标题: | 发光二极体于功能性频谱照明之研究 An investigation into functional spectral illumination with LED white composite spectra |
作者: | 简铭进 Chien, Ming-Chin 田仲豪 Tien, Chung-Hao 光电工程学系 |
关键字: | 发光二极体;功能性频谱照明;复合频谱;多频谱最佳化;Light emitting diode;Functional spectral illumination;Composite spectra;Multispectral mixing Optimization |
公开日期: | 2012 |
摘要: | 随着近年发光二极体(Light emitting diode, LED)的快速发展,多种LED频谱组合的LED系统已充分具有应用潜能,可根据不同操作目的策略性的调制其复合频谱能量分布。以一般照明为例,对于一目标色温,LED系统可藉由频谱调制提升整体效率与演色性,并拓展适用的环境温度范围。延伸到智能照明,则可根据使用者对照明色温变化的需求调整到对应的频谱,同时维持系统高效能运作。在医疗照明上的应用,需要更着重于频谱在温度与电流变化下的可预测性。 然而,一般而言高功率单色光或萤光转换的LED,其SPD的变化相对于接面温度与驱动电流为非线性的关系,因而增加了系统频谱优化的困难度,导致上述的应用目标难以达成。本论文基于目前市面上商用的LED元件,以现有的制程与材料为基础,针对各终端应用发展一种LED频谱调制最佳化的解决方案,建立精确频谱模型与完整的优化设计流程。 本论文提出将一般非完全对称的LED频谱分解成双高斯函数,准确的预测LED频谱在不同温度与电流下的行为,并将此模型推展到萤光粉转换白光LED (phosphor-converted white LED)。 本论文并尝试以不同角度切入,成功引入透镜几何光学系统设计的概念,针对复合LED照明系统SPD提出相对应的完整设计流程: (1) 初始系统, (2) 边界条件, (3) 优化, (4) 价值函数分析, (5) 判断, 与 (6) 容忍度分析。最终以此技术分别应用于低功率与高功率LED照明系统,实现色温可调、适用环境温度广泛、演色性佳的高效率照明设计。 With the rapid progress in light-emitting diode techniques, all kinds of lighting purposes can be achieved by strategically manipulating the spectral power distributions of LEDs clusters. For example, in general lighting there is a fundamental tradeoff between the efficiency and color rendering quality, where an optimal boundary (the Pareto Front) will be produced. By optimizing the composite spectrum, the LEDs lighting system can be operated alongside the boundary. When the spectral-controllable technique is utilized to fields of intelligent illumination, the color temperature can be adjusted in accordance with end demands. As to the medical lighting, the spectral distortion will be predictable with respect to variant ambient temperature and drive current. In this dissertation, a novel methodology for spectral manipulation has been proposed, including a well-defined spectral model and six optimization steps. The spectral model employing the double-Gaussian function can closely estimate the practical spectrum that is imperfectly symmetric and depends on the junction temperature. For the optimization, the concept in imaging system design has successfully been adopted to develop a composite spectral process. The proposed algorithm would be applied to the low power and high power cluster, respectively, to achieve the color-turntable systems with high efficiency, high color rendering property as well as wide operation window at ambient temperature. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT079624819 http://hdl.handle.net/11536/42582 |
显示于类别: | Thesis |
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