Abstract

Backlight dimming of Liquid Crystal Displays (LCD) is a technology which aims at saving power and improving visual quality. The evolution of energy standards and the increasing public expectations regarding power consumption have made it necessary for backlight systems to manage their power. Such a control is challenging to implement, because for LCD displays quality and power are closely interlinked, and one cannot be modified without affecting the other. To address this issue, we present a framework for power controlled backlight dimming defining some key concepts. Two methods to obtain backlights with a predefined power level for images are presented: one method has low complexity and the other achieves high performance in terms of quality/power trade-off. Those methods are evaluated on a modeled Light-Emitting Diode edge-lit backlight display. The high-performance method performs significantly better than other algorithms from the literature, when considering both calculated power and quality. This high-performance method is then extended to video in three modes. The first mode favors high quality in a power-aware manner and allow significant power variations, the second mode has strict power constraints and the third one provides a trade-off between the other two.

© 2013 IEEE

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  1. The European Commission“Implementing directive 2005/32/EC of the European Parliament and of the Council with regard to ecodesign requirements for televisions,” Official Journal of the European Union (2009) Accessed: Nov. 2012.
  2. IEC“EU, Australia and US regulation on energy consumption in TV sets,” IEC 62087-2008 (2008) Accessed: 2010.
  3. The European Commission“China Regulation on Energy Consumption in TV Sets,” GB 24850-2010 (2010) Accessed: 2011.
  4. GfK Retail and Technology“International survey on the importance of the energy efficiency of TV appliances,” (2008) Accessed: 2012.
  5. H. Seetzen, W. Heidrich, W. Stuerzlinger, G. Ward, L. Whitehead, M. Trentacoste, A. Ghosh, A. Vorozcovs, "High dynamic range display systems," ACM Trans. Graph. 23, 760-768 (2004).
  6. M. Albrecht, A. Karrenbauer, T. Jung, C. Xu, "Sorted sector covering combined with image condensation: An efficient method for local dimming of direct-lit and edge-lit LCDs," IEICE Trans. Electron. E93-C, 1556-1563 (2010).
  7. X. Shu, X. Wu, S. Forchhammer, "Optimal local dimming for LC image formation with controllable backlighting," IEEE Trans. Image Process. 22, 166-173 (2012).
  8. S.-J. Kang, Y. H. Kim, "Multi-histogram-based backlight dimming for low power liquid crystal displays," J. Display Technol. 7, 544-549 (2011).
  9. N. Burini, E. Nadernejad, J. Korhonen, S. Forchhammer, X. Wu, "Image dependent energy-constrained local backlight dimming," Proc. 19th IEEE Int. Conf. on Image Process. (2012) pp. 2797-2800.
  10. N. Burini, E. Nadernejad, J. Korhonen, S. Forchhammer, X. Wu, "Speedup of optimization-based approach to local backlight dimming of HDR plays," Proc. SPIE Opt., Photon., Digital Technol. for Multimedia Appl. II (2012) pp. 84360B.
  11. S.-J. Kang, H. Ahn, H. Hong, E. Oh, I. Chung, Y. H. Kim, "Low power liquid crystal displays using an image integrity-based backlight dimming algorithm proposed backlight dimming method," SID Symp. Dig. Tech. Papers (2010) pp. 1005-1008.
  12. J. Korhonen, N. Burini, S. Forchhammer, J. Meldgaard Pedersen, "Modeling LCD displays with local backlight dimming for image quality assessment," Proc. SPIE Color Imag. XVI: Displaying, Process., Hardcopy, Appl. (2011) pp. 786607.
  13. N. Burini, "Modeling power-constrained optimal backlight dimming for color displays," J. Display Technol. 9, (2013).
  14. T-REC H.264: Advanced Video Coding for Generic Audiovisual Services ITU-T J.144ITU-Telecommun. Standardization (2004).
  15. Int. Standard IEC 62087-BD ed3.0: Methods of Measurement for the Power Consumption of Audio, Video and Related Equipment (2011).
  16. M. Albrecht, A. Karrenbauer, C. Xu, "A clipper-free algorithm for efficient HW-implementation of local dimming LED-backlight," Proc. 28th Int. Display Research Conf. (IDRC) (2008) pp. 286-289.
  17. Kodak True Color Image Suite (2007) http://r0k.us/graphics/kodak/.
  18. Consumer Digital Video Library (2010) http://www.cdvl.org Accessed date: Aug. 15, 2012.

2013 (1)

N. Burini, "Modeling power-constrained optimal backlight dimming for color displays," J. Display Technol. 9, (2013).

2012 (1)

X. Shu, X. Wu, S. Forchhammer, "Optimal local dimming for LC image formation with controllable backlighting," IEEE Trans. Image Process. 22, 166-173 (2012).

2011 (1)

2010 (1)

M. Albrecht, A. Karrenbauer, T. Jung, C. Xu, "Sorted sector covering combined with image condensation: An efficient method for local dimming of direct-lit and edge-lit LCDs," IEICE Trans. Electron. E93-C, 1556-1563 (2010).

2004 (1)

H. Seetzen, W. Heidrich, W. Stuerzlinger, G. Ward, L. Whitehead, M. Trentacoste, A. Ghosh, A. Vorozcovs, "High dynamic range display systems," ACM Trans. Graph. 23, 760-768 (2004).

ACM Trans. Graph. (1)

H. Seetzen, W. Heidrich, W. Stuerzlinger, G. Ward, L. Whitehead, M. Trentacoste, A. Ghosh, A. Vorozcovs, "High dynamic range display systems," ACM Trans. Graph. 23, 760-768 (2004).

IEEE Trans. Image Process. (1)

X. Shu, X. Wu, S. Forchhammer, "Optimal local dimming for LC image formation with controllable backlighting," IEEE Trans. Image Process. 22, 166-173 (2012).

IEICE Trans. Electron. (1)

M. Albrecht, A. Karrenbauer, T. Jung, C. Xu, "Sorted sector covering combined with image condensation: An efficient method for local dimming of direct-lit and edge-lit LCDs," IEICE Trans. Electron. E93-C, 1556-1563 (2010).

J. Display Technol. (2)

S.-J. Kang, Y. H. Kim, "Multi-histogram-based backlight dimming for low power liquid crystal displays," J. Display Technol. 7, 544-549 (2011).

N. Burini, "Modeling power-constrained optimal backlight dimming for color displays," J. Display Technol. 9, (2013).

Other (13)

T-REC H.264: Advanced Video Coding for Generic Audiovisual Services ITU-T J.144ITU-Telecommun. Standardization (2004).

Int. Standard IEC 62087-BD ed3.0: Methods of Measurement for the Power Consumption of Audio, Video and Related Equipment (2011).

M. Albrecht, A. Karrenbauer, C. Xu, "A clipper-free algorithm for efficient HW-implementation of local dimming LED-backlight," Proc. 28th Int. Display Research Conf. (IDRC) (2008) pp. 286-289.

Kodak True Color Image Suite (2007) http://r0k.us/graphics/kodak/.

Consumer Digital Video Library (2010) http://www.cdvl.org Accessed date: Aug. 15, 2012.

N. Burini, E. Nadernejad, J. Korhonen, S. Forchhammer, X. Wu, "Image dependent energy-constrained local backlight dimming," Proc. 19th IEEE Int. Conf. on Image Process. (2012) pp. 2797-2800.

N. Burini, E. Nadernejad, J. Korhonen, S. Forchhammer, X. Wu, "Speedup of optimization-based approach to local backlight dimming of HDR plays," Proc. SPIE Opt., Photon., Digital Technol. for Multimedia Appl. II (2012) pp. 84360B.

S.-J. Kang, H. Ahn, H. Hong, E. Oh, I. Chung, Y. H. Kim, "Low power liquid crystal displays using an image integrity-based backlight dimming algorithm proposed backlight dimming method," SID Symp. Dig. Tech. Papers (2010) pp. 1005-1008.

J. Korhonen, N. Burini, S. Forchhammer, J. Meldgaard Pedersen, "Modeling LCD displays with local backlight dimming for image quality assessment," Proc. SPIE Color Imag. XVI: Displaying, Process., Hardcopy, Appl. (2011) pp. 786607.

The European Commission“Implementing directive 2005/32/EC of the European Parliament and of the Council with regard to ecodesign requirements for televisions,” Official Journal of the European Union (2009) Accessed: Nov. 2012.

IEC“EU, Australia and US regulation on energy consumption in TV sets,” IEC 62087-2008 (2008) Accessed: 2010.

The European Commission“China Regulation on Energy Consumption in TV Sets,” GB 24850-2010 (2010) Accessed: 2011.

GfK Retail and Technology“International survey on the importance of the energy efficiency of TV appliances,” (2008) Accessed: 2012.

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