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http://dx.doi.org/10.3807/HKH.2008.19.2.122

Dual Backlight Unit Incorporating a Single Light Source Integrated with a Beam Splitting Reflector  

Park, Chan-Kyu (Department of Electronic Engineering, Kwangwoon University)
Lee, Hak-Soon (Department of Electronic Engineering, Kwangwoon University)
Lee, Sang-Shin (Department of Electronic Engineering, Kwangwoon University)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.2, 2008 , pp. 122-126 More about this Journal
Abstract
Dual backlight unit incorporating a single light source integrated with a beam splitting reflector was demonstrated, providing a surface light beam for both the keypad and the display section simultaneously. The reflector was realized by aligning a groove substrate with a matching cover, and a light guiding module comprising a stack of light guide panels and prism/diffuser sheets was attached to both sides of the reflector. A light emanating from the light source-placed in the middle of the substrate-undergoes a series of reflections through the reflector to reach the input of the light guiding module. Then it is transformed into a surface light beam, which is used to irradiate the keypad and display sections simultaneously. As for the accomplished dual surface light sources, the measured average luminance and the spatial luminance uniformity were respectively about $420\;cd/m^2$ and 69% for the keypad section, and $640\;cd/m^2$ and 79% for the display section.
Keywords
광분할 반사경;백라이트 유닛;디스플레이;키패드;휴대폰;
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