基于相变材料的固态光学显示器的研究
发布时间：2018-08-02 17:05
【摘要】：固态非易失性光学涂层显示结构(Solid-state Non-volatile Optical Coatings Display)是基于光学涂层和相变材料这两种技术的结合发展而来的一项新型动态显示技术。通过热累积,相变材料可以在晶态和非晶态两种相态之间进行快速可逆的转变,并伴随有材料电学和光学特性的剧烈改变,因此被广泛应用在光学器件、光学存储、电学存储器件中。另一方面,光学涂层则是基于薄膜干涉现象实现的薄膜器件,通过调节膜层厚度对特定光波段的反射和吸收进行调控。结合以上两种技术,超薄的强吸收材料和光学反射面结合形成的光学涂层,再利用相变材料相态可变的特性,可以实现多种明亮色彩的动态切换显示。在这项新型技术中,整个显示结构的颜色变化可以通过改变相变材料Ge_2Sb_2Te_5(GST)的相态来实现,而相态的变化可以由位于相变材料上下的两层导电材料氧化铟锡(ITO)通电流来实现电致相变。凭借相变材料的其他特点,这种显示结构还具有非易失性(即掉电后显示内容仍然保持)、显示功耗低、显示内容切换高速、柔性兼容性好、不依赖于衬底材料、可实现大面积显示器、制造工艺简单等诸多优点,在新型显示领域具有广泛的应用前景。本文初步研究了 ITO材料的热致晶化现象和其与反射面结合的薄膜干涉效应,并深入研究了在基于相变材料设计的固态显示结构中,相变材料GST和导电材料ITO这两层材料各自所起到的作用。本课题发现了 ITO的晶化和GST的相态变化都对整个结构的颜色改变有重要的影响,这是在此前的研究中从未报道的内容。实验发现,在本文研究的显示结构中,ITO甚至比GST对显示颜色的改变更重要。·本研究同时也进行了仿真光学涂层结构颜色的相关工作,利用材料固有的光学性质参数,计算模拟得到多层薄膜的显示颜色。基于以上实验结果和仿真结果,本研究发展出了 一种同时利用GST和ITO特性,使显示性能更优化的新型显示器结构。本研究还初步探索了利用相变材料的多级相变,实现光学涂层颜色的连续显示和更精细的调控。
[Abstract]:Solid state nonvolatile optical coating display structure (Solid-state Non-volatile Optical Coatings Display) is a new dynamic display technology based on the combination of optical coating and phase change materials. By thermal accumulation, phase change materials can change rapidly and inversely between crystalline and amorphous phase states, accompanied by drastic changes in electrical and optical properties of materials, so they are widely used in optical devices and optical storage. In electrical memory devices. On the other hand, optical coating is a kind of thin film device based on the phenomenon of thin film interferometry, which regulates the reflection and absorption of a specific wavelength by adjusting the thickness of the film. Combined with the above two techniques, the optical coating formed by the combination of ultra-thin strong absorption materials and optical reflectors, and the variable phase state of phase change materials, can realize the dynamic switching display of various bright colors. In this new technique, the color change of the whole display structure can be achieved by changing the phase state of the phase change material (Ge_2Sb_2Te_5 (GST). The change of phase state can be realized by the current of indium tin oxide (ITO) in the two layers of conductive material above and below the phase change material. By virtue of other characteristics of the phase change material, the display structure is also non-volatile (that is, the display content remains after power off), the display power consumption is low, the display content is switched high speed, the flexibility compatibility is good, does not depend on the substrate material, It has many advantages, such as large area display, simple manufacturing process and so on. It has a wide application prospect in the new display field. In this paper, the thermally induced crystallization of ITO materials and the film interference effect combined with the reflectors are studied, and the solid state display structure based on the phase-change materials is studied in detail. Phase change material (GST) and conductive material (ITO) play their respective roles. It is found that both the crystallization of ITO and the phase change of GST have important effects on the color change of the whole structure, which has never been reported in previous studies. It is found that in the display structure studied in this paper, the change of color is even more important than that of GST. At the same time, the related work of simulating the color of optical coating structure is also carried out, and the intrinsic optical properties of the material are used. The display color of the multilayer film is obtained by computer simulation. Based on the above experimental results and simulation results, a new display structure is developed, which utilizes the characteristics of GST and ITO at the same time and optimizes the display performance. In this study, the multistage phase transition of the phase change material is used to realize the continuous display of the color of the optical coating and the finer control.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN873
本文编号：2160098
[Abstract]:Solid state nonvolatile optical coating display structure (Solid-state Non-volatile Optical Coatings Display) is a new dynamic display technology based on the combination of optical coating and phase change materials. By thermal accumulation, phase change materials can change rapidly and inversely between crystalline and amorphous phase states, accompanied by drastic changes in electrical and optical properties of materials, so they are widely used in optical devices and optical storage. In electrical memory devices. On the other hand, optical coating is a kind of thin film device based on the phenomenon of thin film interferometry, which regulates the reflection and absorption of a specific wavelength by adjusting the thickness of the film. Combined with the above two techniques, the optical coating formed by the combination of ultra-thin strong absorption materials and optical reflectors, and the variable phase state of phase change materials, can realize the dynamic switching display of various bright colors. In this new technique, the color change of the whole display structure can be achieved by changing the phase state of the phase change material (Ge_2Sb_2Te_5 (GST). The change of phase state can be realized by the current of indium tin oxide (ITO) in the two layers of conductive material above and below the phase change material. By virtue of other characteristics of the phase change material, the display structure is also non-volatile (that is, the display content remains after power off), the display power consumption is low, the display content is switched high speed, the flexibility compatibility is good, does not depend on the substrate material, It has many advantages, such as large area display, simple manufacturing process and so on. It has a wide application prospect in the new display field. In this paper, the thermally induced crystallization of ITO materials and the film interference effect combined with the reflectors are studied, and the solid state display structure based on the phase-change materials is studied in detail. Phase change material (GST) and conductive material (ITO) play their respective roles. It is found that both the crystallization of ITO and the phase change of GST have important effects on the color change of the whole structure, which has never been reported in previous studies. It is found that in the display structure studied in this paper, the change of color is even more important than that of GST. At the same time, the related work of simulating the color of optical coating structure is also carried out, and the intrinsic optical properties of the material are used. The display color of the multilayer film is obtained by computer simulation. Based on the above experimental results and simulation results, a new display structure is developed, which utilizes the characteristics of GST and ITO at the same time and optimizes the display performance. In this study, the multistage phase transition of the phase change material is used to realize the continuous display of the color of the optical coating and the finer control.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN873
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