Abstract

In this paper, a novel two-dimensional (2-D) adaptive dimming technique with X-Y channels for light-emitting diode (LED) backlight system in LCD TVs is proposed. The proposed LED backlight has matrix-structured LED modules with row and column switches to control the brightness of individual division block. It shows local dimming effects such as reduced power consumption and high dynamic contrast ratio even with much less number of LED drivers than that of the conventional 2-D local dimming method. Therefore, low cost and compact design of LED drivers can be achieved. This paper also contains a new adaptive dimming algorithm and image manipulation technique for the proposed LED backlight system. The proposed dimming technique is verified by simulation and experimental results based on a RGB-LED backlight of a 32-in LCD TV.

© 2009 IEEE

PDF Article

References

  • View by:
  • |
  • |

  1. A. Konno, Y. Yamamoto, T. Inuzuka, "RGB color control system for LED backlight in IPS-LCD TVs," SID'05 Dig. (2005) pp. 1380-1380.
  2. I. Hwang, C. W. Park, S. C. Kang, D. S. Sakong, "Image synchronized brightness control," SID'01 Dig. (2001) pp. 492-493.
  3. W.-C. Cheng, M. Pedram, "Power minimization in a backlit TFT-LCD display by concurrent brightness and contrast scaling," IEEE Trans. Consumer Electron. 50, 25-32 (2004).
  4. A. Konno, Y. Yamamoto, T. Inuzuka, "RGB color control system for LED backlight in IPS-LCD TVs," SID'05 Dig. (2005) pp. 1380-1380.
  5. N. Chang, I. Choi, H. Shim, "Dynamic backlight luminance scaling of liquid crystal display," IEEE Trans. Very Large Scale Integr. Syst. 12, 837-846 (2004).
  6. T. Shiga, S. Mikoshiba, "Reduction of LCTV backlight power and enhancement of gray scale capability by using adaptive dimming technique," SID'03 Dig. (2003) pp. 1364-1367.
  7. H. Chen, J. Sung, T. Ha, Y. Park, C. Hong, "Backlight local dimming algorithm for high contrast LCD TV," ASID'06 Dig. (2006) pp. 168-171.
  8. T. Shirai, S. Shimizukawa, T. Shiga, S. Mikoshiba, "RGB-LED backlight for LCD-TVs with 0D, 1D, and 2D adaptive dimming," SID'06 Dig. (2006) pp. 1520-1522.
  9. H. J. Peng, W. Zhang, C. K. Hung, C. J. Tsai, K. W. Ng, S. L. Chen, "High dynamic range LCD TV using active dynamic LED backlight," Proc. Asia Display 2007 429-432 (2007).
  10. D. Cho, W. S. Oh, K. M. Cho, G. W. Moon, B. Yang, T. Jang, "New X-Y channel driving method for LED backlight system in LCD TVs," Proc. IMID 2007 1001-1004 (2007).
  11. W. S. Oh, K. M. Cho, D. Cho, G. W. Moon, B. Yang, T. Jang, "A novel adaptive dimming technique with X-Y channels for led backlight system of LCD TVs," Proc. ICPE 2007 710-713 (2007).

2007 (3)

H. J. Peng, W. Zhang, C. K. Hung, C. J. Tsai, K. W. Ng, S. L. Chen, "High dynamic range LCD TV using active dynamic LED backlight," Proc. Asia Display 2007 429-432 (2007).

D. Cho, W. S. Oh, K. M. Cho, G. W. Moon, B. Yang, T. Jang, "New X-Y channel driving method for LED backlight system in LCD TVs," Proc. IMID 2007 1001-1004 (2007).

W. S. Oh, K. M. Cho, D. Cho, G. W. Moon, B. Yang, T. Jang, "A novel adaptive dimming technique with X-Y channels for led backlight system of LCD TVs," Proc. ICPE 2007 710-713 (2007).

2004 (2)

W.-C. Cheng, M. Pedram, "Power minimization in a backlit TFT-LCD display by concurrent brightness and contrast scaling," IEEE Trans. Consumer Electron. 50, 25-32 (2004).

N. Chang, I. Choi, H. Shim, "Dynamic backlight luminance scaling of liquid crystal display," IEEE Trans. Very Large Scale Integr. Syst. 12, 837-846 (2004).

IEEE Trans. Consumer Electron. (1)

W.-C. Cheng, M. Pedram, "Power minimization in a backlit TFT-LCD display by concurrent brightness and contrast scaling," IEEE Trans. Consumer Electron. 50, 25-32 (2004).

IEEE Trans. Very Large Scale Integr. Syst. (1)

N. Chang, I. Choi, H. Shim, "Dynamic backlight luminance scaling of liquid crystal display," IEEE Trans. Very Large Scale Integr. Syst. 12, 837-846 (2004).

Proc. Asia Display 2007 (1)

H. J. Peng, W. Zhang, C. K. Hung, C. J. Tsai, K. W. Ng, S. L. Chen, "High dynamic range LCD TV using active dynamic LED backlight," Proc. Asia Display 2007 429-432 (2007).

Proc. ICPE 2007 (1)

W. S. Oh, K. M. Cho, D. Cho, G. W. Moon, B. Yang, T. Jang, "A novel adaptive dimming technique with X-Y channels for led backlight system of LCD TVs," Proc. ICPE 2007 710-713 (2007).

Proc. IMID 2007 (1)

D. Cho, W. S. Oh, K. M. Cho, G. W. Moon, B. Yang, T. Jang, "New X-Y channel driving method for LED backlight system in LCD TVs," Proc. IMID 2007 1001-1004 (2007).

Other (6)

T. Shiga, S. Mikoshiba, "Reduction of LCTV backlight power and enhancement of gray scale capability by using adaptive dimming technique," SID'03 Dig. (2003) pp. 1364-1367.

H. Chen, J. Sung, T. Ha, Y. Park, C. Hong, "Backlight local dimming algorithm for high contrast LCD TV," ASID'06 Dig. (2006) pp. 168-171.

T. Shirai, S. Shimizukawa, T. Shiga, S. Mikoshiba, "RGB-LED backlight for LCD-TVs with 0D, 1D, and 2D adaptive dimming," SID'06 Dig. (2006) pp. 1520-1522.

A. Konno, Y. Yamamoto, T. Inuzuka, "RGB color control system for LED backlight in IPS-LCD TVs," SID'05 Dig. (2005) pp. 1380-1380.

A. Konno, Y. Yamamoto, T. Inuzuka, "RGB color control system for LED backlight in IPS-LCD TVs," SID'05 Dig. (2005) pp. 1380-1380.

I. Hwang, C. W. Park, S. C. Kang, D. S. Sakong, "Image synchronized brightness control," SID'01 Dig. (2001) pp. 492-493.

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.