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Proceedings Paper

Enhancement of the optical performances for the LED backlight systems with a novel lens cap
Author(s): Jee-Gong Chang; Charles Lun-De Liao; Chi-Chuan Hwang
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Paper Abstract

A novel dual-cone-shaped side-emitting lens cap for High Brightness Light Emitting Diodes (HB-LEDs) is proposed for improving brightness and high uniformity of the direct LED acklight Units (BLUs) for large area LCD-TVs. Combining the designed lens cap with red, green and blue (RGB) chips on a Metal Core Printed Circuit Board (MCPCB), the LED module with the proposed cap is able to provide a compact white light source with unique features such as instant color variability and lower power usage, etc. The dual-cone-shaped of the proposed lens cap is designed to emitting most of the light rays to the sides, only a small portion of light upward along the optical axis of the lens, providing a uniform luminance distribution and the high brightness on the backlight. In addition, a small, half-circle eflective surface is designed and upon the proposed LED module about 10mm, the surfaces of which are attached with reflective films to increase the level of light mixing in the larger, global reflector optical box. With the structure of the LED module well designed, the LED backlight Module would design for the large area LCD-TV using the fewer number of LEDs and also have low power consumption. The results indeed identify the attributes of the BLU, which make it possible to achieve excellent backlight performance using a direct illumination approach from the light source of "Dual-Cone-Shaped Side-Emitting Lens Cap of LEDs".

Paper Details

Date Published: 5 September 2006
PDF: 6 pages
Proc. SPIE 6289, Novel Optical Systems Design and Optimization IX, 62890X (5 September 2006); doi: 10.1117/12.678040
Show Author Affiliations
Jee-Gong Chang, National Ctr. for High-Performance Computing (Taiwan)
Charles Lun-De Liao, National Cheng Kung Univ. (Taiwan)
Chi-Chuan Hwang, National Cheng Kung Univ. (Taiwan)


Published in SPIE Proceedings Vol. 6289:
Novel Optical Systems Design and Optimization IX
José M. Sasian; Mary G. Turner, Editor(s)

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