- 學位論文
利用光學偏光膜於有機發光二極體視覺影像改善之研究
Study for Visual Image Improvement of an Organic Light-Emitting Diode Using Optical Polarizers
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摘要
本研究主要的目的是在改善有機發光二極體顯示面板對人眼的視覺影像之表現，研究的內容主要是針對影響人眼在視覺影像表現的關鍵因子來進行探討；例如，改善人眼對顯示面板的反射敏感度和其所呈現的對比與色彩飽和度。 首先，使用薄膜光學反射原理與國際照明協會在1931年所定義的標準(CIE1931)來模擬本實驗的有機發光二極體顯示面板上的反射與色彩飽和度，根據模擬的結果來選擇相關材料的光學偏光膜。 實驗的結果顯示；使用染料性的光學偏光膜在有機發光二極體的顯示面板上，能夠有效的降低86.6%在人眼最敏感的視覺波長區域(525~580nm)的反射，根據模擬得結果可以增加有機發光二極體顯示面板上的色彩飽和度約11%(從59.4%到65.7%)與實際的結果接近，提升整體在戶外與室內的模擬環境光源下2.42倍與2.73倍整體的影像對比度。而使用傳統碘系的光學偏光膜在有機發光二極體的顯示面板上，能夠有效的降低91.2%人眼在最敏感的視覺波長區域的反射，並提升在戶外與室內的模擬環境光源下5.05倍與6.09倍整體的影像對比度。
並列摘要
The present work investigated the visual image improvement of an organic light emitting diode (OLED) which is based on some theoretical frameworks and the optical property of a dye-polarizer composed of a linear polarizer and a quarter wave phase retarder. It is presented to study the key performance indexes in the visions, i.e. visual reflective sensitivity, contrast ratio and color saturation. First, the reflectance and color saturation the panel of the experimental OLED was simulated and calculated by using a transfer matrix method of thin-film optical filters and the definition rule of the color performances in the 1931 index of the Commission International de l’Eclairage (CIE1931). The material-polarizer composed of a linear polarizer and a quarter wave phase retarder was chosen to use on the panel of an OLED after the simulated and calculated prediction. The results clearly showed the excellent performances of using the dye-polarizer on panel of an organic light emitting diode in the theoretical calculation and practical application. In the practical application of using dye-polarizer on the panel of an organic light emitting diode, it was able to reduce visual reflective sensitivity by 86.6 % in the best sensitivity region of human eyes (525~580nm), increased color saturation 11% and improved the contrast ratio of the image to 2.72 and 2.43 times in a simulated indoor ambience and a simulated outdoor ambience. In another practical application, using iodine-polarizer on the panel of an OLED was also able to reduce visual reflective sensitivity by 91.2 % and improved the contrast ratio of the image to 6.09 and 5.05 times in a simulated indoor ambience and a simulated outdoor ambience. These ratiocination models were applied to investigate the visual performance of a display to choose the combination of an adapted optical film and the panel of an OLED.
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