高效率與色彩飽和度之液晶模組

Abstract

本論文之目的在找出簡易的方式在增加液晶顯示器模組的色彩 飽和度之外還能夠維持原來的亮度。 目前大部分的背光使用的光源都已經改為藍色二極體激發黃色 螢光粉的方式，其中黃色螢光粉主要有Nichia 公司的釔鋁石榴石 （Yttrium Aluminum Garnet;YAG）以及歐司朗光電半導體所申請的 TAG螢光粉為主流，而在發光效率上YAG螢光粉的發光效率還是比 TAG 螢光粉較佳，但兩者因為在頻譜當中缺少綠色與紅色光譜，因 此在顯示器的色域上無法提昇。 在一般業界使用增加色域的方式是以藍色晶片加上紅、綠螢 光粉，補上頻譜的紅色以及綠色，不過也因為將能量分散給紅色以 及綠色螢光粉造成整體發光效率變低，因此在本論文中提出以YAG 螢光粉為主要發光架構，加上紅色晶片。經過實驗之後與原本YAG 螢光粉相比，在不影響發光效率的前提下，還可提高色飽和度。

The purpose of this study is to find a simple method to increase color gamut while keeping high brightness in current LCM module. Most industrial approach, applies R, G, B LED or blue chip with R, G phosphor to deal with color gamut issue. However, R, G, B multi-chips need complex circuit to control color temperature. The blue chip with R, G phosphor LED will improve color gamut, but sacrifice of brightness efficiency. Recently, most LCDs replaced backlight by LED. There are two yellow phosphor applied in white LED. One is YAG phosphor patented by Nichia, while TAG phosphor was patented by Osram. Both approaches suffer from low color gamut due to the lack of R, G spectra. In order to overcome this issue, we add additional red LEDs with current YAG-Based LED. This method was validated by experiment through brightness and color test.