Lee Jiun-Haw, Zhu Xinyu, Lin Yi-Hsin, Choi Wing, Lin Tien-Chun, Hsu Sheng-Chih, Lin Hoang-Yan, Wu Shin-Tson
Opt Express. 2005 Nov 14;13(23):9431-8. doi: 10.1364/opex.13.009431.
A high ambient-contrast-ratio (A-CR) and large aperture-ratio display is conceptually demonstrated and experimentally validated by stacking a normally black reflective liquid crystal display (NB-RLCD) and an organic light-emitting device (OLED). Such a tandem device can be switched between the NB-RLCD mode and the OLED mode under bright and dark ambient light, respectively. The normally black characteristic of the RLCD also helps to boost the A-CR under OLED-mode operation. To obtain a better image quality in the RLCD mode, a bumpy and transmissive structure is used to eliminate the specular reflection and to increase the viewing angle performance that results in CR>2:1 over 55 degrees viewing cone. Besides, such a structure can also increase the external quantum efficiency of the OLED by 49.4%. In our experiments, regardless of the ambient intensity the A-CR is kept higher than 100:1.
通过堆叠常黑反射型液晶显示器（NB-RLCD）和有机发光器件（OLED），从概念上演示并通过实验验证了一种高环境对比度（A-CR）和大孔径比的显示器。这种串联器件可以分别在明亮和黑暗环境光下在NB-RLCD模式和OLED模式之间切换。RLCD的常黑特性也有助于在OLED模式操作下提高A-CR。为了在RLCD模式下获得更好的图像质量，采用了一种凹凸不平的透射结构来消除镜面反射并提高视角性能，从而在55度视角锥范围内实现CR>2:1。此外，这种结构还可以将OLED的外部量子效率提高49.4%。在我们的实验中，无论环境强度如何，A-CR都保持高于100:1。
