Abstract

A simple liquid crystal display (LCD) backlight unit (BLU) comprising only a single-sheet polydimethyl siloxane (PDMS) light-guide plate (LGP) has been developed. The PDMS LGP, having micropatterns with an inverse-trapezoidal cross section, was fabricated by backside 3-D diffuser lithography followed by PDMS-to-PDMS replication. The fabricated BLU showed an average luminance of 2878cdm2 with 73.3% uniformity when mounted in a 5.08cm backlight module with four side view 0.85cd LEDs. The developed BLU can greatly reduce the cost and thickness of LCDs, and it can be applied to flexible displays as a flexible light source due to the flexible characteristic of the PDMS itself.

© 2007 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]

2005 (2)

A. Nagasawa and K. Fujisawa, SID Int. Symp. Digest Tech. Papers 36, 570 (2005).
[CrossRef]

D. Feng, Y. Yan, K. Yang, G. Jin, and S. Fan, Pure Appl. Opt. 7, 111 (2005).
[CrossRef]

2004 (1)

2003 (1)

T. Okumura, A. Tagaya, and Y. Koike, Appl. Phys. Lett. 83, 2515 (2003).
[CrossRef]

2002 (1)

A. Tagaya, S. Ishii, K. Yokoyama, E. Higuchi, and Y. Koike, Jpn. J. Appl. Phys. 41, 2241 (2002).
[CrossRef]

2001 (1)

1999 (1)

S. Zimmerman, K. Beeson, M. McFarland, J. Wilson, T. J. Credelle, K. Bingaman, P. Ferm, and J. T. Yardley, SID Int. Symp. Digest Tech. Papers 30, 793 (1999).

Appl. Opt. (1)

Appl. Phys. Lett. (1)

T. Okumura, A. Tagaya, and Y. Koike, Appl. Phys. Lett. 83, 2515 (2003).
[CrossRef]

Jpn. J. Appl. Phys. (1)

A. Tagaya, S. Ishii, K. Yokoyama, E. Higuchi, and Y. Koike, Jpn. J. Appl. Phys. 41, 2241 (2002).
[CrossRef]

Opt. Express (1)

Pure Appl. Opt. (1)

D. Feng, Y. Yan, K. Yang, G. Jin, and S. Fan, Pure Appl. Opt. 7, 111 (2005).
[CrossRef]

SID Int. Symp. Digest Tech. Papers (2)

S. Zimmerman, K. Beeson, M. McFarland, J. Wilson, T. J. Credelle, K. Bingaman, P. Ferm, and J. T. Yardley, SID Int. Symp. Digest Tech. Papers 30, 793 (1999).

A. Nagasawa and K. Fujisawa, SID Int. Symp. Digest Tech. Papers 36, 570 (2005).
[CrossRef]

Other (2)

A. Nagasawa, T. Eguchi, Y. Sanai, and K. Fujisawa, in IDW'06: The 13th International Display Workshops (International Display Workshop, 2006), pp. 1285-1288.

H. Y. Choi, M. G. Lee, J. H. Min, and J. S. Choi, in Proceedings of the 8th International Display Workshop (International Display Workshop, 2001), pp. 20-23.

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Figures (5)

Fig. 1
Fig. 1

Proposed LCD BLU consisting of only a single-sheet PDMS LGP.

Fig. 2
Fig. 2

Fabrication procedure of the single-sheet PDMS LGP: (a) backside 3-D diffuser lithography [9], (b) photoresist micropatterns after development, (c) pouring of liquid PDMS onto the photoresist micropatterns and curing, (d) self-assembled monolayer coating on the replicated intermediate PDMS mold after peeling-off, (e) spin-coating PDMS onto the intermediate PDMS mold and curing, and (f) peeling-off the PDMS LGP from the intermediate PDMS.

Fig. 3
Fig. 3

Scanning electron microscopy photographs of (a) fabricated photoresist micropattern; (b) and (c) replicated micropattern in the intermediated PDMS mold and the final PDMS LGP, respectively; and (d) micropattern array in the final PDMS LGP.

Fig. 4
Fig. 4

Luminance characteristic of the fabricated PDMS LGP: (a) luminance value at 0° (upright direction) for each position, with and without a mirror at the far-end side from the LEDs; (b) luminance distribution at each point when the far-end side mirror is mounted; and (c) angular luminance distribution observed at the point 5 (center).

Fig. 5
Fig. 5

Photographs of (a) fabricated 300 μ m thick BLU, which is very thin and flexible, and (b) emanation of lights from the bent 500 μ m thick BLU when the side LEDs are on ( 1.29 MB ) .

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