Abstract

Light-guide plates (LGPs) with aperiodic or size-varied microstructures are widely used in edge-lit light-source backlight systems for their high uniformity. In this Letter we designed a LGP with periodic and single-sized microstructures and analyzed the relationship between the holistic arrangement density of the microstructures and the uniformity. By controlling the holistic arrangement density of the microstructures, the uniformity could also be increased.

© 2012 Optical Society of America

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References

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  1. S. Kobayashi, S. Mikoshiba, and S. Lim, LCD Backlights (Wiley, 2009).
  2. J. G. Chang and Y. B. Fang, Opt. Eng. 46, 043002 (2007).
    [CrossRef]
  3. J. H. Lee and J. B. Yoon, SID J. 38, 465 (2007).
    [CrossRef]
  4. K. Käläntär, S. Cho, and H. O. Shi, SID J. 20, 133 (2011).
  5. C. H. Chien, and Z. P. Chen, J. Microlithogr. Microfabr. Microsyst. 5, 043011 (2006).
    [CrossRef]
  6. C. H. Chen, Y. C. Yeh, and H. P. D. Shieh, J. Disp. Technol. 4, 92 (2008).
    [CrossRef]
  7. J. W. Pan and C. W. Fan, Opt. Express 19, 20079 (2011).
    [CrossRef]
  8. J. H. Lee, H. S. Lee, B. K. Lee, W. S. Choi, H. Y. Choi, and J. B. Yoon, Opt. Lett. 32, 2665 (2007).
    [CrossRef]
  9. American National Standards Institute (ANSI) IT7.215-1992, http://www.ansi.org .
  10. Optical Research Associates (ORA), http://www.opticalres.com .
  11. Nichia NESW155T, http://www.nichia.co.jp/specification/en/product/led_library/NESW155T-E.pdf .
  12. National Center for High-Performance Computing, http://www.nchc.org.tw/en/ .

2011 (2)

K. Käläntär, S. Cho, and H. O. Shi, SID J. 20, 133 (2011).

J. W. Pan and C. W. Fan, Opt. Express 19, 20079 (2011).
[CrossRef]

2008 (1)

C. H. Chen, Y. C. Yeh, and H. P. D. Shieh, J. Disp. Technol. 4, 92 (2008).
[CrossRef]

2007 (3)

J. H. Lee, H. S. Lee, B. K. Lee, W. S. Choi, H. Y. Choi, and J. B. Yoon, Opt. Lett. 32, 2665 (2007).
[CrossRef]

J. G. Chang and Y. B. Fang, Opt. Eng. 46, 043002 (2007).
[CrossRef]

J. H. Lee and J. B. Yoon, SID J. 38, 465 (2007).
[CrossRef]

2006 (1)

C. H. Chien, and Z. P. Chen, J. Microlithogr. Microfabr. Microsyst. 5, 043011 (2006).
[CrossRef]

Chang, J. G.

J. G. Chang and Y. B. Fang, Opt. Eng. 46, 043002 (2007).
[CrossRef]

Chen, C. H.

C. H. Chen, Y. C. Yeh, and H. P. D. Shieh, J. Disp. Technol. 4, 92 (2008).
[CrossRef]

Chen, Z. P.

C. H. Chien, and Z. P. Chen, J. Microlithogr. Microfabr. Microsyst. 5, 043011 (2006).
[CrossRef]

Chien, C. H.

C. H. Chien, and Z. P. Chen, J. Microlithogr. Microfabr. Microsyst. 5, 043011 (2006).
[CrossRef]

Cho, S.

K. Käläntär, S. Cho, and H. O. Shi, SID J. 20, 133 (2011).

Choi, H. Y.

Choi, W. S.

Fan, C. W.

Fang, Y. B.

J. G. Chang and Y. B. Fang, Opt. Eng. 46, 043002 (2007).
[CrossRef]

Käläntär, K.

K. Käläntär, S. Cho, and H. O. Shi, SID J. 20, 133 (2011).

Kobayashi, S.

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

Lee, B. K.

Lee, H. S.

Lee, J. H.

Lim, S.

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

Mikoshiba, S.

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

Pan, J. W.

Shi, H. O.

K. Käläntär, S. Cho, and H. O. Shi, SID J. 20, 133 (2011).

Shieh, H. P. D.

C. H. Chen, Y. C. Yeh, and H. P. D. Shieh, J. Disp. Technol. 4, 92 (2008).
[CrossRef]

Yeh, Y. C.

C. H. Chen, Y. C. Yeh, and H. P. D. Shieh, J. Disp. Technol. 4, 92 (2008).
[CrossRef]

Yoon, J. B.

J. Disp. Technol. (1)

C. H. Chen, Y. C. Yeh, and H. P. D. Shieh, J. Disp. Technol. 4, 92 (2008).
[CrossRef]

J. Microlithogr. Microfabr. Microsyst. (1)

C. H. Chien, and Z. P. Chen, J. Microlithogr. Microfabr. Microsyst. 5, 043011 (2006).
[CrossRef]

Opt. Eng. (1)

J. G. Chang and Y. B. Fang, Opt. Eng. 46, 043002 (2007).
[CrossRef]

Opt. Express (1)

Opt. Lett. (1)

SID J. (2)

J. H. Lee and J. B. Yoon, SID J. 38, 465 (2007).
[CrossRef]

K. Käläntär, S. Cho, and H. O. Shi, SID J. 20, 133 (2011).

Other (5)

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

American National Standards Institute (ANSI) IT7.215-1992, http://www.ansi.org .

Optical Research Associates (ORA), http://www.opticalres.com .

Nichia NESW155T, http://www.nichia.co.jp/specification/en/product/led_library/NESW155T-E.pdf .

National Center for High-Performance Computing, http://www.nchc.org.tw/en/ .

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Figures (6)

Fig. 1.
Fig. 1.

LGP with single-sized cylindrical and periodic microstructures: (a) rays strike the microstructures and then escape the LGP and (b) remaining rays are guided in the LGP by the TIR.

Fig. 2.
Fig. 2.

(a) Proposed LGP composed of m elements and (b) structure of each element.

Fig. 3.
Fig. 3.

(a) We define the probabilities of rays striking the top and the bottom surface as Pt and Pb (b) and the proportion of the microstructures’ bottom area (a) accounting for the area of the whole top surface (A) as Pa.

Fig. 4.
Fig. 4.

Schematic diagram of En.

Fig. 5.
Fig. 5.

Principle for averaging En in each element.

Fig. 6.
Fig. 6.

Relationship between the light extraction probability (P), the uniformity (U), and the optical efficiency under different reflectivity values (R) for the theoretical and the simulated values.

Equations (7)

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P=Pt×Pa,
E1=P×S1.
S2=S1E1=S1P×S1=(1P)×S1.
E2=P×S2=P×(1P)×S1.
En=P×(1P)n1,1nm.
En=P×(1P)n1×S1+R×P×(1P)2mn×S1.
U=P×(1P)0.9m1×S1+R×P×(1P)1.1m×S1P×(1P)0.1m1×S1+R×P×(1P)1.9m×S1=(1P)0.9m1+R×(1P)1.1m(1P)0.1m1+R×(1P)1.9m.

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