Abstract

In this paper, we propose a novel feasible method ‘digital laser-blastering’ (DLB) to fabricate a large-sized LED light guide plate (LGP) of high luminance and efficiency for TV application, which can be hardly achieved by other technologies. Both principle model and experimental measurement are demonstrated, and the comparisons between the experiment group and control group adopting other fabrication technology are also presented. We adopted ${{CO}}_{2}$ laser to engrave the surface of a bare PMMA plate with numbers of micro-concavities. Subsequently, we used Conoscope and BM7 to measure angular luminance and spatial luminance of the backlight unit with the DLB LGP, respectively. In the experimental results, the average spatial luminance of the experiment group with DLB LGPs increases 103–122% at most as compared to the control group, and the feasibility to be applied for the LCD TV of the size over 37 inches is demonstrated. In addition, the DLB LGP adopting an inverted-prism film (IPF) has a very narrow angular distribution in the vertical direction but a much wider in the horizontal, which is suitable especially for TV application.

© 2013 IEEE

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2013 (2)

2012 (2)

S. Park, Y. Shin, E. Choi, H. Ma, S. Lee, "Improvement of luminance and uniformity of light guide panel using scatterer pattern by laser processing," Opt. Laser Technol. 44, 1301-1306 (2012).

D. Grabovičkić, P. Benítez, J. C. Miñano, J. Chaves, "LED backlight designs with the flow-line method," Opt. Express 20, A62-A68 (2012).

2011 (2)

K. Käläntär, "A directional backlight with narrow angular luminance distribution," J. SID 11, 890-893 (2011).

J. W. Pan, C. W. Fan, "2011 High luminance hybrid light guide plate for backlight module application," Opt. Express 19, 20079-20087 (2011).

2009 (3)

Y. K. Ee, P. Kumnorkaew, R. Arif, H. Tong, J. Gilchrist, N. Tansu, "Light extraction efficiency enhancement of InGaN quantum wells light-emitting diodes with polydimethylsiloxane concave microstructures," Opt. Express 17, 13747-13757 (2009).

C. H. Tien, C. H. Hung, T. H. Yu, "Microlens arrays by direct-writing inkjet print for LCD BLU applications," J. Display Technol. 5, 147-151 (2009).

Y. K. Ee, J. M. Biser, W. Cao, H. M. Chan, R. P. Vinci, N. Tansu, "Metalorganic vapor phase epitaxy of III-Nitride light-emitting diodes on nano-patterned AGOG sapphire substrate by abbreviated growth mode," IEEE J. Sel. Topics Quantum Electron. 15, 1066-1072 (2009).

2008 (3)

K. Imai, I. Fujieda, "Illumination uniformity of an edge-lit backlight with emission angle control," Opt. Express 16, 11969-11974 (2008).

C. H. Wu, C. H. Lu, "Fabrication of an LCD light guide plate using closed-die hot embossing," J. Micromech. Microeng. 18, 035006 (2008).

H. S. Jang, M. W. Cho, D. S. Park, "Micro dot patterning on the light guide panel using powder blasting," Sensors 8, 877-885 (2008).

2007 (2)

J. S. Kim, Y. B. Ko, C. J. Hwang, J. D. Kim, K. H. Yoon, "Fabrication of micro injection mold with modified LIGA micro-lens pattern and its application to LCD-BLU," Korea–Australia Rheol. J. 19, 165-169 (2007).

J. H. Lee, H. S. Lee, B. K. Lee, W. S. Choi, H. Y. Choi, J. B. Yoon, "Simple liquid crystal display backlight unit comprising only a single-sheet micropatterned polydimethylsiloxane (PDMS) light-guide plate," Opt. Lett. 32, 2665-2667 (2007).

2006 (1)

S. Aoyama, A. Funamoto, K. Imanaka, "Hybrid normal-reverse prism coupler for light-emitting diode backlight systems," Appl. Opt. 45, 7273-7278 (2006).

2005 (2)

G.-D. Kim, H. J. Kang, S.-H. Ahan, C. K. Song, C. I. Back, C. S. Lee, "Laser marking process for liquid crystal display LGP," Proc. IMech. Eng. Part B: J. Eng. Manuf. 219, 565-569 (2005).

Y. J. Shin, Y. S. Kim, S. H. Park, J. W. Lee, W. G. Jung, Z. P. Chen, "Analysis of laser engraving image inside crystal and PMMA," Proc. SPIE 5713, 539-544 (2005).

2004 (1)

D. Feng, G. F. Jin, Y. B. Yan, S. S. Fan, "High quality light guide plates that can control the illumination angle based on microprism structures," Appl. Phys. Lett. 85, 6016-6019 (2004).

2003 (2)

K. Käläntär, "Modified functional light-guide plate for backlighting transmissive LCDs," J. SID 11, 641-645 (2003).

T. Okumura, A. Tagaya, Y. Koike, "Highly-efficient backlight for liquid crystal display having no optical films," Appl. Phys. Lett. 83, 2515-2517 (2003).

2002 (1)

J. Uh, J. S. Lee, Y. H. Kim, J. T. Choi, M. G. Joo, C. S. Lim, "Laser engraving of micro-patterns on roll surfaces," ISIJ Int. 42, 1266-1272 (2002).

2001 (1)

J. Lawrence, L. Li, "Modification of the wettability characteristics of PMMA by means of ${{CO}}_{2}$ , Nd:YAG, excimer and high power diode laser radiation," Mater. Sci. Eng. A 303, 142-149 (2001).

Appl. Opt. (1)

S. Aoyama, A. Funamoto, K. Imanaka, "Hybrid normal-reverse prism coupler for light-emitting diode backlight systems," Appl. Opt. 45, 7273-7278 (2006).

Appl. Phys. Lett. (1)

T. Okumura, A. Tagaya, Y. Koike, "Highly-efficient backlight for liquid crystal display having no optical films," Appl. Phys. Lett. 83, 2515-2517 (2003).

Appl. Phys. Lett. (1)

D. Feng, G. F. Jin, Y. B. Yan, S. S. Fan, "High quality light guide plates that can control the illumination angle based on microprism structures," Appl. Phys. Lett. 85, 6016-6019 (2004).

IEEE J. Sel. Topics Quantum Electron. (1)

Y. K. Ee, J. M. Biser, W. Cao, H. M. Chan, R. P. Vinci, N. Tansu, "Metalorganic vapor phase epitaxy of III-Nitride light-emitting diodes on nano-patterned AGOG sapphire substrate by abbreviated growth mode," IEEE J. Sel. Topics Quantum Electron. 15, 1066-1072 (2009).

ISIJ Int. (1)

J. Uh, J. S. Lee, Y. H. Kim, J. T. Choi, M. G. Joo, C. S. Lim, "Laser engraving of micro-patterns on roll surfaces," ISIJ Int. 42, 1266-1272 (2002).

J. SID (1)

K. Käläntär, "Modified functional light-guide plate for backlighting transmissive LCDs," J. SID 11, 641-645 (2003).

J. Display Technol. (2)

C. H. Tien, C. H. Hung, T. H. Yu, "Microlens arrays by direct-writing inkjet print for LCD BLU applications," J. Display Technol. 5, 147-151 (2009).

P. F. Zhu, G. Liu, J. Zhang, N. Tansu, "FDTD analysis on extraction efficiency of GaN light-emitting diodes with microsphere arrays," J. Display Technol. 9, 317-323 (2013).

J. Display Technol. (1)

J. Micromech. Microeng. (1)

C. H. Wu, C. H. Lu, "Fabrication of an LCD light guide plate using closed-die hot embossing," J. Micromech. Microeng. 18, 035006 (2008).

J. SID (1)

K. Käläntär, "A directional backlight with narrow angular luminance distribution," J. SID 11, 890-893 (2011).

Korea–Australia Rheol. J. (1)

J. S. Kim, Y. B. Ko, C. J. Hwang, J. D. Kim, K. H. Yoon, "Fabrication of micro injection mold with modified LIGA micro-lens pattern and its application to LCD-BLU," Korea–Australia Rheol. J. 19, 165-169 (2007).

Mater. Sci. Eng. A (1)

J. Lawrence, L. Li, "Modification of the wettability characteristics of PMMA by means of ${{CO}}_{2}$ , Nd:YAG, excimer and high power diode laser radiation," Mater. Sci. Eng. A 303, 142-149 (2001).

Opt. Express (2)

J. W. Pan, C. W. Fan, "2011 High luminance hybrid light guide plate for backlight module application," Opt. Express 19, 20079-20087 (2011).

K. Imai, I. Fujieda, "Illumination uniformity of an edge-lit backlight with emission angle control," Opt. Express 16, 11969-11974 (2008).

Opt. Express (2)

Opt. Laser Technol. (1)

S. Park, Y. Shin, E. Choi, H. Ma, S. Lee, "Improvement of luminance and uniformity of light guide panel using scatterer pattern by laser processing," Opt. Laser Technol. 44, 1301-1306 (2012).

Opt. Lett. (1)

Proc. IMech. Eng. Part B: J. Eng. Manuf. (1)

G.-D. Kim, H. J. Kang, S.-H. Ahan, C. K. Song, C. I. Back, C. S. Lee, "Laser marking process for liquid crystal display LGP," Proc. IMech. Eng. Part B: J. Eng. Manuf. 219, 565-569 (2005).

Proc. SPIE (1)

Y. J. Shin, Y. S. Kim, S. H. Park, J. W. Lee, W. G. Jung, Z. P. Chen, "Analysis of laser engraving image inside crystal and PMMA," Proc. SPIE 5713, 539-544 (2005).

Sensors (1)

H. S. Jang, M. W. Cho, D. S. Park, "Micro dot patterning on the light guide panel using powder blasting," Sensors 8, 877-885 (2008).

Other (3)

T. Hayakawa, Optical element with light extracting dots and display device using same U.S. Patent 7 108 415 (2006).

K. Käläntär, "Functional light-guide plate for backlight unit," SID'99 Tech. Dig. 34.2 (1999) pp. 764-767.

M. Oe, I. Chiba, Plane light source unit U.S. Patent 5 126 882 (1992).

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