Method for color correction of field sequential light valve projectors with line-at-a-time addressing

A method of color correction for a single panel scrolling raster color projection system, the system having a single white light source, a single light valve panel, an element for separating the white light into two or more scrolling color bands, and a field-sequential, line-at-a-time addressing system, the method comprising the steps of:

• (a) setting the height in the scrolling direction of at least one of the color band(s) to be greater than the height of the panel in the scrolling direction, and setting the height of the remaining color bands to be at least substantially the same as the height of panel in the scrolling direction, so that the panel is substantially entirely illuminated by each color band at some instant of time during scrolling;
• and
• (b) changing the power to the light source to increase or decrease the lumen output of the light source during the time period in which the panel is substantially entirely illuminated by a color band, thereby to increase or decrease the contribution of the color of the color band to the total lumen output of the system.