White LED Local Dimming Backlight for Aggressive Power Saving and Artifact Minimizing

  • Yeo, Dong-Min (LCD Technology Center, LCD Business, Samsung Electronics Co., LTD.) ;
  • Kwon, Yong-Hoon (LCD Technology Center, LCD Business, Samsung Electronics Co., LTD.) ;
  • Kang, Eui-Jeong (LCD Technology Center, LCD Business, Samsung Electronics Co., LTD.) ;
  • Park, Se-Ki (LCD Technology Center, LCD Business, Samsung Electronics Co., LTD.) ;
  • Yang, Byung-Choon (LCD Technology Center, LCD Business, Samsung Electronics Co., LTD.) ;
  • Kim, Gi-Cherl (LCD Technology Center, LCD Business, Samsung Electronics Co., LTD.) ;
  • Jang, Tae-Seok (LCD Technology Center, LCD Business, Samsung Electronics Co., LTD.)
  • Published : 2008.10.13

Abstract

Local dimming driving has advantages in reducing power consumption and improving contrast ratio(CR). In an LED backlight unit(BLU), many small LED blocks are implemented in 2-dimmensional space, and luminance of the blocks is controlled by a local dimming algorithm. However, such a BLU can induce various recognizable artifacts. A new novel algorithm is proposed for exact block luminance calculation to correct local dimming artifacts. Also we discuss modified low-gray-level dimming to achieve much aggressive power saving in a local dimming BLU system.