruceF.Li +2 位作者 FrankW.Harris StephenZ.D.Cheng StephenZ.D.Cheng 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2003年第2期223-230,共8页
We report on generating uniaxial negative birefringent compensation films, made of specifically designedpolyimides. These polymers were synthesized via a polycondensation of dianhydride [such as 2, 2' -bis(3, 4-di... We report on generating uniaxial negative birefringent compensation films, made of specifically designedpolyimides. These polymers were synthesized via a polycondensation of dianhydride [such as 2, 2' -bis(3, 4-dicarboxyphenyl)hexafluoropropane dianhydride] and 2, 2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl. The uniaxial negative birefringent (n_x =n_y > n_z) polyimide substrates are achieved using a solution-casting method in conventional solvents, which exhibit thedesirable optical phase retardation [(n_x - n_z)×d] values from 50 to 400 nm varying with the film thickness. In thesepolyimide films, the long chain rigid molecules adopt intrinsic planar orientaion. In detail, the majority of phenylene-imiderings and phenylenes preferentially adopt nearly planar conformations parallel to the film substrae. In addition, these filmsalso possess high transparency (or transmittance) and little color shift. The unique color dispersion curve indicates that thistype of materials is very suitable for the applications in LCDs due to an excellent mimic for the retardation color dispersioncurve with respect to LC molecules. Significantly low in-plane retardation (< 1 nm) allows this new technology based film toachieve sufficiently high contrast ratio while highly negative retardation dramatically suppresses the gray scale inversion toimprove the viewing angle performance in a variety of new mode LCDs. 展开更多
关键词 Compensation films liquid crystal displays Polyimides
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COMPENSATION EFFECT OF POLYIMIDE THIN FILMS ON NORMALLY WHITE TWISTED NEMATIC LIQUID CRYSTAL DISPLAYS
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作者 李宝忠 何天白 丁孟贤 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1997年第2期139-145,共7页
The disadvantages of Normally White Twisted Nematic Liquid Crystal Display (NW-TN-LCD) were discussed. The reason that the negative birefringent polyimide thin films were used to compensate NW-TN-LCD to decrease off-a... The disadvantages of Normally White Twisted Nematic Liquid Crystal Display (NW-TN-LCD) were discussed. The reason that the negative birefringent polyimide thin films were used to compensate NW-TN-LCD to decrease off-axis leakage, improve contrast ratios and enlarge viewing angles was explained in this paper. A certain polyimide thin film was taken as an example to show compensation effect on NW-TN-LCD. 展开更多
关键词 polyimide thin films RETARDATION compensation negative birefringence normally white twisted nematic liquid crystal display
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Liquid Crystal Motion Picture Projector 被引量:37
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作者 SHI Yongji(Luoyang Technology College,Luoyang 471003,CHN)Abstract: A liquid crystal moving picture projector and method are described.Light incident on a liquid crystal display-type device is selectively scattered or transmitted by respective portions of liquid crystal display,and a projection mechanism projects an image formed by either such scattered light or such transmitted light.A liquid crystal moving picture projector includes a liquid crystal display for creating characteristics of an image,and projecttion optics for projecting images sequentially created by the display.The display includes a liquid crystal material capable of temporary storing information at respective areas.The temporary storage may be a function of charge storing directly on liquid crystal material.A method of projecting plural images in sequence includes:creating an image or characteristics of an image in a liquid crystal material,storing such image in such liquid crystal material,directing light at such liquid crystal material,projecting such image as a function of light transmitted through or scattered by such liquid crystal material,and creating a further image in such liquid crystal material for subsequent projection. 《Semiconductor Photonics and Technology》 CAS 1997年第3期198-203,共6页
LiquidCrystalMotionPictureProjector①SHIYongji(LuoyangTechnologyColege,Luoyang471003,CHN)Abstract:Aliquidcrys... LiquidCrystalMotionPictureProjector①SHIYongji(LuoyangTechnologyColege,Luoyang471003,CHN)Abstract:Aliquidcrystalmovingpicturep... 展开更多
关键词 liquid crystal Display liquid crystal Projector Projection Optics
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Development of hydrometallurgical process for indium recovery from waste liquid crystal display using Cyphos IL 101 被引量:4
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作者 Sumitra NAYAK Niharbala DEVI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第9期2556-2567,共12页
The main goal of this study was to recover indium from the waste liquid crystal display(LCD)panel.In this context,an ionic liquid Cyphos IL 101 was explored.The extraction parameters such as equilibration period,acid ... The main goal of this study was to recover indium from the waste liquid crystal display(LCD)panel.In this context,an ionic liquid Cyphos IL 101 was explored.The extraction parameters such as equilibration period,acid concentration,chloride ion concentration,hydrogen ion concentration were examined on the extraction efficiency of Cyphos IL 101 towards In(III).Quantitative extraction of indium was found at 2.0 mol/L HCl using 0.005 mol/L Cyphos IL 101 and quantitative stripping with 1.0 mol/L H2SO4.Job’s method was used to determine the extracted species and R3R'PInCl4(R=C6H13;R′=C14H29)was proposed.Based on the observations on multi-metal studies,Cyphos IL 101 was further employed for the removal of indium,tin and copper from the leach liquors of waste LCDs.Optimized conditions were generated for the recovery of indium from waste LCDs.McCabe−Thiele diagram analysis,counter-current extraction and selective stripping were carried out to separate the metal ions,i.e.,indium,tin and copper.Two stages at O/A ratio of 1:3 were required for complete removal of tin from the feed and selective stripping of In and Sn was achieved using 0.1 mol/L H2SO4.A scheme for separating indium from the waste LCDs was proposed. 展开更多
关键词 INDIUM extraction SEPARATION Cyphos IL 101 liquid crystal display panel
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Optical simulation of in-plane-switching blue phase liquid crystal display using the finite-difference time-domain method 被引量:1
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作者 窦虎 马红梅 孙玉宝 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期117-121,共5页
The finite-difference time-domain method is used to simulate the optical characteristics of an in-plane switching blue phase liquid crystal display.Compared with the matrix optic methods and the refractive method,the ... The finite-difference time-domain method is used to simulate the optical characteristics of an in-plane switching blue phase liquid crystal display.Compared with the matrix optic methods and the refractive method,the finite-difference timedomain method,which is used to directly solve Maxwell's equations,can consider the lateral variation of the refractive index and obtain an accurate convergence effect.The simulation results show that e-rays and o-rays bend in different directions when the in-plane switching blue phase liquid crystal display is driven by the operating voltage.The finitedifference time-domain method should be used when the distribution of the liquid crystal in the liquid crystal display has a large lateral change. 展开更多
关键词 finite-difference time-domain method blue phase liquid crystal display in-plane switching convergence effect
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Novel cell parameter determination of a twisted-nematic liquid crystal display
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作者 黄霞 荆海 付国柱 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第3期950-953,共4页
In this paper a novel method is proposed to determine the cell parameters including the twist angle, optic retardation and rubbing direction of twisted-nematic liquid crystal displays (TNLCD) by rotating the TNLCD. ... In this paper a novel method is proposed to determine the cell parameters including the twist angle, optic retardation and rubbing direction of twisted-nematic liquid crystal displays (TNLCD) by rotating the TNLCD. It is a single-wavelength method. Because using subtraction equation of transmittance as curve fitting equation, the influence of the light from environment and the absorption by polarizer, the sample of TNLCD and analyser on the transmittance is eliminated. Accurate results can also be obtained in imperfect darkness. By large numbers of experiments, we found that not only the experimental setup is quite simple and can be easily adopted to be carried out, but also the results are accurate. 展开更多
关键词 liquid crystal display twist angle optical retardation rubbing direction
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Cinnamate-functionalized hyperbranched polymer as liquid crystal photo-alignment layer
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作者 Bin Jun Shen Zheng Xie Ya Ning He Yan Qing Lian 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第9期1131-1134,共4页
In this work, 4-methoxylcinnamoyl chloride was reacted with a commercial hyperbranched polymer (Boltom-TM H30) to prepare a hyperbranched photosensitive polymer (H30-Ci). The polymer was characterized by UV absorp... In this work, 4-methoxylcinnamoyl chloride was reacted with a commercial hyperbranched polymer (Boltom-TM H30) to prepare a hyperbranched photosensitive polymer (H30-Ci). The polymer was characterized by UV absorption spectrum and 1H- NMR spectrum. After processed by Linearly Polarized Polymerization (LPP) method, the spin-coated films of H30-Ci were used as photo-alignment layers to assemble liquid crystal (LC) cells containing nematic liquid crystal (5CB). The observation by polarized microscope showed that the H30-Ci blended with a linear polymer (BP-AN-Ci) photo-alignment layers could align LC molecules in a very uniform way. 展开更多
关键词 Hyperbranched polymer Photo-alignment layer Linearly polarized polymerization (LPP) liquid crystal display
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Electro-optical Properties of Liquid Crystal Composite Materials
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作者 SHIYong-ji BAIXu-can 《Semiconductor Photonics and Technology》 CAS 1999年第2期65-73,81,共10页
The liquid crystal composite materials consist of microdroplets of liquid crystals which are spontaneously formed in a matrix of a polymer at the time of its polymerization. The director configuration in liquid crysta... The liquid crystal composite materials consist of microdroplets of liquid crystals which are spontaneously formed in a matrix of a polymer at the time of its polymerization. The director configuration in liquid crystal droplets, the model of orientation of droplets, and the contrast ratios of a cell are investigated. Droplet size, spacing and distribution are readily controlled in these materials to allow optimization of displays based upon electrically controlled light scattering from the liquid crystal droplets. Preliminary experimental and theoretical studies of the light scattering and electro-optic response of new material show that these materials can offer new features suitable for large area displays and light valves. 展开更多
关键词 Electro-optic Response Light Scattering Light Valves liquid crystal displays liquid crystal Microdroplets CLC number:TN104.3 Document code:A
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Elimination of Zig-zag Defects in Surface-stabilized Ferroelectric Liquid Crystal Cells
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作者 WANGBin GANChun-Hui 《Semiconductor Photonics and Technology》 CAS 1999年第2期125-128,F003-F004,共6页
The elimination of zig-zag defects in polyimide-coated surface-stabilized ferroelectric liquid crystal(SSFLC) cells is carried out by applying a low-frequency electric field. It has been achieved when the thickness of... The elimination of zig-zag defects in polyimide-coated surface-stabilized ferroelectric liquid crystal(SSFLC) cells is carried out by applying a low-frequency electric field. It has been achieved when the thickness of SSFLC cell is 3 μm. The optical spectral transmittance measurement confirmed that there is no change of layer structure, and the memory capability was not improved. The different effects of low-frequency electric field applied on the different thickness FLC cells have been observed, and experimental results were presented. 展开更多
关键词 liquid crystal Display SSFLC Zig-zag Defects CLC number:TN304.9 Document code:A
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Low voltage transflective blue-phase liquid crystal display with a non-uniform etching substrate
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作者 王健 毛江林 +1 位作者 范昊翔 王琼华 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期127-130,共4页
A transflective polymer-stabilized blue-phase liquid crystal display(BP-LCD) with a non-uniform etching substrate is proposed.In-plane switching(IPS) electrodes on the bottom substrate are put on the different gap... A transflective polymer-stabilized blue-phase liquid crystal display(BP-LCD) with a non-uniform etching substrate is proposed.In-plane switching(IPS) electrodes on the bottom substrate are put on the different gaps,and the bottom substrate between the electrodes is etched into different depths in transmissive(T) and reflective(R) regions.This structure can balance the optical phase retardation in the two regions and is helpful to achieve well-matched voltag-dependent transmittance and reflectance curves.This transflective display has high optical efficiency,a wide viewing angle,and low operating voltage(approximately 6 V). 展开更多
关键词 blue-phase Kerr effect transflective liquid crystal display
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Liquid crystal Fresnel lens display
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作者 王骁乾 Srivastava Abhishek Kumar +4 位作者 谈明威 郑致刚 沈冬 Chigrinov G Vladimir 郭海成 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期88-90,共3页
A novel see-through display with a liquid crystal lens array was proposed.A liquid crystal Fresnel lens display(LCFLD) with a holographic screen was demonstrated.The proposed display system has high efficiency,simpl... A novel see-through display with a liquid crystal lens array was proposed.A liquid crystal Fresnel lens display(LCFLD) with a holographic screen was demonstrated.The proposed display system has high efficiency,simple fabrication,and low manufacturing cost due to the absence of a polarizer and color filter. 展开更多
关键词 see-through display liquid crystal Fresnel lens array holographic screen
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表征TNLCDs光学特性的广义模型
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作者 史建军 史红军 史永基 《光电子技术》 CAS 2002年第4期239-242,共4页
提出了更精确描述 TNLCDs(扭曲向列相液晶显示器 )光学性质的广义模型 ,研究了靠近 LCD边缘分子的光学性质 ,这些分子不能随外加电场扭曲和倾斜 ,理论与实验的透射率符合得很好。
关键词 TNlcds 扭曲向列相液晶 空间光调制器 液晶显示器 可编程光学元件
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基于图像重载模式的O/C老化技术研究
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作者 叶林俊 《电视技术》 2024年第5期161-164,共4页
针对液晶面板(Open/Cell,O/C)可靠度验证的需求,设计了基于图像重载模式加速O/C老化技术方案。由软件控制信号处理板的系统级芯片(System on Chip,So C)内部图形图像产生器,创建输出O/C所需的重载模式老化图像,减少对外部信号产生器的... 针对液晶面板(Open/Cell,O/C)可靠度验证的需求,设计了基于图像重载模式加速O/C老化技术方案。由软件控制信号处理板的系统级芯片(System on Chip,So C)内部图形图像产生器,创建输出O/C所需的重载模式老化图像,减少对外部信号产生器的依赖。通过图像组合、图像播放顺序、图像播放时间等实验设计重载模式老化最优化,实现O/C在整机系统集成商大量生产时进行自动化老化验证测试,提高产品的可靠度。 展开更多
关键词 图像 重载 老化 有机发光二极管(OLED) 液晶显示屏(LCD)
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TFT-LCD及触摸屏玻璃基板激光断切现象研究
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作者 代冬生 《现代制造技术与装备》 2024年第6期22-24,共3页
激光切割技术已经成为玻璃生产及加工领域中的一种成熟的工业加工技术,具备高精度、高速度、高质量、高效率的优点。断切现象是薄膜晶体管液晶显示器(ThinFilmTransistorLiquid CrystalDisplay,TFT-LCD)及触摸屏玻璃基板激光切割的质量... 激光切割技术已经成为玻璃生产及加工领域中的一种成熟的工业加工技术,具备高精度、高速度、高质量、高效率的优点。断切现象是薄膜晶体管液晶显示器(ThinFilmTransistorLiquid CrystalDisplay,TFT-LCD)及触摸屏玻璃基板激光切割的质量问题之一。文章从设备接地、激光器出光功率稳定性、光路和软体系统信号对接4个方面分析短切现象产生的原因,并给出相应的处理方法,以期为常见激光切割质量问题的处理提供参考。 展开更多
关键词 薄膜晶体管液晶显示器(TFT-LCD) 触摸屏 玻璃基板 激光切割 断切
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基于Swin Transformer轻量化的TFT-LCD面板缺陷分类算法 被引量:4
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作者 夏衍 罗晨 +1 位作者 周怡君 贾磊 《光学精密工程》 EI CAS CSCD 北大核心 2023年第22期3357-3370,共14页
在TFT-LCD面板缺陷检测中,检测对象背景复杂、缺陷细微且种类繁多,而工业生产实时性要求高,传统的缺陷分类算法往往难以兼顾精度和速度要求,无法适用于实际生产应用。为均衡TFT-LCD面板缺陷分类的准确率和速率,提出一种基于Swin Transfo... 在TFT-LCD面板缺陷检测中,检测对象背景复杂、缺陷细微且种类繁多,而工业生产实时性要求高,传统的缺陷分类算法往往难以兼顾精度和速度要求,无法适用于实际生产应用。为均衡TFT-LCD面板缺陷分类的准确率和速率,提出一种基于Swin Transformer的轻量化深度学习图像分类模型。首先对模型每层输入的特征图进行Token融合以减少模型计算量,从而提高模型的轻量化水平。其次引入深度可分离卷积模块以帮助模型增加卷积归纳偏置,从而缓解模型对海量数据的依赖问题。最后使用知识蒸馏方法来克服模型轻量化导致的检测精度下降问题。在自制TFT-LCD面板缺陷分类数据集上的实验表明,本文提出的改进模型相比基线模型,FLOPs计算量降低了2.6 G,速度指标提升了17%,而Top-1 Acc精度仅损失1.3%,且与其他图像分类主流模型相比,在自制数据集和公开数据集上都具有更均衡的精度和速度。 展开更多
关键词 TFT-LCD TRANSFORMER 图像分类 计算机视觉
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用于LCD驱动芯片的高精度可调电压产生电路 被引量:2
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作者 杨鑫彪 曾蕙明 +1 位作者 任罗伟 徐晟阳 《半导体技术》 CAS 北大核心 2023年第10期928-934,947,共8页
针对液晶显示器(LCD)芯片中各模块不同的负载与供电需求,同时为了兼容更多同类型LCD驱动控制电路,设计并实现了一种高精度可调电压产生电路。该电路以零温漂基准电压电路为核心,由低压差线性稳压器(LDO)、电荷泵等组成。在温度检测电路... 针对液晶显示器(LCD)芯片中各模块不同的负载与供电需求,同时为了兼容更多同类型LCD驱动控制电路,设计并实现了一种高精度可调电压产生电路。该电路以零温漂基准电压电路为核心,由低压差线性稳压器(LDO)、电荷泵等组成。在温度检测电路与8 bit模数转换器的协同作用下,配合数字模块的设置值得到放大系数,并用于LDO模块得到最终的驱动电压。通过仿真得到,当电源电压(V_(DD))大于1.72 V时,带隙基准电压(V_(ref))可稳定在1.23 V;温度为-20~80℃时,V_(ref)的斜率为±15μV/℃;电荷泵在3.3 V的输入电压下输出电压为19.794 V,满足6倍的升压范围且效率满足既定目标。采用0.18μm CMOS工艺流片并对其进行测试,与仿真结果相比,实测结果存在部分因工艺模型导致的误差,但差值均在±10%的误差许可范围内,表明了此电路的可行性和实用性。 展开更多
关键词 液晶显示器(LCD) 零温漂基准电压 电荷泵 低压差线性稳压器(LDO) 温度检测
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液晶波片在超大尺寸显示器上的仿真
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作者 李玎 杨伟恒 陈辉 《南昌大学学报(工科版)》 CAS 2023年第1期96-102,共7页
超大尺寸显示器被广泛应用于商业显示及高端会议显示,由于偏光片(POL)工艺加工宽幅的限制,业内无法生产出130英寸液晶显示器。为了打破偏光片工艺限制,提出一种130英寸液晶显示器的可行性结构方案,并分别把液晶波片和1/2波片运用在这种... 超大尺寸显示器被广泛应用于商业显示及高端会议显示,由于偏光片(POL)工艺加工宽幅的限制,业内无法生产出130英寸液晶显示器。为了打破偏光片工艺限制,提出一种130英寸液晶显示器的可行性结构方案,并分别把液晶波片和1/2波片运用在这种结构上进行对比分析,发现液晶波片的应用效果优于1/2波片。首先简要介绍了庞加莱球并基于偏振光学原理说明该结构方案的发光机理;然后通过Techwiz LCD 1D仿真软件进行模拟比较分析,发现在正视视角的情况下,液晶波片在130英寸液晶显示器的应用效果会比传统波片更好,其穿透性能基本满足应用需求。相比于目前市面上生产的130英寸LED显示器,该结构方案成本更低,价格优势更明显,是一种可行的技术方案。 展开更多
关键词 液晶显示器 超大尺寸偏光片 液晶波片 Techwiz LCD 1D
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OLED和QD-LCD技术的显示质量与视疲劳影响
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作者 郭正阳 刘超屹 +2 位作者 赵晓莺 安夏 潘长勇 《电视技术》 2023年第8期140-146,共7页
近年来,随着高清显示技术的不断发展,各种显示终端产品被广泛应用,视疲劳发病率显著上升。有机发光二极管(Organic Light Emitting Diode,OLED)和量子点液晶(Quantum Dot Liquid Crystal Display,QD-LCD)是两种各具优势的显示技术。为... 近年来,随着高清显示技术的不断发展,各种显示终端产品被广泛应用,视疲劳发病率显著上升。有机发光二极管(Organic Light Emitting Diode,OLED)和量子点液晶(Quantum Dot Liquid Crystal Display,QD-LCD)是两种各具优势的显示技术。为研究两种显示技术的显示质量及其对视疲劳的影响,采用主客观评价相结合的方式,选取41名被试,利用被试主观评分对比采用OLED技术和QD-LCD技术的显示终端在不同观看任务下的显示质量与对视疲劳的影响。测试结果显示,受试者中的青年人与近视患者观看LCD电视后的眼疲劳感较观看OLED电视强,其余测试项结果无显著差异。 展开更多
关键词 有机发光二极管(OLED) 量子点液晶(QD-LCD) 显示质量 视疲劳 主观评价
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基于FPGA的超高亮液晶显示动态调光系统的设计
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作者 赵仁习 陈文明 +1 位作者 王珊 王再见 《光电技术应用》 2023年第2期62-69,共8页
针对在超高亮环境下,液晶显示的功耗大、散热高、画面对比度低的问题,设计一种基于FPGA的动态背光系统。基于vesa标准的分区亮度提取与分帧加权背光驱动数据处理,通过FPGA对背光灯板的驱动IC的控制,实现对每个微小型区域背光进行单独控... 针对在超高亮环境下,液晶显示的功耗大、散热高、画面对比度低的问题,设计一种基于FPGA的动态背光系统。基于vesa标准的分区亮度提取与分帧加权背光驱动数据处理,通过FPGA对背光灯板的驱动IC的控制,实现对每个微小型区域背光进行单独控制。实现了在高亮环境下,采用动态区域调光算法的背光灯板与传统全局背光灯板相比,相同功耗下对比度提高了35.8%,有效的提高了画面的显示质量;同时,在达到相同亮度的情况下,功耗降低了50%左右。有效地解决了因全局背光带来的功耗高、对比度低问题,实现了背光亮度可根据液晶画面灵活调整,达到了降低功耗同时提升画面的显示效果。 展开更多
关键词 超高亮 液晶显示 小区域动态调光 FPGA 背光驱动
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智能直流电机PWM调速控制系统 被引量:3
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作者 史旭丹 《中国高新科技》 2023年第4期20-22,共3页
随着工业的发展,机械设备几乎无处不在,对生产速度和生产工艺的要求也越来越高。这就需要提高机械的运转速度,以保证人们对生产速度与质量的要求。文章选择智能直流电机PWM调速系统作为毕业设计课题,通过学习模拟出现今各种机械的直流PW... 随着工业的发展,机械设备几乎无处不在,对生产速度和生产工艺的要求也越来越高。这就需要提高机械的运转速度,以保证人们对生产速度与质量的要求。文章选择智能直流电机PWM调速系统作为毕业设计课题,通过学习模拟出现今各种机械的直流PWM调速系统。 展开更多
关键词 霍尔传感器测速识别 LCD液晶显示数据 直流电机转速调节
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