Abstract: A projector comprises an alternating-current-drive lamp, a rotating color wheel which includes color segments for transmitting color lights and is disposed in an optical path from the lamp, the color segments including a transparent segment, a projection unit configured to form an optical image by the color lights transmitted through the color wheel, and a light source control unit configured to raise a drive frequency of the lamp in a period in which the transparent segment of the color wheel is present in the optical path from the lamp.

Abstract: A projection device comprises a color wheel module, wherein, the color wheel can be detached from the color wheel module. The color wheel module can be detached from the body of the projection device, so that users can conveniently change, clean or maintain the color wheel as desired.

Abstract: A projection apparatus includes an illumination system, a projection module and at least a filter. The illumination system is for generating an illumination light beam. The projection module is for receiving the illumination light beam from the illumination system and projecting an image according to the illumination light beam. The filter is disposed in the illumination system and located on a light path defined by the illumination light beam. The filter comprises a first filtering part and a second filtering part. A minimum wavelength of a wavelength range of transmitted light of the second filtering part is larger than a minimum wavelength of a wavelength range of transmitted light of the first filtering part, or a maximum wavelength of a wavelength range of transmitted light of the second filtering part is smaller than a maximum wavelength of a wavelength range of transmitted light of the first filtering part.

Abstract: A color wheel has one or a plurality of color filter segments made from a first material, typically glass, having a coefficient of thermal expansion that is substantially different from a carrier, which is made from a second material, typically aluminum. An intermediate washer or coating is disposed in between the segment(s) and the carrier, and has a coefficient of thermal expansion either equal to the segment(s) or in between that of the segment(s) and the carrier. The segment(s) is/are adhered to the washer or coating via a rigid or strong adhesive capable to withstand the strong centrifugal forces associated with rotating the color wheel and the filter segments at high speed.

Abstract: According to one embodiment, a projection system includes a color wheel operable to filter light into a passed component and a reflected component. The projection system also includes a digital micromirror device comprising a plurality of micromirrors each operable to receive the passed component and the reflected component. Each micromirror is selectively positionable to direct, at approximately the same time, the passed component and the reflected component to desired locations. The projection system also includes an optical system operable to direct the passed component and the reflected component from the color wheel to the digital micromirror device at approximately the same time.

Abstract: In one aspect, the present invention relates to a stereoscopic projection system including a projection device with at least one filter which filters a parameter of the light in a color selective manner. The at least one filter which filters a parameter of the light in a color selective manner has a spectral characteristic for transmitting light in a first wavelength band or set of wavelength bands and for reflecting light in a second wavelength band or set of wavelength bands. The projection device includes a device, such as e.g. a rotating wheel or a sliding filter, for fast synchronized switching between light in different wavelength bands or sets of wavelength bands.

Abstract: An illumination system adapted to a projection apparatus is provided, including a light source module, a light color modulating module, and a control unit. The light color modulating module has a plurality of light color modulating units and is disposed in a transmission path of a light beam. The light color modulating module is capable of moving so that the light color modulating units move into the illumination region of the light beam. When the control unit determines that a boundary of any two adjacent light color modulating units has moved into the illumination region of the light beam, the control unit switches the light source module to an off-state. When the boundary of any two adjacent light color modulating units has moved away from the illumination region of the light beam, the control unit switches the light source module to an on-state. An illumination control method is also provided.

Abstract: A projector includes a light-source unit, a color wheel, and a connecting portion. The light-source unit with a first support structure is configured for providing light beams. The color wheel includes a color filter, a rotating portion, a motor and a second support structure. The color filter is rotatable together with the rotating portion driven by the motor, which is fixed on the second support structure. The connecting portion is configured for connecting the first and second support structures together and aligning the light-source unit with the color wheel.

Abstract: A display apparatus includes: a light modulation section having a plurality of translucent window sections; a light emitting section having a light source adapted to emit light; a light guide section having a tubular reflecting surface having a function of guiding the light from the light source to the light modulation section; and a light separation section provided to the light modulation section and disposed in a vicinity of the light source in parallel to or in substantially parallel to a lateral cross-sectional surface of the tubular reflecting surface, and having a light separation surface having a function of separating the light from the light guide section into transmitted light transmitted toward the light modulation section and reflected light reflected toward the light guide section, wherein the tubular reflecting surface narrows from the light modulation section toward the light emitting section so as to guide the reflected light to the translucent window sections, denoting a lateral cross-sectio

Abstract: A carrier, a locking member, a color filter unit and an elastic member are provided. The carrier includes a main body, a shaft and a lock-receiving portion. The shaft coaxially protrudes outwardly from the main body. The lock-receiving portion is defined in the shaft. The locking member is lockingly received in the lock-receiving portion. The color filter unit is disposed on the main body. The elastic member is interposed between the locking member and the color filter unit and is compressed therebetween to push the color filter unit against the main body. In this way, the color filter unit is firmly fixed on the main body and the color wheel assembly is assembled.

Abstract: An imaging device for projecting an image onto a projection area includes a radiation-emitting component which emits electromagnetic radiation along an emission direction during operation, an image-generating element in the beam path of the radiation-emitting component, a radiation-directing element in the beam path of the radiation-emitting component for directing the electromagnetic radiation onto the projection area, and a radiation exit area, wherein the projection area is offset laterally with respect to the radiation exit area.

Abstract: A brightness control apparatus applied to an illuminating system of a projector includes a plate and a slot portion. The slot portion is formed in the plate for a light beam of the illuminating system passing through. The slot portion has two opposite edges located at two sides of an arc locus. The center of the arc locus is a rotating center of the plate. The distance between the two edges of the slot portion is changed with the arc locus. The arc locus has a start point and an arbitrary point which are relative to the center of the arc locus, so as to form a central angle. The mathematics relationship between the distance of the two edges at the arbitrary point and the central angle is a polynomial function. The degree of the term with the highest degree is equal to or more than six.

Abstract: The invention relates to a projection system comprising: a polychromatic light source and at least one imaging assembly illuminated by an associated polychromatic illumination beam, and comprising: two separate colored wheels, respectively called first and second colored wheel; and three separate imagers, respectively called first, second and third imagers. At least one part of the polychromatic beam, called first source beam, illuminating the first colored wheel which separates said source beam into a first monochromatic beam and into a two-tone beam, said first monochromatic beam illuminating the first imager and said two-tone beam being transmitted toward the second colored wheel. The second colored wheel being illuminated by said two-tone beam and separating said two-tone beam into second and third monochromatic beams, respectively illuminating said second and third imagers respectively.

Abstract: The polarity of a voltage applied to the electrode pair is inverted by a changing signal generated at every boundary area of each filter color of the color wheel, and also in the blue color region (B) (a, b. c). Herewith, time during which the lamp electrode is positive and that negative is equal to each other every time the color wheel makes two rotations (T), thereby maintaining the heat load to be evenly distributed between both of the electrodes.

Abstract: Embodiments of the present invention are directed to a visual-collaborative system enabling geographically distributed groups to engage in face-to-face, interactive collaborative video conferences. In one aspect, a visual-collaborative system (400) comprises a display screen, a camera system, and a projector. The display screen (402) has a first surface (410) and a second surface (416), and the camera system is positioned to capture images of objects through the display screen. The projector (404,602,702) is positioned to project images onto the first surface that can be observed by viewing the second surface. The wavelengths of light used to produce the projected images are different from with the wavelengths of light used to capture images.

Abstract: A system for use in displaying modulated light includes a light source operable to generate a light beam. The system also includes a color wheel for receiving the light beam. The color wheel comprises a plurality of translucent segments. The plurality of translucent segments comprises a first number of blue segments, the first number of red segments, and a second number of green segments wherein the first number is greater than the second number and the second number is at least one.

Abstract: The disclosed embodiments relate to a system and method for compensating for spoke light in a video unit. More specifically, there is provided a method comprising measuring a first light level during a non-spoke time of a color wheel to generate a non-spoke light level; and setting a spoke light compensation value based on the measured non-spoke light level. There is also provided a video unit comprising a light source configured to generate a first light level during a non-spoke time of a color wheel, a photodiode assembly configured to measure the first light level to generate a non-spoke light level, and a processor configured to set a spoke light compensation value based on the non-spoke light level.

Abstract: A laser display device, which eliminates speckles generated in the transmission of laser beams and uniformly mixes laser beams of various colors, and an optical coupler therefor. The laser display device includes light sources emitting laser beams; an image display unit displaying an image by the laser beams; and a speckle elimination unit located on a path of the laser beams, and including at least one panel having an uneven part and disposed on an optical axis of the light sources.

Abstract: An illumination optical system for use in a microscope or electronic endoscope includes a solid-state lighting element that generates light having a spectral profile with peak intensities at multiple wavelengths such that the light output by said solid-state lighting element is perceived by an observer as being white in color, and a wavelength distribution conversion element having a spectral transmittance profile that includes specified wavelength regions within which the transmittance is nearly constant with increasing wavelength so as to form a step of nearly even intensity, and having specified wavelength regions within which the transmittance changes with increasing wavelength so as to form a transition region.

Abstract: A color wheel includes a fixing base, a ring filter, a washer, and a fixing ring. The fixing base has a protrusion portion and a supporting portion. The ring filter is fit on the protrusion portion. An inner margin of the ring filter leans on the supporting portion. The washer is connected to the protrusion portion. The ring filter is disposed between the washer and the supporting portion. The washer and the supporting portion clip the inner margin of the ring filter. The fixing ring has an annular supporting portion, a side wall surrounding the annular supporting portion, and fixing blocks connected to the side wall and dotted on an outer margin of the ring filter. The outer margin of the ring filter leans on the annular supporting portion. The fixing blocks, the side wall, and the annular supporting portion clip the outer margin of the ring filter.

Abstract: An image display apparatus includes an LD for emitting and modulating visible light, an optical scanning device for two-dimensionally scanning the light from the Ld on a screen in synchronism with the LD, an imaging device for picturizing an image of the image displayed on the screen, and an image processor for judging presence or absence of the pointing element such as a finger or fingers which is/are used to point out an optional position on the image based on temporal change of the image picturized by the imaging device. Even when the finger or fingers of a person is/are used as the pointing element, it is possible to judge the presence or absence of the pointing out of the image by the finger or fingers. Thereby, a number of components can be reduced.

Abstract: A drive, primarily for an optical light forming device, which light forming device can be used in a projector, which light forming device comprises an at least partly open area for light, where at least two light forming devices cooperate in a light path for forming the light, which light forming devices are rotated around a common axis in and out of the light path. To achieve opposite synchronous movement of light forming means, the light forming devices are rotated equal in opposite directions around the common axis by a common motor. Hereby, it can be achieved that the two light forming devices are rotated synchronously, but opposite in relation to each other. The opposite synchronous movement is very important if the light fainting devices are part of a modern computer controlled projector using step motors.

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 optical projecting system includes a light-splitting unit for splitting composite source light into a plurality of composite light beam components, and a reflective color wheel rotatable about a rotation axis and including a plurality of multi-layer light-reflecting sections for further splitting each of the composite light beam components into a plurality of colored light beam components for subsequent modulation and projection. Each of the multi-layer light-reflecting sections includes a plurality of light-filtering layers stacked along the rotation axis, and each being capable of reflecting light within a predefined distinct wavelength range, and permitting transmission of light outside the predefined distinct wavelength range therethrough. Sequences of the light-filtering layers of an adjacent pair of the multi-layer light-reflecting sections are different from each other.

Abstract: A display device includes the following elements. A display has a display area and includes an electro-optic layer and a light-reflecting layer reflecting light emitted from the electro-optic layer to the viewing side of the display device, the light-reflecting layer being arranged in the display area. A plate-shaped exterior has a frame area including a portion located outside the periphery of the display. An antireflective plate continuously covers both of the display area and the frame area. The antireflective plate prevents external light, which enters the viewing side of the display device and is reflected by the light-reflecting layer or the frame area, from emerging on the viewing side.

Abstract: A colorant molecule is provided that includes at least one switch unit. The switch unit comprises ring-based tautomers, of which there may be more than one per chromophore, and may include donor and/or acceptor moieties.

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 apparatus comprising a light source, an image display device and at least one filter device for transmitting a first portion of the radiation from the light source in a first wavelength range in the visible range to the image display device, and for diffusely reflecting a second portion of the radiation in a second wavelength range outside the visible range.

Abstract: A circuit arrangement (10) for operation of a high-pressure discharge lamp having a commutation device (K), which has an input (E1, E2) for coupling to a DC voltage source and has an output (A1, A2) for coupling to the high-pressure discharge lamp (EL). The commutation device (K) is configured to couple the voltage (UZW) which is applied to the input (E1, E2) to its output (A1, A2). A control apparatus (12) is configured to commutate the polarity with which the voltage (UZW), which is applied to the input (E1, E2) of the commutation device (K), is coupled to the output (A1, A2) of the commutation device (K). A synchronization apparatus (14) is configured to provide a synchronization signal (Sy) at its output (A1, A2). A timer apparatus (16) is configured to produce a commutation initiation signal (KA) at its output (A1, A2), which commutation initiation signal (KA) is synchronized with a predeterminable operating frequency of the high-pressure discharge lamp (EL).

Abstract: The disclosure is directed to image display apparatus and methods. In one example, an image display apparatus comprises a plurality of light source devices that supply color light components. A spatial light modulation device modulates the color light components from the light source devices according to an image signal. A control unit adjusts a display light emitted from the spatial light modulation device by controlling at least one of the light source devices or the spatial light modulation device. At the time of starting, the control unit adjusts the display light in accordance with an adjustment signal until an amount of light corresponding to at least one of the color light components reaches a predetermined reference value.

Abstract: A projection system comprising a first imaging component, at least a second imaging component, and a color combiner. The first and second imaging components each comprise an imager and a reflective polarizer that is configured to at least partially separate a light beam from the imager into a first portion and second portion, where the first portion and the second portion have substantially orthogonal polarization states. The first portions of the light beams are directed in the same direction above or below a plane defined by the second portions of the light beams. The color combiner is configured to combine the second portions of the light beams, where the second portions of the light beams have substantially orthogonal polarization states prior to entering the color combiner.

Abstract: A projector includes: a light modulation unit that modulates illumination light; a projection unit that projects image light modulated by the light modulation unit; and a holder that holds an optical filter and a cover in such a way that the optical filter and the cover can be alternately switched and positioned in an optical path on the light-exiting side of the projection unit.

Abstract: A color wheel (35) has equally arranged RGB primary color filters, and intermediate color filters each arranged between adjacent primary color filters. A time division driver (39) drives a spatial light modulator (31) by supplying color signals corresponding to color of the lights from the color wheel (35) to the spatial light modulator (31). The time division driver (39) controls the spatial light modulator (31) in accordance with display control instructed by a control unit (14). Since the intermediate color filters are arranged between the adjacent primary color filters, a projector engine (13) projects mixed color lights during color mixture terms where the primary color and the intermediate color are mixed, thus improves the color reproduction performance.

Abstract: A projection type video display apparatus having improved color separating ability is provided. The projection type video display apparatus includes a color separating unit including an entrance plate provided with an aperture through which light beams emitted by a light source travel, an optical integrator, and a plurality of dichroic mirrors disposed with their color separating surfaces extended substantially parallel to the exit surface of the optical integrator and capable of transmitting color light beams of wavelengths in a predetermined wavelength range and of reflecting color light beams of wavelengths outside the predetermined wavelength range.

Abstract: Pigment compositions each contain an organic pigment and at least one compound selected from compounds represented by the following formulas (I) or (II), respectively: A-N?N-D, B—N?N-D or C—N?N-D??Formula (I) A-N?N—CH(COCH3)—CONH-E, B—N?N—CH(COCH3)—CONH-E or C—N?N—CH(COCH3)—CONH-E??Formula (II) wherein A represents a substituted or unsubstituted phenyl group, B represents a substituted or unsubstituted ?-naphthyl group, C represents a substituted or unsubstituted ?-anthraquinonyl group, D represents a particular substituted aromatic group, and E represents a substituted or unsubstituted phenyl group, with a proviso that the compounds each have at least one substituent represented by —COOM or —SO3M in which M represents a hydrogen atom, metal atom, ammonium group, organic amine group or quaternary ammonium group. Colored compositions making use of the pigment compositions and color filters making use of the colored compositions are also disclosed.

Abstract: A method and apparatus for a projection display system includes a spatial light modulator and a volume illumination hologram. The spatial light modulator comprises a digital micromirror device, and the projection system includes a laser light source to produce a sequence of collimated, colored, light beams for the illumination hologram. Waste light produced by the spatial light modulator is transmitted to the illumination hologram, and the illumination hologram emits waste light from at least one of its edges. Waste light emitted from an edge of the illumination hologram is absorbed by a light sensor to control the intensity of the light beams. A projection focusing element is mounted proximate a side of the illumination hologram to focus the image beam from the spatial light modulator for viewing. A projection hologram is interposed between the side of the illumination hologram and the projection focusing element to manage waste light.

Abstract: A color wheel for use in a projector includes a motor having a rotor, a carrier fixed to the rotor, and a color filter attached to the carrier. The color filter includes a substrate, a plurality of first film groups and a second film group formed on the substrate. Each first film group includes a high refraction index film and a low refraction index film that are stacked. The second film group includes a trititanium pentoxide film and a low refraction index film. The second film group is formed in the color filter with a position selected from a plurality of predetermined positions using a thin film design software.

Abstract: Embodiments of the invention include a method, device and/or system for spoke recovery. A method for spoke recovery in a sequential multi-primary color display may include producing a primary color image component corresponding to a first primary color during a display period including at least a portion of a spoke period of the first primary color and a second primary color.

Abstract: Display systems that utilize digital micro-mirror device (DMD) technology are finding wide application in the areas of projection systems for color display. The common name for such systems is digital light processing projection systems or DLP projection systems. The systems and methods described herein utilize the non-imaging light to monitor and calibrate the projected image since the high levels of illumination and extreme temperatures of the imaging light require careful attention to the manner of light collection. Light collection is accomplished in a waste gate area by a light collector, e.g., an optical fiber mat, and the collected light is communicated to an associated sensor. The technique is non-invasive and may be applied to existing designs with minimal modification.

Abstract: A filter wheel having spirally shaped left and right channel 3D filters. The 3D filters are, for example, spectral separation filters. The filter is mounted, for example, close to an integrating rod output of a projector. The left and right channel filtered light scrolls across a modulation device which is energized with correspondingly scrolling left and right image data. In one embodiment, the integrating rod comprises mirrored surfaces to facilitate recycling of light reflected off the filter wheel. The filter wheel may be placed in a single or dual projector configuration. In one embodiment, the filters are fixed at the end of an integrating rod using “re-cycled” light to illuminate different channels of a projection system.

Abstract: A method and system for synchronizing rotating machinery or other electromechanical actuator devices to a series of sync pulses derived from a video stream comprising point optimized control laws.

Abstract: A color wheel includes a motor, a carrier, a number of color filter segments, a layer of adhesive, and an ultraviolet (UV) filter. The motor includes a rotor. The carrier is fixed to the rotor. The color filter segments are adhesively attached to the carrier. The ultraviolet filter is placed so that the adhesive is interposed between the UV filter and the carrier. The ultraviolet filter is substantially similar to the color filter segments in shape and size.

Abstract: A projection system includes a display apparatus comprising a plurality of tunable Fabry-Perot filters, each of the filters being configured for shifting between a state in which the filter transmits radiation in a bandwidth in the visible range of the electromagnetic spectrum and a state in which the filter transmits radiation in a bandwidth outside the visible range of the electromagnetic spectrum. An illuminator provides light to the plurality of Fabry-Perot filters. A control system receives image data and controls the display apparatus to project an image onto an associated display surface. The control system includes a modulator which provides wavelength modulation signals to the plurality of Fabry-Perot filters to modulate a color of pixels in the image and causes selected ones of the Fabry-Perot filters to shift into the bandwidth outside the visible range to modulate the brightness of pixels in the image.

Abstract: A controllable reflecting device having an array of mirrors that is combined with a tiled color filter such that each micro mirror reflects a single primary color is described. The tiled color filter, in the light path between a light source and the mirror array, images one micro mirror wide primary color stripes on the micro mirror array in a repeating sequence (for example RGBRGB etc.). A movable mirror or lens in the optics path between the micro mirror array and a projection screen is moved to displace the image formed by the micro mirror array and projected to the screen such that for each image all pixel positions at the screen sequentially see a micro mirror of each primary color.

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: An apparatus includes an electromagnetic radiation source, a reflector about the source having an aperture and a curved band pass filter at least partially across the aperture.

Abstract: A light fixture having at least one light source for generating a beam of light, a plurality of color filters are rotatable into position to intercept the light beam. The color filters are fixed to the color wheel by a central spring which has a number of radial protruding tongues for fixation of the color filters. The color filters are removable yet are secured in a correct position by radial protrusions formed between the color filters an circular outer protrusion located outward of the color filters so as to form a cavity that surrounds the color filter at both sides as well as at outward. Inward of the color filters, they are fixed by the protruding tongue that presses them down and keeps them in place. This leads to a nearly perfect fixation of each color filter, which can be exchanged if necessary.

Abstract: A projection lens unit and a thin projector using the same are disclosed. The projection lens unit includes a plurality of lens sets for emitting light carrying an image, and a reflector arranged between adjacent ones of the lens sets or at a downstream end of the lens sets, and adapted to change a direction of light incident on the reflector.

Abstract: A projection apparatus is described, which is provided with a lamp generating a light beam with a plurality of spectral elements. The projection apparatus comprises at least one band-cut filter and moving means which change the position of said band-cut filter dynamically relative to the optical path of the light beam within the projection apparatus. The invention also relates to a method for adjusting the colour components of a light beam.

Abstract: Systems and methods are described employing a first lens array and a second lens array that are separated by one focal length that receives a plurality of colors signals from an X-prism and transmits to a condenser for overlapping lenslet images onto a display panel, such as a LCOS or LCD display panel. The first lens array includes a plurality of lenslets where each lenslet in the first lens array corresponds with each lenslet in a plurality of lenslets in the second lens array. The lenslets can be either refractive, defractive, or a combination of refractive and defractive.