Abstract: A projection system is provided. The projection system comprises a first light source module, a second light source module, a prism module, a projection lens and a digital micromirror device (DMD). The two light source modules provide a first light beam and a second light beam according to the specific timing sequences respectively. The prism module is defined with a first reflection mechanism and a second reflection mechanism. The DMD comprises a plurality of micro mirrors. After traveling into the prism module and being reflected by the first reflection mechanism, the first light beam is emitted onto the micro mirrors. The first light beam is adapted to be reflected onto the projection lens and images onto the screen while the micro mirrors are tilted at a first angle. After traveling into the prism module and being reflected by the second reflection mechanism, the second light beam is emitted onto the micro mirrors.

Abstract: [Subject] A picture display apparatus is provided which can be miniaturized and has high illumination efficiency. [Means for Solving the Problems] A picture display apparatus includes a light source; a light-condensing optical system which condenses rays of light from the light source to form an imaginary secondary light source; an optical member on which the rays of light that are condensed by the light-condensing optical system are incident; a right-angle prism through which the rays of light that exit from the optical member pass; a relay lens through which the rays of light that exit from the right-angle prism pass; an image forming element on which the rays of light that exit from the relay lens are incident; and a projector lens on which the rays of light that pass through the image forming element are incident, and which magnifies and projects the rays of light incident on the projector lens.

Abstract: A liquid crystal projection system includes a light source module, a light management module, an image signal module and a projection lens. The light source module provides an illumination light beam of first polarization state. The light management module includes a color separator for separating the illumination light beam into a first color light beam and a bichromatic light beam, first and second reflectors for respectively reflecting the first color light beam and the bichromatic light beam, a phase plate for converting the polarization of the bichromatic light beam, a first PBS for receiving the first color light beam, a second PBS for receiving the bichromatic light beam, and a dichroic prism for separating the bichromatic light beam into second and third color light beams. The image signal module includes three image modulation units for transforming the polarizations of the first, second and third color light beams and modulating them into image light beams carrying corresponding image signals.

Abstract: A color-mixing laser module is disclosed, which is comprised of a laser unit capable of emitting red, blue and green laser beams; a beam combiner, for receiving and converging the laser beams emitted from the laser unit and then directing the converged laser light to illuminate on a light pattern adjusting unit; and the light pattern adjusting unit, capable of receiving the converged laser light from the beam combiner for adjusting the pattern of the same.

Abstract: A projection system incorporating a prism with dual total internal reflection function, to increase the performance of DLP™ projection, by offering a solution to combine 2 light paths to contribute to the brightness on the screen and at the same time rejecting flat-state and off-state light from entering the projection lens thereby enhancing contrast. In one implementation those two light paths can be collecting light from 2 different light sources which are driven in a pulsed manner with a duty cycle of approximately 50% for each of the two light sources at increased power. In a second implementation with a colour sequential single DMD™ projector, while one light path passes a primary colour the second light path passes the complementary secondary colour. A special colour transformation algorithm is proposed to transform the image input signals to make optimal use of the capabilities offered by the second implementation, and create maximum brightness and colour saturation of the image.

Abstract: An illumination apparatus includes a light source (1), a first integrator (11) into which light from the light source (1) enters, and a second integrator (33) into which light exiting from the first integrator (11) enters. Accordingly, the aperture shape of the first integrator (11) can be optimally designed, so that the light utilization efficiency can be increased. Furthermore, even when the length of the first integrator (11) is reduced, a deficiency in the light uniformity due to the first integrator (11) is compensated for by the second integrator (33), so that high uniformity can be secured at the surface to be illuminated.

Abstract: An optical system is provided. The optical system comprises a first polarizing beamsplitter (PBS), a first reflecting image-forming device, and a first quarter-wave retarding element. An optical system is also provided that comprises an image-forming device, a reflective polarizing layer, at least a first birefringent element disposed on an optical path between the image-forming device and the polarizing layer, and a quarter-wave retarding element. Further provided is an optical system comprising a color combiner unit, at least two polarizing beamsplitters (PBSs), and a first quarter-wave retarding element. The present application also provides methods of compensating for birefringence in an image projection system.

Abstract: An illumination system including a first light emitting chip, a chip package, a first dichroic film, and a second dichroic film is provided. The first light emitting chip emits a first light beam. The chip package includes a second light emitting chip and a third light emitting chip. The second light emitting chip emits a second light beam. The third light emitting chip emits a third light beam. The colors of the first, second, and third light beams are different from each other. The first dichroic film is disposed in the transmission paths of the first and second light beams. The second dichroic film is disposed in the transmission paths of the first, second, and third light beams. The first and second dichroic films are not parallel to and do not intersect each other. Besides, a projection apparatus employing the illumination system and another projection apparatus are provided.

Abstract: The invention was made to provide a light source unit which can enhance the utilization efficiency of the dichroic prism which emits light that is emitted from a plurality of light sources in a direction which is parallel to an optical axis and a projector which employs the light source. The light source unit has a first light source, a second light source and a third light source which have different colors and includes a substantially cubical dichroic prism which combines light from the respective light sources for emission thereof. One of surfaces which intersect an optical axis of the dichroic prism is made to constitute a first incident surface, a surface which faces the first incident surface is made to constitute an emitting surface, and side surfaces are made to constitute a second incident surface and a third incident surface, respectively.

Abstract: Disclosed is a lighting optical system, including: a lighting optical system, comprising, a light separating means for separating incident light into three colored lights according to wavelength bands, and progressing the three separate colored lights for the same amount of distance from a light source of the incident light through different optical paths, and emitting the three separate colored lights to a first, a second and a third LCD, a first, a second and a third LCD for respectively receiving the three colored lights from the light separating means, and forming images therefrom; and a light combining means for synthesizing the three colored lights emitted from the first, second and third LCD, and outputting the synthesized light outside.

Abstract: A multi-colored illumination system comprising a beam combiner. The beam combiner comprises two triangular prisms and a filter for transmitting a first light and reflecting a second light, each light having a different wavelength. The beam combiner combines the transmitted first light and the reflected light to provide a combined beam. The six surfaces of each of the triangular prism of the beam combiner is polished, thereby combining the lights without increasing etendue of the multi-colored illumination system.

Abstract: A multi-colored illumination system including a beam combiner. The beam combiner includes two triangular prisms and a filter for transmitting a first light and reflecting a second light, each light having a different wavelength. The beam combiner combines the transmitted first light and the reflected light to provide a combined beam. The six surfaces of each of the triangular prism of the beam combiner are polished, thereby combining the lights without increasing etendue of the multi-colored illumination system.

Abstract: An image projection system having a first light emitting diode subsystem configured to generate a first source beam having a first spectral range in a first polarized state and a second light emitting diode subsystem configured to generate a second source beam having a second spectral range overlapping the first spectral range is provided. The second source beam may be provided in a second polarized state orthogonal to the first polarized state of the first source beam. The image projection system may further include an x-cube prism configured to receive the first source beam and the second source beam and combine the first source beam and the second source beam to form a common output beam.

Abstract: A light source device includes a first light source, a second light source, a reflective assembly, and a condensing lens defining an optical axis. The first light source includes a first lamp and a first reflector reflecting light beams generated by the first lamp as first parallel light beams. The second light source includes a second lamp and a second reflector reflecting light beams generated by the second lamp. The first light source, the reflective assembly and the condensing lens are arranged in order along the optical axis. The second light source corresponds to the reflective assembly deviated from the optical axis. The reflective assembly reflects light beams reflected by the first reflector back to the first reflector, and reflects light beams from the second reflector to the condensing lens. The condensing lens condenses the first parallel light beams and the light beams reflected by the reflective assembly.

Abstract: An image display apparatus for a viewer to view a two-dimensional image demonstrated on an image display device as an enlarged virtual image by a virtual-image optical system. The image display apparatus includes a prism and a reflective transmitting surface for reflecting or transmitting image light incident from an incident optical surface. The image display apparatus also includes a reflective optical component for reflecting image light reflected from the reflective transmitting surface and radiated from a first planar optical surface towards the reflective transmitting surface as a collimated light beam and a phase difference optical component arranged on a light path between the first planar optical surface and the reflective optical component to the state of polarization of the image light.

Abstract: The present invention is a 3D/2D convertible color projection display system with two color LCoS panels, which enable the system to project two orthogonal polarized images. When the two images correspond to different view angles, each eye of an observer wearing a pair of polaroid glasses can only see one of the images, creating a 3D stereoscopic effect. When the two images correspond to the same view angle, then the observer, without any special glasses, can watch regular 2D images with multiple primary colors.

Abstract: A projection system includes a projection lens unit, a color combiner, and at least a first and a second image-forming devices for generating single color images. The single color images are combined in the color combiner to produce a colored image light beam. The colored image light beam passes from the color combiner to the projection lens system. A polarization control element is disposed between the color combiner and the first image-forming device. The polarization control element alters the polarization of light at either one of the first and second color, while not altering the polarization of light of the other of the first and second color. In some embodiments, the polarization control element is oriented to substantially prevent light at the second color from passing from the color combiner to the first image-forming device via a polarizing beamsplitter.

Abstract: A method of designing a backlight light guide for an autostereoscopic 3D display includes specifying a backlight having a light guide thickness and extractor angle and a light transmission surface having a predetermined width value and a predetermined length value. Then, the method includes selecting a plurality of design parameter value pairs, where each parameter value pairs includes a light guide thickness value and a prism angle value, and each design parameter value pair is different from each other. Then the method includes executing an ray tracing optical model on the light guide for each parameter value pair to calculate output data for each parameter value pair, the output data including a single pass light extraction efficiency value, an average minimum light angle value emitted from the second surface, and a maximum flux/minimum flux value emitted from the second surface; and selecting a parameter value pair based on the output data to manufacture the light guide for an autostereoscopic 3D display.

Abstract: A projection apparatus and a light guide module for use in the projection apparatus are provided. The projector apparatus comprises an illumination mechanism, at least one digital micromirror device (DMD), and a light guide module, wherein the light guide module includes a plurality of interfaces. The illumination mechanism provides a light beam which travels through the plurality of interfaces of the light guide module along a first axis without any rotation. The light beam orderly performs total internal reflections on each of the interfaces of the light guide module. Accordingly, the light beam travels to the at least one DMD, and then the light beam is reflected along a second axis.

Abstract: Exemplary embodiments provide a projection-type display apparatus, which can address or realize a reduction in weight and size, a reduction in power consumption, and a reduction in noise, and address or realize a reduction in price, and a control method for the projection-type display apparatus, as well as a control program for the projection-type display apparatus. The projection-type display apparatus includes a solid-state light source that emits light, a mirror device that controls an emitting direction of the incident light to thereby subject the incident light to temporal modulation, and a projecting device that projects the modulated light.

Abstract: An optical system for a projection device is disclosed. The projection device includes three different light sources, three condensers corresponding to the light sources, an integrator, an optical lens array, a total internal reflection prism, a digital micro-mirror device and a projection lens. The light sources generate light transmitting through the condensers, the integrator, the optical lens array, the total internal reflection prism, and the digital micro-mirror device into the projection lens. The optical system includes an emitting and reflecting module emitting and reflecting light from the light sources to the integrator and comprises a first, second emitting and reflecting mirrors intersecting thereto, the intersections of the first, second emitting and reflecting mirrors facing the corresponding light sources and condensers.

Abstract: Prism elements having TIR surfaces placed in close proximity to the active area of a SLM device to separate unwanted off-state and/or flat-state light from the projection ON-light bundle. The TIR critical angle of these prisms is selected to affect either the off-state light or additionally, any portion of flat-state light reflected from the SLM. These TIR surfaces are placed to immediately reflect the unwanted light as it comes off the SLM, thereby preventing the contamination of light along the projection path, which tends to degrade the system contrast. To further improve the optical performance of the system, these TIR prisms can be attached directly to the SLM package, completely eliminating the package window. Also, these TIR prism can be coupled to DMDs having asymmetric mirrors, which tilt through a larger angle for the ON-light to provide high etendue and lumen output, but through near-zero degrees for the OFF-light, thereby improving the separation of any unwanted light from the off/flat states.

Abstract: A prism structure that includes: a plurality of liquid crystal devices each include a liquid crystal panel and a light emitting-side optical element, and generate an image light through modulation of any of a plurality of color lights in accordance with image information; and a cross dichroic prism that combines the image lights coming from the liquid crystal devices. In the prism structure, each of the liquid crystal devices further includes: a fixture member that is fixed to the cross dichroic prism; a retention member that keeps hold of the liquid crystal panel, and is fixed to the fixture member; and a light emitting-side optical element retention member that keeps hold of the light emitting-side optical element, and is rotation-adjustable about an illumination axis. The light emitting-side optical element retention member is rotation-adjusted about the illumination axis before fixation to the retention member.

Abstract: An optical element for compensating for aberrations in a projected image resulting from an air gap between adjacent segments of a separation prism includes a first surface and a second surface opposite said first surface. Each of the first and second surface define a portion of a cylinder having a radius and a cylindrical axis. The optical element is disposed between the separation prism and the projected image. A thickness of the optical element and the radius of the cylinder are selected to correspond to the aberration to be compensated and the cylindrical axis is oriented to correspond to the aberration to be compensated.

Abstract: A high resolution projection system has a light source for generating and emitting light and a plurality of digital micromirror device imagers configured to receive and reflect the light.

Abstract: An optical imaging system including an illumination system, a Cartesian PBS, and a prism assembly. The illumination system provides a beam of light, the illumination system having an ƒ/# less than or equal to 2.5. The Cartesian polarizing beam splitter has a first tilt axis, oriented to receive the beam of light. A first polarized beam of light having one polarization direction is folded by the Cartesian polarizing beam splitter and a second polarized beam of light having a second polarization direction is transmitted by the Cartesian polarizing beam splitter. The Cartesian polarizing beam splitter nominally polarizes the beam of light with respect to the Cartesian beam splitter to yield the first polarized beam in the first polarization direction. The color separation and recombination prism is optically aligned to receive the first polarized beam. The prism has a second tilt axis, a plurality of color separating surfaces, and a plurality of exit surfaces.

Abstract: A wide gamut high resolution projection system has a light source for generating and emitting light, a prism assembly for separating the light into six primary color light beams, and a plurality of digital micromirror device imagers configured to receive and reflect the primary color light beams.

Abstract: An image synthesizing device for a projector apparatus includes first, second, third polarizing beam splitters respectively provided for red light, green light, and blue light; and a light combining unit configured to combine and output the red light, the green light, and the blue light passing through the first, second, and third polarizing beam splitters. The first, second, and third polarizing beam splitters respectively include first, second, and third polarizing films. The first and second polarizing films where the red light and the green light enter are each formed of an organic material, and the third polarizing film where the blue light enters is formed of an inorganic material.

Abstract: A projection system includes a multi-laser beam generator, a beam switching device, a split beam projecting device and a transmissive light valve. The multi-laser beam generator selectively generates a red beam, a green beam and a blue beam. The beam switching device receives the red, green and blue beams, splits the red, green and blue beams into a plurality of light beams of different angles, and directs the red, green and blue beams of the different angles into a common optical path. The split beam projecting device includes a plurality of micro-lenses. The transmissive light valve has a plurality of pixels for receiving the red, green and blue beams that are guided by the split beam projecting device. The red, green and blue beams of the different angles are received by the micro-lenses and guided onto the pixels of the transmissive light valve for imagining on the pixels.

Abstract: A transmissive LCD is placed in optical series with pixels of an image. The transmissive LCD is set to full transmissivity when bright pixels of the image pass through the transmissive LCD. Transmissivity is decreased where pixels darker than a darkening threshold pass through the transmissive LCD. A darkening curve representative of an amount of darkening performed by the transmissive LCD provides an amount of darkening to be performed on each pixel. Preferably, the darkening curve gradually darkens pixels more as the pixels themselves are darker. The darkening curve may be implemented as a formula or a look-up table in software or drive electronics that energize the transmissive LCD. Both the darkening threshold and the darkening curve may be user selectable.

Abstract: A projection system is provided. The projection system comprises a first light source module, a second light source module, a prism module, a projection lens and a digital micromirror device (DMD). The two light source modules provide a first light beam and a second light beam according to the specific timing sequences respectively. The prism module is defined with a first reflection mechanism and a second reflection mechanism. The DMD comprises a plurality of micro mirrors. After traveling into the prism module and being reflected by the first reflection mechanism, the first light beam is emitted onto the micro mirrors. The first light beam is adapted to be reflected into the projection lens and image into the screen while the micro mirrors are at a first angle. After traveling into the prism module and being reflected by the second reflection mechanism, the second light beam is emitted onto the micro mirrors.

Abstract: An illuminating apparatus includes a polarized light beam splitter, a first polarized light source device, and a second polarized light source device. The first polarized light source device has a first light source device, a first polarized light separation prism, and a first polarization element. The second polarized light source device has a second light source device, a second polarized light separation prism, and a second polarization element. The illuminating light flux having the first polarized light component emitted from the first polarized light source device and illuminating light flux having the second polarized light component emitted from the second polarized light source device are both linear polarized light components and have different polled light axis from each other.

Abstract: A projection apparatus (10) has an LC modulator panel (60) with photoresponsive layer, segmented into at least first, second, and third portions, each spatially separated. An image writing section (120) forms a first, second, or third image within the corresponding portion of the LC modulator panel by scanning successive lines of image writing light to energize the photoresponsive layer (316). The image writing section has at least one grating electromechanical system for modulating incident emission from a narrow-band light source (70) by providing diffracted and non-diffracted orders and a scanning element for directing a line of light thus formed toward the LC modulator panel to energize the photoresponsive layer. An illumination section (130) directs first, second, and third illumination beams for modulation by the respective portions of the LC modulator panel.

Abstract: A liquid crystal projection system has a dichroic mirror, a reflecting prism, a first and a second polarizing component, a dichroic component, a modulating device, and a projection lens. The dichroic mirror splits a polarized light source into dual primary color lights and a single primary color light. The reflecting prism receives the single primary color light and reflects it. The first and second polarizing components polarize the dual primary color lights and the single primary color light, respectively. The dichroic component is disposed beside the first polarizing component, and splits the dual primary color lights. The modulating device is disposed beside the second polarizing component and the dichroic component, and modulates the dual and single primary color lights into the other polarization and then reflects them. The projection lens is disposed beside the first polarizing component, and project the output light beam to a screen.

Abstract: The invention relates to a scanning image projector that facilitates making the whole optical system compact while making it easy to control an image being projected. The scanning image projector comprises a light source unit that gives out a light beam modulated on the basis of image information, a deflector that reflects the light beam for deflecting and scanning it in a two-dimensional direction, and a projecting optical system that projects a light beam reflected by the deflector toward a projection direction to form a two-dimensional image. The projecting optical system 6 comprises a plurality of reflecting surfaces 12, 13 tilted with respect to a chief ray of a light beam leading to the center of the projected image. At least one of the plurality of reflecting surfaces 13, 14 is a curved reflecting surface of concave shape at a position where the chief ray 21 of a light beam leading to the center of the projected image goes by.

Abstract: For combining light from different light sources that are spatially apart, an optical system comprises a prism assembly that comprises a totally-internally-surface and a dichroic filter. The totally-internally-surface and the dichroic filter are configured for reflecting light of different colors or polarizations, so as to combine light of different polarization or colors into a single beam.

Abstract: Provided is a projection optical system which includes a first optical part which projects an image; a second optical part having an image forming device, which forms an image using a light and emits the image to the first optical part; a third optical part having at least one light source which emits the light; and a deflector which guides the light emitted from the third optical part toward the second optical part, wherein an optical axis of the third optical part is angled toward an optical axis of the second optical part, and an optical axis of the first optical part and the optical axis of the second optical part are parallel to each other and separated from each other.

Abstract: Provided is a projection optical system including a first part which projects an image; a second part having an image forming device which forms an image using a light and emits the image to the first part, and having an axis angled toward an axis of the first part; a third part including at least one light source, which emits the light, and having an axis angled toward the axis of the second part; and a deflector which guides the light emitted from the third part toward the second part, wherein a pupil plane of the second part is located between the first part and the second part, and a cross-point between the axis of the first part and the pupil plane of the second part is separated from a cross-point between the axis of the second part and the pupil plane of the second part.

Abstract: A projection type image display apparatus is provided which includes a housing to hold an optical system including multi-lenses, a polarized-light conversion element and the color separation portion The housing operates to provide an optical path between a light source, located outside the housing, and penetration-type image display elements and an optical synthesizing portion also located outside of the housing.

Abstract: The invention provides an optical device, including a light-transmitting substrate, optical means for coupling light into the substrate by total internal reflection, and a plurality of partially reflecting surfaces carried by the substrate, characterized in that the partially reflecting surfaces are parallel to each other and are not parallel to any of the edges of the substrate.

Abstract: A projector can form images of illumination system on respective optical paths at positions of corresponding liquid crystal display panels with respect to a light emission surface of a cross dichroic prism without relatively inverting the images and without increasing the number of lenses from the number of lenses included in a relay optical path structure in related art. Moreover, the projector can equalize the magnification of the images formed on the respective liquid crystal display panels by controlling relative image-forming conditions of the first and second optical paths in advance. Thus, deterioration of white balance and color unevenness of light projected by the projector can be reduced even when light emission distribution of a light source varies with elapse of time, for example.

Abstract: An illumination unit includes multiple light source units to emit light having different wavelengths, and a synthesizing prism to synthesize the emitted light. The synthesizing prism includes a first triangular prism (tp) having a first outer surface (os) to transmit (reflect) the light according to the light's input a direction, and first and second boundary surfaces (bs), a second tp having a second os to transmit the light, a third bs facing the second bs, and a fourth bs, a third tp having a third os to transmit (reflect) the light according the light's input direction, a fifth bs facing the fourth bs, and a sixth bs facing the first bs, and a color separation portion arranged at least one of positions between the second and third bs, the fourth and fifth bs, and the sixth and first bs, to selectively transmit (reflect) the light according to wavelengths thereof.

Abstract: A first light output unit integrally has a first light source and a first prism, a second light output unit integrally has a second light source and a second prism, and a third light output unit integrally has a third light source and a third prism. A first surface of the first prism and a second surface of the second prism are adhered together by an adhesive with a first film located therebetween, and first film passes green laser light and reflects blue laser light. A third surface of the second prism and a fourth surface of the third prism are adhered together by an adhesive with a second film located therebetween, and second film passes the green laser light and the blue laser light, and reflects red laser light.

Abstract: A projection apparatus (10) has an LC modulator panel (60) with photoresponsive layer (316), segmented into a first, second, and third portion, each spatially separated. An image writing section (120) forms a first, second, or third image within the corresponding portion of the LC modulator panel by scanning successive lines of image writing light to energize the photoresponsive layer. The image writing section has at least one grating electromechanical system for modulating a narrow-band light source (70) by providing diffracted and non-diffracted orders and a scanning element (98) for directing a line of light toward the LC modulator panel to energize the photoresponsive layer. An illumination section (130) directs the illumination beams for modulation by the LC modulator panel. Polarizing beamsplitter (24r, 24g, 24b), polarize and direct the illumination beams toward the LC modulator panel and directs modulated light toward projection lens (32).

Abstract: The projector apparatus of the invention constructs colored imaging light by splitting a beam of light received from a light source into beams of three primary colors and inputting the beams of three primary colors in an image synthesizing device via light adjusting device. The image synthesizing device includes a prism, a prism mount for fixing the prism, LCPs, and LCP holders integral with the prism mounts for fixing the LCPs. The prism mount has a central area and multiple peripheral areas, each area in contact with the prism. The invention provides effective solution for solving reliability problems encountered in a cost reduction strategy for miniaturization of a prism and for using inexpensive plastic prism fixation members.

Abstract: A projection apparatus includes a first, a second and a third light sources, a first reflective element, a first and a second dichroic mirrors, a light-homogenizing element, a light valve and a projection lens. The first reflective element is configured to reflect the first light beam, and the first dichroic mirror is configured to reflect the second light beam and to transmit the first light beam transmitted from the first reflective element. The second dichroic mirror is configured to reflect the first and the second light beams transmitted from the first dichroic mirror and to transmit the third light beam. The light-homogenizing element is used for homogenizing the combined light beam, and the light valve is used for modulating the combined light beam to form an image beam. The projection lens is used for receiving and then projecting the image beam.

Abstract: A projection device is disclosed. The projection device comprises a plurality of LEDs (202, 204, 206) each generating light of a known wavelength, a light path associated with, and receiving the light from, each of the LEDs, each light path comprising a VA wavelength retarder (213, 223, 233), a first optical selection means (243, 253, 263)) providing orientation of a known direction to light applied thereon, the first optical selection means further reflecting light having an orientation not in the known direction, an LCD panel (232, 234, 236, and a second optical selection means (245, 255, 265) providing orientation of light applied thereon substantially orthogonal to the first known direction, and a recombination cube (240) in communication with each of the light paths for recombining the light received from each of the light paths, wherein the orientation of light received from at least one light path is substantially orthogonal to the orientation of light received from the remaining light paths.

Abstract: An illumination apparatus for a digital image projector, the illumination apparatus has a plurality of solid-state laser arrays, each laser array with one or more rows of laser. A light combiner has an output optical axis and a plurality of light-redirecting prisms arranged in a stack. Each light-redirecting prism has at least one contact surface that extends parallel to the output optical axis and is in optical contact with an adjacent prism in the stack and a light redirecting facet that is disposed at an oblique angle to the at least one contact surface.

Abstract: A polarization conversion system includes at least one beam splitting and combining unit having a polarization beam splitting element and a dichroic element, a dichroic unit, a polarization beam splitting unit, a first half wave plate (HWP) and a second half wave plate. The polarization beam splitting element reflects a first portion beam of the first light beam and allows a second portion beam of the first light beam to pass through. The dichroic unit reflects the first portion beam. The polarization beam splitting unit reflects a third portion beam of a second light beam and allows a fourth portion beam of the second light beam to pass through, and the dichroic element reflects the third portion beam. In addition, the first HWP is disposed between the beam splitting and combining unit and the polarization beam splitting unit, while the second HWP is disposed between the beam splitting and combining unit and the dichroic unit.

Abstract: The present invention provides a projection apparatus, comprising: a light source; a plurality of spatial light modulators each comprising a micromirror for modulating and deflecting an incident light emitted from the light source in an intermediate direction between a first and a second directions and all angles between the first and second directions The projection apparatus further includes a projection optical system for projecting a modulation light modulated by the spatial light modulator The projection apparatus further includes a first joinder prism comprising a first optical surface with at least two of the incident lights with different frequencies projected thereto, a second optical surface for ejecting the incident light incident from the first optical surface and for projecting the modulation light thereto, and a selective reflection surface for reflecting the incident light incident from the first optical surface and transmitting the modulation light.