The liquid crystal is written with a laser beam. The laser beam generated by a laser source is applied through an optical control unit such as galvanometer mirrors to the liquid crystal. The intensity of the laser beam applied to the liquid crystal is controlled by a laser beam intensity varying unit....http://www.google.de/patents/US4810064?utm_source=gb-gplus-sharePatent US4810064 - Liquid crystal projection display having laser intensity varied according to beam change-of-axis speed
