单玻璃基板与各向异性聚合物膜的IPS-LCD的应用

介绍了一种使用单片玻璃基板和各向异性聚合物膜的轻型、共面转换液晶显示(IPS-LCD)技术。液晶分子由伸长的聚合物膜内的颗粒排列。各向异性聚合物膜的取向性能与聚酰亚胺(PI)摩擦层相当。良好的液晶取向性能使新器件的对比度(514:1)、驱动电压和响应时间都能够与双玻璃基板LCD相比拟。这种各向异性膜也能作为拓宽视角的相位补偿膜来使用。该技术特别引人注目之处在于制作单基板显示器,同时它也具有实现双层宾主显示和IPS-LCD柔性显示的潜在应用。     

光敏自组装单层膜用于液晶光控取向的研究

用丁二酸酐和7-羟基香豆素合成了含有脂肪族羧酸基团的光敏化合物，利用脱水反应使它在玻璃(或石英)基板表面形成自组装单层膜。用偏振紫外光照射光敏性自组装膜，与光矢量方向匹配的香豆素基团发生[2 2]周环反应，反应产物沿辐照光的偏振方向分布，形成表面张力各向异性的薄膜。用它作为向列相液晶取向膜制成平行液晶器件，在偏光显微镜下观察，发现取得了均一、稳定的取向效果。并且该取向膜有良好的热稳定性。     

一种共价键结构的高稳定性自组装光控取向膜

通过两次光照法制备了一种基于共价键结构的自组装光控取向膜。首先采用重氮树脂与聚(4-丙烯酰氧基肉桂酸(4′-磺酸钠)苯酚酯)在水溶液状态下通过静电离子沉积法制备了layer-by-layer型的自组装多层膜,制备过程的紫外-可见光谱表明薄膜为逐层、均匀沉积。第一次光照将膜层间的重氮磺酸盐离子键转化为共价键结构,然后采用线性偏振紫外光进行第二次光照,获得具有各向异性的光控取向膜。紫外-可见光谱法证实了薄膜辐照过程中的光化学反应方式。这种液晶光控取向膜可以水平均匀取向向列相液晶,而且具有良好的热稳定性,可达到150℃。     

一种基于自组装共价单层成膜方式的新型铁电液晶光控取向膜

提出了一种基于自组装技术的新型光敏材料作为FLC的取向层的新方案,它为在分子尺寸上研究和控制FLC与固态基板之间的相互作用提供了新的途径.光敏材料是通过共价键作用与基板相连接的.线性偏振紫外光的辐照后,即得到了光学各向异性的自组装膜;以该膜作为取向膜能够很好地取向FLC,且所制备的器件的静态对比度可以达到350.其效果已经可以与传统的摩擦聚酰亚胺类薄膜相媲美.     

氧化铍基板厚膜多层电路工艺研究

氧化铍基板在大功率电路领域广泛应用。本文对氧化铝基板用厚膜多层浆料体系在氧化铍基板上的匹配性进行研究。重点对导体的附着力、焊接性能进行了对比实验。研究结果显示氧化铝基板用厚膜多层浆料体系适用于氧化铍基板上。     

各向异性PDLC散射膜的特性研究

采用摩擦表面取向层的方法制备了有光学各向异性结构的ＰＤＬＣ膜。研究了液晶盒的厚度、摩擦强度,以及在紫外光诱导相分离过程中的光照强度对ＰＤＬＣ膜的光学各向异性程度和电光特性的影响。对ＰＤＬＣ的光学各向异性进行了研究,并给出了要获得低阈值电压、高各向异性的聚合物分散液晶各向异性膜的盒厚、摩擦强度以及光照度等条件。被取向后的ＰＤＬＣ各向异性膜可被用来作为具有很好光电特性的电可调散射式偏振片。     

一种新型液晶垂直取向膜

采用离子沉积法在玻璃基板表面制备了十四烷基磺酸盐自组装膜,用带有该自组装膜的基板制成的液晶器件呈现出垂直取向效果。通过自组装反应过程分析,认为自组装膜表面的纵向沟纹引起了液晶的垂直排列。实验发现,当自组装膜烷烃碳链长度大于11个C原子就可获得垂直取向。这种取向膜制作过程简单、热稳定性好,非常有望应用于多畴垂直取向模式的液晶显示器。     

低成本银基厚膜多层基板的研制

介绍低成本银基厚膜多层基板的材料系统，工艺流程，工艺特性以及基板的性能。     

自组装法制备新型液晶垂直取向膜

用硅烷偶联剂3-氨丙基-三乙氧基硅烷,通过自组装反应在石英基板表面制备了含有二苯乙炔基的自组装单层膜。用该自组装膜作为向列相液晶的取向层制成液晶器件,在偏光显微镜下观察,发现向列相液晶获得了均匀、稳定的垂直取向效果。热稳定性试验表明,用自组装方法制备的液晶垂直取向膜有良好的热稳定性,在250℃条件下取向仍可保持。     

磁控溅射方法制备(CoCr/Pt)20纳米多层膜及表征

采用磁控溅射方法制备了性能优良的以Pt为缓冲层的(CoCr/Pt)20纳米多层膜,研究了溅射气压对(CoCr/Pt)20纳米多层膜的微结构和磁性的影响. 结果表明，Ar溅射气压对(CoCr/Pt)20纳米多层膜的微结构、垂直磁各向异性和矫顽力有很大的影响. 所有样品的有效各向异性常数Keff＞0，具有垂直磁各向异性. X射线衍射结果显示，小角衍射峰很锐，样品有良好的周期性层状结构. 随着Ar溅射气压增加，样品垂直膜面的矫顽力增加,但样品有效磁各向异性常数减小. 原子力显微镜照片显示，随着Ar溅射气压增加，其表面平均晶粒尺寸和粗糙度均增加，这是导致多层膜的垂直矫顽力增加和有效磁各向异性常数减小的因素.     

IPS-LCD using a glass substrate and an anisotropic polymer film

A lightweight in-plane-switching liquid crystal display (IPS-LCD) using a single glass substrate and an anisotropic polymeric film is demonstrated. The liquid crystal molecules are aligned by the elongated polymer grain of the film. The alignment capability of the anisotropic film is comparable to a buffed polyimide layer. Compared to the LCD using two glass substrates, our new device exhibits a comparable contrast ratio (/spl sim/514:1), driving voltage, and response time because of good LC alignment. Such an anisotropic film can also function as a phase compensation film for widening the viewing angle. This technology is particularly attractive for making single-substrate displays and also has potential for a double-layered guest-host display and a flexible display using IPS LCDs.     

Anisotropic Change of Liquid‐Crystal Domains by Polarized Infrared Pulse Laser Irradiation for a Columnar Mesophase

The infrared photoinduced alignment change of liquid‐crystal domains was investigated for a hexagonal columnar mesophase of a liquid‐crystalline triphenylene derivative. A uniform and anisotropic alignment change of domains was observed when a polarized infrared (IR) light corresponding to the wavelength of the aromatic C–C stretching absorption band of the triphenylene core was used to irradiate the sample. The relationship between the aligned azimuthal angle of the columnar axis and the polarization of the IR incident irradiation was investigated. IR absorption dichroism is induced as a result of the reorientation of triphenylene core. Texture observation and polarizing microscope FTIR spectra show that a change of the molecular alignment occurred and that the direction of columns depends on the polarization angle of the IR light used for irradiation. The mechanism of the alignment change in a columnar liquid crystal film by IR irradiation is also discussed. The technique could provide a novel technology to control the columnar alignment of highly viscous liquid crystals.     

Core–Shell Colloids and Hollow Polyelectrolyte Capsules Based on Diazoresins

Hollow polyelectrolyte microcapsules containing diazoresins (DZR) were fabricated by the layer‐by‐layer self‐assembly of a polycation, DZR, in alternation with poly(styrenesulfonate) (PSS) onto polystyrene (PS) particles, followed by dissolution of the PS core by tetrahydrofuran (THF). The multilayer film buildup on the colloids was observed by UV‐visible spectroscopy, single particle light scattering (SPLS), and transmission electron microscopy (TEM). The data confirmed regular and stepwise layer formation of DZR and PSS on the colloid particles, with a thickness of about 10 nm for each DZR/PSS bilayer when exposed to aqueous solution, and approximately 5 nm in the “dry state”. The photosensitive nature of the DZR layers was exploited to construct highly stable, covalently attached (polymerized) films by exposure of the ionic self‐assembled DZR/PSS multilayer films to UV‐irradiation. TEM and atomic force microscopy (AFM) confirmed the formation of hollow DZR/PSS multilayer capsules. Osmotic pressure experiments followed by confocal laser scanning microscopy revealed a high mechanical stability of the hollow DZR/PSS capsules. The mechanically robust polymerized multilayer films on the colloids and as free‐standing three‐dimensional hollow capsules are more stable in various chemical environments (i.e., resistant to etching by solvents) than their ionically linked counterparts.     

The wide view (WV) film for enhancing the field of view of LCDs

This paper reviews the technologies of the wide view (WV) film. The WV film is an optical compensation film, which remarkably enhances the field of view of twisted nematic (TN) thin-film transistor liquid crystal displays (TFT-LCDs). We have recently developed a new WV film for the OCB mode, which promises a fast optical response speed and wide viewing angle LCD-TV. The WV film is made of a hybrid alignment polymerized discotic material (PDM) layer coated on a (tri-acetyl cellulose (TAC) substrate. The PDM layer alignment technology and the TAC retardation control technology give us the flexibility to develop a compensation film for any LCD mode and allow a cost effective roll-to-roll polarizer lamination process.     

用偏光显微镜解析界面层分子有序度

阐述了用偏光显微镜测量液晶盒中分子有序度分布的方法。采用楔形液盒获得了仅有十几个ｎｍ的界面层信息,并提出具有创意性的偏光解析方法。通过这一工作得出以下结论：在高分子膜表面通过摩擦过程获得的液晶取向排列,其界面子有序度为体内部序度的６０％以下,有序度远低于体内部;由于固体界面对液晶排列的影响,产生一个有序度连续变化的界面层,其厚度大约于体内部;由于固体界面对液晶排列的影响,产生一个有序度连续变化的界     

不同调制周期Cu/TaN多层膜的微结构与表面形貌

采用磁控溅射方法在Si(111)基底上沉积不同调制周期的Cu/TaN多层膜,用X射线衍射仪(XRD)与原子力显微镜(AFM)表征薄膜微结构与表面形貌,研究了不同调制周期L薄膜的微结构与表面形貌.结果表明:不同L的TaN调制层均为非晶结构,多晶Cu调制层的晶粒取向组成随着L改变而变化; Cu调制层的表面粗糙度Rrms.大于TaN调制层的Rrms;与Cu单层膜相比,最外层为Cu调制层的Cu/TaN多层膜的Rrms较小;与TaN单层膜相比,最外层为TaN调制层的Cu/TaN多层膜的/Rrms较大;随着L增加,多层膜与对应的单层膜之间的兄Rrms差值逐渐减小.