47寸单短边入光型导光板的设计与优化
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摘要
侧光式背光模组,尤其单短边入光型,可以大幅减少液晶显示器所用光源数目,降低了整体背光模组的功耗,并且为超薄液晶显示器提供了保障,所以将会是近几年的发展潮流。导光板作为侧光式背光系统中重要组件,影响着背光源的光学属性,进一步影响着显示器的画面质量,高性能导光板的研究是整体背光源开发中重要的工作。
本论文就以47寸单短边入光型的导光板展开了工作,整个研究工作是以光学模拟软件LightTools为平台进行的。
首先,我们进行了网点设计工作,是导光板开发中最为复杂的过程,也是影响导光板光学性能的重要因素。第一步,在软件中建立尽量接近于实际的模型,简化各组件光学属性设置以突出其本身的特性,重点分析了网点的光学属性各项参数的影响,其中近镜面反射和漫射属性的比例对整体亮度分布影响不大,只是漫射属性越大近光源处越亮,反之,近镜面发射属性越大远光源处亮度越高；而高斯角度的变化对整体亮度分布影响比较大,角度越大,光越集中在近光源处,反之,角度越小,光更集中在远光源处。第二步,在软件自动优化网点分布得出结果后,进行曲面拟合的工作,调整网点填充率不符合实际的细节,一般在10-15次后效果较好,即不失真也能做到平滑过渡。第三步,制作样品,将仿真结果与试验测试相对照为下一次改善提供依据。我们做的4次样品中第4次效果已经较为理想。
其次,为了得到满足扫描背光所需的长条形光斑,我们对透镜导光板进行了仿真模拟研究,发现在加工工艺允许的范围内,排布越紧密、尺寸越大的半圆形透镜微结构会有最好的光斑效果。
Edge-lit backlight module, especially single-short-edge-lit type, can significantly reduce the number of light sources used in liquid crystal displays and the power consumption of the backlight module, and provide a guarantee for the ultra-thin LCD. So it will be the development trends in the last few years. The light guide plate as an important component in the edge-lit backlight system, affect the optical properties of the backlight and the quality of the screen. So the high-performance LGP is the key to the whole backlight.
The whole research work of this thesis is based on the47inch single-short-edge-lit type LGP and optical simulation software LightTools.
Firstly, we conducted a dots pattern design which is the most complex process and an important factor to the LGP optical properties. Step one, we established a model close to the real one in the software, simply setting the parameters of various components to highlight their own characteristics. Then we focused on the influence of various parameters of the dots pattern optical properties. The ratio of nearly specular reflection and scattering has little effect on the brightness distribution. The greater is scattering properties, the brighter is the area near light source. The change of Gaussian angle relatively has large impact on the brightness distribution. The smaller is the angle, the brighter is the area far from light source. Step two, the result has been fitted after the software automatically optimize the dots pattern distribution, to adjust the unrealistic fill rate of dots pattern. Usually the result is better in10-15times, which is smooth and not distorted. Step three, the samples has been made, which is used for the comparison of simulation results and experimental tests. The fourth sample has the great result.
Secondly, in order to get a long strip spot needed to meet the scanning backlight, the lenticular LGP has been simulated. We found that more closely arranged and the larger size semi-circular lens microstructure has the best spot effect.
本论文就以47寸单短边入光型的导光板展开了工作,整个研究工作是以光学模拟软件LightTools为平台进行的。
首先,我们进行了网点设计工作,是导光板开发中最为复杂的过程,也是影响导光板光学性能的重要因素。第一步,在软件中建立尽量接近于实际的模型,简化各组件光学属性设置以突出其本身的特性,重点分析了网点的光学属性各项参数的影响,其中近镜面反射和漫射属性的比例对整体亮度分布影响不大,只是漫射属性越大近光源处越亮,反之,近镜面发射属性越大远光源处亮度越高；而高斯角度的变化对整体亮度分布影响比较大,角度越大,光越集中在近光源处,反之,角度越小,光更集中在远光源处。第二步,在软件自动优化网点分布得出结果后,进行曲面拟合的工作,调整网点填充率不符合实际的细节,一般在10-15次后效果较好,即不失真也能做到平滑过渡。第三步,制作样品,将仿真结果与试验测试相对照为下一次改善提供依据。我们做的4次样品中第4次效果已经较为理想。
其次,为了得到满足扫描背光所需的长条形光斑,我们对透镜导光板进行了仿真模拟研究,发现在加工工艺允许的范围内,排布越紧密、尺寸越大的半圆形透镜微结构会有最好的光斑效果。
Edge-lit backlight module, especially single-short-edge-lit type, can significantly reduce the number of light sources used in liquid crystal displays and the power consumption of the backlight module, and provide a guarantee for the ultra-thin LCD. So it will be the development trends in the last few years. The light guide plate as an important component in the edge-lit backlight system, affect the optical properties of the backlight and the quality of the screen. So the high-performance LGP is the key to the whole backlight.
The whole research work of this thesis is based on the47inch single-short-edge-lit type LGP and optical simulation software LightTools.
Firstly, we conducted a dots pattern design which is the most complex process and an important factor to the LGP optical properties. Step one, we established a model close to the real one in the software, simply setting the parameters of various components to highlight their own characteristics. Then we focused on the influence of various parameters of the dots pattern optical properties. The ratio of nearly specular reflection and scattering has little effect on the brightness distribution. The greater is scattering properties, the brighter is the area near light source. The change of Gaussian angle relatively has large impact on the brightness distribution. The smaller is the angle, the brighter is the area far from light source. Step two, the result has been fitted after the software automatically optimize the dots pattern distribution, to adjust the unrealistic fill rate of dots pattern. Usually the result is better in10-15times, which is smooth and not distorted. Step three, the samples has been made, which is used for the comparison of simulation results and experimental tests. The fourth sample has the great result.
Secondly, in order to get a long strip spot needed to meet the scanning backlight, the lenticular LGP has been simulated. We found that more closely arranged and the larger size semi-circular lens microstructure has the best spot effect.
引文
[1]孙洵.平板显示产业的发展现状和前景分析(液晶专题).现代显示.2007.77：45-51
[2]王新久.液晶光学和液晶显示.北京.科学出版社.2006
[3]小林骏介.下一代液晶显示.北京.科学出版社.2004
[4]季旭东.平板电视的技术进展.光机电信息.2003.5：11-15
[5]费民权.液晶电视技术的发展现状分析.液晶与显示.2003.18(5)：379-387
[6]刘跃LCD、PDP、CRT发展现状及展望.稀土信息.2004.10：21-23
[7]汪晓松.场致发射平面显示器的发展及应用前景.电视技术.2006.6：39-40
[8]谢智波.平板显示技术的新进展.电视技术.2007.31(5)：34-36,45
[9]洪炯星.中国TFT液晶产业链发展研究[学位论文].上海.上海交通大学.2009
[10]张兵.大尺寸TFT-LCD产品发展趋势.电子产品世界.2006.04：108-111
[11]王晓明,郭伟玲,高国,沈光地.LED用于LCD背光源的前景展望.现代显示.2005.53：24-28
[12]雪生.用于LCD的LED背光源.现代显示.2005.53：34-37
[13]季旭东.新型LCD用LED背光源.照明工程学报.2004.15(2)：23-27
[14]叶逸仁.印刷式超薄导光板.中国.200720146213.0.2008.5.28
[15]刘明达,侯仕骑,饶瑞年.导光板模仁的制造方法.中国.200610136521.5.2008.4.30
[16]吴桔生,何华,李宏彦.导光板散射网点的初步设计.现代显示.2007.2
[17]李晓建.导光板的设计及制作方法研究[学位论文].苏州.苏州大学.2009
[18]Xingpeng Yang,Yingbai Yan and Guofan Jin.Polarized light guide plate for liquid crystal display.Optical Society of America.2005
[19]陈祥贤,徐平,万丽丽等.新型背光系统导光板技术.液晶与显示.2007(10)：576-582
[20]黄娟,段谷青,曾阳素.二元光学技术制作背光照明系统导光板.邵阳学院学报(自然科学版).2006(12)：38-41
[21]张楠,唐振方,栗万里等.光散射聚合物导光板的材料参数设计.光散射学报.2007(3)：55-59
[22]Hitoshi Taniguchi, Yasuo Hira.Liquid Crystal Display Device.US.6099134.2000.8.8
[23]金鹏,叶浩LightTools在LED背光设计中的应用.现代显示.2009.109
[24]骆健忠,陈哲,张永林,李丰丽,蔡昌.侧光平板式导光板散射网点设计及仿真分析.液晶与显示.2006.21(3)
[25]翟峰Novel Integrated Light-Guide Plates for Liquid Crystal Display Backlight.Journal of Optics.2005.7(3)
[26]翟峰High light guide plates that can control the illumination angle based on microprism structures.Applied Physics Letters.2004.85(24)
[27]Masayuki Shinohana,Shigeru Aoyama.Surface light source device,elements therefore and apparatus using the same.US.6231200.2001.5.15
[28]Akihiro Tagaya.Thin liquid-crystal display backlight system with highly scattering optical transmission polymers.Applied Optics.2005.7(3)
[29]Serge Habraken,Dems Vandorma.New microprism geometry in light guide plate for illumination devices.Proceedings of SPIE.2000
[30]汪玲玲.利用亚微米光栅制作导光板方法的研究[学位论文].苏州.苏州大学.2006
[31]Shin-Ichiro Ochia.Light guide plates and light guide plate assembly utilizing diffraction gratings.US.5703667.1997.10.30
[32]Seung Ryong Park,Oh Jang Kwon.Grating micro-dot patterned light guide plates for LED backlights.OPTICS EXPRESS.2007.3(19)
[33]D.R.Selviah,K.Wang.Modeling of a Color-Separating Backlight with Internal Mirrors.SID Symposium Diges.2004
[34]臧金浩.侧入式LED导光板结构的设计与优化[学位论文].西安.西北大学.2008
[35]王大巍,王刚,李俊峰,刘敬伟.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
[36]T Ide,H Mizuta,H Numata,Y Taira,M Suzuki,M Noguchi,Y Kastu.Dot Pattern Generation Technique Using Molecular Dynamics.J.Opt.Soe.Am.2000.20.(2)
[37]Jee-Gong Chang,Ming-Horng Su,Cheng-Tai Lee.Generation Random and Nonoverlapping Dot for Liquid-Crystal Display Backlight Light Guides using Molecular-Dynamics Method.JOURNAL OF APPLIED PHYSICS.2005
[38]赵星星.导光板网点随机分布和矢量性研究[学位论文].北京北京交通大学.2008
[39]孟晓.LED背光模组设计[学位论文].浙江.浙江大学.2007
[2]王新久.液晶光学和液晶显示.北京.科学出版社.2006
[3]小林骏介.下一代液晶显示.北京.科学出版社.2004
[4]季旭东.平板电视的技术进展.光机电信息.2003.5：11-15
[5]费民权.液晶电视技术的发展现状分析.液晶与显示.2003.18(5)：379-387
[6]刘跃LCD、PDP、CRT发展现状及展望.稀土信息.2004.10：21-23
[7]汪晓松.场致发射平面显示器的发展及应用前景.电视技术.2006.6：39-40
[8]谢智波.平板显示技术的新进展.电视技术.2007.31(5)：34-36,45
[9]洪炯星.中国TFT液晶产业链发展研究[学位论文].上海.上海交通大学.2009
[10]张兵.大尺寸TFT-LCD产品发展趋势.电子产品世界.2006.04：108-111
[11]王晓明,郭伟玲,高国,沈光地.LED用于LCD背光源的前景展望.现代显示.2005.53：24-28
[12]雪生.用于LCD的LED背光源.现代显示.2005.53：34-37
[13]季旭东.新型LCD用LED背光源.照明工程学报.2004.15(2)：23-27
[14]叶逸仁.印刷式超薄导光板.中国.200720146213.0.2008.5.28
[15]刘明达,侯仕骑,饶瑞年.导光板模仁的制造方法.中国.200610136521.5.2008.4.30
[16]吴桔生,何华,李宏彦.导光板散射网点的初步设计.现代显示.2007.2
[17]李晓建.导光板的设计及制作方法研究[学位论文].苏州.苏州大学.2009
[18]Xingpeng Yang,Yingbai Yan and Guofan Jin.Polarized light guide plate for liquid crystal display.Optical Society of America.2005
[19]陈祥贤,徐平,万丽丽等.新型背光系统导光板技术.液晶与显示.2007(10)：576-582
[20]黄娟,段谷青,曾阳素.二元光学技术制作背光照明系统导光板.邵阳学院学报(自然科学版).2006(12)：38-41
[21]张楠,唐振方,栗万里等.光散射聚合物导光板的材料参数设计.光散射学报.2007(3)：55-59
[22]Hitoshi Taniguchi, Yasuo Hira.Liquid Crystal Display Device.US.6099134.2000.8.8
[23]金鹏,叶浩LightTools在LED背光设计中的应用.现代显示.2009.109
[24]骆健忠,陈哲,张永林,李丰丽,蔡昌.侧光平板式导光板散射网点设计及仿真分析.液晶与显示.2006.21(3)
[25]翟峰Novel Integrated Light-Guide Plates for Liquid Crystal Display Backlight.Journal of Optics.2005.7(3)
[26]翟峰High light guide plates that can control the illumination angle based on microprism structures.Applied Physics Letters.2004.85(24)
[27]Masayuki Shinohana,Shigeru Aoyama.Surface light source device,elements therefore and apparatus using the same.US.6231200.2001.5.15
[28]Akihiro Tagaya.Thin liquid-crystal display backlight system with highly scattering optical transmission polymers.Applied Optics.2005.7(3)
[29]Serge Habraken,Dems Vandorma.New microprism geometry in light guide plate for illumination devices.Proceedings of SPIE.2000
[30]汪玲玲.利用亚微米光栅制作导光板方法的研究[学位论文].苏州.苏州大学.2006
[31]Shin-Ichiro Ochia.Light guide plates and light guide plate assembly utilizing diffraction gratings.US.5703667.1997.10.30
[32]Seung Ryong Park,Oh Jang Kwon.Grating micro-dot patterned light guide plates for LED backlights.OPTICS EXPRESS.2007.3(19)
[33]D.R.Selviah,K.Wang.Modeling of a Color-Separating Backlight with Internal Mirrors.SID Symposium Diges.2004
[34]臧金浩.侧入式LED导光板结构的设计与优化[学位论文].西安.西北大学.2008
[35]王大巍,王刚,李俊峰,刘敬伟.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
[36]T Ide,H Mizuta,H Numata,Y Taira,M Suzuki,M Noguchi,Y Kastu.Dot Pattern Generation Technique Using Molecular Dynamics.J.Opt.Soe.Am.2000.20.(2)
[37]Jee-Gong Chang,Ming-Horng Su,Cheng-Tai Lee.Generation Random and Nonoverlapping Dot for Liquid-Crystal Display Backlight Light Guides using Molecular-Dynamics Method.JOURNAL OF APPLIED PHYSICS.2005
[38]赵星星.导光板网点随机分布和矢量性研究[学位论文].北京北京交通大学.2008
[39]孟晓.LED背光模组设计[学位论文].浙江.浙江大学.2007