Direct-lit type backlight module local dimming controlled technology research

• Main Authors: Pei-Chih Liu, 柳沛志
• Other Authors: Chi-Feng Chen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/16337401987747688340

碩士 === 國立中央大學 === 光機電工程研究所 === 99 === 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.