共查询到19条相似文献,搜索用时 187 毫秒
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采用反应性液晶通过光聚合反应与聚芳醚光取向膜复合方法,制备了平面转换(In-plane switching,IPS)液晶显示器件,并在高温状态下对其光电显示和取向稳定性能进行了研究。结果显示,与单一聚芳醚光取向膜相比,利用复合光取向膜制备的IPS器件在高温状态下的光电显示和液晶取向稳定性能都得到了明显提高,在65℃明亮显示20h无液晶取向变化,在120℃维持2h无明显光量渗透。在线偏振紫外光下,光敏聚芳醚薄膜发生各向异性光交联反应,其交联程度最高可达67.4%。SEM分析结果发现,反应性液晶单体在UV光照射下,在聚芳醚光取向膜表面上发生了各向异性光聚合反应,沿先前光取向方向形成长度为0.4μm左右的棒状聚合物,有效限制了光取向膜中未交联的柔性基团的活动能力,进而有效增强了复合取向膜对液晶的取向稳定性。 相似文献
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日本姬路工大的川月喜弘等研究人员对光敏侧链型高分子液晶的光控取向进行了研究,通过使光敏性良好的β-(2-呋喃基丙烯)基与甲基丙烯系液晶聚合物支链端相结合,力图使光照能量大幅度降低,同时还研究了将烷基丙烯酸酯共聚制膜后,经偏振紫外光照射时,对液晶预倾角及耐热性方面所产生的影响,实验结果表明,具有β-(2-呋喃基丙烯)基的聚合物[Poly(MHFEB)]膜面只用以往具有苯乙烯基聚合物[Poly(MHCEB)]膜面的1/30光照射能量即可实现液晶取向功能,且聚倾角不依赖光能量的变化而变化,而依赖于侧链基成份含量而变化,此外,还显示出高耐热性。 相似文献
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介绍用线性偏振光聚合法制备肉桂酸聚乙烯醇酯类液晶取向膜,用偏振红外光谱研究LPP膜的各向异性和取向能力,以及其与光照时间的关系。并提出,用两片不同的LPP取向膜能制备具有较在预倾角的液晶盒。 相似文献
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Anisotropic thermal conductivity of nanoporous silica film 总被引:1,自引:0,他引:1
In this paper, thermal conductivity of porous silica film with porosity from 21 to 64% was studied comprehensively. The corresponded dielectric constant is from 2.5 to 1.5. It is observed that the porous silica material has strong anisotropic characteristic. A serial-parallel hybrid model is proposed to explain the correlation between porosity and thermal conductivity in both in-plane and cross-plane components. The pores in the higher porosity silica film tend to distribute horizontally. This distribution of the pores in the dielectric film is the main factor that induces the anisotropic characteristic. The nonuniform distribution of pores also makes the conventional two-dimensional model of 3u/spl grave/ method inappropriate for extracting the in-plane thermal conductivity. A new method based on the hybrid model was proposed to extract the in-plane thermal conductivity successfully. The anisotropic characteristic of the thermal conductivity may be accompanied by the anisotropic dielectric constant, which will greatly complicate the thermal management and resistance-capacitance delay simulation of the circuits and should be avoided. The proposed model would be helpful on evaluation of new porous low dielectric constant materials. 相似文献
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The quenching of stimulated emission from organic dye solutions has previously been attributed to optical absorption by dye molecules in the metastable triplet state. By comparing the critical inversion expected for a dye laser with no triplet losses to that obtained from an analysis of the laser that includes the triplet-state loss, the magnitude of the optical loss due to the triplet state can be determined in terms of the absorption and emission spectra, fluorescence decay time, quantum yield, and laser wavelength for a given dye. Measurements of the critical inversion and triplet-state concentration for a flashlamp-excited laser are presented for the xanthene dyes acridine red, fluorescein disodium salt, rhodamine B, and rhodamine 6G. Experiments with 7-hydroxycoumarin were also performed but, due to lack of triplet-state absorption data, the triplet-state concentration could not be determined. It is possible from the measurements to conclude that triplet-state absorption is important in 7-hydroxycoumarin. The critical inversion is found to be approximately 1015cm-3for the xanthenes. This value is, in all cases, many times larger than the critical inversion calculated in the absence of triplet losses. 相似文献
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Yi-Hsin Lin Hongwen Ren Gauza S. Yung-Hsun Wu Yue Zhao Jiyu Fang Wu S.-T. 《Display Technology, Journal of》2006,2(1):21-25
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. 相似文献
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提出了一种新颖的基于三维掩膜的硅各向异性腐蚀工艺,即利用深反应离子刻蚀、湿法腐蚀等常规体硅刻蚀工艺和氧化、化学气相沉积(CVD)等薄膜工艺制作出具有三维结构的氧化硅(SiO2)或氮化硅(Si3N4)薄膜,以该三维薄膜作为掩膜进行各向异性腐蚀,该工艺可以应用于MEMS微悬空结构的制作。利用该工艺成功地在单片n-Si(100)衬底上完成了一种十字梁结构的释放,并对腐蚀的过程和工艺参数进行了研究。 相似文献
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Kwang-Lung Lin Ya-Te Liu 《Advanced Packaging, IEEE Transactions on》1999,22(4):580-585
This study investigated the feasibility of the multilayer Cu/Ta/Cu under bump metallurgy (UBM), deposited on AlN/Si where AlN is a thin film. An interdiffusion study found that Ta is an appropriate diffusion barrier layer for the investigated solder bump structure. The temperature profiles and the flux compositions for solder reflow were also investigated. The flux activators investigated include succinic acid, adipic acid, stearic acid, dimethylamine hydrochloride, and diethylamine hydrochloride. Among these, succinic acid was the most appropriate in terms of wetting and cleaning 相似文献
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为了形象演示"集成电路工艺原理"课程中的各向异性湿法腐蚀,笔者指导学生设计了一组(100)硅片上以SiO2正方薄膜为掩膜的腐蚀实验。学生自主配置KOH了溶液,改变水浴温度进行各向异性腐蚀实验,并利用金相显微镜对样品实时观察并测量。学生在动手过程中可以理解各向异性相关工艺,加强了教学效果。 相似文献
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Advanced integrated circuit packaging processes require good bondability and reliability between various mating surfaces.
A key factor affecting this requirement is surface cleanliness. Plasma cleaning is the most suitable process for optimum surface
cleanliness. An investigation of O2, Ar, and O2/SF6 plasma cleaning was carried out on a flexible substrate to study the adhesion of anisotropic conductive adhesive film for
flip chip bonding. Surface roughness was found to increase substantially after the plasma treatment. Adhesion strength was
evaluated by 90° peeling tests both for untreated and plasma-treated flex. A higher adhesion strength of anisotropic conductive
film (ACF) bond was observed after plasma cleaning. The surface morphology of plasma treated and untreated flex substrate
before bonding, as well as the fracture surfaces after the peel test for both cases, was characterized by secondary electron
image techniques of scanning electron microscopy (SEM). Based on the detailed SEM findings, extensive comparisons were made
between the plasma treated and the untreated samples. Mechanical interlocking is found to be responsible for higher peel strength
of the plasma treated flex bonding. It was also proposed to select the right flexible substrate for highly reliable, ACF bonded
flip chip on flex substrate. 相似文献
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Yi-Hsin Lin Hongwen Ren Sebastian Gauza Yung-Hsun Wu Yue Zhao Jiyu Fang Shin-Tson Wu 夏明哲 《现代显示》2006,30(10):7-12
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。 相似文献