Abstract

A new optical film is proposed to reduce angular color shifts of liquid crystal displays (LCDs). The film is composed of microstructures to induce the angular light mixing by deflection and reflection at the microstructure surfaces. A simulation scheme was developed to predict color shifts based on geometrical optics, and applied to design and optimize the microstructures. Among various microstructures studied, parallel grooves with parabolic cross sections were found to be the most efficient in redistributing light. Experimental verification by the UV micro-imprinting method were conducted to show the new film design can reduce the angular shifts by 50% or more for 13 primary and secondary colors of a super-patterned vertical alignment (S-PVA) LCD, and greatly reduce the grey inversion of twisted nematic (TN) LCDs as well.

© 2012 IEEE

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2009

S.-H. Ji, J. W. Moon, B. Kang, G.-D. Lee, S. H. Lee, "Improvement of color shift and viewing angle in the vertical alignment liquid crystal cell," J. Kor. Phys. Soc. 55, 1478-1482 (2009).

M. Jiao, Z. Ge, S.-T. Wu, "Broadband wide-view LCDs with small color shift," J. Display. Technol. 5, 331-334 (2009).

K. Teunissen, X. Zhong, T. Chen, I. Heynderickx, "A new characterization method to define the viewing angle range of matrix displays," Displays 30, 77-83 (2009).

J. Ma, Y.-C. Yang, Z. Zheng, J. Shi, W. Cao, "A multi-domain vertical alignment liquid crystal display to improve the V-T property," Displays 30, 185-189 (2009).

2008

R. Lu, X. Nie, S.-T. Wu, "Color performance of an MVA-LCD using an LED backlight," J. Soc. Inf. Display 16, 1139-1145 (2008).

R. Lu, S.-T. Wu, S. H. Lee, "Reducing the color shift of a multidomain vertical alignment liquid crystal display using dual threshold voltages," Appl. Phys. Lett. 92, 051114 (2008).

2006

2005

V. V. Saveljev, J.-Y. Son, B. Javidi, S.-K. Kim, D.-S. Kim, "Moiré minimization condition in three-dimensional image displays," J. Display Technol. 1, 347 (2005).

2003

D. S. Lee, S.-S. Min, M. S. Lee, "Design and analysis of spatially variant microlens-array diffuser with uniform illumination for short-range infrared wireless communications using photometric approach," Opt. Commun. 219, 49-55 (2003).

1995

S. Wadle, R. S. Lakes, "Holographic diffusers with low back-scatter," J. Modern Optics 42, 1387-1396 (1995).

Appl. Phys. Lett.

R. Lu, S.-T. Wu, S. H. Lee, "Reducing the color shift of a multidomain vertical alignment liquid crystal display using dual threshold voltages," Appl. Phys. Lett. 92, 051114 (2008).

S. Ahn, J. Cha, H. Myung, S.-M. Kim, S. Kang, "Continuous ultraviolet roll nanoimprinting process for replicating large-scale nano- and micro-patterns," Appl. Phys. Lett. 89, 213101 (2006).

Displays

J. Ma, Y.-C. Yang, Z. Zheng, J. Shi, W. Cao, "A multi-domain vertical alignment liquid crystal display to improve the V-T property," Displays 30, 185-189 (2009).

K. Teunissen, X. Zhong, T. Chen, I. Heynderickx, "A new characterization method to define the viewing angle range of matrix displays," Displays 30, 77-83 (2009).

J. Kor. Phys. Soc.

S.-H. Ji, J. W. Moon, B. Kang, G.-D. Lee, S. H. Lee, "Improvement of color shift and viewing angle in the vertical alignment liquid crystal cell," J. Kor. Phys. Soc. 55, 1478-1482 (2009).

J. Display Technol.

V. V. Saveljev, J.-Y. Son, B. Javidi, S.-K. Kim, D.-S. Kim, "Moiré minimization condition in three-dimensional image displays," J. Display Technol. 1, 347 (2005).

J. Display. Technol.

M. Jiao, Z. Ge, S.-T. Wu, "Broadband wide-view LCDs with small color shift," J. Display. Technol. 5, 331-334 (2009).

J. Modern Optics

S. Wadle, R. S. Lakes, "Holographic diffusers with low back-scatter," J. Modern Optics 42, 1387-1396 (1995).

J. Soc. Inf. Display

R. Lu, X. Nie, S.-T. Wu, "Color performance of an MVA-LCD using an LED backlight," J. Soc. Inf. Display 16, 1139-1145 (2008).

Opt. Commun.

D. S. Lee, S.-S. Min, M. S. Lee, "Design and analysis of spatially variant microlens-array diffuser with uniform illumination for short-range infrared wireless communications using photometric approach," Opt. Commun. 219, 49-55 (2003).

Opt. Express

Opt. Lett.

Other

J.-Y. Son, V. Saveljev, S.-H. Shin, Y.-J. Choi, S.-S. Kim, "Moire pattern reduction in full-parallax autostereoscopic imaging systems using two crossed lenticular plates as a viewing zone forming optics," Proc. 10th IDW (2003) pp. 1401-1404.

H. Yoshida, T. Kamada, K. Ueda, R. Tanaka, Y. Koike, K. Okamoto, P. L. Chen, J. Lin, "Multi-domain vertically aligned LCDs with super-wide viewing range for gay-scale images," Asia Display/IMID'04 12-2 (2004) pp. 1-4.

A. Geivandov, A. Lazarev, A. Manko, S. Palto, "Advanced wideband coatable LCD retarder with anomalous dispersion of optical anisotropy," IDW'08 (2008) pp. 739-742.

N. Matsunaga, I. Fujiwara, J. Watanabe, T. Ando, K. Miyazaki, T. Ito, "New front surface film for improving the viewing-angle properties of TN-mode TFT-LCDs," SID 07 Dig. (2007) pp. 1559.

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