High resolution scanning laser projection display with diode pumped solid state lasers

We demonstrate bright pictures in the pixel format of HDTV and XGA with a current power consumption lower than 2.5 kW and a RGB laser output power of 15 W with the wavelengths 446 nm, 532 nn and 629 nm. The laser projection system consists of a scanning unit with a rotating polygon scanner (rotational frequency up to 2 kHz) to write the lines and a galvanometer scanner for the vertical deflection of the lines. The system allows the separation of the RGB-raser with the video modulation part from the free moving scanning unit with an optical fiber. The optical fiber provides the video modulated RGB-laser power in a collinear beam to the scanner. We explain detailed the requirements for RGB - laser beams. The main demands for high resolution and sharp scanned pictures are near diffraction limited laser beams, but at least with an optical beam product of < 0.75 mm mrad. Furthermore we give an outlook for an increase of pixel resolution.