Optimal Temperature Compensation for Multiple Chip LEDs
碩士 === 國立臺灣科技大學 === 電子工程系 === 99 === In recent years, LED is widely used to replace the traditional lighting source due to the demands of energy efficiency and carbon-emission reduction with the advancement of semiconductor material technology. However, the white LED lighting is facing its bottlenec...
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ndltd-TW-099NTUS54280622019-05-15T20:42:06Z http://ndltd.ncl.edu.tw/handle/yhhaqn Optimal Temperature Compensation for Multiple Chip LEDs 多色LED之最佳化溫度補償機制 Ju-chi Liang 梁如齊 碩士 國立臺灣科技大學 電子工程系 99 In recent years, LED is widely used to replace the traditional lighting source due to the demands of energy efficiency and carbon-emission reduction with the advancement of semiconductor material technology. However, the white LED lighting is facing its bottlenecks in terms of low CRI, brightness decay, and color shifting caused from the rising of junction temperature. In this research, to obtain the high color rendering index and the tunable illumination, multiple chip LEDs are used to construct the full spectrum lighting source. Unfortunately, the emitting characteristics of LED are easy to be interfered by variation of junction temperature. The increasing of LED junction temperature results in low efficiency, wavelength shifting, and lifetime degradation. In addition, it also produces color errors in light spectrum reconstruction. This thesis provides a color correcting method for multiple chip LEDs lighting source. The variance of temperature (ΔT) is used to calculate the reconstruction coefficient variance (ΔC) of multiple chip LEDs systems. Moreover, the most efficient temperature compensation is developed by using reconstruction coefficient variance (ΔC) for LED selection optimization. Neng-chung Hu Chin-han Wu 胡能忠 吳錦銓 2011 學位論文 ; thesis 56 zh-TW |
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碩士 === 國立臺灣科技大學 === 電子工程系 === 99 === In recent years, LED is widely used to replace the traditional lighting source due to the demands of energy efficiency and carbon-emission reduction with the advancement of semiconductor material technology. However, the white LED lighting is facing its bottlenecks in terms of low CRI, brightness decay, and color shifting caused from the rising of junction temperature.
In this research, to obtain the high color rendering index and the tunable illumination, multiple chip LEDs are used to construct the full spectrum lighting source. Unfortunately, the emitting characteristics of LED are easy to be interfered by variation of junction temperature. The increasing of LED junction temperature results in low efficiency, wavelength shifting, and lifetime degradation. In addition, it also produces color errors in light spectrum reconstruction.
This thesis provides a color correcting method for multiple chip LEDs lighting source. The variance of temperature (ΔT) is used to calculate the reconstruction coefficient variance (ΔC) of multiple chip LEDs systems. Moreover, the most efficient temperature compensation is developed by using reconstruction coefficient variance (ΔC) for LED selection optimization.
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author2 |
Neng-chung Hu |
author_facet |
Neng-chung Hu Ju-chi Liang 梁如齊 |
author |
Ju-chi Liang 梁如齊 |
spellingShingle |
Ju-chi Liang 梁如齊 Optimal Temperature Compensation for Multiple Chip LEDs |
author_sort |
Ju-chi Liang |
title |
Optimal Temperature Compensation for Multiple Chip LEDs |
title_short |
Optimal Temperature Compensation for Multiple Chip LEDs |
title_full |
Optimal Temperature Compensation for Multiple Chip LEDs |
title_fullStr |
Optimal Temperature Compensation for Multiple Chip LEDs |
title_full_unstemmed |
Optimal Temperature Compensation for Multiple Chip LEDs |
title_sort |
optimal temperature compensation for multiple chip leds |
publishDate |
2011 |
url |
http://ndltd.ncl.edu.tw/handle/yhhaqn |
work_keys_str_mv |
AT juchiliang optimaltemperaturecompensationformultiplechipleds AT liángrúqí optimaltemperaturecompensationformultiplechipleds AT juchiliang duōsèledzhīzuìjiāhuàwēndùbǔchángjīzhì AT liángrúqí duōsèledzhīzuìjiāhuàwēndùbǔchángjīzhì |
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