The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
권호 표지

Two-Dimensional Dimming Algorithm using Light Spread Function

빛 확산 함수를 이용한 이차원 디밍 알고리즘

  • 정혜동 (전자부품연구원 RFID.USN융합연구센터) ;
  • 강성진 (한국기술교육대학교 정보기술공학부)
  • Received : 2010.07.14
  • Accepted : 2010.07.29
  • Published : 2010.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, in order to reduce the power consumption of LCD TV, we present a two-dimensional dimming algorithm for LED BLU(Backlight Unit) using light spread function and a pragmatic implementation method. In conventional two dimensional dimming algorithms, LED BLU is divided into MxN blocks and proper backlight luminance for each block is computed according to input image and used for dimming control. But, LED light of each block is diffused and affects the neighboring blocks so that luminance of each block becomes larger than that of intent. In the proposed algorithm, dimming control values are reduced by the amount of quantity affected by the neighboring blocks using light spread function, resulting in additional reduction of power consumption.

본 논문에서는 LCD TV의 전력 절감을 위해 빛 확산 함수(Light Spread Function)을 이용한 LED BLU(Backlight Unit)의 디밍 제어 알고리즘을 제안하고, 효율적으로 구현할 수 있는 방법을 제시한다. 기존의 이차원 디밍 제어 알고리즘은 BLU의 LED를 MxN개의 블록으로 분할하고, 각 분할 영역에 해당하는 입력 영상에 따라 백라이트의 밝기를 계산하여 디밍 제어를 수행한다. 그러나, 각 블록의 LED 빛은 확산되어 인접 블록에 영향을 주기 때문에 각 블록의 최종 휘도는 디밍 제어 값보다 크게 된다. 제안된 알고리즘은 빛 확산 함수를 이용하여 각 블록이 인접 블록으로부터 영향 받는 양 만큼 줄인 디밍 제어 값을 사용함으로써, 기존의 알고리즘보다 더 많은 전력 절감이 가능해진다.

Keywords

References

  1. Naehyuck Chang, Inseok Choi, Hojun Shim, "DLS: Dynamic Backlight Luminance Scaling of Liquid Crystal Display", IEEE Trans. on VLSI Systems, Vol.12, No.8, pp.837-846, Aug., 2004 https://doi.org/10.1109/TVLSI.2004.831472
  2. C. Lai, C. Tsai, "Backlight Power Reduction and Image Contrast Enhancement Using Adaptive Dimming for Global Backlight Applications," IEEE Trans. on Consumer Electronics, pp.669-674, Vol.54, No.2, May 2008 https://doi.org/10.1109/TCE.2008.4560145
  3. J. Hong, S. Kim, W. Song, "A Clipping Reduction Algorithm Using Backlight Luminance Compensation for Local Dimming Liquid Crystal Displays," IEEE Trans. on Consumer Electronics, pp.240-246, Vol.56, No.1, Feb. 2010 https://doi.org/10.1109/TCE.2010.5439151
  4. H.F.Chen, J. Sung, T. Ha, Y, Park, C, Hong, "Backlight Local Dimming Algorithm for High Contrast LCD-TV", Proceedings ASID 2006, pp.168-171, 2006
  5. T. Shirai, S. Shimizukawa, T. Shiga, S. Mikoshiba, "RGB-LED backlight for LCD-TVs with 0D, 1D, and 2D adaptive dimming," in SID'06 Dig., pp.1520-1522, 2006
  6. W. Oh, D. Cho, K. Cho, G. Moon, B. Yang, T. Jang, "A Novel Two-Dimensional Adaptive Dimming Technique of X-Y Channel Drivers for LED Backlight System in LCD TVs," IEEE Journal Display Technology, pp.20-26, Vol.5, No.1, Jan. 2009. https://doi.org/10.1109/JDT.2008.2004358
  7. Y. Cheng, Y. Lu, C. Tien, H. Shiech, "Design and Evaluation of Light Spread Function for Area-adaptive LCD System," IEEE Journal of Display Technology, pp.66-71, Vol.5. No.2, Feb. 2009. https://doi.org/10.1109/JDT.2008.2004279