Optimized pattern design of light-guide plate (LGP)

• Autorzy: Kim Y. C. , Oh T. S. , Lee Y. M.
• Języki publikacji: EN

Abstrakty

EN

We have investigated the light intensity distributions of a 7-inch LGP to increase output illuminance uniformity by reducing the bright and dark areas caused by a plurality of LED. We analyzed the effects of the LED–LED gap and LED–LGP space to the light intensity distribution in the LGP inside. We have found that the density function of LGP pattern has a simple exponential terms. We analyzed the output light intensity of the LGP through the comparison of the simulation results between adopting the hemisphere pattern density function and adopting the equidistance pattern density function. And also, to reduce the bright spot and dark areas, we have introduced a convex elliptical LED reflector. As a result, the output illuminance uniformity was improved effectively by the adoption of the pattern density function and the new LED reflector.

Słowa kluczowe

EN

TFT-LCD; backlight unit (BLU); light-guide plate (LGP); pattern density function; hot spot

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2011
• Tom: Vol. 41, nr 4
• Strony: 863--872
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Kim Y. C.

autor

Oh T. S.

autor

Lee Y. M.

• Department of Optometry, Eulji University, Seongnam-si, Gyeonggi-do, 461-713, Korea

Bibliografia

• [1] GABSEING LEE, JAE HO JEONG, SANG-JOON YOON, DONG-HOON CHOI, Discrete design approach for light guide panel in back light unit to improve the optical performances of liquid crystal display,Proceedings of 8th World Congress on Structural and Multidisciplinary Optimization, Lisbon, Portugal, June, 2009, pp. 1–6.
• [2] JOONSOO CHOI, KWANG-SOO HAHN, HEEKYUNG SEO, SEONG-CHEOL KIM, Design, analysis, and optimization of LCD backlight unit using ray tracing simulation, Proceedings of ICCSA2004, Perugia, Italy, 2004, pp. 837–846.
• [3] JAE HO JEONG, GABSEONG LEE, SANG-JOON YOON, DONG-HOON CHOI, Design optimization for optical pattern to improve illuminance and uniformity of light guide panel in LCD back light unit, Proceedings of 5th China–Japan–Korea Joint Symposium on Optimization of Structural and Mechanical Systems, Jeju Island, Korea, June, 2008.
• [4] JUNG HO LEE, KIE-BONG NAHM, JAE-HYEON KO, JOONG HYUN KIM, Optimization of optical structure of light guide panel for uniformity improvement of edge-lit backlight, Hankook Kwanghak Hoeji 21, 2010, pp. 61–68.
• [5] YOUNG CHUL KIM, SEONG JOON AHN, SEUNGJOON AHN, TAE-SIK OH, HO-SEOB KIM, DAE-WOOK KIM, Output characteristics of a LGP for TFT-LCD with pyramid shaped pattern, Journal of the Korea Academia-Industrial Cooperation Society 10, 2009, pp. 3080–3086.
• [6] YOUNG CHUL KIM, LGP output characteristics depending in BLU pattern size, Hankook Kwanghak Hoeji 19, 2008, pp. 43–47.