Abstract: A light valve projection system is disclosed in which information is impressed on a light modulating fluid overlying a disk wherein incident light is modulated by the information and projected onto a viewing surface. The fluid layer includes a raster area within which the information is written by the deposition of electric charge along scanning lines so as to form orthogonally related diffraction gratings which are parallel to a pair of coordinate axes in the plane of the disk. The diffraction gratings are composed of one set of gratings parallel to the scanning lines which contain green color information, and two sets of diffraction gratings orthogonal to the scanning lines containing red and blue color information. Improved green channel vertical resolution is obtained by axis dwell modulation of the scanning lines to better confine the detail modulation to the raster line axis.