Summary: | 碩士 === 南台科技大學 === 光電工程系 === 100 === Due to the continuous evolution of light emitting diodes (LEDs) technologies, their performance in both luminance and color saturation has been pushed further to the edge. However, in the application of edge-type LED backlight units (BLUs), how to manipulate/permutate multi-binned white light LEDs instead of implementing a single-binned one in a LED light-bar to reduce the cost of LEDs while maintaining almost the same level of color uniformity has been one of the most crucial issues for the BLU industry. Therefore, how to efficiently and effectively determine the optimal permutation for color mixing of binned white light LEDs in a LED light-bar has been the goal of this study.
This study was divided into two major parts: color-mixing experiments of binned white light LEDs in a LED light-bar and the development of a rapid design algorithm for the implementation of optimal permutation for binned white light LEDs in a LED light-bar. The first part was further divided into two phases(1) color mixing experiments for the construction/classification of fundamental groups and (2) color mixing experiments using multi fundamental groups. Full-factorial experiments were performed in the former phase. And color-difference classification databases for fundamental groups, which were demaned for color mixing by using multi fundamental groups in the latter phase, were created using color difference △E as the quality index. In the latter phase, decision rules of selection and rejection for optimal combinations and permutations were developed through planned color mixing experiments of multi-binned white light LEDs in a LED light-bar. Based on the concept of average-color-center, adequately combined with color-difference classification databases for fundamental groups, a proposed observation method can be utilized to pick-up a few optimum fundamental groups and perform trial color-mixing permutations by examining the (relative) color coordinates of binned white light LEDs in the CIE colorimetry diagram. It is quite possible that more than one satisfactory permutation of multi-binned white light LEDs in a LED light-bar could be attained in a short lead time.
This study showed that the implementation algorithm for color mixing experiments using multi fundamental groups, based on color-difference classification databases for fundamental groups combined with decision rules of selection and rejection for optimal combinations and permutations, was absolutely feasible in terms of sorting viable permutation for color mixing of binned white light LEDs. On the contrary, the implementation of rapid design algorithm can be more efficient in sorting workable permutations of color mixing of binned white light LEDs. Thus it can reduce the development lead time and increase the market competiveness.
Key words:LED, Backlight Units (BLUs), color mixing, Arrangement, LED Light Bar, Color Difference
|