Abstract

Conventional backlight dimming methods can hardly be used in edge type backlight LCD. In order to perform a power efficient backlight local dimming in LCD of mobile devices, a novel backlight module structure called partitioned light guide (PLG) was proposed. The PLG backlight module consists of independently controlled light sources, allowing the light luminance distribution to be controlled locally and efficiently. A PLG LCD prototype with white LEDs was built for evaluation. It was proved that local backlight dimming can be performed effectively in the edge type LCD. In addition, to compensate the backlight nonniformity which was caused by light leakage at the boundaries of PLG, an image distortion driven local dimming algorithm was proposed. Image distortion level of displayed image was selected by the user to determine how much compromise was made between power saving ratio and image quality. More simulations with RGB LED light sources showed the method can significantly improve the power efficiency of edge type backlight LCD, compared with global dimming method and SSC method.

© 2013 IEEE

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  1. M. H. Crawford, "LEDs for solid-state lighting: Performance challenges and recent advances," IEEE J. Sel. Topics Quantum Electron. 15, 1028-1040 (2009).
  2. N. Tansu, H. P. Zhao, G. Y. Liu, X. H. Li, J. Zhang, H. Tong, Y. K. Ee, "III-nitride photonics," IEEE Photon. J. 2, 241-248 (2010).
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  16. L. Q. Xue, J. H. Shi, "Dynamic segmentation for a side lit backlight system," Proc. ICACI'12 (2012) pp. 1145-1148.
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  22. N. Raman, G. Hekstra, "Content based contrast enhancement for liquid crystal displays with backlight modulation," IEEE Trans. Consumer Electron. 51, 18-21 (2005).
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2013 (2)

H. Cho, B. C. Cho, H. J. Hong, E. Y. 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).

G. Y. Liu, J. Zhang, C. K. Tan, N. Tansu, "Efficiency-droop suppression by using large-bandgap AlGaInN thin barrier layers in InGaN quantum wells light-emitting diodes," IEEE Photon. J. 5, 2201011 (2013).

2012 (3)

X. B. Zhang, R. Wang, D. Dong, J. H. Han, H. X. Wu, "Dynamic backlight adaptation based on the details of image for liquid crystal display," J. Display Technol. 8, 108-111 (2012).

F. C. Lin, Y. P. Huang, C. Y. Teng, H. D. Shieh, "Image saturation improvement for 180 Hz stencil-FSC LCD with side-lit LED backlight," J. of Display Technol. 8, 699-706 (2012).

S. Choi, M.-H. Ji, J. Kim, H. J. Kim, M. M. Satter, "Efficiency droop due to electron spill-over and limited hole injection in III-nitrid visible light-emitting diodes employing lattice-matched InAlN electron blocking layers," Appl. Phys. Lett. 101, 161110 (2012).

2010 (4)

J. J. Hong, S. E. Kim, W. J. Song, "A clipping reduction algorithmusing backlight luminance compensation for local-dimming liquid crystal displays," IEEE Trans. Consumer Electron. 56, 240-247 (2010).

H. P. Zhao, G. Y. Liu, J. Zhang, J. D. Poplawsky, V. Dierolf, N. Tansu, "Approaches for high internal quantum efficiency green InGaN light-emitting diodes with large overlap quantum wells," Opt. Express 19, A1991-A1007 (2010).

H. Cho, O. Kwon, "A local dimming algorithm for low power LCD TVs using edge-type LED backlight," IEEE Trans. Consumer Electron. 56, 2054-2060 (2010).

N. Tansu, H. P. Zhao, G. Y. Liu, X. H. Li, J. Zhang, H. Tong, Y. K. Ee, "III-nitride photonics," IEEE Photon. J. 2, 241-248 (2010).

2009 (3)

T. Lee, J. Lee, C. Kim, S. Kang, "An optical feedback system for local dimming backlight with RGB LEDs," IEEE Trans. Consumer Electron. 55, 2178-2183 (2009).

M. H. Crawford, "LEDs for solid-state lighting: Performance challenges and recent advances," IEEE J. Sel. Topics Quantum Electron. 15, 1028-1040 (2009).

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

2008 (2)

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

F. C. Lin, Y. P. Huang, L. Y. Liao, C. Y. Liao, H. P. Shieh, T. M. Wang, S. C. Yeh, "Dynamic backlight gamma on high dynamic range LCD TVs," J. Display Technol. 4, 139-146 (2008).

2006 (1)

L. Kerofsky, S. Daly, "Brightness preservation for LCD backlight dimming," J. SID 14, 1111-1118 (2006).

2005 (1)

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

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. Graphics 23, 760-768 (2004).

ACM Trans. Graphics (1)

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

Appl. Phys. Lett. (1)

S. Choi, M.-H. Ji, J. Kim, H. J. Kim, M. M. Satter, "Efficiency droop due to electron spill-over and limited hole injection in III-nitrid visible light-emitting diodes employing lattice-matched InAlN electron blocking layers," Appl. Phys. Lett. 101, 161110 (2012).

IEEE J. Sel. Topics Quantum Electron. (1)

M. H. Crawford, "LEDs for solid-state lighting: Performance challenges and recent advances," IEEE J. Sel. Topics Quantum Electron. 15, 1028-1040 (2009).

IEEE Trans. Consumer Electron. (3)

H. Cho, O.-K. 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. Hekstra, "Content based contrast enhancement for liquid crystal displays with backlight modulation," IEEE Trans. Consumer Electron. 51, 18-21 (2005).

H. Cho, O. Kwon, "A local dimming algorithm for low power LCD TVs using edge-type LED backlight," IEEE Trans. Consumer Electron. 56, 2054-2060 (2010).

IEEE Photon. J. (2)

G. Y. Liu, J. Zhang, C. K. Tan, N. Tansu, "Efficiency-droop suppression by using large-bandgap AlGaInN thin barrier layers in InGaN quantum wells light-emitting diodes," IEEE Photon. J. 5, 2201011 (2013).

N. Tansu, H. P. Zhao, G. Y. Liu, X. H. Li, J. Zhang, H. Tong, Y. K. Ee, "III-nitride photonics," IEEE Photon. J. 2, 241-248 (2010).

IEEE Trans. Consumer Electron. (3)

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

T. Lee, J. Lee, C. Kim, S. Kang, "An optical feedback system for local dimming backlight with RGB LEDs," IEEE Trans. Consumer Electron. 55, 2178-2183 (2009).

J. J. Hong, S. E. Kim, W. J. Song, "A clipping reduction algorithmusing backlight luminance compensation for local-dimming liquid crystal displays," IEEE Trans. Consumer Electron. 56, 240-247 (2010).

J. Display Technol. (2)

J. of Display Technol. (1)

F. C. Lin, Y. P. Huang, C. Y. Teng, H. D. Shieh, "Image saturation improvement for 180 Hz stencil-FSC LCD with side-lit LED backlight," J. of Display Technol. 8, 699-706 (2012).

J. SID (1)

L. Kerofsky, S. Daly, "Brightness preservation for LCD backlight dimming," J. SID 14, 1111-1118 (2006).

Opt. Laser Technol. (1)

H. Cho, B. C. Cho, H. J. Hong, E. Y. 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).

Opt. Express (1)

H. P. Zhao, G. Y. Liu, J. Zhang, J. D. Poplawsky, V. Dierolf, N. Tansu, "Approaches for high internal quantum efficiency green InGaN light-emitting diodes with large overlap quantum wells," Opt. Express 19, A1991-A1007 (2010).

Other (6)

L. Q. Xue, J. H. Shi, "Dynamic segmentation for a side lit backlight system," Proc. ICACI'12 (2012) pp. 1145-1148.

J. An, S. Kim, W. Song, T. Lee, C. Kim, "Adaptive local dimming backlight for liquid-crystal displays," Proc. Int. Display Workshop (2008) pp. 285-288.

Y. Yoshida, K. Otoi, T. Mori, K. Tomizawa, "53.1: Invited paper: Recent trend of LED backlight with local dimming and its application for multi-primary-color displays," SID Symp. Dig. Tech. Papers (2011) pp. 773-776.

T. Jung, M. Albrecht, C. Xu, A. Karrenbauer, "Application of the SSC local dimming algorithm for an edge-lit TV," SID'10 Dig. (2010) pp. 1450-1453.

C. Y. Liao, F. C. Lin, L. Y. Liao, Y. P. Huang, H. P. Shieh, "Inverse of mapping function method for image quality enhancement of high dynamic range LCD TVs," SID'07 Dig. (2007) pp. 1343-1346.

T. Funamoto, T. Kobayashi, T. Murao, "High-picture-quality technique for LCD television: LCD-AI," Proc. IDW'00 (2000) pp. 1157-1158.

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