Abstract: An image projection device comprising a light source, a projection lens, an imaging unit, an image displacement element, an optical path compensator and a control unit is provided. When a light beam from a light source passes through the imaging unit, the imaging unit converts the light beam into a plurality of sub-images. Thereafter, the sub-images pass through the image displacement element and the optical path compensator and project the sub-images onto a screen through the projection lens. The image displacement element switches the positions of the sub-images projected on the screen. Furthermore, the control unit synchronizes the sub-images into an integral image. In addition, a moveable projection lens or a moveable imager inside the imaging unit can replace the image displacement element.

Abstract: The present invention relates to a combination structure of a color wheel. The color wheel is composed of a motor and a plurality of color filters. The motor has a rotating shaft. The plurality of color filters is disposed on the motor and joined to become a ring shape around the rotating shaft, and is rotated by the motor. The plurality of color filters comprises a first color filter and a second color filter that are next to each other, and the contacting border of the first color filter and the second color filter is a turning line segment so as to make the first color filter and the second color filter tightly wedged.

Abstract: An adjustable color-temperature projecting device includes a light source for providing light beams, and a filtering means. The filtering means includes red, green and blue filtering sections. The blue filtering section has coatings with different transmissivitys. The intensity of blue primary color light is varied due to the different transmissivitys of the blue filtering section, so that the ratio of blue primary color light in the hybrid light is modified to cause change in color temperature with reduced loss of brightness. Then, the filtering means is moved so that the light beam is projected onto a predetermined location to obtain the desired color temperature.

Abstract: An adjustable color-temperature projecting device includes a light source for providing light beams, and a filtering means. The filtering means includes red, green and blue filtering sections. The blue filtering section has coatings with different transmissivitys. The intensity of blue primary color light is varied due to the different transmissivitys of the blue filtering section, so that the ratio of blue primary color light in the hybrid light is modified to cause change in color temperature with reduced loss of brightness. Then, the filtering means is moved so that the light beam is projected onto a predetermined location to obtain the desired color temperature.

Abstract: The present invention is to provide a multi-function projection system in which yellow beam passes through red and green filters by means of coating, and is cut off by a band-cut filter. Then, a driver selectively brings the band-cut filter into or off the light path. Therefore, the projection system will be selected whether it covers the strong yellow beam in red and green beam or not, so that the screen achieves optimum brightness for use in a briefing, or achieves optimum color saturation for use in enjoying movies. Thus, one projection display has multi-function uses for selecting.

Abstract: A projection display system that can diminish ghost images is disclosed. The projection display system includes an illumination system and an image system. The projection display system has a light source for emitting at least one light beam, and a field lens having a first surface and a second surface opposite to the first surface, the first surface having at least one reflection area. The image system utilizes the field lens and a light valve mounted adjacent to the second surface of the field lens for reflecting the light beam emitted by the light source. The light beam reflected from the light valve to the interface reflecting area is further reflected to a region outside of the light valve by the reflection area.

Abstract: A projection display system that can diminish ghost images is disclosed. The projection display system includes an illumination system and an image system. The projection display system has a light source for emitting at least one light beam, and a field lens having a first surface and a second surface opposite to the first surface, the first surface having at least one reflection area. The image system utilizes the field lens and a light valve mounted adjacent to the second surface of the field lens for reflecting the light beam emitted by the light source. The light beam reflected from the light valve to the interface reflecting area is further reflected to a region outside of the light valve by the reflection area.

Abstract: The present invention mainly includes an illumination system and an imaging system, wherein the illumination system generates an incident light beam, and, by means of reflection with a reflecting lens, projects it from above in front of the field lens, into the first surface of the field lens fronting the projection lens set, then through the field lens, and onto the light valve of the imaging system, wherein the geometric center of the light valve is located at the underside of the optical axis of the second surface adjacent to the corresponding side of the first surface of the field lens, allowing the geometric center of the transmissive area created by the projection of the light beam into the field lens to be much closer to the optical axis of the field lens than the geometric center of the light valve is, thus ensuring that the transmissive area is contained within the optimized area on the field lens, while reducing the amount of distortion generated in the light spot by the light beam coming in through

Abstract: A method for use in a projection display to prevent ghost images on or near a projected image, wherein the projection display comprises an illumination system and an imaging system, the illumination system including a light source; an illumination module; a field lens; and a reflection device, the imaging system includes the field lens; an imaging module including a stop; and a screen, and the method comprises the step of applying a multi-layer anti-reflection coating on the first surface S1 of the field lens facing the light beam coming from the light source and the step of applying a dielectric coating on the surface S2 of the imaging module facing the light beam coming from the field lens.

Abstract: A method for use in a projection display to prevent ghost images on or near a projected image, wherein the projection display comprises an illumination system and an imaging system, the illumination system including a light source; an illumination module; a field lens; and a reflection device. The imaging system includes the field lens; an imaging module including a stop; and a screen. The method comprises changing the surface profile of the surface zone, which would otherwise involves generation of a ghost image, of the surface S1 of the field lens so that the ghost image is reflected to the area outside of the stop or is scattered and the effect of reducing or preventing ghost images can thereby be achieved.