Projection type image display system capable of color scrolling

A projection system comprising:

• a light source;
• a color separator which separates an incident beam according to color;
• a scrolling unit, comprising at least one lens cell, which converts a rotation of the lens cell into the rectilinear motion of an area of the lens cell through which light passes so that an incident beam is scrolled;
• a light valve which processes a beam transmitted by the color separator and the scrolling unit according to an image signal and which forms a color picture, the light valve comprising a plurality of micromirrors independently driven according to image signals to change a reflection angle of incident light;
• a projection lens unit which magnifies the color picture formed by the light valve and which projects the magnified color picture onto a screen;
• a total internal reflection prism disposed in front of the light valve, which directs light passed through the color separator and the scrolling unit toward the light valve and which directs light reflected by the light valve toward the projection lens unit, the total internal reflection prism comprising:
• a first prism, having an incidence surface,
• a second prism, attached to the first prism at an interface and having an emission surface, and
• a total reflection surface, formed on the interface between the first and second prisms, for totally reflecting incident light at a predetermined angle;
• and
• a reflection prism disposed in front of the incidence surface of the first prism, which reflects light passed through the color separator and the scrolling unit toward the incidence surface of the first prism;
• wherein the micromirrors are diagonally driven according to the image signals.

A projection system, comprising:

• a light source;
• a color separator which separates an incident beam according to color;
• a scrolling unit, comprising at least one lens cell, which converts a rotation of the lens cell into the rectilinear motion of an area of the lens cell through which light passes so that an incident beam is scrolled;
• a light valve which processes a beam transmitted by the color separator and the scrolling unit according to an image signal and which forms a color picture, the light valve comprising a plurality of micromirrors independently driven according to image signals to change a reflection angle of incident light;
• and
• a projection lens unit which magnifies the color picture formed by the light valve and which projects the magnified color picture onto a screen;
• wherein the micromirrors are perpendicularly driven according to the image signals;
• and
• wherein the scrolling unit comprises:
• first and second spiral lens disks installed apart from each other, each including at least one spirally disposed cylindrical lens cell, and
• a glass rod disposed between the first and second spiral lens disks.