透射型蓝相液晶显示器件光电特性的优化

论文总字数：24746字

摘 要

蓝相是液晶中具有特殊性质的一个相态。具有特殊的扭曲双螺旋结构且相态稳定。对于显示器件而言，蓝相液晶具有优异的电光特性。其亚毫秒的响应时间不但使液晶显示器有可能实现场序彩色显示模式，还可以大大降低动态伪像，而场序彩色显示模式显示器的分辨率和光学效率是常规的3 倍；由于其组装结构不需要定向层，可以大大简化制造工艺过程；在无电场时，在光学上是各向同性的，具有完美的黑态，所以视角大，并且非常对称；只要液晶盒的厚度大于一定值，其透过率对液晶盒的厚度就不敏感，所以特别适于制作大显示屏。自然状态下的蓝相液晶的存在的温度范围极窄（1~2°C），随着聚合物稳定蓝相液晶的发现，温度范围已经拓宽到60°C以上，但是仍然存在着工作电压太高，稳定性差，透过率不够，磁滞效应等问题。

本文首先详细介绍了蓝相液晶的背景与蓝相液晶分子的结构特征，简述了蓝相液晶的工作原理，介绍了蓝相液晶主要的两种电极结构IPS型与VFS型电极结构。通过理论分析了普通IPS型电极结构的电极参数、盒厚，墙型电极结构电极的凸起高度对光电特性的影响并通过液晶显示模拟软件TECHWIZ LCD进行验证，最终得出结论。

关键词：蓝相液晶 光电特性优化 电极结构优化

Abstract

The blue phase is a phase state with special properties in liquid crystal and has special twisted double helix structure and it's phase state is stable. For the display device, the blue phase liquid crystal has excellent electro-optical properties. It's sub-millisecond response time not only let the liquid crystal display device has the potential to realize the field sequential color display mode but also greatly reduce the dynamic pseudo image, and the resolution and optical efficiency of the field sequential color display model display is 3 times that of the conventional display mode. Because it's assembly structure doesn't need the orientation layer, the manufacturing process can be greatly simplified. When there is no electric field , it is isotropic in optics and with perfect dark state, so the angle of view is large and it is very symmetric. As long as the thickness of the liquid crystal cell increase to a certain value, it's transmission rate will be not sensitive to the thickness of the liquid crystal cell, therefore, it is particularly suitable for the production of large display. In the natural state, the blue phase liquid crystals are often observed in a very narrow temperature range (1~2 °C), with the discovery of polymer stabilized blue phase liquid crystal, the temperature range has been widened to more than 60°C, but there are still problems such as working voltage is too high, stability is poor, transmission rate is not enough, hysteresis effect and so on.

In this paper, first we introduce the structure characteristics of liquid crystal and polymer blue phase liquid crystal in detail and describe the working principle of blue phase liquid crystal briefly and introduce two main types structure IPS and VFS of the blue phase liquid crystal.Then we analyzed the influence of the electrode parameters and cell thickness of IPS electrode structure and electrode height of wall-shape electrode structure to photoelectric properties theoretically. Finally verify them through the liquid crystal display simulation software TECHWIZ LCD and come to the conclusion.

Keywords:Blue phase liquid crystal, Optimization of optoelectronic properties, Electrode structure optimization.

目 录

摘要 I

Abstract II

第一章 绪论 1

1.1 蓝相液晶1

1.1.1 什么是蓝相液晶 2

1.1.2 蓝相液晶的发现 2

1.1.3 蓝相液晶的结构 3

1.2 蓝相液晶的克尔效应4

1.3 蓝相液晶显示器6

1.3.1 IPS电极结构蓝相液晶显示器 7

1.3.2 VFS电极结构蓝相液晶显示器 8

1.4 本文主要研究内容及意义 9

第二章 普通IPS型蓝相液晶显示器的优化10

2.1电极宽度w对光电特性的影响 10

2.2电极间距l对光电特性的影响12

2.3盒厚d对光电特性的影响14

2.4本章小结15

第三章 墙型电极结构的优化 17

3.1 墙型电极结构 17

3.2 凸起高度对光电特性的影响 19

3.3本章小结20

第四章 总结与展望 21

4.1 总结21

致谢 22

参考文献 23

第一章 绪论

1.1 蓝相液晶

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