Abstract

A high efficiency LCD employing a color-matching backlight system that consists of a collimation lenticular lens sheet, a blazed grating, and a focusing lenticular lens array is proposed and analyzed. The RGB lights that are collimated and dispersed from the collimation lenticular lens sheet and the blazed grating are incident on the RGB color filters by the focusing lenticular lens array. The color-matched transmittance was increased 183% and 121% for divergence angles of 2° and 11°, respectively, compared to a conventional backlight that does not use a blazed grating. The design, simulation, and experimental results for the prototype color-matching backlight system are presented.

© 2012 Optical Society of America

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References

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2011 (1)

2010 (1)

J. H. Kwon, “A color-filterless LCD with RGB LED and lenticular-lens arrays,” J. Info. Display 11, 45–48 (2010).
[CrossRef]

2009 (1)

2008 (1)

M. J. J. Jak, R. Caputo, E. J. Hornix, L. de Sio, D. K. G. de Boer, and H. J. Cornelissen, “Color-separating backlight for improved LCD efficiency,” J. Soc. Inf. Disp. 16, 803–810 (2008).
[CrossRef]

2007 (1)

2006 (1)

A. Audran, B. Faure, B. Mortini, J. Regolini, G. Schlatter, and G. Hadziioannou, “Study of mechanisms involved in photoresist mircolens formation,” Microelectron. Eng. 83, 1087–1090 (2006).
[CrossRef]

2005 (1)

J. H. Ko, “Recent research trends in the development of new light source for the backlight unit of liquid crystal display,” Asian J. Phys. 14, 231–237 (2005).

2004 (1)

L. J. Guo, “Recent progress in nanoimprint technology and its applications,” J. Phys. D 37, 123–141 (2004).
[CrossRef]

2003 (1)

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

1977 (1)

Audran, A.

A. Audran, B. Faure, B. Mortini, J. Regolini, G. Schlatter, and G. Hadziioannou, “Study of mechanisms involved in photoresist mircolens formation,” Microelectron. Eng. 83, 1087–1090 (2006).
[CrossRef]

Caputo, R.

M. J. J. Jak, R. Caputo, E. J. Hornix, L. de Sio, D. K. G. de Boer, and H. J. Cornelissen, “Color-separating backlight for improved LCD efficiency,” J. Soc. Inf. Disp. 16, 803–810 (2008).
[CrossRef]

Castellano, J. A.

J. A. Castellano, Handbook of Display Technology (Academic, 1992).

Chen, C.-H.

Chung, K.-Y.

Colgan, E. G.

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Cornelissen, H. J.

M. J. J. Jak, R. Caputo, E. J. Hornix, L. de Sio, D. K. G. de Boer, and H. J. Cornelissen, “Color-separating backlight for improved LCD efficiency,” J. Soc. Inf. Disp. 16, 803–810 (2008).
[CrossRef]

de Boer, D. K. G.

M. J. J. Jak, R. Caputo, E. J. Hornix, L. de Sio, D. K. G. de Boer, and H. J. Cornelissen, “Color-separating backlight for improved LCD efficiency,” J. Soc. Inf. Disp. 16, 803–810 (2008).
[CrossRef]

de Sio, L.

M. J. J. Jak, R. Caputo, E. J. Hornix, L. de Sio, D. K. G. de Boer, and H. J. Cornelissen, “Color-separating backlight for improved LCD efficiency,” J. Soc. Inf. Disp. 16, 803–810 (2008).
[CrossRef]

Faure, B.

A. Audran, B. Faure, B. Mortini, J. Regolini, G. Schlatter, and G. Hadziioannou, “Study of mechanisms involved in photoresist mircolens formation,” Microelectron. Eng. 83, 1087–1090 (2006).
[CrossRef]

Guo, L. J.

L. J. Guo, “Recent progress in nanoimprint technology and its applications,” J. Phys. D 37, 123–141 (2004).
[CrossRef]

Gwag, J. S.

Hadziioannou, G.

A. Audran, B. Faure, B. Mortini, J. Regolini, G. Schlatter, and G. Hadziioannou, “Study of mechanisms involved in photoresist mircolens formation,” Microelectron. Eng. 83, 1087–1090 (2006).
[CrossRef]

Hornix, E. J.

M. J. J. Jak, R. Caputo, E. J. Hornix, L. de Sio, D. K. G. de Boer, and H. J. Cornelissen, “Color-separating backlight for improved LCD efficiency,” J. Soc. Inf. Disp. 16, 803–810 (2008).
[CrossRef]

Hsu, Y.-T.

Huang, Y.-P.

Jak, M. J. J.

M. J. J. Jak, R. Caputo, E. J. Hornix, L. de Sio, D. K. G. de Boer, and H. J. Cornelissen, “Color-separating backlight for improved LCD efficiency,” J. Soc. Inf. Disp. 16, 803–810 (2008).
[CrossRef]

Kim, I.-K.

Ko, J. H.

J. H. Ko, “Recent research trends in the development of new light source for the backlight unit of liquid crystal display,” Asian J. Phys. 14, 231–237 (2005).

Kobayashi, S.

S. Kobayashi, S. Mikoshiba, and S. K. Lim, LCD Backlights (Wiley, 2009).

Kwon, J. H.

Lim, S. K.

S. Kobayashi, S. Mikoshiba, and S. K. Lim, LCD Backlights (Wiley, 2009).

Lin, F.-C.

Loewen, E. G.

Maystre, D.

Mikoshiba, S.

S. Kobayashi, S. Mikoshiba, and S. K. Lim, LCD Backlights (Wiley, 2009).

Mortini, B.

A. Audran, B. Faure, B. Mortini, J. Regolini, G. Schlatter, and G. Hadziioannou, “Study of mechanisms involved in photoresist mircolens formation,” Microelectron. Eng. 83, 1087–1090 (2006).
[CrossRef]

Munro, J. F.

J. F. Munro, “Collimating microlens array,” U.S. patent 7,706,073 (27April2007).

Nakano, D.

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Neviere, M.

Noguchi, M.

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Numata, H.

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Regolini, J.

A. Audran, B. Faure, B. Mortini, J. Regolini, G. Schlatter, and G. Hadziioannou, “Study of mechanisms involved in photoresist mircolens formation,” Microelectron. Eng. 83, 1087–1090 (2006).
[CrossRef]

Schlatter, G.

A. Audran, B. Faure, B. Mortini, J. Regolini, G. Schlatter, and G. Hadziioannou, “Study of mechanisms involved in photoresist mircolens formation,” Microelectron. Eng. 83, 1087–1090 (2006).
[CrossRef]

Shieh, H.-P. D.

Singh, R.

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Son, C. G.

Sueoka, K.

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Suzuki, M.

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Taira, Y.

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Yamada, F.

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Yi, J. H.

Appl. Opt. (1)

Asian J. Phys. (1)

J. H. Ko, “Recent research trends in the development of new light source for the backlight unit of liquid crystal display,” Asian J. Phys. 14, 231–237 (2005).

J. Display Technol. (1)

J. Info. Display (1)

J. H. Kwon, “A color-filterless LCD with RGB LED and lenticular-lens arrays,” J. Info. Display 11, 45–48 (2010).
[CrossRef]

J. Opt. Soc. Korea (2)

J. Phys. D (1)

L. J. Guo, “Recent progress in nanoimprint technology and its applications,” J. Phys. D 37, 123–141 (2004).
[CrossRef]

J. Soc. Inf. Disp. (1)

M. J. J. Jak, R. Caputo, E. J. Hornix, L. de Sio, D. K. G. de Boer, and H. J. Cornelissen, “Color-separating backlight for improved LCD efficiency,” J. Soc. Inf. Disp. 16, 803–810 (2008).
[CrossRef]

Microelectron. Eng. (1)

A. Audran, B. Faure, B. Mortini, J. Regolini, G. Schlatter, and G. Hadziioannou, “Study of mechanisms involved in photoresist mircolens formation,” Microelectron. Eng. 83, 1087–1090 (2006).
[CrossRef]

SID Symp. Dig. Tech. Papers (1)

Y. Taira, H. Numata, D. Nakano, K. Sueoka, F. Yamada, M. Suzuki, M. Noguchi, R. Singh, and E. G. Colgan, “Color filterless liquid crystal display illuminated with LEDs,” SID Symp. Dig. Tech. Papers 34, 1250–1253 (2003).
[CrossRef]

Other (3)

J. A. Castellano, Handbook of Display Technology (Academic, 1992).

S. Kobayashi, S. Mikoshiba, and S. K. Lim, LCD Backlights (Wiley, 2009).

J. F. Munro, “Collimating microlens array,” U.S. patent 7,706,073 (27April2007).

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Figures (7)

Fig. 1.
Fig. 1.

Schematic structure of the spectral backlight system with the collimation lenticular lens sheet, the blazed grating, and the focusing lenticular lens array, which are placed on top of the conventional LGP. LGP, light guide panel; LC, liquid crystal; CF, color filter.

Fig. 2.
Fig. 2.

Schematic optical layout of the collimation lenticular lens sheet, the blazed grating, and the focusing lenticular lens array.

Fig. 3.
Fig. 3.

Transmittance and divergence angle of the collimation lenticular lens sheet in terms of the slit width. The surface reflectivity was assumed to be 98%.

Fig. 4.
Fig. 4.

(a) Transmittance enhancement and (b) the focal length of the focusing lenticular lens in terms of the grating pitch.

Fig. 5.
Fig. 5.

(a) Confocal microscope image and (b) the depth profile of the blazed grating.

Fig. 6.
Fig. 6.

Comparison of the angular luminance profiles between the conventional edge-lit BLU (squares) and the collimation lenticular lens sheet placed on top of the conventional LGP (circles).

Fig. 7.
Fig. 7.

Transmitted power of the color-matching BLU in terms of the position of the CF. A and B designate the color-matched and noncolor-matched positions, respectively.

Equations (8)

Equations on this page are rendered with MathJax. Learn more.

Tc=δ1(1δ)Rsr,
β=Δλd=W3f,
f=Wd3Δλ,
R=f2=Wd6Δλ.
h2=W2/(8R).
Ea=δα=Δλαd.
TCM=η(EcEgEa+(1Eg)/3)TCF,
e=TCMTC=3η(EcEgEa+(1E2)/3),

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