LED Light Coupler Design for a Ultra Thin Light Guide

Lee, J.H.; Chang, W.; Choi, D.

doi:10.3807/hkh.2007.11.3.113

Cited by 3 publications

(6 citation statements)

References 10 publications

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“…이트가 나타내는 광학 성능을 신뢰성 있게 예측하여 부품의 개발 기간을 단축시키는데 매우 유용하게 사용되어 왔다 [12][13][14][15][16][17][18] . [7] 을 거쳐 비교하였고 정 면 휘도 및 반치폭(full-width at half-maximum)을 정량적으 로 구하여 비교하였다.…”

Section: 백라이트에서 빛의 유도(Guiding)를 담당하는 부품은 도광판unclassified

Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications

Seo¹,

2011

Korean Journal of Optics and Photonics

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The optical performance of LLF(Lenticular Lens Film)-based backlight was studied by using optical simulation as functions of the aspect ratio and the refractive index of lenticular lenses. In order to perform reliable simulation, the BSDF(bi-directional scattering distribution function) of the scattering dots on the bottom surface of the light guide plate was obtained as a superposition of the Lambertian and the elliptic Gaussian distribution components by comparing the experimental results and the simulation for the luminance distribution on the light guide. Based on this approach, an appropriate BSDF of the scattering dots of the light guide was constructed. The resultant values of the optimized aspect ratio and the refractive were found to be 1.25 and 1.65, respectively. In spite of the hybrid aspects of LLF incorporating both diffusing and collimating functions, the optical performance, in particular the on-axis luminance of LLF-based backlight was inferior by about 20% compared to that of conventional backlights adopting one prism film. However, the combination of two lenticular lens films resulted in comparable luminance gain as well as smooth decrease in the luminance with the viewing angle without exhibiting any side lobes.

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Section: 백라이트에서 빛의 유도(Guiding)를 담당하는 부품은 도광판unclassified

Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications

Seo¹,

2011

Korean Journal of Optics and Photonics

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“…Various plastic lens shapes, such as hemispherical, cylindrical, and elliptical were used in LED modules for guiding light to escape. 1,2) Other focus lenses, such as lens array and micro lens were also reported. [3][4][5] From economical concerns, it is common to have computer-assisted software, such as optical simulation software, 2) or the optimization software 6,7) in assisting design and fabrication of optical components.…”

Section: Introductionmentioning

confidence: 99%

“…1,2) Other focus lenses, such as lens array and micro lens were also reported. [3][4][5] From economical concerns, it is common to have computer-assisted software, such as optical simulation software, 2) or the optimization software 6,7) in assisting design and fabrication of optical components. Seeking an optimization technique for solving design and fabrication issues is a very interesting research topic.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding to the design perspective, three geometrical parameters were included in lens design in connection with one-factor statistical optimization in optical ray tracing simulation. 2,12) In the perspective of the lens fabrication, a set of process parameters providing a minimal lens shrinkage was obtained by Moldex 3D in conjunction with Taguchi's optimization. Then we were able to fabricate an optimal focus lens with a right injection molding process.…”

Section: Introductionmentioning

confidence: 99%

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An Optimum Design and Fabrication of Focus Lens for High Intensity Light-Emitting Diodes

Tsai¹,

Huang

Wang³

et al. 2009

Jpn. J. Appl. Phys.

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A maximum output intensity of high-power light-emitting diodes (LEDs) with high-efficiency focus lens is demonstrated. A commercial software package of Trace Pro and one-factor method are used to simulate the focus lens. The optimum parameters of focus-lens design are the radius curvature, cavity depth, and lens height are 2.75, 2.45, and 5.7 mm, respectively. For the fabrication of focus lens with injection molding, the optimum parameters are simulated by adapting Taguchi's method of the smaller-the better algorithm in a software package for Moldex 3D. By employing both optimum design and fabrication of the focus lens, a maximum peak intensity for 64.6 cd for a 1 W blue LED module was realized under a constant driving current of 320 mA and the voltage of 3.2 V. In comparison with a commercial focus lens used in high-power LEDs under the same test conditions, the high-power LEDs with proposed focus lens exhibits about 2 -3 times improvement in the output intensity. This study may provide a practical guideline for design and fabrication of a high-efficiency focus lens used in high-intensity high-power LED modules.

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“…Specifically, to analyze the irradiance performances from the LED arrays, the design expressions for illumination uniformity in a near-target Development of an Illumination Measurement Device for Color Distribution … -Do Ky Son et al plane from LED arrays have been derived [8], and the far-field condition for an array of LEDs is analyzed by LED radiation pattern, array geometry, and the number of LEDs [9]. Moreover, to achieve uniform illumination, a design process using a surface-tailored lens has been proposed [10] and an efficient coupler design has been reported [11].…”

Section: Introductionmentioning

confidence: 99%

Development of an Illumination Measurement Device for Color Distribution Based on a CIE 1931 XYZ Sensor

Son¹,

Cho²,

Moon³

et al. 2011

Journal of the Optical Society of Korea

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In this paper, an easy-to-use measurement device for illumination distribution is developed. The device consists of a sensor array module, a control module, and a PC interface. The sensor array module incorporates CIE 1931 color sensors and the ARM-based 96 MHz microcontroller in the control module for measurement and data processing. The sensor array module contains 64 color sensors arranged in a 16 × 4 array. The sensitivity of the sensor array module can be adjusted depending on the illumination level to be measured. The measurement data and control signals are exchanged via USB 2.0 standard. To demonstrate the performance of the device, the illumination distribution is measured for colors of red, green, and blue and is graphically shown. The device can be used for measurement of the illumination distribution, design and adjustment of LED illumination.

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LED Light Coupler Design for a Ultra Thin Light Guide

Cited by 3 publications

References 10 publications

Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications

Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications

An Optimum Design and Fabrication of Focus Lens for High Intensity Light-Emitting Diodes

Development of an Illumination Measurement Device for Color Distribution Based on a CIE 1931 XYZ Sensor

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