Abstract

We introduce a hybrid backlight module, which consists of a hybrid light guide plate (HLGP) and a brightness enhancement film (BEF). The HLGP comprises functions of a conventional light guide plate, a reflector, and a BEF. The HLGP allows one-dimensional rays to be collimated. We add a BEF above the HLGP, and let the crossed-dimension rays to be collimated. Comparing with the conventional edge-lit backlight module, the optical efficiency improves to 1.3-times and the on-axis luminance improves to 3.7-times by using the hybrid backlight module.

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References

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  1. Samsung Electro-Mechanics Co, Ltd\, “LED backlight apparatus, ” US patent 0146530 A1, Jul. 6 (2006)
  2. Samsung Electro-Mechanics Co, Ltd., “LED backlight device,” US patent 0127261 A1, Jun. 7 (2007).
  3. AU Optronics Corporation, Website http://www.auo.com .
  4. W. Zhang, H. Wang, L. Ji, and C. Liu, “Design and Simulation of the LGP Structure for LED Backlight,” Proc. SPIE7655, 765537 (2010).
  5. J. Gourlay and I. Miller, “High Efficiency Hybrid Backlight for Large-area LCD TV, Digest of Technical Paper,” J. Soc. Inf. Disp. 74, 1097–1099 (2010).
  6. S. H. Baik, S.-K. Hwang, Y.-G. Kim, G.-J. Park, J.-H. Kwon, W.-T. Moon, S.-H. Kim, B.-K. Kim, and S.-H. Kang, “Simulation and Fabrication of the Cone Sheet for LCD Backlight Application,” J. Opt. Soc. Korea, Vol.  13(4), 478–483 (2009).
    [CrossRef]
  7. J. C. Brewer and R. J. Sudol, “Hybrid light-extraction film,” J. Soc. Inf. Disp. 17, 10.841 (2009).
  8. O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
    [CrossRef]
  9. M. Shinohana and S. Aoyama, “Surface light source device, elements therefor and apparatus using the same, ” US patent 6231200, Oct. 11 (1996).
  10. Metal industries research & development centre. Website http://www.mirdc.org.tw/index.aspx .
  11. J. Warren, Smith, Modern Optical Engineering (Mc Graw Hill, 2008), pp.128–129
  12. Optical Research Associates (ORA), Website http://www.opticalres.com .
  13. J. Marvin, Weber, Handbook of Optical Materials (CRC press, 2003).
  14. L. Van der Byl, LightWave 3D 8 Texturing (Wordware Publishing Inc., 2004).
  15. R. E. Fischer, B. Tadic-Galeb, and P. R. Yoder, Optical System Design (Mc Graw Hill, 2008).
  16. American National Standards Institute (ANSI), IT7.215–1992. Website http://www.ansi.org .
  17. Y. Y. Chang, T. H. Lin, C. L. Fu, C. F. Lan, R. H. Tsai, H. H. Lin, and J. H. Tsai, “Highly-Collimating Backlighting Systems with Multi-stacked and Multi-layered Optical Sheets,” International Display Workshop, Dec. 1, Fukuoka, Japan (2010).
  18. 3M Vikuiti™ Brightness Enhancement Film II data sheet. Website http://multimedia.3m.com/mws/mediaw ebserver?mwsId- = SSSSSu7zK1fslxtU48_Gmx2eev7qe17zHvTSevTSeSSSSSS– .
  19. 3M-Vikuiti™ ESR film, Websitehttp:// multimedia.3m.com/mws/mediawebserver?66666UuZjcFSLXTtMxMyOXM 6EVuQEcuZgVs6EVs6E666666–
  20. KEIWA Inc, Website http://www.keiwa.co.jp/e/product/pdf_Folder/Opalus_E_200904.pdf
  21. TSUJIDEN CO, LTD. Website http://www.tsujiden.co.jp/eng/product/product_info_diffusion.html .
  22. Chimei Innolux Corporation, Website http://www.deaking.cn/uploadfile/N101L6-L0B.pdf .

2010 (2)

W. Zhang, H. Wang, L. Ji, and C. Liu, “Design and Simulation of the LGP Structure for LED Backlight,” Proc. SPIE7655, 765537 (2010).

J. Gourlay and I. Miller, “High Efficiency Hybrid Backlight for Large-area LCD TV, Digest of Technical Paper,” J. Soc. Inf. Disp. 74, 1097–1099 (2010).

2009 (2)

2006 (1)

O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
[CrossRef]

Alvarez, R.

O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
[CrossRef]

Baik, S. H.

Benitez, P.

O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
[CrossRef]

Brewer, J. C.

J. C. Brewer and R. J. Sudol, “Hybrid light-extraction film,” J. Soc. Inf. Disp. 17, 10.841 (2009).

Chaves, J.

O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
[CrossRef]

Dross, O.

O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
[CrossRef]

Falicoff, W.

O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
[CrossRef]

Gourlay, J.

J. Gourlay and I. Miller, “High Efficiency Hybrid Backlight for Large-area LCD TV, Digest of Technical Paper,” J. Soc. Inf. Disp. 74, 1097–1099 (2010).

Hwang, S.-K.

Ji, L.

W. Zhang, H. Wang, L. Ji, and C. Liu, “Design and Simulation of the LGP Structure for LED Backlight,” Proc. SPIE7655, 765537 (2010).

Kang, S.-H.

Kim, B.-K.

Kim, S.-H.

Kim, Y.-G.

Kwon, J.-H.

Liu, C.

W. Zhang, H. Wang, L. Ji, and C. Liu, “Design and Simulation of the LGP Structure for LED Backlight,” Proc. SPIE7655, 765537 (2010).

Miller, I.

J. Gourlay and I. Miller, “High Efficiency Hybrid Backlight for Large-area LCD TV, Digest of Technical Paper,” J. Soc. Inf. Disp. 74, 1097–1099 (2010).

Miñano, J. C.

O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
[CrossRef]

Moon, W.-T.

Park, G.-J.

Parkyn, W. A.

O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
[CrossRef]

Sudol, R. J.

J. C. Brewer and R. J. Sudol, “Hybrid light-extraction film,” J. Soc. Inf. Disp. 17, 10.841 (2009).

Wang, H.

W. Zhang, H. Wang, L. Ji, and C. Liu, “Design and Simulation of the LGP Structure for LED Backlight,” Proc. SPIE7655, 765537 (2010).

Zhang, W.

W. Zhang, H. Wang, L. Ji, and C. Liu, “Design and Simulation of the LGP Structure for LED Backlight,” Proc. SPIE7655, 765537 (2010).

J. Opt. Soc. Korea (1)

J. Soc. Inf. Disp. (2)

J. C. Brewer and R. J. Sudol, “Hybrid light-extraction film,” J. Soc. Inf. Disp. 17, 10.841 (2009).

J. Gourlay and I. Miller, “High Efficiency Hybrid Backlight for Large-area LCD TV, Digest of Technical Paper,” J. Soc. Inf. Disp. 74, 1097–1099 (2010).

Proc. SPIE (2)

W. Zhang, H. Wang, L. Ji, and C. Liu, “Design and Simulation of the LGP Structure for LED Backlight,” Proc. SPIE7655, 765537 (2010).

O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006).
[CrossRef]

Other (17)

M. Shinohana and S. Aoyama, “Surface light source device, elements therefor and apparatus using the same, ” US patent 6231200, Oct. 11 (1996).

Metal industries research & development centre. Website http://www.mirdc.org.tw/index.aspx .

J. Warren, Smith, Modern Optical Engineering (Mc Graw Hill, 2008), pp.128–129

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

J. Marvin, Weber, Handbook of Optical Materials (CRC press, 2003).

L. Van der Byl, LightWave 3D 8 Texturing (Wordware Publishing Inc., 2004).

R. E. Fischer, B. Tadic-Galeb, and P. R. Yoder, Optical System Design (Mc Graw Hill, 2008).

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

Y. Y. Chang, T. H. Lin, C. L. Fu, C. F. Lan, R. H. Tsai, H. H. Lin, and J. H. Tsai, “Highly-Collimating Backlighting Systems with Multi-stacked and Multi-layered Optical Sheets,” International Display Workshop, Dec. 1, Fukuoka, Japan (2010).

3M Vikuiti™ Brightness Enhancement Film II data sheet. Website http://multimedia.3m.com/mws/mediaw ebserver?mwsId- = SSSSSu7zK1fslxtU48_Gmx2eev7qe17zHvTSevTSeSSSSSS– .

3M-Vikuiti™ ESR film, Websitehttp:// multimedia.3m.com/mws/mediawebserver?66666UuZjcFSLXTtMxMyOXM 6EVuQEcuZgVs6EVs6E666666–

KEIWA Inc, Website http://www.keiwa.co.jp/e/product/pdf_Folder/Opalus_E_200904.pdf

TSUJIDEN CO, LTD. Website http://www.tsujiden.co.jp/eng/product/product_info_diffusion.html .

Chimei Innolux Corporation, Website http://www.deaking.cn/uploadfile/N101L6-L0B.pdf .

Samsung Electro-Mechanics Co, Ltd\, “LED backlight apparatus, ” US patent 0146530 A1, Jul. 6 (2006)

Samsung Electro-Mechanics Co, Ltd., “LED backlight device,” US patent 0127261 A1, Jun. 7 (2007).

AU Optronics Corporation, Website http://www.auo.com .

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Figures (11)

Fig. 1
Fig. 1

(a) The schematic of the HLGP. (b) The function of the microstructures on the main layer and (c) the function of the microstructures on the reflective layer.

Fig. 2
Fig. 2

Illuminance chart of the HLGP whose microstructures on the main layer are adjusted for the uniformity of the illuminance.

Fig. 3
Fig. 3

The relationships between θt, the half-luminance angle in horizontal direction and the normalized on-axis luminance.

Fig. 4
Fig. 4

3D intensity chart of the HLGP.

Fig. 5
Fig. 5

(a) 3D intensity chart of the conventional backlight module.

Fig. 5
Fig. 5

(b) 3D intensity chart of the hybrid backlight module.

Fig. 6
Fig. 6

Output flux of a hybrid backlight and a conventional backlight.

Fig. 7
Fig. 7

The dependence of the luminance and the off-axis angle for the hybrid backlight and the conventional backlight.

Fig. 8
Fig. 8

The microstructures on the main and reflective layers with draft angle.

Fig. 9
Fig. 9

The dependence of the normalized on-axis luminance and the draft angle θd1, θd2 of the microstructures.

Fig. 10
Fig. 10

The schematic of ray trace reflected by the right side of the HLGP.

Tables (2)

Tables Icon

Table 1 The Conditions of Each Layer in the HLGP Simulation.

Tables Icon

Table 2 The Model Names of the Optical Film.

Equations (9)

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

α = θ i n θ t ,
α = β + θ t ,
β = θ i n 2 θ t .
n 1 × sin ( β ) = n 2 × sin ( γ ) ,
n 2 × sin ( γ ) = n 1 × sin ( ε ) ,
β = ε .
ε = 2 ω ,
ω + θ r = 90 o .
θ r = 90 o ( 1 / 2 ) × sin 1 ( n 2 / n 1 ) .

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