LED Light Coupler Design for a Ultra Thin Light Guide

Lee, Jun ho; Chang, Won−Seok; Choi, Doo-Sun

doi:10.3807/josk.2007.11.3.113

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…The utilization of these LED light sources can significantly reduce the thickness of the light guide for extremely thin and lightweight backlight modules. [5][6][7][8][9] However, if a thinner light guide is used, smaller-sized microstructures ͑or dots͒ must be used to create a smoother backlight field, as larger dots tend to produce a more "grainy" field, showing traces of individual microstructures. This increases the number of the dots necessary for use in the base of the light guide.…”

Section: Introductionmentioning

confidence: 99%

Use of molecular dynamics method for dot pattern design of a thin light guide in an LED backlight

et al. 2009

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We propose a molecular dynamics method dot generation scheme incorporating the periodic boundary and fixed-cell boundary geometrical conditions to generate random dot distribution on the order of several million dots for use in the base of a thin light guide. In addition, the generation scheme can be used to easily adjust the dot density at any local region from illuminance causing feedback in the optical design phase. Based on the incorporation of these two geometrical conditions, the generation of the random dots for the whole LED light guide can be simplified to just three subdomains, one domain represented by the periodic boundary condition, and the other two domains represented by the fixed-cell boundary condition. Employing these conditions significantly shortens the computational time necessary to obtain optimal random dot distribution and subsequent optical optimization on a PC using optical commercial software.

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Section: Introductionmentioning

confidence: 99%

Use of molecular dynamics method for dot pattern design of a thin light guide in an LED backlight

et al. 2009

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The study of LED uniform lightguide for liquid crystal display backlight applications

Chien

Chen

2008

SPIE Proceedings

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An integrated LED reflector for backlight system

Chien

Chen

2008

SPIE Proceedings

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An edge-backlight unit (EBLU) is applied as the light device to provide uniform light of liquid crystal display (LCD). Generally, the cathode cold fluorescent lamp (CCFL) is employed as the light source of BLU. With the advantages such as long durability, no mercury substance and good endurance of heavy impact, the light emitting diode (LED) is now accepted well known as available device for solid state lighting. To achieve the market requirement of the thin-film liquid crystal display (LCD) and the green-level product, the LED is replaced with the CCFL used in monitor in order to make display thinner, lighter, no Hg containing. In this paper, the integrated LED reflector is proposed because it enables the point-like light to distribute propagating-light line pattern successfully. To optimize the size and the radian of the reflector, our designed integrated LED reflector can achieve an optical efficiency more than 85%, and its light output length is 11 times of the input light source. Therefore, the integrated LED reflector not only can decrease the number of LED to save the built space, but also enhance the output efficiency. In the future, an integrated LED reflector could make displays thinner and brighter for backlight applications.

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LED Light Coupler Design for a Ultra Thin Light Guide

Cited by 10 publications

References 12 publications

Use of molecular dynamics method for dot pattern design of a thin light guide in an LED backlight

Use of molecular dynamics method for dot pattern design of a thin light guide in an LED backlight

The study of LED uniform lightguide for liquid crystal display backlight applications

An integrated LED reflector for backlight system

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