Abstract: A projector system comprises an illumination-optical system (1), a colorseparating system (4) which separates light coming from the illumination-optical system (1) into at least three beams of colored light (R,G,B), the system further comprising, for each beam of colored light, a modulation device (16, 18, 19) for modulating the beam of colored light, and a color combiner (20) which combines the modulated color beams. The projector system comprises a polarization conversion system (PCS) for at least one colored beam and no polarization conversion system for at least one of the other colored beams.

Abstract: The present invention relates to an illumination system (300) comprising a light guide (302) having an entrance face, an exit face and an aperture in which a light source (301) can be arranged, and a display system comprising such an illumination system (300). The idea of the present invention is that various elements (306, 307) are arranged in the light guide (302) to increase the angle of light beams incident in the light guide (302) with respect to the optical axis (304) of the system (300) and to create a homogeneous illumination at the exit face of the light guide (302). The present invention is advantageous, since the claimed illumination system (300) decreases the length of a given light guide (302), making the illumination system (300) smaller, lighter and more compact with even illumination and a high optical efficiency.

Abstract: A color projection system is disclosed, comprising a light valve device (4) for modulating light incident thereon in accordance with information of the image to be displayed, an AC-operated light source (1) for generating light of at least two different colors, and an illumination unit (3) for illuminating said light valve device with said generated light of different colors in a sequential fashion. The light valve device is controlled in synchronization with said illumination unit (3) in order to produce a colored output image. Furthermore, the sequential color cycle of the light valve device (4) and the AC cycle for the illumination unit are adapted to be out of phase with each other. A method of operating such a projection system is also disclosed.

Abstract: The invention relates to a 3-panel transmissive projection system. In particular, the invention relates to a 3-panel transmissive projection system applying reflective type polarizers for both polarizing and analyzing operations in the projection system.

Abstract: The invention relates to a projection system (10) for projecting an image onto a screen (16). The system (10) comprises a main video projector (14) arranged to project a main image onto the screen (16), and further a contrast correction projector (12) arranged to project a correction image onto the screen (16) to compensate for imperfections in the image projected by the main video projector (14). The correction projector (12) may be a cheap and simple projector using for its light source light emitting diodes or stray light from the main projector. Typically, the correction projector (12) gives a steady image on the screen (16), only compensating for the imperfections in the main image displayed by the main projector.

Abstract: The invention relates to a projection device for projecting an image, comprising an illumination means (1) having an entrance (13) for entering light from a light source, a polarization-selective mirror (3) for transmitting a first polarization component (42) of the light to a display panel (4) and reflecting a second component (43) back to the illumination means (1), and a display panel (4) for selecting colour components of the first polarization component for projection at a projection means (7). The display panel comprises a dichroic filter means (5) for filtering colour components of the first polarization component (42) and a controllable reflective means (6) for changing the state of polarization of the filtered colour components depending on a control signal and for reflecting the filtered colour components back to the polarization-selective mirror (3).

Abstract: A scrolling colour projection system comprising a lamp (4) with a pulsed drive current (20) and a colour scanner (6, 8a, 8b, 8c, 9) for generating a light beam (5b) with a plurality of scrolling colour fields, which is arranged to illuminate a display device (3) to produce a projection of an image generated by the display device. The system further includes a filtering element (31) arranged in the light path between the lamp and the projected image, and the transmission of the filtering element (31) is synchronized with the lamp current so as to cancel an intensity peak in the lamp flux. The filtering element thus effectively removes the impact of the current pulse on the light intensity, resulting in a constant intensity in the projected image, and avoiding any interference patterns.

Abstract: The invention relates to a projection device for projecting an image comprising a light source (1), electro-optical light modulation (22) and image projection means (12) for projecting the image. In order to provide a projection device that can be used and is optimized for different modes, such as for video applications and business applications, the projection device according to the present invention further comprises a switchable module (3) comprising at least a first submodule (31), and a mode selection unit (20) for controlling said module (3) such that said first submodule (31) is either active or not active in the light path from said light source (1) to said image projection means (12), said first submodule (31) being adapted to improve the center brightness and white point of the light.

Abstract: A liquid crystal display system comprising: a. a dichroic mirror (2) arranged to direct first and second spectral components along a first processing path (A) and to direct a third spectral component along a second processing path (B); b. a first cubic polarizing beam splitter (4) arranged to direct the first and second components towards first and second liquid crystal on silicon (LCoS) panels (18, 22), respectively, and to direct the first and second components, after modulation, along a third processing path (C); c. a second cubic polarizing beam splitter (6) arranged to direct the third component towards a third LCoS panel (28), and to direct the third component, after modulation, along a fourth processing path (D); d. a cubic dichroic beam splitter (8) arranged to direct said first and second components and said third component along a fifth processing path (E); and e. three post analyzers (30, 32, 34) arranged on an external output face of the dichroic beam splitter.