Light Guide Plate Based on Sub-Micron Gratings


Article Preview

A novel light guide plate (LGP) with sub-micron gratings (SMGs) on its upper surface is proposed to control the illumination angle and its initial structure of LGP is given. The periods of SMGs are 0.651μm, 0.516μm and 0.433μm for the LED light sources transmit out vertically with the incidence angle 45º under the total internal reflection condition. The transmission efficiencies vary between 2% and 43% when the depth of grooves of SMGs changes between 0.05 μm and 0.9 μm by using rigorous coupled-wave theory (RCWT). The results show that the LGP utilizing the characteristics of the SMGs can control the transmission angle and get homogeneous output.



Key Engineering Materials (Volumes 364-366)

Edited by:

Guo Fan JIN, Wing Bun LEE, Chi Fai CHEUNG and Suet TO




Y. Ye and L. S. Chen, "Light Guide Plate Based on Sub-Micron Gratings", Key Engineering Materials, Vols. 364-366, pp. 1061-1065, 2008

Online since:

December 2007





[2] D. Feng, G. F. Jin, Y. B. Yan, et al: High quality light guide plates that can control the illumination angle based on micro prism structures. Applied Physics Letters. Vol. 85 (2004), p.6016.

[3] D. Feng, Y. B. Yan, X. P. Yang: Novel integrated light-guide plates for liquid crystal display backlight. Journal of Optics A: Pure and Applied Optics. Vol. 7 (2005), p.111.


[4] A. Tagaya, M. Nagai, Y. Koike, et al: Thin liquid crystal display backlight system with highly scattering optical transmission polymers. Applied Optics. Vol. 40 (2001), p.6274.


[5] Y. Taira, F. Yamada, M. Suzuki, et al: Making a color LCD without color filters. Information Display. Vol. 4-5 (2003), p.40.

[6] G. Harbers, C. G. A. Hoelen: High performance lcd backlighting using high intensity red, green, blue light emitting diodes. SID Intl Symp Digest Tech Paper. Vol. LP. 2/G (2001), p.702.


[7] S. Ochial. Light guide plates and light guide plate assembly utilizing diffraction gratings, U.S. Patent 5, 703, 667. (1997).

[8] Lin J C, Cheng T. Light guide plate with diffraction gratings and backlight module using the same, U.S. Patent 0, 122, 743. (2005).

[9] M. G. Moharam, E. B. Grann, D. A. Pommet, et al: Formulation for stable and efficiency implementation of the rigorous coupled-wave analysis of binary gratings. J Opt Soc Am. Vol. A12 (1995), p.1068.