柔性显示材料在力学和温湿环境中的失效研究
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摘要
显示技术的发展使得传统显示器面临各种挑战,而对于各种个性应用的需求使柔性显示材料日渐成为不可避免的趋势。本文的研究内容是对于目前集成了先进制造技术的两种新型柔性显示材料:柔性PNLCD和柔性STN-LCD进行基于力学和温湿环境下的失效研究。通过模拟实际的使用环境来找到产品在实际使用中可能发生的问题和缺陷,并对这两种新型柔性显示材料在环境试验和力学试验中发生的失效模式进行深入的分析和研究,了解其在温湿和力学环境下的贮存和使用的适应性。并通过失效分析,对新型柔性显示材料的研制和改进提供试验方面的数据储备。
本文首先详细介绍了作为柔性显示材料基础的液晶显示原理。并介绍了PNLCD和STN-LCD的显示特点、性能和电光特性。然后运用失效分析的思路和方法,特别针对这两种柔性液晶材料在性能和显示上的需要改进之处设定了科学经济有效的试验方法。
本文的研究重点在于对柔性PNLCD和柔性STN-LCD进行力学和温湿环境试验以及失效分析。对于柔性PNLCD,进行了低温试验和交变湿热试验,在试验后根据PNLCD的失效情况进行了深入透彻的分析,并测试了试样的电光性能参数。然后还进行了拉伸和弯曲试验,获得了试样的材料参数,为以后的研究工作采集了基础且详实的资料;对于柔性STN-LCD,进行了高温试验、恒定湿热试验、低温试验和交变湿热试验,分析了其失效模式,利用有限元软件进行了仿真热分析,并与试验结果相印证,对有限元分析进行了有益的探索。
本文的试验方法依据权威标准制定,确保了试验结果和数据的科学性和有效性,整个研究分析工作深入透彻,查明了这两种柔性显示材料在力学和环境试验下的失效模式和性能特点。本文的研究成果必将为这两种柔性液晶材料的可靠性和性能提升提供有力的帮助。
The traditional displays now are facing many challenges with the development of display technology. It is an inevitable trend for flexible displays which can fit the different personalized applications. This paper focused on the failure analysis of flexible PNLCD (Polymer Network Liquid Crystal Display) and flexible STN-LCD (Super Twisted Nematic Liquid Crystal Display) based on the mechanic and environmental tests. A solid foundation can be established by research the failure mode during the tests.
At first this paper introduced the principle of liquid crystal display, and showed the characteristics, performance and electro-optical properties of PNLCD and STN-LCD. Then this paper carried out the ideas and methods of failure analysis to plan scientific and effective test methods of the PNLCD and STN-LCD based on the practical needs. This study concentrated on the mechanic and environmental tests and failure analysis of flexible PNLCD and STN-LCD. For flexible PNLCD: cold test and cyclic damp heat test were adopted to find the failure mode and get the electro-optical parameters. Tension test and bending test were carried out to obtain the material parameters like elastic modulus. For flexible STN-LCD, there were four tests include dry heat test , steady state damp heat test, cold test and cyclic damp heat test to acquire parameters. Thermal analysis was performed to verify the tests.
All test methods were made according interrelated criteria which guaranteed the effective of testing data and testing phenomenon. We totally understand the influence of environment test to flexible PNLCD and STN-LCD. The research will play an important role in improving performance to flexible PNLCD and STN-LCD.
本文首先详细介绍了作为柔性显示材料基础的液晶显示原理。并介绍了PNLCD和STN-LCD的显示特点、性能和电光特性。然后运用失效分析的思路和方法,特别针对这两种柔性液晶材料在性能和显示上的需要改进之处设定了科学经济有效的试验方法。
本文的研究重点在于对柔性PNLCD和柔性STN-LCD进行力学和温湿环境试验以及失效分析。对于柔性PNLCD,进行了低温试验和交变湿热试验,在试验后根据PNLCD的失效情况进行了深入透彻的分析,并测试了试样的电光性能参数。然后还进行了拉伸和弯曲试验,获得了试样的材料参数,为以后的研究工作采集了基础且详实的资料;对于柔性STN-LCD,进行了高温试验、恒定湿热试验、低温试验和交变湿热试验,分析了其失效模式,利用有限元软件进行了仿真热分析,并与试验结果相印证,对有限元分析进行了有益的探索。
本文的试验方法依据权威标准制定,确保了试验结果和数据的科学性和有效性,整个研究分析工作深入透彻,查明了这两种柔性显示材料在力学和环境试验下的失效模式和性能特点。本文的研究成果必将为这两种柔性液晶材料的可靠性和性能提升提供有力的帮助。
The traditional displays now are facing many challenges with the development of display technology. It is an inevitable trend for flexible displays which can fit the different personalized applications. This paper focused on the failure analysis of flexible PNLCD (Polymer Network Liquid Crystal Display) and flexible STN-LCD (Super Twisted Nematic Liquid Crystal Display) based on the mechanic and environmental tests. A solid foundation can be established by research the failure mode during the tests.
At first this paper introduced the principle of liquid crystal display, and showed the characteristics, performance and electro-optical properties of PNLCD and STN-LCD. Then this paper carried out the ideas and methods of failure analysis to plan scientific and effective test methods of the PNLCD and STN-LCD based on the practical needs. This study concentrated on the mechanic and environmental tests and failure analysis of flexible PNLCD and STN-LCD. For flexible PNLCD: cold test and cyclic damp heat test were adopted to find the failure mode and get the electro-optical parameters. Tension test and bending test were carried out to obtain the material parameters like elastic modulus. For flexible STN-LCD, there were four tests include dry heat test , steady state damp heat test, cold test and cyclic damp heat test to acquire parameters. Thermal analysis was performed to verify the tests.
All test methods were made according interrelated criteria which guaranteed the effective of testing data and testing phenomenon. We totally understand the influence of environment test to flexible PNLCD and STN-LCD. The research will play an important role in improving performance to flexible PNLCD and STN-LCD.
引文
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[41]张栋,钟培道,陶春虎.失效分析.北京:国防工业出版社, 2004, 405-448
[42]张峥.失效分析思路.理化检验.物理分册, 2005 41(3): 158-161
[43]盐见虹.失效物理基础.北京:科学出版社, 1982, 10-23
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[2]施乐有限公司.转动球显示器.中国专利, CN1196813, 1998-02-26
[3]文尚胜,李爱源,文斐.柔性有机电致发光器件的研究进展.量子电子学报, 2007, 24(6): 663-670
[4]杨定宇,蒋孟衡,杨军.有机电致发光器件的研究进展.材料导报, 2007, 21(11): 38-40
[5]李全友,姚宁,张兵临.有机电致发光的研究进展及展望.真空与低温, 2007, 13(2): 63-71
[6]李帅,任培兵,仲锡军.液晶材料.河北化工, 2008, 31(9): 28-30
[7]汪朝阳.液晶材料.化工时刊, 2002, 11: 25-27
[8]汪菊英,陈超丽,黄春曼.热致液晶聚合物共混改性聚酰胺的研究进展.上海塑料, 2008, 4: 12-17
[9]孔令光,宁平.热致液晶高分子与聚酰胺原位复合的研究进展.化工新型材料, 2008, 36(10): 45-47
[10]高鸿锦,董友梅.液晶与平板显示技术.北京:北京邮电大学出版社, 2007, 60-71
[11]张洁. Mg_2Al LDH分散体系的相行为:液晶相变、胶凝和重力作用的竞争: [博士学位论文].济南:山东大学, 2007
[12]黄子强.液晶显示原理.北京:国防工业出版社, 2006, 8-11
[13]郑敏燕.棒状磁性液晶的合成及性能研究: [博士学位论文].西安:陕西师范大学, 2007
[14]徐晓鹏,底楠.液晶材料的分类、发展和国内应用情况.化工新型材料, 2006, 34(11): 81-83
[15]赵燕,刘骞峰.液晶材料的分类、应用及其发展状况.中国科技信息, 2007, 24: 143-145
[16]沈曼,郭丽丽,刘建军.液晶的研究进展.河北师范大学学报(自然科学版), 2005, 29(2): 154-157
[17]张文志.当前世界液晶材料的进展.科技信息(科学教研), 2007, 19: 46-47
[18]严翔翔,吕银祥.液晶显示材料.化学教育, 2007, 12: 3-5
[19]王家芳,张红东,邱枫.柔性高分子/小分子液晶混合物的自洽场理论.化学学报, 2003 61(8): 1180-1185
[20]宣丽,马凯.液晶光控取向膜材料的研究: [博士学位论文].长春:中国科学院长春光学精密机械与物理研究所, 2001
[21]王学君.液晶显示器视角特性的研究与改进: [硕士学位论文].成都:电子科技大学, 2008
[22]康桂珍,黄子强.液晶盒厚度的反射光谱拟合法测量.液晶与显示, 2007, 22(4): 382-386
[23]张素花.液晶界面物理—弱锚定向列液晶盒的弗雷德里克兹转变: [硕士学位论文].天津:河北工业大学, 2002
[24]王宁.液晶电控双折射特性研究: [硕士学位论文].曲阜:曲阜师范大学, 2002
[25]凌志华. STN-LCD技术的发展.液晶与显示, 2002, 17(4): 233-242
[26]郭建新,吴声,马振.多畴STN-LCD的研究.液晶与显示, 1996, 11(3): 173-180
[27]王庆凯,吴杏华,王殿元.液晶电光效应实验研究.九江学院学报, 2008, 3: 67-69
[28]李新贝,张方辉,牟强.高扭曲向列液晶盒工作特性研究.液晶与显示, 2006, 21(1): 29-33
[29]杨文君.聚合物网络液晶混合材料的研究: [硕士学位论文].成都:电子科技大学, 2003
[30]杨文君,黄子强,夏都灵.液晶中聚合物网络的形貌研究.液晶与显示, 2003, 18(2): 97-100
[31]王晓安,何杰,阎斌.聚合物网络液晶电光性能的研究.液晶与显示, 2007, 22(4): 372-377
[32]王大巍,王刚,季俊峰.薄膜晶体管液晶显示器件的制造、测试与技术发展.北京:机械工业出版社, 2007, 203-208
[33]陈志强.低温多晶硅(LTPS)显示技术.北京:科学出版社, 2006, 273-303
[34]孙智,江利,应鹏展.失效分析—基础与应用.北京:机械工业出版社, 2005, 1-18
[35]钟群鹏,王仁智,陈玉民.我国机电装备失效分析预测预防实践和学术方面的重大进展——失效学体系的形成和发展.全国第三次机电装备失效分析预测预防战略研讨会论文集, 1998, 5-25
[36]张栋.面向21世纪的产品失效学.全国第二届航空装备失效分析会议论文集, 1998, 64-69
[37]钟群鹏.失效分析和预防中的若干疑点、难点和重点.中国科学院力学研究所21世纪力学重大问题研讨班论文集, 1995, 23-29
[38]钟群鹏,张峥,田永江.机械装备失效分析诊断技术.北京航空航天大学学报, 2002, 28(5): 497-502
[39]李鹤林.失效分析的任务、方法及其展望.理化检验.物理分册, 2005, 41(1): 1-6
[40]张栋.“产品失效学”框架.全国第五届航空航天装备失效分析会议论文集, 2006, 1-14
[41]张栋,钟培道,陶春虎.失效分析.北京:国防工业出版社, 2004, 405-448
[42]张峥.失效分析思路.理化检验.物理分册, 2005 41(3): 158-161
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