Pucilowski J, Schuman R, Velasquez J
Appl Opt. 1974 Oct 1;13(10):2248-52. doi: 10.1364/AO.13.002248.
This paper describes a technique for calculating the resultant contrast of displays incorporating various filters or filter combinations. In particular, contrast of such displays employing red or green light emitting diodes (LED's) as the active elements is tabulated. The results indicate that adequate contrast enhancement of red LED's in high light level environments is usually achieved using neutral density or bandpass filters with antireflective coatings. Green LED'S must be designed to have a high degree of specular reflectance so that a circular polarizer may be employed in order to achieve similar results. A discussion of required filter bandwidth to accommodate shifts in peak spectral output of LED'S due to manufacturer's tolerances and temperature effects is also included.
本文描述了一种计算包含各种滤光器或滤光器组合的显示器合成对比度的技术。特别地，列出了以红色或绿色发光二极管（LED）作为有源元件的此类显示器的对比度。结果表明，在高光水平环境中，通常使用具有抗反射涂层的中性密度滤光器或带通滤光器来实现红色LED的充分对比度增强。绿色LED必须设计成具有高度的镜面反射率，以便可以使用圆偏振器来获得类似的结果。还包括对所需滤光器带宽的讨论，以适应由于制造商公差和温度效应导致的LED峰值光谱输出的变化。
