Large-Size Square Hollow Cavity Edge-Type LED LightingApparatus Design

• Main Authors: Li,Jyun-Jie, 李俊傑
• Other Authors: Kang,Chih-chieh
• Format: Others
• Language: zh-TW
• Published: 104
• Online Access: http://ndltd.ncl.edu.tw/handle/hnkg9q

碩士 === 南台科技大學 === 光電工程系 === 102 === Differ from its counterpartLED light panel with light guide plate, a rectangle edge-type LED light panel with hollow cavity exhibits additional merits, such as high light extraction efficiency, raw material conservation, diversified modeling, etc. However, its optimal design is a complex engineering problem. To resolve this issue, we studied the interactions between two main design parameterscontrol factors: both the lengths of corner-to-corner of the flat-top surface and bottom surface and the height of the central pyramid reflection structure of the bottom reflector and the thickness of the hollow-cavity in the design of a large-sized rectangle edge-type LED light panel with hollow cavity. As for other design parameters, such as the positions of the narrow-beam LED light-bars disposed along the side edges of the hollow cavity, theheight and width of LED lamp reflector, and the transmission and haze of the diffusion plate on top of the hollow cavity, the implemented voltage and current, etc. ASAP optical simulations were then introduced to perform the design of experiments (DOE) according to experiment assignments in the orthogonal array. Optimal design parameters of the central pyramid reflection structure of the bottom reflector and the height of the hollow cavity were achieved. Then a high-performance prototype of a large-sized rectangle edge-type LED light panel with hollow cavity was constructed according to the obtained optimal design parameters. The light extraction efficiency is of 95% and the emission surfaceilluminance uniformity is of 80%. Its performance was highly agreed with the simulations with errors less than 5% and 8% in terms of light extraction efficiency and emission surface illuminance uniformity, respectively. We concluded the light extraction efficiency of a rectangle edge-type LED light panel with hollow cavity was better-performed traditional edge-type LED light panel with light-guide plate and it is even competitive with the best direct-type LED light panel products. The future work can focus on the improvement of illuminance uniformity.