由於RGB LED光源，除具有高純度的單色光的展現外，還具備低耗電的節能效率與符合危害物質禁用的環保規範，為目前照明與顯示器業界的主要發展之一。本論文利用不同偵測方法來偵測RGB LED背光模組之色度變化情形，並加以分析比較這些方法的優缺點。這些方法主要利用色度儀、可攜式光譜分析儀與一般用的彩色數位相機做為偵測的基本架構，另外，由背光模組所使用之線光源RGB LED light-bar以不同電路驅動方式，來顯示RGB三原色狀態與六種混光模式，並將背光模組顯示範圍等分出3x3矩陣之9點區域來做為色度量測。
本研究所使用之色度儀是以單點移動方式直接量測得到9點區域色度。不同於光譜分析儀所量測得到的光譜功率分佈（spectral power distribution，SPD）資料，並利用CIE 1931色度系統與Matlab 程式來計算色度。而彩色數位相機則是取得整面顯示範圍的影像資訊，經Matlab程式一次取出9點區域的色彩分佈資料，再運用CIE 1931色度系統與Matlab程式來計算色度。
經研究發現在RGB顯示狀態下之數據，可觀察出三種偵測方法的色彩偵測能力，以NTSC標準來評價優劣依序為色度儀139.86%、光譜分析儀108.42%、彩色數位相機70.69%。而在六種混光模式下之數據，可觀察出三種偵測方法在色彩最小變化下所能偵測到較大偏差值來做為敏銳度的判定，其優劣依序為光譜分析儀0.065%、色度儀0.047%、彩色數位相機0.014%。並由色度與色溫數據確認彩色數位相機具有色度儀及光譜分析儀的偵測趨勢，能夠運用於背光模組偵測，而且經由Matlab程式取影像計算，ㄧ次處理多點色彩資料，比單點移動方式更可快速取得色度值。

The RGB LED light source not only performs high purity monochromatic light and low power consumption, but also conforms to the environmental protection rule of Restriction of Hazardous Substance. It is one of the major developing techniques for flat panel display industries. This thesis utilized different detection methods to detect the chromaticity variation of RGB LED back lighting units, and then analyzed the advantages and disadvantages of them. These methods primarily involved color-meters, portable spectrometers, and normal color digital cameras as basic frameworks for detection. In addition, the linear light source LED light-bars used in back lighting units were used to exhibit the RGB’s three primary colors and six mixed-color modes through different circuit driver methods. We divided the back lighting unit display area into a 3x3 matrix with nine points for chromatic measurement.
The color-meter used in this study directly measured the chromaticity at nine points by single-point movement, which was different from the spectral power distributions measured by the spectrometer. The digital camera obtained image information from the complete display area, then extracted the color map distribution data from nine points at once. Finally, the CIE1931 color system and Matlab programs were used to calculate chromaticity.
Using data from RGB LED back lighting unit, this study found that the chromatic detection capacities of the three detection methods- evaluated by NTSC standards, were: color-meter 139.86%, spectrometer 108.42%, and color digital camera 70.69%. By using data from the six mixed-light mode, we can determine the sensitivity based on the largest variance detected by the three detection methods facing minimal color changes, the detection methods were ranked in order as: spectrometer 0.065%, color-meter 0.047%, color digital camera 0.014%. Chromaticity and color temperature data were used to confirm that the color digital camera possessed the detection trends of color-meters and spectrometers, which were useful for RGB LED back lighting unit detection, capturing images via the Matlab program, processing multiple points of color data at once, and obtaining chromaticity values more quickly than the single-point movement method.

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