Nonimaging achromatic lens design for LED direct-lit backlight applications

Meng-Che Tsai; Bo-Song Chen; Tsung-Xian Lee

doi:10.1117/12.2061176

25 September 2014 Nonimaging achromatic lens design for LED direct-lit backlight applications

Meng-Che Tsai, Bo-Song Chen, Tsung-Xian Lee

Proceedings Volume 9192, Current Developments in Lens Design and Optical Engineering XV; 91920U (2014) https://doi.org/10.1117/12.2061176
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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.

Citation Download Citation

Meng-Che Tsai, Bo-Song Chen, and Tsung-Xian Lee "Nonimaging achromatic lens design for LED direct-lit backlight applications", Proc. SPIE 9192, Current Developments in Lens Design and Optical Engineering XV, 91920U (25 September 2014); https://doi.org/10.1117/12.2061176

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