【作者】 荆海；

【导师】 黄锡珉； 宣丽；

【作者基本信息】 中国科学院长春光学精密机械与物理研究所 ， 凝聚态物理， 2000， 博士

【摘要】 液晶显示视角问题是评价显示品质的关键问题。共面转换液晶显示（IPSLC）模式可以很好的解决视角问题，但它存在高阈值电压、色移现象、响应速度慢问题等。本文将就这些问题进行研究与探讨。 IPS模式的驱动电压高，使得共面转换模式功耗升高，难以和TFT相匹配。本文采用弱锚定模型，从连续体弹性形变理论出发，应用变分原理，推导出不对称锚定下共面转换模式的Freedericks转变的阈值解析表达式，并分析了不对称弱锚定对阈值电压的影响。表明不对称弱锚定IPS模式是降低阈值电压新途径，并证明此模型符合实验结果。 为了解决普通IPS模式存在的色移现象，本文从机理上对色移现象进行了分析，首次提出了单面摩擦扭曲排列IPS模式和圆弧状交错电极模式，使得色移问题得到很好的解决，克服了易击穿问题和向错缺陷。 本文对IPS模式的动力学模型进行了理论分析，通过引入一定百分比浓度的液晶聚合物，在紫外光处理条件下形成聚合物网络，利用聚合物网络对液晶的锚定作用，使得IPS液晶显示器件的下降响应时间得到极大改善。本文还采用新型的双面电极IPS模式，得到理论推导和实际器件相一致的快速响应结果。 TFT-IPS电极设计和存储电容设计对于器件的驱动电压和开口率有很大影响，本文从降低器件的驱动电压和扩大开口率的角度出发，对TFT-IPS电极设计进行优化设计，并设计了新型存储电容，使得开口率提高了22％。同时就IPS-TFT器件一些材料参数和器件参数进行了设计，四分割IPSLCD开口率为45％，l/d值为3.75。更多还原

【Abstract】 Liquid Crystal Display (LCDs) has been currently the dominant technique in the flat panel display (FPDs), for its availability for high resolution, full color and vedio graphic. However, its display performance needs further improving in several aspects, and among them its well-known narrow viewing angle is one of the most serious problems. The In-Plane-Switching (IPS) model has been recently proposed and believed to be one of the most promising method, but IPS model has some defects, such as high threshold voltage, shift color, slowly response time and low aperture ratio. This thesis will concentrate it study in the optimized design of the model and device aiming to improve the parameters as described above.The threshold voltage of common IPSLCD is very high, leading to higher power consumption and a more critical requirement for the thin film transistor (TFT). From the concept of asymmetric anchoring in this thesis, the asymmetric anchoring case were considered basing on elastic continuum theory of liquid crystal and using variational method. The analytical expressions of Freederick’s transition threshold for IPS model were deduced. The effect of asymmetric weak anchoring to threshold voltage of IPSLCD were analyzed, the result expresses that the asymmetric weak anchoring can decrease the threshold voltage of IPSLCD.The color shift phenomenon is a serious drawback in IPSLCD model, the producing mechanism of color shift were analyzed in thesis, the One-Side-Rubbing Nematic-Twist IPS model and Arc-Electrode IPS model were proposed to suppress the color shift.We utilized the LC continuum theory and dynamics theory to analysis In-Plane-Switching liquid crystal model response time, and the monomer in liquid crystal can polymerize to form network by curing the UV light, the anchoring of polymer network can improve the fall response time of IPS model. A novel Two-Side-’ Electrode IPS model were proposed in this thesis and we got the result that the fallresponse time was nearly to rise response time from the theory to the sample.The Cross-Talk problem of big capacity IPSLCD is same to TNLCD, the TFT method is a effective way to solve this problem, but the design of electrode and store capacity affected the aperture ratio and threshold voltage. In order to decreasing the threshold voltage and expanding the aperture ratio, we design the TFT-IPS electrode and novel store capacity, the liquid crystal parameter and device parameter were designed at the same time.更多还原