Abstract

Light-emitting diode (LED) large-scale uniform rectangular illumination has a wide range of applications and is usually created by an irradiance superposition scheme. Abandoning the traditional method, we propose an approach to generate this illumination mode and enhance efficiency. With this method, an independent rectangular irradiance distribution is generated by each LED lens unit, and the large-scale illumination is obtained by arraying the irradiance distribution. Two slim direct-lit LED backlightings with a distance-height ratio of 3 were designed. An optical performance with irradiance nonuniformity less than 0.0228 and efficiency greater than 96% were obtained. Compared with the traditional methods, the efficiency is significantly enhanced and the number of the LED units is dramatically reduced by this new method.

© 2012 Optical Society of America

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References

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  1. Z. X. Feng, Y. Luo, and Y. J. Han, “Design of LED freeform optical system for road lighting with high luminance/illuminance ratio,” Opt. Express 18, 22020–22031 (2010).
    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]

2011

D. Cho, W. Oh, and G. W. Moon, “A novel adaptive dimming LED backlight system with current compensated X-Y channel drivers for LCD TVs,” J. Disp. Technol. 7, 29–35 (2011).
[CrossRef]

K. Wang, D. Wu, Z. Qin, F. Chen, X. B. Luo, and S. Liu, “New reversing design method for LED uniform illumination,” Opt. Express 19, A830–A840 (2011).
[CrossRef]

2010

2009

A. J. W. Whang, Y. Y. Chen, and Y. T. Teng, “Designing uniform illumination systems by surface-tailored lens and configurations of LED arrays,” J. Disp. Technol. 5, 94–103 (2009).
[CrossRef]

2008

2006

2005

Avendaño-Alejo, M.

Benitez, P.

Cassarly, W. J.

Chaves, J.

Chen, F.

Chen, Y. Y.

A. J. W. Whang, Y. Y. Chen, and Y. T. Teng, “Designing uniform illumination systems by surface-tailored lens and configurations of LED arrays,” J. Disp. Technol. 5, 94–103 (2009).
[CrossRef]

Cho, D.

D. Cho, W. Oh, and G. W. Moon, “A novel adaptive dimming LED backlight system with current compensated X-Y channel drivers for LCD TVs,” J. Disp. Technol. 7, 29–35 (2011).
[CrossRef]

Cvetkovic, A.

Ding, Y.

Dross, O.

Feng, Z. X.

Fournier, F. R.

Gu, P. F.

Han, Y. J.

Koshel, R. J.

Li, H. T.

Liu, S.

Liu, X.

Liu, Z. Y.

Luo, X. B.

Luo, Y.

Miñano, J. C.

Mohedano, R.

Moon, G. W.

D. Cho, W. Oh, and G. W. Moon, “A novel adaptive dimming LED backlight system with current compensated X-Y channel drivers for LCD TVs,” J. Disp. Technol. 7, 29–35 (2011).
[CrossRef]

Moreno, I.

Oh, W.

D. Cho, W. Oh, and G. W. Moon, “A novel adaptive dimming LED backlight system with current compensated X-Y channel drivers for LCD TVs,” J. Disp. Technol. 7, 29–35 (2011).
[CrossRef]

Qin, Z.

Rolland, J. P.

Teng, Y. T.

A. J. W. Whang, Y. Y. Chen, and Y. T. Teng, “Designing uniform illumination systems by surface-tailored lens and configurations of LED arrays,” J. Disp. Technol. 5, 94–103 (2009).
[CrossRef]

Tzonchev, R. I.

Wang, K.

Whang, A. J. W.

A. J. W. Whang, Y. Y. Chen, and Y. T. Teng, “Designing uniform illumination systems by surface-tailored lens and configurations of LED arrays,” J. Disp. Technol. 5, 94–103 (2009).
[CrossRef]

Wu, D.

Zheng, Z. R.

Appl. Opt.

J. Disp. Technol.

A. J. W. Whang, Y. Y. Chen, and Y. T. Teng, “Designing uniform illumination systems by surface-tailored lens and configurations of LED arrays,” J. Disp. Technol. 5, 94–103 (2009).
[CrossRef]

D. Cho, W. Oh, and G. W. Moon, “A novel adaptive dimming LED backlight system with current compensated X-Y channel drivers for LCD TVs,” J. Disp. Technol. 7, 29–35 (2011).
[CrossRef]

Opt. Express

Z. X. Feng, Y. Luo, and Y. J. Han, “Design of LED freeform optical system for road lighting with high luminance/illuminance ratio,” Opt. Express 18, 22020–22031 (2010).
[CrossRef]

Y. Luo, Z. X. Feng, Y. J. Han, and H. T. Li, “Design of compact and smooth free-form optical system with uniform illuminance for LED source,” Opt. Express 18, 9055–9063 (2010).
[CrossRef]

A. Cvetkovic, O. Dross, J. Chaves, P. Benitez, J. C. Miñano, and R. Mohedano, “Etendue-preserving mixing and projection optics for high-luminance LEDs, applied to automotive headlamps,” Opt. Express 14, 13014–13020 (2006).
[CrossRef]

F. Chen, K. Wang, Z. Qin, D. Wu, X. B. Luo, and S. Liu, “Design method of high-efficient LED headlamp lens,” Opt. Express 18, 20926–20938 (2010).
[CrossRef]

Z. Qin, K. Wang, F. Chen, X. B. Luo, and S. Liu, “Analysis of condition for uniform lighting generated by array of light emitting diodes with large view angle,” Opt. Express 18, 17460–17476 (2010).
[CrossRef]

K. Wang, D. Wu, Z. Qin, F. Chen, X. B. Luo, and S. Liu, “New reversing design method for LED uniform illumination,” Opt. Express 19, A830–A840 (2011).
[CrossRef]

K. Wang, F. Chen, Z. Y. Liu, X. B. Luo, and S. Liu, “Design of compact freeform lens for application specific light-emitting diode packaging,” Opt. Express 18, 413–425(2010).
[CrossRef]

Y. Ding, X. Liu, Z. R. Zheng, and P. F. Gu, “Freeform LED lens for uniform illumination,” Opt. Express 16, 12958–12966 (2008).
[CrossRef]

F. R. Fournier, W. J. Cassarly, and J. P. Rolland, “Fast freeform reflector generation using source-target maps,” Opt. Express 18, 5295–5304 (2010).
[CrossRef]

Opt. Lett.

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Figures (10)

Fig. 1.
Fig. 1.

Both high irradiance uniformity and high efficiency cannot be obtained by the irradiance superposition scheme. (a) The irradiance uniformity is high, but much energy is wasted. (b) The efficiency is high, but the irradiance distribution is nonuniform.

Fig. 2.
Fig. 2.

Schematic illustration of the irradiance array for LED uniform rectangular illumination.

Fig. 3.
Fig. 3.

Geometric relationship between the freeform reflector and rays.

Fig. 4.
Fig. 4.

Simple variable separation mapping strategy.

Fig. 5.
Fig. 5.

Schematic of the determination of the variables.

Fig. 6.
Fig. 6.

Schematic of the determination of the sample area.

Fig. 7.
Fig. 7.

Flow chart of the optimization method presented.

Fig. 8.
Fig. 8.

Model of the LED lens unit.

Fig. 9.
Fig. 9.

Irradiance distribution on the target plane 150mm×150mm in size. (a) Obtained from the irradiance array scheme. (b) Obtained from the RDM. The LIDC is described by a polynomial of θ [9], and coefficients of the polynomial are a0=0.11818, a1=0.3175, a2=0.79679, a3=1.3976, and a4=0.52101.

Fig. 10.
Fig. 10.

Irradiance distribution on the target plane 180mm×180mm in size. (a) Obtained from the irradiance array scheme. (b) Obtained from the RDM.

Equations (4)

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

{ρθ=f1(θ,φ,ρ)ρθ=f2(θ,φ,ρ)
{xt=X,yt=4Yθ/π0θ<π/4xt=X(24θ/π),yt=Yπ/4<θ<π/2,
MF=1Ni=1Nwi(xixti)2+(yiyti)2+(zizti)2,
RSD=1M1j=1M(EjE¯1)2,

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