| Summary: | 碩士 === 南台科技大學 === 光電工程系 === 102 === Differ from its counterpartLED 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 parameterscontrol 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.
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