共查询到17条相似文献,搜索用时 78 毫秒
1.
2.
设计激光投影机光学系统需要从如何减小光学系统的体积和提高激光光源的光效两个方面考虑。研究了激光显示照明系统中的复眼透镜,并对设计的复眼小透镜矩形单元进行了优化,发现在复眼透镜整体尺寸和单颗复眼小透镜焦距一定的情况下,整个复眼透镜上的阵列越多,即复眼透镜上蜂窝的数量越多,其匀光效果就越好,且此时投影机系统的体积也较小。为了提高激光光源的光效,设计中对复眼透镜在不同数值孔径照明光束下的匀光效果进行了讨论。并对优化设计后的复眼透镜进行40 000条光线追迹,实验显示其光线透过率可以达到92.5%,且几乎无杂散光。 相似文献
3.
设计激光投影机光学系统需要从如何减小光学系统的体积和提高激光光源的光效两个方面考虑。研究了激光显示照明系统中的复眼透镜,并对设计的复眼小透镜矩形单元进行了优化,发现在复眼透镜整体尺寸和单颗复眼小透镜焦距一定的情况下,整个复眼透镜上的阵列越多,即复眼透镜上蜂窝的数量越多,其匀光效果就越好,且此时投影机系统的体积也较小。为了提高激光光源的光效,设计中对复眼透镜在不同数值孔径照明光束下的匀光效果进行了讨论。并对优化设计后的复眼透镜进行40 000条光线追迹,实验显示其光线透过率可以达到92.5%,且几乎无杂散光。 相似文献
4.
5.
改进宽银幕投影显示照明系统的设计方法 总被引:4,自引:3,他引:1
照明系统是投影显示系统的重要组成部分,决定着整个系统的亮度和照明均匀性。复眼系统是一种常见的液晶投影显示系统照明结构。传统的复眼照明系统设计方法中,复眼小透镜具有与液晶板相同的长宽比,可以获得能量利用率和均匀性都比较好的照明光斑。但研究发现,利用这种方法设计宽银幕投影显示设备的复眼照明系统,会引起一定的光能损失。针对这一问题,通过对复眼系统设计理论的分析和对实际复眼照明系统的模拟,创新性地提出了在照明系统中引入柱面透镜改变复眼小透镜的长宽比的设计方法,能够有效的提高投影系统能量利用率。模拟计算结果表明,引入柱面透镜的复眼照明系统与传统方法设计的复眼系统相比,能量利用率可以提高5%到10%。 相似文献
6.
7.
8.
9.
10.
11.
Multi-objective design and extended optimization for developing a miniature light emitting diode pocket-sized projection display 总被引:1,自引:0,他引:1
This research proposes a new extended optimization method for a miniature light emitting diode (LED) pocket-sized projection
display, introducing integration of the Taguchi method and principal component analysis in order to optimize the multiple
quality characteristics of an LED pocket-sized projection display. With the aid of interactive optimization, control factors
with three different levels are carefully selected in the complicated preliminary experiments. A set of optimal design parameters
is well selected for best results on the combined effects of the total luminous flux, illumination uniformity, and the packing
size of the system. The selected control factors are inclusive of major lens and system specifications, such as lens overall
length, X-CUB semi-aperture, length of light integrator, width of integrator, total internal reflection (TIR) prism entering
semi-diameter for the TIR prism, air-gap of the TIR prism, and digital micromirror device (DMD) position; an L18 orthogonal
array is applied and implemented in the experiments. According to experimental results, the optimal design parameters for
the projection display can be determined as A1 (lens specifications: type I), B3 (lens length: overall length), C1 (X-CUB
semi-aperture: 8 mm), D3 (integrator length: 36.6 mm), E2 (integrator width: 3.5 mm), F2 (TIR prism entering semi-diameter:
11 mm), G1 (TIR prism air-gap: 1.0024 mm), and H1 (DMD location: −0:5 mm). In addition, analysis of variance (ANOVA) is also
employed to identify the factor A (lens specifications), factor D (integrator length), factor F (TIR prism entering semi-diameter),
and factor G (TIR prism air-gap) as key parameters, which account for 71.82% of the total variance. The other factors when
compared are found to have relatively weaker impacts on the process design. Furthermore, a confirmation experiment of the
optimal design parameters shows that the aforesaid multiple performance characteristics are optimized to achieve the best
levels. It is concluded that Taguchi method and principal component analysis (PCA) combine to optimize and then minimize the
LED pocket-sized projection display system, which not only yields a sufficient understanding of the effects of control factors,
but also produces an optimized design to ensure that the LED pocket-sized projection display system exhibits the best multiple
performance characteristics. 相似文献
12.
13.
14.
Mathematical model of light propagation through liquid crystal display working under real conditions
M. Olifierczuk 《Opto-Electronics Review》2008,16(3):287-296
The main aim of our work is to present a theory of light propagation through a liquid crystal display worked out in our University.
This theory takes into account real conditions of a display operation such as temporal coherence of light source, interference
phenomena, spectral characteristics of refractive coefficients of individual layers and their complex forms, real directions
of ordinary and extraordinary wavevectors into each layer, real directions of light polarization into anisotropic or dichroic
layers etc. Therefore, our theory can be used to determine optical parameters of a liquid crystal display operating under
real or at least quasi-real conditions. Contrary to other theories (e.g., Beremann or geometric optics approximation), this
model is characterized by a small number of simplifications. Thus, it can be used to analyse a display operating in special
conditions, such as military or out-door applications. In these cases, very high optical parameters (luminance and contrast
ratio) aare needed. Application of even small simplifications conducts to significant changes of calculated parameters. 相似文献
15.
为了辅助静脉穿刺及相关的医疗操作, 设计了一款基于投影式头戴显示器(HMPD)的静脉显像系统, 其光学系统由近红外成像系统和穿透型HMPD构成。利用光学设计软件ZEMAX优化设计近红外成像系统, 使其具有F/2.6的大数值孔径, 有利于弱反射红外光的收集成像。穿透型HMPD采用与近红外成像系统相同的光学结构, 有利于简化系统的加工装调。设计结果表明, 近红外成像系统成像质量优异, 分辨率达到QXGA(2 048×1 536)。穿透型HMPD具有18 mm的大出瞳直径及25 mm的大出瞳距离, 场曲小于0.03 D, 畸变小于0.32%, 达到QXGA分辨率显示模式。与现行的静脉显像系统相比, 本显像系统结构简单紧凑、佩戴舒适, 且具有超高分辨率, 是一款适用于辅助医疗的目视系统。 相似文献
16.
17.
天幕灯是一款用于近距离照射大面积幕布的特殊灯具。为了在限定的区域内获得幕布的均匀照明,天幕灯需实现非对称、大角度的特定出射光强分布。基于几何光学和辐照度理论,首先建立满足幕布均匀照明要求的天幕灯配光曲线模型,然后再根据LED光源的发光特性进行二次光学设计,使LED天幕灯的出射光强分布与所需的配光曲线模型相匹配。根据能量守恒定律将配光曲线模型进行均匀离散化处理,建立直射和反射的有效叠加和补偿,依此设计得到反射面面型,实现照明要求。通过Zemax对所设计的LED天幕灯进行模拟仿真,结果表明,满足配光曲线的LED天幕灯可以通过多个灯具的简单照明叠加实现在近距离范围内对不同大小和形状的幕布进行均匀照明,其照明均匀度可达到85%以上,能量利用率可达到80%以上。 相似文献