基于FFS模式液晶面板的三维立体显示关键技术研究
发布时间：2018-08-28 08:03
【摘要】：摘要：三维(3D)立体显示凭借其比传统的二维(2D)显示更具身临其境的视觉感受,越来越得到更加广泛的研究和应用,将成为下一代显示技术的重要发展方向。本文基于边缘场开关(FFS)模式液晶面板,对3D显示中一些关键技术进行了研究。 对于快门式(SG)3D显示器件,本文针对制约FFS模式液晶面板应用于SG3D显示器件的瓶颈—响应时间问题,设计制备了FFS模式快响应液晶面板,并采用该液晶面板成功制备了SG3D显示器件。对FFS模式液晶面板响应时间的提升,主要从像素设计的优化、快响应液晶材料的设计,以及低液晶层厚等方面进行了研究。通过对面板像素的模拟,选取了像素电极周期(2nd ITO pitch)为8μm,电极宽度(Slit width)为2.7μm,电极与液晶取向夹角(Slit angle)11°,液晶层厚(Cell gap)从3.55μm减小到2.81μm的优化条件。结合像素结构的优化,设计了低粘度(γ1)、高弹性常数(k2)和高光学各向异性(△n)的快响应液晶材料,在驱动电压基本保持不变的情况下,灰阶响应时间(GTG RT)从7.43ms降低到4.48ms,相对于同样的液晶层厚,面板透过率相比于传统液晶提高了15.6%。同时,控制了白光色度和色温(CCT)的偏移。进一步地,采用FFS模式快响应液晶面板,制备了SG3D显示器件,其3D串扰(Crosstalk)达到3.7%。并且,当Cell gap从2.8μm调整到2.61μm时,优化的灰阶响应时间达到3.18ms,优化的3D crosstalk为3.33%,3D显示效果得到进一步提升。同时,研究了FFS模式下相位延迟(Retardation)对液晶光效和相对色温的影响：在260-350nm光程区间内,Retardation每增加10nm,液晶光效有约3%的提高,色温有约800-900K的降低。 对于偏光式(PR)3D显示器件,本文针对垂直方向3D串扰敏感、难以对3D视角进行精确评估的问题,分析研究了PR3D视角机理,推导建立了3D视角精确评估的理论模型。采用该模型,对基于FFS模式面板的PR3D垂直视角、PR的贴附偏差及PR与面板像素的匹配进行了研究。相比于传统3D视角计算方法,引入了串扰、像素开口和光界面折射等参数,提出和构建了新的3D视角评估模型,并推导了计算公式,实验验证了3D视角评估方法的有效性。系统研究了PR3D显示面板主要参数对3D视角的影响：3D视角与BM宽度、像素尺寸,以及玻璃基板和偏振片的折射率成正比,而与玻璃基板和偏振片的厚度成反比。减薄玻璃基板的厚度,是一种提升3D视角行之有效的方法。基于新的3D视角计算模型,推导和验证了当PR帖附发生偏差时的上下3D视角：PR帖附发生偏差时,上下3D视角有偏移发生,视角偏移沿PR相对于像素错位的方向,错位越多,3D视角偏移越大,但总的3D视角基本保持不变。基于新的3D视角计算模型,推导和验证了当PR收缩设计时的上下3D视角：PR收缩设计有利于将上下3D视角向中心汇聚,能实现更好的3D视角效果。对于PR3D显示器件,3D视角机理的分析和理论模型的建立,对于偏光立体显示中3D垂直视角和面板设计的优化具有重要的参考意义。 对于3D显示器件对图像的色彩再现能力提升,本文对应用于3D显示的FFS模式液晶面板的标准色域进行了设计研究。模拟分析了光谱对色度的影响,从LED背光源和彩膜两部分光谱进行了调节和优化,通过采用RG荧光粉LED背光匹配新的彩膜光阻,选取彩膜厚度2.2μm时,FFS模式3D显示器件的NTSC色域从65.3%提升到74.9%,sRGB匹配率从83.2%提升到100%,实现了sRGB标准色域的全覆盖,白光透过率达到28.1%。验证了背光源和彩膜光谱波峰位置向颜色纯化方向Shift、以及其半波宽度的窄化有利于色域的提升。
[Abstract]:Absrtact: Three-dimensional (3D) stereoscopic display is more and more widely studied and applied because of its more immediate visual experience than traditional two-dimensional (2D) display, and will become an important development direction of the next generation display technology.
For the shutter type (SG) 3D display device, this paper designs and fabricates the fast response liquid crystal panel in FFS mode, aiming at the bottleneck of the application of FFS mode LCD panel in SG3D display device, and successfully fabricates the SG3D display device with this LCD panel. Through the simulation of the panel pixels, the pixel electrode period (2nd ITO pitch) is 8 micron, the electrode width (Slit width) is 2.7 micron, the angle between the electrode and the liquid crystal orientation (Slit angle) is 11 degrees, and the thickness of the liquid crystal layer (Cell gap) is reduced from 3.55 micron to 2.81 micron. Combining with the optimization of pixel structure, a low viscosity (gamma 1), high elastic constant (k 2) and high optical anisotropy (delta n) fast response liquid crystal material was designed. The gray-scale response time (GTG RT) was reduced from 7.43 MS to 4.48 MS with the driving voltage unchanged. Compared with the same thickness of liquid crystal layer, the transmittance of the panel was lower than that of the traditional one. Furthermore, the fast response liquid crystal panel in FFS mode was used to fabricate the SG3D display device, and the Crosstalk was 3.7%. Moreover, when the Cell gap was adjusted from 2.8 to 2.61 micron, the optimized grey-scale response time was 3.18 ms, the optimized 3D crosstalk was 3.33%. At the same time, the effect of phase delay on the light efficiency and relative color temperature of liquid crystal in FFS mode is studied. For every 10 nm increase of Retardation, the light efficiency of liquid crystal increases by about 3% and the color temperature decreases by about 800-900K in the 260-350 nm optical path.
For polarized-light (PR) 3D display devices, in view of the problem that the vertical 3D crosstalk is sensitive and it is difficult to accurately evaluate the 3D viewing angle, the mechanism of PR3D viewing angle is analyzed and studied, and a theoretical model for precise evaluation of 3D viewing angle is deduced. Comparing with the traditional 3D viewing angle calculation method, the parameters of crosstalk, pixel opening and optical interface refraction are introduced. A new 3D viewing angle evaluation model is proposed and constructed, and the calculation formula is deduced. The validity of the 3D viewing angle evaluation method is verified by experiments. The influence of the main parameters of PR3D display panel on the 3D viewing angle is studied systematically. 3-D viewing angle is proportional to BM width, pixel size, and the refractive index of glass substrate and polarizer, but inversely proportional to the thickness of glass substrate and polarizer. Thinning the thickness of glass substrate is an effective method to enhance the 3-D viewing angle. Based on the new 3-D viewing angle calculation model, the up and down 3-D viewing angles are deduced and verified when PR attachment deviates. View angle: When PR attachment deviation occurs, the upper and lower 3D view angle deviates. The more the deviation, the greater the 3D view angle deviation. But the total 3D view angle remains unchanged. Based on the new 3D view angle calculation model, the upper and lower 3D view angle when PR contraction design is carried out is deduced and validated: PR contraction design is beneficial to the design of PR contraction. For PR3D display devices, the analysis of 3D viewing mechanism and the establishment of theoretical model are of great significance to the optimization of 3D vertical viewing angle and panel design in polarized stereoscopic display.
In order to improve the color reproduction ability of 3D display devices, the standard color gamut of FFS mode LCD panel for 3D display is designed and studied in this paper. The NTSC gamut of FFS mode 3D display was increased from 65.3% to 74.9% and the matching ratio of sRGB was increased from 83.2% to 100% when the thickness of color film was 2.2 micron. The full coverage of sRGB standard gamut was achieved, and the white light transmittance was 28.1%. It was verified that the peak position of backlight and color film was in the direction of color purification, and the narrowing of its half-wave width. Conducive to the promotion of color gamut.
【学位授予单位】：北京交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN873
本文编号：2208782
[Abstract]:Absrtact: Three-dimensional (3D) stereoscopic display is more and more widely studied and applied because of its more immediate visual experience than traditional two-dimensional (2D) display, and will become an important development direction of the next generation display technology.
For the shutter type (SG) 3D display device, this paper designs and fabricates the fast response liquid crystal panel in FFS mode, aiming at the bottleneck of the application of FFS mode LCD panel in SG3D display device, and successfully fabricates the SG3D display device with this LCD panel. Through the simulation of the panel pixels, the pixel electrode period (2nd ITO pitch) is 8 micron, the electrode width (Slit width) is 2.7 micron, the angle between the electrode and the liquid crystal orientation (Slit angle) is 11 degrees, and the thickness of the liquid crystal layer (Cell gap) is reduced from 3.55 micron to 2.81 micron. Combining with the optimization of pixel structure, a low viscosity (gamma 1), high elastic constant (k 2) and high optical anisotropy (delta n) fast response liquid crystal material was designed. The gray-scale response time (GTG RT) was reduced from 7.43 MS to 4.48 MS with the driving voltage unchanged. Compared with the same thickness of liquid crystal layer, the transmittance of the panel was lower than that of the traditional one. Furthermore, the fast response liquid crystal panel in FFS mode was used to fabricate the SG3D display device, and the Crosstalk was 3.7%. Moreover, when the Cell gap was adjusted from 2.8 to 2.61 micron, the optimized grey-scale response time was 3.18 ms, the optimized 3D crosstalk was 3.33%. At the same time, the effect of phase delay on the light efficiency and relative color temperature of liquid crystal in FFS mode is studied. For every 10 nm increase of Retardation, the light efficiency of liquid crystal increases by about 3% and the color temperature decreases by about 800-900K in the 260-350 nm optical path.
For polarized-light (PR) 3D display devices, in view of the problem that the vertical 3D crosstalk is sensitive and it is difficult to accurately evaluate the 3D viewing angle, the mechanism of PR3D viewing angle is analyzed and studied, and a theoretical model for precise evaluation of 3D viewing angle is deduced. Comparing with the traditional 3D viewing angle calculation method, the parameters of crosstalk, pixel opening and optical interface refraction are introduced. A new 3D viewing angle evaluation model is proposed and constructed, and the calculation formula is deduced. The validity of the 3D viewing angle evaluation method is verified by experiments. The influence of the main parameters of PR3D display panel on the 3D viewing angle is studied systematically. 3-D viewing angle is proportional to BM width, pixel size, and the refractive index of glass substrate and polarizer, but inversely proportional to the thickness of glass substrate and polarizer. Thinning the thickness of glass substrate is an effective method to enhance the 3-D viewing angle. Based on the new 3-D viewing angle calculation model, the up and down 3-D viewing angles are deduced and verified when PR attachment deviates. View angle: When PR attachment deviation occurs, the upper and lower 3D view angle deviates. The more the deviation, the greater the 3D view angle deviation. But the total 3D view angle remains unchanged. Based on the new 3D view angle calculation model, the upper and lower 3D view angle when PR contraction design is carried out is deduced and validated: PR contraction design is beneficial to the design of PR contraction. For PR3D display devices, the analysis of 3D viewing mechanism and the establishment of theoretical model are of great significance to the optimization of 3D vertical viewing angle and panel design in polarized stereoscopic display.
In order to improve the color reproduction ability of 3D display devices, the standard color gamut of FFS mode LCD panel for 3D display is designed and studied in this paper. The NTSC gamut of FFS mode 3D display was increased from 65.3% to 74.9% and the matching ratio of sRGB was increased from 83.2% to 100% when the thickness of color film was 2.2 micron. The full coverage of sRGB standard gamut was achieved, and the white light transmittance was 28.1%. It was verified that the peak position of backlight and color film was in the direction of color purification, and the narrowing of its half-wave width. Conducive to the promotion of color gamut.
【学位授予单位】：北京交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN873
【共引文献】
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