Abstract

In recent years, low-power technology has had a significant impact on portable electronic devices; with mobile devices, the low-power circuit design has become the primary issue. At present, thin-film transistor liquid crystal display (TFT LCD) is widely used in handheld mobile devices. In terms of the overall system power consumption, TFT LCD power consumes 20%–45% of total system power due to different applications. The backlight of an LCD display dominates the power consumption of the whole system; controlling the backlight current to reduce the brightness and the contrast of LCDs can reduce the overall power consumption. However, this may cause significant changes in visual perception. In order to reduce the power consumption and eliminate the visual changes, the issue becomes: how to reduce the current by adjusting brightness and contrast in accordance with the current image. Based on content analysis, this paper proposes two new algorithms: the new backlight-dimming algorithm (NBDA) and the new image enhancement algorithm (NIEA). The proposed methods can, on average, simultaneously reduce power consumption by 47% and improve the image enhancement ratio by 6.8%. Moreover, the structural-similarity index metric (SSIM) is used to evaluate image quality.

© 2011 IEEE

PDF Article

References

  • View by:
  • |
  • |

  1. G. Z. Wang, F. C. Lin, Y. P. Huang, "Delta-color adjustment for spatial modulated color backlight algorithm on high dynamic range LCD TVs," J. Display Technol. 6, 215-220 (2010).
  2. C. H. Chen, H. P. D. Shieh, "Effects of backlight profiles on perceived image quality for high dynamic range LCDs," J. Display Technol. 4, 153-159 (2008).
  3. W. S. Oh, D. Cho, K. M. Cho, G. W. Moon, B. Yang, T. Jang, "A novel two-dimensional adaptive dimming technique of X-Y channel drivers for LED backlight system in LCD TVs," J. Display Technol. 5, 20-26 (2009).
  4. F. C. Lin, Y. P. Huang, L. Y. Liao, C. Y. Liao, H.-P. D. Shieh, T. M. Wang, S. C. Yeh, "Dynamic backlight gamma on high dynamic range LCD TVs," J. Display Technol. 4, 139-146 (2008).
  5. C.-C. Lai, C.-C. Tsai, "Backlight power reduction and image contrast enhancement using adaptive dimming for global backlight applications," IEEE Trans. Consumer Electron. 54, 669-674 (2008).
  6. T. Shirai, S. Shimizukawa, T. Shiga, S. Mikoshiba, "RGB-LED backlights for LCD-TVs with 0D, 1D, and 2D adaptive dimming," SID2006 Digest of Technical Papers (2006) pp. 1520-1523.
  7. H. Chen, J. Sung, T. Ha, Y. Park, "Locally pixel-compensated backlight dimming for improving static contrast on LED backlight LCDs," SID2007 Dig. Tech. Papers (2007) pp. 1339-1342.
  8. D. Yeo, Y. Kwon, E. Kang, S. Park, B. Yang, G. Kim, T. Jang, "Smart algorithms for local dimming LED backlight," SID Int. Symp. Dig. Tech. Papers (2008) pp. 986-989.
  9. S. Lee, K. Um, B. Choi, "A power reduction method for LCD backlight based on human visual characteristics," Proc. Int. Conf. on Consumer Electron. (2008) pp. 197-198.
  10. N. Raman, G. J. Hekstra, "Content based contrast enhancement for liquid crystal displays with backlight modulation," IEEE Trans. Consumer Electron. 51, 18-21 (2005).
  11. E. Y. Oh, S. H. Baik, M. H. Sohn, K. D. Kim, H. J. Hong, J. Y. Bang, K. J. Kwon, M. H. Kim, H. Jang, J. K. Yoon, I. J. Chung, "IPSmode dynamic LCD-TV realization with low black luminance and high contrast by adaptive dynamic image control technology," J. Soc. Inf. Display 13, 215-219 (2005).
  12. C.-C. Sun, S.-J. Ruan, M.-C. Shie, T.-W. Pa, "Dynamic contrast enhancement based on histogram specification," IEEE Trans. Consumer Electron. 51, 1300-1305 (2005).
  13. H. Cho, O. Kwon, "A backlight dimming algorithm for low power and high image quality LCD applications," IEEE Trans. Consumer Electron. 55, 839-844 (2009).
  14. A. Bartolini, M. Ruggiero, L. Benini, "Visual quality analysis for dynamic backlight scaling in LCD systems," Proc. IEEE Des. Autom. & Test in Eur. Conf. & Exhib. (2009) pp. 1428-1433.
  15. M. Ruggiero, A. Bartolini, L. Benini, "DBS4video: Dynamic luminance backlight scaling based on multi-histogram frame characterization for video streaming application," Proc. 8th ACM EMSOFT (2008) pp. 109-118.
  16. Z. Wang, A. C. Bovik, H. R. Sheikh, E. P. Simoncelli, "Image quality assessment: From error visibility to structural similarity," IEEE Trans. Image Process. 13, 600-612 (2004).
  17. S. Lee, K. Um, B. Choi, "A power reduction method for LCD backlight based on human visual characteristics," Proc. Int. Conf. on Consumer Electron. (2008) pp. 1-2.

2010 (1)

2009 (2)

W. S. Oh, D. Cho, K. M. Cho, G. W. Moon, B. Yang, T. Jang, "A novel two-dimensional adaptive dimming technique of X-Y channel drivers for LED backlight system in LCD TVs," J. Display Technol. 5, 20-26 (2009).

H. Cho, O. Kwon, "A backlight dimming algorithm for low power and high image quality LCD applications," IEEE Trans. Consumer Electron. 55, 839-844 (2009).

2008 (3)

2005 (3)

N. Raman, G. J. Hekstra, "Content based contrast enhancement for liquid crystal displays with backlight modulation," IEEE Trans. Consumer Electron. 51, 18-21 (2005).

E. Y. Oh, S. H. Baik, M. H. Sohn, K. D. Kim, H. J. Hong, J. Y. Bang, K. J. Kwon, M. H. Kim, H. Jang, J. K. Yoon, I. J. Chung, "IPSmode dynamic LCD-TV realization with low black luminance and high contrast by adaptive dynamic image control technology," J. Soc. Inf. Display 13, 215-219 (2005).

C.-C. Sun, S.-J. Ruan, M.-C. Shie, T.-W. Pa, "Dynamic contrast enhancement based on histogram specification," IEEE Trans. Consumer Electron. 51, 1300-1305 (2005).

2004 (1)

Z. Wang, A. C. Bovik, H. R. Sheikh, E. P. Simoncelli, "Image quality assessment: From error visibility to structural similarity," IEEE Trans. Image Process. 13, 600-612 (2004).

IEEE Trans. Consumer Electron. (4)

C.-C. Lai, C.-C. Tsai, "Backlight power reduction and image contrast enhancement using adaptive dimming for global backlight applications," IEEE Trans. Consumer Electron. 54, 669-674 (2008).

C.-C. Sun, S.-J. Ruan, M.-C. Shie, T.-W. Pa, "Dynamic contrast enhancement based on histogram specification," IEEE Trans. Consumer Electron. 51, 1300-1305 (2005).

H. Cho, O. Kwon, "A backlight dimming algorithm for low power and high image quality LCD applications," IEEE Trans. Consumer Electron. 55, 839-844 (2009).

N. Raman, G. J. Hekstra, "Content based contrast enhancement for liquid crystal displays with backlight modulation," IEEE Trans. Consumer Electron. 51, 18-21 (2005).

IEEE Trans. Image Process. (1)

Z. Wang, A. C. Bovik, H. R. Sheikh, E. P. Simoncelli, "Image quality assessment: From error visibility to structural similarity," IEEE Trans. Image Process. 13, 600-612 (2004).

J. Display Technol. (4)

J. Soc. Inf. Display (1)

E. Y. Oh, S. H. Baik, M. H. Sohn, K. D. Kim, H. J. Hong, J. Y. Bang, K. J. Kwon, M. H. Kim, H. Jang, J. K. Yoon, I. J. Chung, "IPSmode dynamic LCD-TV realization with low black luminance and high contrast by adaptive dynamic image control technology," J. Soc. Inf. Display 13, 215-219 (2005).

Other (7)

S. Lee, K. Um, B. Choi, "A power reduction method for LCD backlight based on human visual characteristics," Proc. Int. Conf. on Consumer Electron. (2008) pp. 1-2.

A. Bartolini, M. Ruggiero, L. Benini, "Visual quality analysis for dynamic backlight scaling in LCD systems," Proc. IEEE Des. Autom. & Test in Eur. Conf. & Exhib. (2009) pp. 1428-1433.

M. Ruggiero, A. Bartolini, L. Benini, "DBS4video: Dynamic luminance backlight scaling based on multi-histogram frame characterization for video streaming application," Proc. 8th ACM EMSOFT (2008) pp. 109-118.

T. Shirai, S. Shimizukawa, T. Shiga, S. Mikoshiba, "RGB-LED backlights for LCD-TVs with 0D, 1D, and 2D adaptive dimming," SID2006 Digest of Technical Papers (2006) pp. 1520-1523.

H. Chen, J. Sung, T. Ha, Y. Park, "Locally pixel-compensated backlight dimming for improving static contrast on LED backlight LCDs," SID2007 Dig. Tech. Papers (2007) pp. 1339-1342.

D. Yeo, Y. Kwon, E. Kang, S. Park, B. Yang, G. Kim, T. Jang, "Smart algorithms for local dimming LED backlight," SID Int. Symp. Dig. Tech. Papers (2008) pp. 986-989.

S. Lee, K. Um, B. Choi, "A power reduction method for LCD backlight based on human visual characteristics," Proc. Int. Conf. on Consumer Electron. (2008) pp. 197-198.

Cited By

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