Video projector

摘要

A projection system and a method of forming a colour image are provided. In this method, a rising time and a falling time required to change image signals for a plurality of colour bars formed on a light valve are secured. First, at least one filter having a slit is installed. Next, incident light is scrolled by converting a rotation of a scrolling unit into a rectilinear motion of a lens cell of the scrolling unit through which the incident light passes. Thereafter, a beam emitted from a light source is separated according to colour using a colour separator which comprises a plurality of dichroic filters which each transmit a beam with one length from the incident beam and reflect beams with other lengths. Then, a plurality of colour beams separated by the colour separator and transmitted by the scrolling unit are made incident on corresponding colour areas of the light valve, whereby a plurality of colour bars are formed. Then, a black bar is formed between adjacent colour bars by controlling a distance between adjacent dichroic filters or controlling a width of the slit.