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Proceedings Paper

Nonimaging achromatic lens design for LED direct-lit backlight applications
Author(s): Meng-Che Tsai; Bo-Song Chen; Tsung-Xian Lee
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Paper Abstract

Nowadays, light emitting diodes (LEDs) have been widely used in backlight module for display technology. Most of researches tend to improve optical performance in specific applications, such as sufficient efficiency, desired intensity distribution and high illuminance uniformity. However, most of phosphor converted white LEDs have the problem of inducing impure white light. The undesired phenomenon of yellow ring or blue ring becomes more serious through incorrect secondary optical design. In this paper, we emphasize on enhancing the spatial color and illuminance uniformity of LED direct-lit backlight using nonimaging achromatic lens design. We propose a new design method to re-distribute and uniform the ratio of blue and yellow light on the target surface. Moreover, we further apply it in direct-lit LED backlight lens design, in which the uniformity of illuminance on the out coupling surface can be as much as 83.7% and the color uniformity triangleu'v') is improved to 0.0039. Therefore, the result of high color and illumination uniformity can be achieved simultaneously.

Paper Details

Date Published: 25 September 2014
PDF: 10 pages
Proc. SPIE 9192, Current Developments in Lens Design and Optical Engineering XV, 91920U (25 September 2014); doi: 10.1117/12.2061176
Show Author Affiliations
Meng-Che Tsai, National Taiwan Univ. of Science and Technology (Taiwan)
Bo-Song Chen, National Taiwan Univ. of Science and Technology (Taiwan)
Tsung-Xian Lee, National Taiwan Univ. of Science and Technology (Taiwan)

Published in SPIE Proceedings Vol. 9192:
Current Developments in Lens Design and Optical Engineering XV
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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