Design of Panel Pattern Array in LED Flat Light for Improvement of Illuminance

A pattern array integrated on the front panel of a LED flat light was designed to improve the illuminance. Various pattern shapes were fabricated, including square pillar, hexagonal pillar, circular pillar, and hemispheres. Among them, the hemispherical pattern shape showed the highest improvement in the illuminance of the LED flat light due to a decrease in the total internal reflection of light. Using both a ray-tracing simulation and an experiment with a hardware fabrication, the optimal conditions in the pattern size of the hemispherical pattern array for the maximum improvement of the illuminance were investigated.