ISSN:
1013-9826
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
At present, the large backlight modules, used in illuminating advertising pictures, aredesigned and developed in various specifications, whose common goal is to try to manufacturethinner backlight modules and produce more uniform illumination. The currently well developedbacklighting technology for liquid crystal displays (LCDs) can be transformed and used in such anarea. However, the design of edge-lit backlight with size of over 1 square meter has greatdifficulties in eliminating the phenomenon of non-uniform illumination. In this paper, theapplication of Bezier curve in the simulating the dot pattern on the bottom of light guide ispresented, which directly determines the final light extraction efficiency and illuminatinguniformity. Taking the RMS deviation of illuminance values at several sample positions as themerit function, the shape of Bezier curves can be smoothly changed, so that the dot radius can beoptimized in a fast and efficient way. Such an optimization procedure uses only two variables andhas a fast convergence. As an example, a large light guide, 800mm×1000mm in size, was designedby applying the Bezier method, and the final uniformity of 70% was achieved. The most prominentfeature in such a method is that the thickness of designed light guide can decrease to 5 mm. In sum,the large sized edge-lit backlight can be designed in a short optimization period by simulating thedot radius distribution in a shape of the Bezier curve
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.800.pdf
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