Abstract: An image edge blender (58) of this invention installs in an unmodified projector (50) in place of the projection lens (52), which then installs at the output end of the image edge blender assembly. The image edge blender includes a relay lens (64) that relays an objective image plane (66) formed in the projector to an intermediate focal plane (68) formed within the image edge blender. An adjustable aperture assembly (70) includes at least one shutter (96) positioned at or near the intermediate focal plane and movable in rotational, parallel, and transverse directions relative to-the optical axis (78).

Abstract: A digital cinema projection system (200) for projecting images onto a display screen. The projection system (200) comprises a lamp console (102) and a projector (202). The projector (202) receives digital image data, processes the digital image data to create an image data stream that is compatible with the chosen spatial light modulator, and uses the processed image data to modulate a beam of light from the lamp console (102). A primary projection lens (204) and lens adapter mounted on a rotatable turret (206) focus the modulated light onto a display screen. Alternatively, an integrated anamorphic projection lens is used to eliminate the need for a separate lens adapter.

Abstract: A single-panel liquid crystal rear side projection type image display apparatus, which is compact in size and can satisfy requirements of both brightness and color purity and can focus images very sharply with the contrast property improved significantly and with less screen distortion, and a projection lens unit comprising three lens groups of about F1.5, which is composed so as to cool the video generator with a cooling liquid and is provided with first to third dichroic mirrors DM1, DM2, and DM3 for separating a white light into the three primary colors in order of red, blue, and green.

Abstract: A laser video projector using an optical pumping valve is provided. The video projector according to the present invention forms an image using an optical pumping valve including a laser resonator for resonating light of a certain wavelength, an optical pumping source for performing pumping so that the laser resonator can generate a laser beam, and an optical valve for filtering the laser beam emitted from the laser resonator so that the filtered laser beam forms a picture instead of a cathode ray tube (CRT).

Abstract: Image display apparatus (10) for improving the display of moving images, which image display apparatus comprises control means (16) for eliminating or reducing smear caused primarily by a zero-order hold characteristic of a light-valve image display device (10), the control means (16) being such that it eliminates or reduces the zero-order hold characteristic by superimposing a decay characteristic onto light incident upon the light-valve image display device (10), and the control means (10) being such that it superimposes the decay characteristic by reducing the pixel intensity before the pixel intensity is updated in a next frame.

Abstract: An illuminating device comprising a light source for emitting a plurality of light beams (207, 208, 209) of different colors, a plurality of rotating beam scanners (102, 103, 104) and a plurality of scanning lenses (109, 110, 111). The beam scanners have spiral reflection surfaces (102, 103, 204) formed on the outer peripheries of cylindrical bodies, Each colored light beam is shone onto each reflection surface from a direction parallel to a rotating axis, and magnified by each scanning lens after reflected to scan an illuminated area with a plurality of beams of different colors one after another. Accordingly, the illuminating device can enhance scanning linearity, reduce noise due to a minimal windage loss, and decrease costs and power consumption.

Abstract: Disclosed is an optical display system and a method for increasing the resolution of an display device. The optical display system includes a display device which includes a pixel and a holographic optical element positioned in front of the pixel. The holographic optical element is configured to diffract a portion of the incident light from the pixel toward a user of the display system such that two or more pixels may be perceived by the user.

Abstract: A projection display is used to process a light beam that includes first, second and third color components and that is to be provided to a projection lens. The projection display includes a dichroic beam splitter which separates the first color component from the second and third color components. A first polarization beam splitter prism cooperates with a first reflective light valve to process the first color component. A second polarization beam splitter prism cooperates with second and third reflective light valves to process the second and third color components. A third polarization beam splitter prism is disposed so as to direct the processed color components from the first and second polarization beam splitter prisms to the projection lens.

Abstract: A method for the elimination of image speckles in a scanning laser projection is suggested, in which a phase hologram is used for dividing the illumination beam of the projector into partial beams. The partial beams are heterodyned again on the image screen within the image element (pixels) to be projected in such a way that differing speckle patterns are formed which average each other out in the eye of the viewer over time and/or space. Thus, a device is provided especially for the laser projection which substantially eliminates or reduces the speckles at the viewer. However, the beam form and the beam density are hardly or not changed.

Abstract: An optical apparatus for irradiating light emitted from a light source onto a predetermined object, comprising a polarized light separating optical element for passing a first of two linearly polarized light beams polarized in directions perpendicular to each other and reflecting a second of said two linearly polarized light beams of light emitted from said light source; a phase shifter for converting said first linearly polarized light beams passed from said polarized light separating optical element into substantially circularly polarized light; and a reflecting mirror for reflecting said substantially circularly polarized light passed from said phase shifter back toward and through said phase shifter so that said circulatory polarized light is converted into a third linearly polarized light beam, wherein light emitted from said polarized light separating element, passed through said phase shifter, reflected by said reflecting mirror, and passed back through said phase shifter is irradiated on said predeter

Abstract: A video image projection apparatus is disclosed. The apparatus uses a laser as a light source and modulates the light beam using a modulator according to an image signal. The apparatus projects the modulated light to a screen using a light scanning system. The laser display system includes three primary color laser light sources, an optical system needed for three-color light combining/separation, a light modulator loading the image signal into the three-color laser, and a driving circuit driving the system by processing the video signal electronically. A hybrid video laser color mixer has a structure that combines very small-sized hybrid light beam combining/separation optical elements and a 3-channel light modulator. It allows the size of the image projection apparatus to be about 6 by 5 by 3 centimeters. Additionally, the light alignment of the elements is close to self-alignment.

Abstract: A projection display system may be mechanically perturbed to remove or reduce speckle. In addition, pixellation effects may also be removed or reduced. By mechanically disturbing a portion of the system, for example using a wobble perturbation, the speckle effects may be temporally smeared so that they become invisible to the user. In one embodiment of the present invention, a folding mirror may be mechanically perturbed, using a plurality of piezoelectric actuators, at frequencies in the ultrasonic range.

Abstract: A television receiver (10) that has a spatial light modulator (15) and a projection lens (17a) and that projects images to a screen (18). If the aspect ratio of the image to be displayed does not match that of the spatial light modulator (15), an anamorphic lens (17b) is positioned in the optical path of the image, between the projection lens (17b) and the screen (18). In this case and in typical applications, the spatial light modulator (15) generates an image that is anamorphically squeezed in the horizontal dimension, and the anamorphic lens (17b) widens the image so that the viewer perceives a normal wide-screen image on the screen (18).

Abstract: A projection type color liquid crystal display apparatus includes: light collimation means for producing collimated light; main-wavelength band separation means for receiving the collimated light from the light collimation means and producing a plurality of light beams having respectively different wavelength bands and exiting at respectively different angles; sub-wavelength band separation means provided adjacent the main-wavelength band separation means, the sub-wavelength band separation means receiving the collimated light from the light collimation means and producing at least one light beam having the same wavelength band as the wavelength band of at least one of the light beams from the main-wavelength band separation means; a liquid crystal display device for receiving the light beams from the main-wavelength band separation means and the light beams from the sub-wavelength band separation means and modulating the light beams; and an optical system for receiving the light beams transmitted through the

Abstract: A picture display method and apparatus in which a light source is lengthened in service life and optimum color reproduction is realized, while the light utilization efficiency is improved to reduce the power consumption and the size of the apparatus. The red, green and blue illuminating light beams radiated from the light-emitting diodes 12R, 12G and 12R, are illuminated via relay lenses and field lenses on picture display light valves 11R, 11G and 11B and spatially modulated in intensity so as to be synthesized by a synthesis prism 10 and so as to be projected to an enlarged scale on a screen 17. The profile of the light radiating portions of the light-emitting diodes 12R, 12G and 12B are set so as to be the same or similar to the profile of a picture display area of each of the picture display light valves 11R, 11G and 11B in order that the profile of the light beam illuminated on the picture display area will be in keeping with the profile of the picture display area.

Abstract: In a device for the deflection of a light bundle generated by a light source, wherein this device has a nonmechanical deflection device in which the light bundle enters and exits at a different angle determined by a controlling variable, which angle depends on the wavelength of every light component in the light bundle, it is provided that an optically dispersively active system is provided behind the nonmechanical deflection device in the light propagation direction, wherein the angular dispersion of this system is dependent on the angle of the light bundle entering the system, wherein the angular dispersion compensates for the wavelength dependence of the angle of the nonmechanical deflection device determined by the controlling variable.

Abstract: A video display system utilizing a video source and an image intensifier having a substrate. A video image source positions at the substrate to provide a photon signal. A photocathode element at the substrate converts the photon signal into electrons. An optically transparent body having first and second surfaces is placed opposite the substrate spaced therefrom. A vacuum chamber is formed between the substrate and the first surface of the second optically transparent body. A fluorescing layer is positioned on said first surface of the second optically transparent body. A source of electrical power provides a voltage potential between the photocathode layer and said fluorescing layer. The intensified video image exits the second surface of the second optically transparent body for viewing.

Abstract: In a process for generating at least three laser beams of different wavelengths for displaying color video pictures, a pulsed laser is used to generate light. The light output of the pulsed laser is released in a pulse and is introduced into a medium with nonlinear optical characteristics for generating a laser beam. In addition to the laser beam generated by excitation, this medium releases an additional laser beam whose frequency is given by the sum or difference frequencies of the exciting laser beam and the excited laser beam due to the nonlinear optical characteristics of the medium. The laser beams generated by the medium in this way and the exciting laser beam are used directly, or after frequency conversion, to display monochromatic partial images of a color video picture. An apparatus according to the invention contains suitable devices for carrying out the process.

Abstract: In a rear projector with a housing on whose front side is arranged a screen for displaying a video picture, with a brightness-modulated and color-modulated R-G-B light source for emitting a light bundle, with a deflecting device for scanning this light bundle, wherein the light bundle is deflected by the deflecting device over a total angle &agr; with respect to vertical scanning, and with a deflecting mirror which is located in the housing and arranged at an angle &dgr;, wherein the light bundle exiting from a real or virtual vertex of the total deflection angle &agr; is deflected onto the screen by the deflecting mirror, the virtual or real vertex located in front of the deflecting mirror lies at a location where the smallest angle &bgr; of the light bundle to the surface of the screen during deflection is less than 20° and the angle &dgr; is given by δ ≤ 45 ⁢ ° - α 4 + β

Abstract: A projection type picture display apparatus, includes a light source; a polarizing beam splitter capable of reflecting or transmitting an incident light; a decomposing/synthesizing prism assembly capable of receiving a reflected light from the polarizing beam splitter to decompose the incident light into red, green and blue lights, also capable of receiving reflected red, green and blue lights to synthesize these lights so as to produce a synthesized light; a plurality of reflective type liquid crystal displays capable of receiving, modulating and reflecting red, green and blue lights; a projection optical system capable of receiving a picture light passing through the polarizing beam splitter to project an enlarged picture on a screen.

Abstract: In a color projection display system having a source of white light, an electro-optic light modulator for modulating the light in accordance with a display signal, a projection lens, and dichroic filters for separating the white light into color components prior to modulation, and for recombining the modulated color components prior to projection, the color uniformity of the display is improved by designing the filters to have different cut-off wavelengths of separation and recombination for at least one of the color components.

Abstract: A system for generating an image comprising an illumination system having a light source and a plurality of holographic devices switchable between an active state wherein light from the light source is diffracted by the device and a passive state wherein the light is not diffracted by the device. A display device is positioned for illumination by the illumination system and operable to project a display image. The system further includes an optical projection device operable to receive the displayed image and form an intermediate image having a generally uniform illumination distribution on an optical diffuser. The diffuser is operable to project a resultant image with an emission angle larger than an emission angle of the display panel.

Abstract: A display system includes blue, green, and red laser light sources and light shaping devices which receive the laser light from the laser light sources and shapes the light into a number of approximately identical beamlets. The beamlets are modulated individually and the modulated beamlets are combined. The combining results in an output of beamlets, each of which comprises three input beamlets of each of the colors red, green, and blue. The resultant beamlets can then be scanned onto a display screen.

Abstract: A system and a method for controlled concurrent viewing of images, in their entirety, by the use of a dual viewer controllable dual display system having the added capability of individually presented resolution is disclosed. In operation, a viewer first selected image is provided by a first controllable display device and a viewer selected second image, typically different from the first, is provided by a second controllable display device. A viewer looks through the second display and sees the image presented by the first display and the image presented by the second display provided at the plane of the first display. Additionally, the displays can be interactive, in that an image or event provided on one display results in the presentation of an image or other data on the other display, all the while allowing the viewer to select from other information. Also the position of one image can be varied with respect to the other image.

Abstract: The projection image display apparatus includes a plurality of image generating sources for generating three primary colors, including red, green, blue image light, respectively, and a projection lens containing a plurality of lens elements provided in correspondence with each of said image generating sources for enlarging/projecting images displayed by the image generating sources onto a screen. The projection lens corresponding to the red image generating source includes a light transmitter that satisfies the condition: TRS<TRL/3, wherein TRS is the transmittance with respect to a wavelength .lambda. RSmax of sub-peak energy of a spurious component existing in a short-wavelength-sided region rather than a peak energy waveform .lambda. Rmax of a spectral distribution of the red image light, and TRL is the transmittance with respect to a wavelength .lambda. RLmax of sub-peak energy of a spurious component existing in a long-wavelength-sided region rather than the peak energy wavelength .lambda.

Abstract: A projection display device wherein a modulated laser beam is scanned across a viewing surface by a system of rotating mirrors. A correcting mirror is provided for introducing small variations in the path of the beam. An instantaneous position of the beam on the viewing surface is monitored and a deviation between the actual pattern traversed by the beam and a predetermined scanning pattern is detected. The angular position of the correcting mirror is adjusted to reduce the deviation between the actual scanning pattern and the predetermined scanning pattern.

Abstract: A projection-type image display apparatus, includes: an illumination unit; a polarization selecting and reflecting element which splits a light beam from the illumination unit into a first light beam and a second light beam having polarization states different from each other, reflects the first light beam to the illumination unit, and outputs the second light beam as linearly polarized light; a transmission-type liquid crystal display panel which controls a polarization state of the linearly polarized light and displays an image; a first polarization selecting element and a second polarization selecting element respectively provided on a light beam input side and a light beam output side of the transmission-type liquid crystal display panel; a projection element which projects the image displayed by the transmission-type liquid crystal display panel.

Abstract: An image rotating apparatus presents a projected video image upon a rear projection screen that is rotated extremely rapidly about a vertical axis which exactly bisects the picture in the vertical plane. The rotational rate is such that an entire audience, regardless of their position about the apparatus, can view the projected video image simultaneously. The video image rotating apparatus utilizes light valve technology to create red, green and blue images from an analog composite video signal, and a Phillips prism that aligns the images produced by the light valves for projection through an optical system. The image produced by the light valves is rotated, either mechanically or electronically, in synchronization with rotation of the projection screen.

Abstract: A video display system includes a laser beam that is reflected from a vertical scan rotating mirror, then from a horizontal scan rotating mirror and then toward a viewing surface. The rotational angles of the mirrors and the intensity of the laser are controlled by a controller that is driven by a video signal. Rotation of the horizontal mirror scans the laser beam across the viewing surface while the laser intensity is modulated to form pixels on the viewing surface. The vertical scan mirror then directs the beam to the next horizontal scan line. The resolution and aspect ratio of the image are adjusted by changing the rotation rate of the mirrors and by changing the rate at which the laser is modulated.

Abstract: A laser projection display apparatus including an optical separating device for separating a white light beam emitted from a first optical source into red, green, and blue monochromic light beams, an image signal processing unit for separating a received composite image signal into an image signal and horizontal and vertical synchronous signals, an optical modulator for modulating the monochromic beams according to the image signal output by the image signal processing unit, a galvanometer and a rotating polygonal mirror for vertically and horizontally projecting the modulated beams, respectively, on a screen, a second optical source for radiating light on the reflection planes of the rotating polygonal mirror, and an optical detector for detecting light emitted from the second optical source and reflected by the reflection planes of the rotating polygonal mirror, and transmitting the detection signal to the image signal processing unit, when a starting point of horizontal projection by the rotating polygonal

Abstract: The present invention relates to a projection type image displaying apparatus capable of displaying larger picture images which are bright, uniform and after-image-free.

Abstract: An anamorphic lens (11) for use in a display system (10) that has a spatial light modulator (12) and a projection lens (13) and that projects images to a screen (14). The anamorphic lens (11) is placed between the projection lens (13) and the screen (14). The spatial light modulator (12) generates an image that is anamorphically squeezed in the horizontal dimension, and the anamorphic lens (11) widens the image so that the viewer perceives a normal wide-screen image on the screen (14).

Abstract: Method and apparatus for a multi-application, laser-array-based image system utilizes three linear laser arrays. Each linear array generates multiple (N>1) parallel output beamlets at one of the three primary colors (red, green, blue). The corresponding 1 to N output beamlets of the three linear arrays, each individually modulated in luminance according to a specific encoding scheme representing the video image to be produced on the viewing screen, are combined spatially to form a single white light linear array source. Through a projection/scanner optical system, the N output beamlets of the white light source are simultaneously directed to, and swept horizontally across a distant viewing screen, resulting in a swath of N lines of a graphic video image. By producing M contiguous swaths vertically down the viewing screen, a full image of M.times.N lines is produced.

Abstract: In a projection type image display device for combining an image by dichroic mirrors in a form of parallel plane plate, a projected image of high picture quality is presented by suppressing the astigmatism. In a projection type image display device comprising a light source for emitting blue light, green light, and red light, liquid crystal panels for modulating individual color lights, dichroic mirrors for combining the modulated lights, dichroic mirrors for combining the modulated lights, and a projection lens for projecting the combined light, the dichroic mirrors are disposed obliquely on a first plane including an optical axis linking the projection lens and liquid crystal panels, and a parallel plane plate for correcting astigmatism is disposed obliquely on a second plane orthogonal to the first plane.

Abstract: A full color projection system is disclosed herein. The projection system includes a means for generating a first light beam and also a means for generating a second light beam. These means may include either separate light sources 10a and 10b or a single light source 10 and a means for dividing the light source into the first and second light beams. In two examples, the means for dividing may include either a dichroic color wheel 40 or a color splitting prism 52. When a color splitting prism is used, they prisms are separated by an air gas where the distance of the air gap is determined by the size of spacer balls suspended in an adhesive between the two prisms. The first light beam will be modulated by a first spatial light modulator 30a and the second light beam will be modulated by a second spatial light modulator 30b. These spatial light modulators 30a and 30b are preferably, but not in necessarily digital micromirror devices.

Abstract: A light source for projecting rectangular color light bands includes a white-light source, a color separation device for separating the white light into red, green and blue components, and separate optics for forming images of rectangular red, green and blue light bands at predetermined positions. The light source is particularly useful in projection television apparatus having single panel light valves.

Abstract: Disclosed is a virtual display (300) which provides a wide field-of-view that is lightweight and may be as thin as ordinary eyeglasses. One version of the invention includes a display (302), such as an LCD, a microlens array (304), and an aperture array (306) disposed between the LCD and the microlens array. The virtual display provides a pin-point of light for each pixel (306) of a display (302). Each pin-point of light in collaboration with an associated microlens (308) generates a directed ray of light. The ensemble of these rays forms a coherent image on a viewer's retina. Using high "f" number microlenses permits a very short focal length between the pin-points and the microlenses and thus provides a very thin virtual display. The aperture array may be provided by a plate disposed between the display and the lens, or it may be apertures configured on the back side (away from the viewer) of the microlenses or on the front (towards the viewer) of the display.

Abstract: A dichroic mirror for reflecting red light for optical separating and a dichroic mirror for reflecting red light for optical synthesizing are installed on the same plane in an image generating apparatus of the present invention. In addition, a dichroic mirror for reflecting blue light for optical separating and a dichroic mirror for reflecting blue light for optical synthesizing are installed on the same plane. Accordingly, a compact configuration can be realized. Since a main reflecting mirror is a rotating elliptic mirror and a lamp is located on a focus or around the focus, a lighting equipment which irradiates conic luminous flux can be realized.

Abstract: In a video system for displaying a video picture composed of image points, whose color values and/or brightness values can be stored sequentially, according to a first set of parameters with predetermined parameter values containing number of lines, number of image points, line frequency and frame frequency as parameters, in an image storage which can be read out in accordance with a second set of parameters with different or identical parameter values for the parameters for displaying the stored video picture by means of a display device, the display device contains an individual light source which can be controlled in accordance with the color values and/or brightness values of the image points and whose light bundle can be projected onto a picture screen via an optical system, wherein the optical system has a raster scanning device by which the light bundle can be directed onto the picture screen on optional points within an image field for displaying the video picture of suitable dimensions and for which

Abstract: In order to improve an apparatus for generating an image in an image plane that is visible, in particular, for a human eye, comprising a radiation source which generates an image via an optical projection means by building up at least one row of image spots during an image build-up cycle by illuminating individual, adjacently located image spots and periodically repeating the image build-up cycle, so that it is possible to generate images as simply and, therefore, also as inexpensively as possible, it is suggested that a row of light sources comprising a plurality of semiconductor emitters be provided for the illumination of the image spots of the row of image spots, that the optical projection means associate each exit spot for the radiation of each semiconductor emitter with at least one of the image spots and that the optical projection means simultaneously image the exit spots of all the semiconductor emitters of the row of light sources onto the image spots associated therewith.

Abstract: An optical system is described consisting of reflection birefringent light valves, polarizing beam splitter, color image combining prisms, illumination system, projection lens, filters for color and contrast control, and screen placed in a configuration offering advantages for a high resolution color display. The system includes a quarter wave plate positioned to suppress stray reflection from the projection lens. The system also includes a second quarter wave plate disposed on the screen and a polarizing film disposed on the second quarter wave plate to suppress ambient light from illuminating the screen and entering the system.

Abstract: An optical system is described consisting of reflection birefringent light valves, polarizing beam splitter, color image combining prisms, illumination system, projection lens, filters for color and contrast control, and screen placed in a configuration offering advantages for a high resolution color display. In particular, the present invention includes a color splitting prism assembly having a plurality of output faces through which a separate color component is directed to be reflected by a respective light valve. Color absorbing filters are disposed at each of the output faces to absorb the color components not corresponding to the color directed through each output face.

Abstract: In a light valve projection type image display device, a lighting device suitable for a device making use of polarization in particular is presented. A lighting device transformed in the direction of polarization comprising a light source, an elliptical mirror, polarized light selecting means positioned at a second focal point position of the elliptical mirror, collimating for transforming the light from the second focal point of the elliptical mirror into nearly parallel light while reflecting, polarization transforming provided in the collimating, and optical path transforming having an aperture in the central part is provided. The light is separated into first and second directions of polarization by the polarized light selecting. The light in the second direction of polarization is enters the collimating and the direction of polarization is transformed in the same direction as the light of the first direction of polarization.

Abstract: An optical system is described consisting of reflection birefringent light valves, polarizing beam splitter, color image combining prisms, illumination system, projection lens, filters for color and contrast control, and screen placed in a configuration offering advantages for a high resolution color display. The illumination system includes a light tunnel having a cross-sectional shape corresponding to the geometrical shape of the spacial light modulator to optimize the amount of light projected onto the screen.

Abstract: Method and apparatus for a multi-application, laser-array-based image system utilizes three linear laser arrays. Each linear array generates multiple (N>1) parallel output beamlets at one of the three primary colors (red, green, blue). The corresponding 1 to N output beamlets of the three linear arrays, each individually modulated in luminance according to a specific encoding scheme representing the video image to be produced on the viewing screen, are combined spatially to form a single white light linear array source. Through a projection/scanner optical system, the N output beamlets of the white light source are simultaneously directed to, and swept horizontally across a distant viewing screen, resulting in a swath of N lines of a graphic video image. By producing M contiguous swaths vertically down the viewing screen, a full image of M.times.N lines is produced.

Abstract: A video projector including a light source and a light valve for receiving light emitted from the light source. A first filter is disposed between the light source and the light valve. The first filter removes light having a bandwidth ranging from ultraviolet to a wavelength within the visible spectrum of light and infrared light from the light emitted from the light source. A second filter is disposed between the first filter and the light valve. The second filter removes light having a bandwidth ranging from ultraviolet to a wavelength within the visible spectrum of light.

Abstract: An optical guide for horizontally aligning two vertically stacked images generated by one or two SLMs. The optical guide has a beam splitter that directs both images along two different paths. A first and a second aligning reflectors each disposed along each path for aligning the images. The beam splitter then redirects the images to the image plane 15. Along both paths, at least the aligning reflectors are optically powered so as to change the width or height of the images.

Abstract: A SLM-based projection display system (10) samples and processes video data for delivery to a spatial light modulator (SLM) (13c), and uses a color wheel (14a) to color the SLM-generated images. A frame memory (13b) provides data to the SLM (13c) and is managed so that, if the phase of the incoming video signal changes, a desired phase relationship between the color wheel position and the data available to the SLM (13c) can be maintained. Also, a motor control unit (15a) uses a horizontal sync signal to generate a drive signal for the color wheel motor (16a), which limits the transient time during phase-changing events, and which provides a means for adjusting the phase of the drive signal.

Abstract: A spatial light modulator system includes a multi-wavelength light source and three spatial light modulators, two dichroic mirrors are arranged in the light path between the light source and the spatial light modulators so as to direct light within a different wavelength band onto all but one of the spatial light modulators, light to the third spatial light modulator passing through the dichroic mirror onto the third spatial light modulator. Spatially modulated light reflected from the spatial light modulators is combined by the two dichroic mirrors to produce a multi-wavelength spatially modulated output beam. In order to equalize the number of reflections uundergone by spatially modulated light from all the spatial light modulators a reflector is provided in the optical path between the third spatial light modulator and the output beam.

Abstract: An optical system is described consisting of reflection birefringent light valves, polarizing beam splitter, color image combining prisms, illumination system having a light tunnel, projection lens, filters for color and contrast control, and screen placed in a configuration offering advantages for a high resolution color display.