Dan Herrmann CAE Manager, Synopsys Introduction Over the last two decades, there has been extensive research to improve the design of light-emitting diodes (LEDs) to enhance light extraction efficiency, improve beam shaping, and allow color tuning. Techniques such as patterned substrates, polarization-sensitive gratings, back reflectors, surface textures, and phosphor down-conversion have all b...

We present a simple freeform lens design method for an application to LED collimating illumination. The method is derived from a basic geometric-optics analysis and construction approach. By using this method, a highly collimating lens with LED chip size of 1.0 mm × 1.0 mm and optical simulation efficiency of 86.5% under a view angle of ± 5 deg is constructed. To verify the practical performanc...

High power LED converter combined with switching power supply and current adjustment device for is presented. The switching power supply provides one stabilized voltage source, and the current adjustment device controls the output currents with a desired constant current and the over-load protection. The experiment results shows the circuit can work well and pass the load test and the electroma...

An array of spatially distributed light-emitting diodes (LEDs) can produce an illumination pattern that approaches an image by individually modulating each LED. In this letter, I analyze the first-order design of such systems in order to achieve the best match between the illumination distribution and a desired image. In particular, simple formulas are given for the optimal number of LEDs, work...

Abstract The construction industry is responsible for a significant portion of the solid waste that industrialised nations dispose each year. One reason this low rates reuse and recycling, largely due to difficulties in deconstructing buildings an inability easily separate materials components. If were designed facilitate deconstruction easier separation parts, then future material component re...