content_image/312129.jpg
<img src='content_image/312129.jpg'>

diffractive gratings to achieve a very directional emission, 8 or by reducing the size of OLED pixels such that, when combined with microlens arrays, their output resembles that of a point source. 9 What all of the above concepts have in common is the fact that only one final light distribution is realized, which is defined by the optical interplay between light source and secondary optical elements. To circumvent this limitation, mechanically tuneable elements are necessary and result in a setup 

