本論文主要研究直下式的LED背光模組透過簡易的單晶片與數位類比轉換電壓解碼的電路方式，作為直下式背光模組的區域調光控制(Local Dimming)，透過調整不同區域背光源明暗的變化，來達到節能與提高影像的動態對比，使同一畫面上能表現出更亮與更暗的效果，並透過撰寫人機介面程式將電腦模擬影像訊號與光源模組掃描訊號發送至控制單元作為LED的控制。 透過量測方法們挑選控制特性相近的LED光源，並透過撰寫人機介面來控制微電腦單晶片，使得不同區域的LED能達到控制，且使用改變電壓的方式來做為光源亮暗的控制，加上運用時序的方式建立單晶片腳位掃描來改變多組光源在不同時間的控制訊號，最後透過本論文所研究的內容，整合成成區域調光控制的方法來驅動燈箱並量測其輝度，且與所建立的光學模擬來做為控制的驗證，透過模擬結果與實際量測可以發現，在背光模組中透過改變不同區域的亮暗能明顯觀察出不同區域明亮的差異，且驗證了在控制方面能透過單晶片的腳位掃描與數位類比轉換電路來完成不同區域的亮度控制。 The thesis researches direct-lit type LED backlight module, this paper uses single-chip micro-controller (MCU) and digital-analog (D/A) conversion circuit to control the direct-lit backlight module of the LED brightness adjustment. As a direct-lit type backlight local dimming controlled (Local Dimming), we adjust the lighting intensity to change in different regions in order to save energy and improve the image dynamic contrast, and make the image dark areas darker and bright areas brighter. First we use of measurement methods for selecting the control characteristics closer to the LED, then by changing the LED brightness level of the different regions. By adjusting the LED lighting intensity in different regions of backlight module, we can observe significantly the brightness differences in different regions of backlight module and verified the pins of control single-chip scanning and digital-analog conversion circuit to complete the different regions of the brightness control.
