Abstract

An LED backlight has been designed using the flow-line design method. This method allows a very efficient control of the light extraction. The light is confined inside the guide by total internal reflection, being extracted only by specially calculated surfaces: the ejectors. Backlight designs presented here have a total optical efficiency of up to 80% (including Fresnel and absorption losses) with an FWHM below 30 degrees. The experimental results of the first prototype are shown.

© 2011 OSA

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References

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  1. J. C. Miñano, P. Benítez, J. Chaves, M. Hernández, O. Dross, and A. Santamaría, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202, 594202-12 (2005).
    [CrossRef]
  2. D. Feng, G. Jin, Y. Yan, and S. Fan, “High quality light guide plates that can control the illumination angle based on microprism structures,” Appl. Phys. Lett. 85(24), 6016–6018 (2004).
    [CrossRef]
  3. D. Feng, Y. Yan, X. Yang, G. Jin, and S. Fan, “Novel integrated light-guide plate for liquid crystal display backlight,” J. Opt. A, Pure Appl. Opt. 7(3), 111–117 (2005).
    [CrossRef]
  4. H. Tanase, J. Mamiya, and M. Suzuki, “A new backlighting system using a polarizing light pipe,” IBM J. Res. Develop. 42(3), 527–536 (1998).
    [CrossRef]
  5. N. Guselnikov, P. Lazarev, M. Paukshto, and P. Yeh, “Translucent LCDs,” J. Soc. Inf. Disp. 13(4), 339–348 (2005).
    [CrossRef]
  6. S. R. Park, O. J. Kwon, D. Shin, S. H. Song, H. S. Lee, and H. Y. Choi, “Grating micro-dot patterned light guide plates for LED backlights,” Opt. Express 15(6), 2888–2899 (2007).
    [CrossRef] [PubMed]
  7. W. J. Cassarly, “Backlight pattern optimization,” Proc. SPIE 6834, 683407, 683407-12 (2007).
    [CrossRef]
  8. K. Imai and I. Fujieda, “Illumination uniformity of an edge-lit backlight with emission angle control,” Opt. Express 16(16), 11969–11974 (2008).
    [CrossRef] [PubMed]
  9. R. Winston, J. C. Miñano, and P. Benítez, with contributions of N. Shatz and J. Bortz, Nonimaging Optics (Elsevier, Academic Press, 2004).

2008 (1)

2007 (2)

2005 (3)

N. Guselnikov, P. Lazarev, M. Paukshto, and P. Yeh, “Translucent LCDs,” J. Soc. Inf. Disp. 13(4), 339–348 (2005).
[CrossRef]

J. C. Miñano, P. Benítez, J. Chaves, M. Hernández, O. Dross, and A. Santamaría, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202, 594202-12 (2005).
[CrossRef]

D. Feng, Y. Yan, X. Yang, G. Jin, and S. Fan, “Novel integrated light-guide plate for liquid crystal display backlight,” J. Opt. A, Pure Appl. Opt. 7(3), 111–117 (2005).
[CrossRef]

2004 (1)

D. Feng, G. Jin, Y. Yan, and S. Fan, “High quality light guide plates that can control the illumination angle based on microprism structures,” Appl. Phys. Lett. 85(24), 6016–6018 (2004).
[CrossRef]

1998 (1)

H. Tanase, J. Mamiya, and M. Suzuki, “A new backlighting system using a polarizing light pipe,” IBM J. Res. Develop. 42(3), 527–536 (1998).
[CrossRef]

Benítez, P.

J. C. Miñano, P. Benítez, J. Chaves, M. Hernández, O. Dross, and A. Santamaría, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202, 594202-12 (2005).
[CrossRef]

Cassarly, W. J.

W. J. Cassarly, “Backlight pattern optimization,” Proc. SPIE 6834, 683407, 683407-12 (2007).
[CrossRef]

Chaves, J.

J. C. Miñano, P. Benítez, J. Chaves, M. Hernández, O. Dross, and A. Santamaría, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202, 594202-12 (2005).
[CrossRef]

Choi, H. Y.

Dross, O.

J. C. Miñano, P. Benítez, J. Chaves, M. Hernández, O. Dross, and A. Santamaría, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202, 594202-12 (2005).
[CrossRef]

Fan, S.

D. Feng, Y. Yan, X. Yang, G. Jin, and S. Fan, “Novel integrated light-guide plate for liquid crystal display backlight,” J. Opt. A, Pure Appl. Opt. 7(3), 111–117 (2005).
[CrossRef]

D. Feng, G. Jin, Y. Yan, and S. Fan, “High quality light guide plates that can control the illumination angle based on microprism structures,” Appl. Phys. Lett. 85(24), 6016–6018 (2004).
[CrossRef]

Feng, D.

D. Feng, Y. Yan, X. Yang, G. Jin, and S. Fan, “Novel integrated light-guide plate for liquid crystal display backlight,” J. Opt. A, Pure Appl. Opt. 7(3), 111–117 (2005).
[CrossRef]

D. Feng, G. Jin, Y. Yan, and S. Fan, “High quality light guide plates that can control the illumination angle based on microprism structures,” Appl. Phys. Lett. 85(24), 6016–6018 (2004).
[CrossRef]

Fujieda, I.

Guselnikov, N.

N. Guselnikov, P. Lazarev, M. Paukshto, and P. Yeh, “Translucent LCDs,” J. Soc. Inf. Disp. 13(4), 339–348 (2005).
[CrossRef]

Hernández, M.

J. C. Miñano, P. Benítez, J. Chaves, M. Hernández, O. Dross, and A. Santamaría, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202, 594202-12 (2005).
[CrossRef]

Imai, K.

Jin, G.

D. Feng, Y. Yan, X. Yang, G. Jin, and S. Fan, “Novel integrated light-guide plate for liquid crystal display backlight,” J. Opt. A, Pure Appl. Opt. 7(3), 111–117 (2005).
[CrossRef]

D. Feng, G. Jin, Y. Yan, and S. Fan, “High quality light guide plates that can control the illumination angle based on microprism structures,” Appl. Phys. Lett. 85(24), 6016–6018 (2004).
[CrossRef]

Kwon, O. J.

Lazarev, P.

N. Guselnikov, P. Lazarev, M. Paukshto, and P. Yeh, “Translucent LCDs,” J. Soc. Inf. Disp. 13(4), 339–348 (2005).
[CrossRef]

Lee, H. S.

Mamiya, J.

H. Tanase, J. Mamiya, and M. Suzuki, “A new backlighting system using a polarizing light pipe,” IBM J. Res. Develop. 42(3), 527–536 (1998).
[CrossRef]

Miñano, J. C.

J. C. Miñano, P. Benítez, J. Chaves, M. Hernández, O. Dross, and A. Santamaría, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202, 594202-12 (2005).
[CrossRef]

Park, S. R.

Paukshto, M.

N. Guselnikov, P. Lazarev, M. Paukshto, and P. Yeh, “Translucent LCDs,” J. Soc. Inf. Disp. 13(4), 339–348 (2005).
[CrossRef]

Santamaría, A.

J. C. Miñano, P. Benítez, J. Chaves, M. Hernández, O. Dross, and A. Santamaría, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202, 594202-12 (2005).
[CrossRef]

Shin, D.

Song, S. H.

Suzuki, M.

H. Tanase, J. Mamiya, and M. Suzuki, “A new backlighting system using a polarizing light pipe,” IBM J. Res. Develop. 42(3), 527–536 (1998).
[CrossRef]

Tanase, H.

H. Tanase, J. Mamiya, and M. Suzuki, “A new backlighting system using a polarizing light pipe,” IBM J. Res. Develop. 42(3), 527–536 (1998).
[CrossRef]

Yan, Y.

D. Feng, Y. Yan, X. Yang, G. Jin, and S. Fan, “Novel integrated light-guide plate for liquid crystal display backlight,” J. Opt. A, Pure Appl. Opt. 7(3), 111–117 (2005).
[CrossRef]

D. Feng, G. Jin, Y. Yan, and S. Fan, “High quality light guide plates that can control the illumination angle based on microprism structures,” Appl. Phys. Lett. 85(24), 6016–6018 (2004).
[CrossRef]

Yang, X.

D. Feng, Y. Yan, X. Yang, G. Jin, and S. Fan, “Novel integrated light-guide plate for liquid crystal display backlight,” J. Opt. A, Pure Appl. Opt. 7(3), 111–117 (2005).
[CrossRef]

Yeh, P.

N. Guselnikov, P. Lazarev, M. Paukshto, and P. Yeh, “Translucent LCDs,” J. Soc. Inf. Disp. 13(4), 339–348 (2005).
[CrossRef]

Appl. Phys. Lett. (1)

D. Feng, G. Jin, Y. Yan, and S. Fan, “High quality light guide plates that can control the illumination angle based on microprism structures,” Appl. Phys. Lett. 85(24), 6016–6018 (2004).
[CrossRef]

IBM J. Res. Develop. (1)

H. Tanase, J. Mamiya, and M. Suzuki, “A new backlighting system using a polarizing light pipe,” IBM J. Res. Develop. 42(3), 527–536 (1998).
[CrossRef]

J. Opt. A, Pure Appl. Opt. (1)

D. Feng, Y. Yan, X. Yang, G. Jin, and S. Fan, “Novel integrated light-guide plate for liquid crystal display backlight,” J. Opt. A, Pure Appl. Opt. 7(3), 111–117 (2005).
[CrossRef]

J. Soc. Inf. Disp. (1)

N. Guselnikov, P. Lazarev, M. Paukshto, and P. Yeh, “Translucent LCDs,” J. Soc. Inf. Disp. 13(4), 339–348 (2005).
[CrossRef]

Opt. Express (2)

Proc. SPIE (2)

W. J. Cassarly, “Backlight pattern optimization,” Proc. SPIE 6834, 683407, 683407-12 (2007).
[CrossRef]

J. C. Miñano, P. Benítez, J. Chaves, M. Hernández, O. Dross, and A. Santamaría, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202, 594202-12 (2005).
[CrossRef]

Other (1)

R. Winston, J. C. Miñano, and P. Benítez, with contributions of N. Shatz and J. Bortz, Nonimaging Optics (Elsevier, Academic Press, 2004).

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Figures (8)

Fig. 1
Fig. 1

Cross section of a generalized LED backlight design based on the flow-line method.

Fig. 2
Fig. 2

Edge rays of the bundle immersed in a medium of refractive index n and radiating from the strip AB within the angle ± θ.

Fig. 3
Fig. 3

Flow lines for the beam radiating from the strip AB (in red), (a) Definition of the flow lines, (b) Design procedure for the conical and linear backlights.

Fig. 4
Fig. 4

Cross section of designed models, (a) conical backlight, (b) linear backlight.

Fig. 5
Fig. 5

3D view of the LED backlight optics.

Fig. 6
Fig. 6

(a) Manufactured linear backlight. (b) 3D model of the manufactured prototype assembly.

Fig. 7
Fig. 7

(a) Simulated irradiance distribution. (b) Intensity distribution of the prototype.

Fig. 8
Fig. 8

LUCA measurement system, and simulated and measured intensity cross section profiles.

Equations (4)

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j(x,y)= O 1 (x,y) O 2 (x,y) 2
ΔE=2( j 2 j 1 )
dj(x,y) dx =constant = E out 2l
j x + j y y' = E out 2l

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