MEMS Mirror Based Dynamic Solid State Lighting Module
Society for Information Display 2016 International Symposium, May 24th, 2016, San Francisco, CA MEMS Mirror Based Dynamic Solid State Lighting Module Abhishek Kasturi, Veljko Milanovic, James Yang Mirrorcle Technologies, Inc., Richmond CA Abstract Figure 1a,b images show a comparison of some sample content A novel dynamic solid state lighting (SSL) module is projected to the transparent film and a phosphor plate, demonstrated, allowing users to program the direction, brightness, respectively. Content is projected with a 40Hz refresh rate and divergence and shape of a projected white light in a variety of emission is mostly white. Significant brightness increase was lighting applications. The module is enabled by a fast beam- achieved by aluminum-mirror backing of the thin films. steering MEMS mirror with high optical power handling. In order a) b) to produce and project bright white light, the module illuminates a phosphor target with a high power laser of several Watts. A projection lens projects the phosphor target into a cone of light of up to 60°. This light projection is arbitrarily shaped and dynamically programmable by controlling a MEMS mirror scan head to address specific portions of the phosphor target. An adjustable focus lens in the scan head further allows control of Transparent emissive film Phosphor sample projected beam divergence. Successful prototypes were demonstrated with both a single 445nm laser diode source (2.5W Figure 1. Examples of monochrome vector content laser power) and with a dual (combined) laser diode sources displayed on emissive films, excited by a 405nm laser. (5.5W laser power). While the prototypes have to date been limited a) b) by available power of the laser sources, it is estimated that the novel MEMS mirror scan head design allows >10W (CW) operation on a 2mm mirror without multilayer dielectric coatings.
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