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https://doi.org/10.3938/NPSM.69.855
A Study on the Optical Design and Improvement of Optical Characteristics of LED flat Lighting System According to the Light Source and Pattern Shape Arranged at Corners

So Hee PARK*

Department of Physics, College of Natural Science, Chosun University, Gwangju 61452, Korea
Correspondence to: shpark@chosun.ac.kr
Received March 28, 2019; Revised June 20, 2019; Accepted July 9, 2019.
This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The need for the development of a lighting devise with balanced characteristics has recently been identified. For the complete removal of glare, a light emitting diode (LED) lighting device is being developed to control the desired light distribution and to apply a high reflectance so as to have regular reflection characteristics. If the loss of light is to be minimized, the angle of the LED must be adjusted to obtain a Lambertian light distribution, and the scattering pattern processed in the light guide plate (LGP) must be controlled. In this study, new conditions for the position and the angle of the light source were established by deviating from the conventional method in which the LED is located only on one side of the LGP. We have combined LEDs on the edge of the LGP to obtain an improved output with high brightness and of large-area uniformity. We also designed a flat lighting system by applying the scattering pattern to the LGP, and we analyzed the conditions required to improve the optical characteristics by using computer simulations. As a result, four LEDs with a view angle of 60 $^{\circ}$ were inserted into the corner of the LGP, and a curved v-groove pattern was applied to improve the optical characteristics.
PACS numbers: 42.15.Eq, 42.15.Dp, 42.30.$-$d, 42.79.Kr, 42.82.Bq
Keywords: Light guide plate (LGP), LED lighting, Reflector, Luminance, Uniformity

February 2020, 70 (2)