How to use a phase-only spatial light modulator as a color display
How to use a phase-only spatial light modulator as a color display
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DOI：
10.1364/ol.40.000581
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发表时间：
2015-02-15
期刊：
影响因子：
3.6
通讯作者：
Ritsch-Marte, Monika
中科院分区：
文献类型：
--
作者：
Harm, Walter;Jesacher, Alexander;Ritsch-Marte, Monika
我们证明了一个平行排列的硅基液晶（PA-LCOS）空间光调制器（SLM），没有任何附加的彩色掩模，可以用作白光照明的全彩色显示器。该方法基于液晶像素（电压控制）双折射的波长依赖性。现代slm提供了一个宽范围的双折射可以调制，导致（与线性偏振器结合）反射光的几个强度调制周期作为施加电压的函数。由于色散的存在，振荡周期强烈依赖于波长。因此，施加到SLM像素上的每个电压对应于另一个反射光谱。对于具有足够宽调优范围的slm，可以获得一个调色板（即“颜色查找表”），它允许显示彩色图像。标准液晶显示器（lcd）在单个像素前使用彩色掩模，其优点是光效和显示分辨率提高了三倍。(C) 2015美国光学学会
We demonstrate that a parallel aligned liquid crystal on silicon (PA-LCOS) spatial light modulator (SLM) without any attached color mask can be used as a full color display with white light illumination. The method is based on the wavelength dependence of the (voltage controlled) birefringence of the liquid crystal pixels. Modern SLMs offer a wide range over which the birefringence can be modulated, leading (in combination with a linear polarizer) to several intensity modulation periods of a reflected light wave as a function of the applied voltage. Because of dispersion, the oscillation period strongly depends on the wavelength. Thus each voltage applied to an SLM pixel corresponds to another reflected color spectrum. For SLMs with a sufficiently broad tuning range, one obtains a color palette (i.e., a "color lookup-table"), which allows one to display color images. An advantage over standard liquid crystal displays (LCDs), which use color masks in front of the individual pixels, is that the light efficiency and the display resolution are increased by a factor of three. (C) 2015 Optical Society of America