Abstract

In this paper, we propose an advanced backlight dimming technique that preserves the quality of color and details in images even when the backlight luminance of liquid crystal display (LCD) devices is lowered. The proposed backlight dimming technique consists of the following two steps: backlight luminance level selection and pixel compensation. In the first step, to reduce power consumption, the proposed approach selects an optimal level of backlight luminance for a given image based on image quality evaluation that considers the peak signal-to-noise ratio (PSNR) and color distortion level. In the second step, it adaptively adjusts the RGB ratio depending on image details, thereby enhancing image color and details, which are degraded by the lowered backlight luminance level calculated in the first step. The simulation results showed that the proposed method successfully selected the optimal backlight luminance level and prevented severe color distortion, while the benchmark method induced severe color distortion in some images. In addition, for the same backlight luminance level, pixel compensation in the proposed method reduced color difference for color distortion evaluation and the loss rate of edge strength, which showed detail loss by up to 3.58% and 40.55%, compared to benchmark methods, respectively.

© 2013 IEEE

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2013 (1)

H. Cho, B. Cho, H. Hong, E. Oh, O. Kwon, "A color local dimming algorithm for liquid crystals displays using color light emitting diode backlight systems," Opt. Laser Technol. 47, 80-87 (2013).

2012 (1)

2011 (1)

2010 (1)

J. Hong, S. Kim, W. Song, "A clipping reduction algorithm using backlight luminance compensation for local dimming liquid crystal displays," IEEE Trans. Consumer Electron. 56, 240-246 (2010).

2009 (5)

S. Kang, Y. Kim, "Image integrity-based gray-level error control for low power liquid crystal displays," IEEE Trans. Consumer Electron. 55, 2401-2406 (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).

P. Tsai, C. Liang, T. Huang, H. H. Chen, "Image enhancement for backlight-scaled TFT-LCD displays," IEEE Trans. Circuits Syst. Video Technol. 19, 574-583 (2009).

D. V. Rao, L. P. Reddy, "Weighted structural similarity based on edge strength for image quality assessment," IJCTE 1, 136-139 (2009).

Y. Jin, J. Kim, H.-J. Lee, "Reduction of quantization errors caused by dynamic LCD backlight scaling," IEICE Electron. Express 6, 535-539 (2009).

2006 (1)

L. Kerofsky, S. Daly, "Brightness preservation for LCD backlight dimming," J. SID 16, 1111-1118 (2006).

2004 (1)

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

2002 (1)

G. Marchionini, G. Geisler, "The open video digital library," Digital Library Mag. 8, (2002).

1978 (1)

Y. Perl, A. Itai, H. Avni, "Interpolation search—A loglogN search," Commun. ACM 21, 550-554 (1978).

Commun. ACM (1)

Y. Perl, A. Itai, H. Avni, "Interpolation search—A loglogN search," Commun. ACM 21, 550-554 (1978).

Digital Library Mag. (1)

G. Marchionini, G. Geisler, "The open video digital library," Digital Library Mag. 8, (2002).

IEEE Trans. Circuits Syst. Video Technol. (1)

P. Tsai, C. Liang, T. Huang, H. H. Chen, "Image enhancement for backlight-scaled TFT-LCD displays," IEEE Trans. Circuits Syst. Video Technol. 19, 574-583 (2009).

IEEE Trans. Consumer Electron. (3)

S. Kang, Y. Kim, "Image integrity-based gray-level error control for low power liquid crystal displays," IEEE Trans. Consumer Electron. 55, 2401-2406 (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).

J. Hong, S. Kim, W. Song, "A clipping reduction algorithm using backlight luminance compensation for local dimming liquid crystal displays," IEEE Trans. Consumer Electron. 56, 240-246 (2010).

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

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

IEICE Electron. Express (1)

Y. Jin, J. Kim, H.-J. Lee, "Reduction of quantization errors caused by dynamic LCD backlight scaling," IEICE Electron. Express 6, 535-539 (2009).

IJCTE (1)

D. V. Rao, L. P. Reddy, "Weighted structural similarity based on edge strength for image quality assessment," IJCTE 1, 136-139 (2009).

J. Display Technol. (2)

J. SID (1)

L. Kerofsky, S. Daly, "Brightness preservation for LCD backlight dimming," J. SID 16, 1111-1118 (2006).

Opt. Laser Technol. (1)

H. Cho, B. Cho, H. Hong, E. Oh, O. Kwon, "A color local dimming algorithm for liquid crystals displays using color light emitting diode backlight systems," Opt. Laser Technol. 47, 80-87 (2013).

Other (9)

R. C. Gonzales, R. E. Woods, Digital Image Processing (Prentice Hall, 2007).

Z. Wang, A. C. Bovik, Modern Image Quality Assessment (Morgan & Claypool Publishers, 2006).

E. Reinhard, W. Heidrich, P. Debevec, S. Pattanaik, G. Ward, K. Myszkowski, High Dynamic Range Imaging: Acquisition, Display, and Image-Based Lighting (Morgan Kaufmann, 2010).

KodakKodak Lossless True Color Image Suite (1999) http://r0k.us/graphics/kodak/.

H. Chen, J. Sung, T. Ha, Y. Park, C. Hong, "Backlight local dimming algorithm for high contrast LCD-TV," Proc. ASID (2006) pp. 168-171.

H. Chen, J. Sung, T. Ha, Y. Park, "Locally pixel-compensated backlight dimming for improving static contrast on LED backlit LCDs," SID 07 Dig. (2007) pp. 1339-1342.

I. Choi, H. Shim, N. Chang, "Low-power color TFT LCD display for hand-held embedded systems," Proc. Int. Symp. Low-Power Electron. Des. (2002) pp. 112-117.

W. Fu, X. Gu, Y. Wang, "Image quality assessment using edge and contrast similarity," Int. Joint Conf. on Neural Netw. (2008) pp. 852-855.

R. C. Gonzales, R. E. Woods, Digital Image Processing (Prentice Hall, 2010).

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