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WO2004097516A2 - Systeme optique de mecanisme d'eclairage monobloc - Google Patents

Systeme optique de mecanisme d'eclairage monobloc Download PDF

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Publication number
WO2004097516A2
WO2004097516A2 PCT/US2004/013103 US2004013103W WO2004097516A2 WO 2004097516 A2 WO2004097516 A2 WO 2004097516A2 US 2004013103 W US2004013103 W US 2004013103W WO 2004097516 A2 WO2004097516 A2 WO 2004097516A2
Authority
WO
WIPO (PCT)
Prior art keywords
light
optical system
solid state
imaging device
emitter
Prior art date
Application number
PCT/US2004/013103
Other languages
English (en)
Other versions
WO2004097516A8 (fr
WO2004097516A3 (fr
Inventor
Kevin J. Garcia
Mitchell C. Ruda
Tilman Stuhlinger
Original Assignee
Chromnomotion Imaging Applications, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US10/713,919 external-priority patent/US7152977B2/en
Application filed by Chromnomotion Imaging Applications, Inc. filed Critical Chromnomotion Imaging Applications, Inc.
Priority to CA002522616A priority Critical patent/CA2522616A1/fr
Priority to EP04760432A priority patent/EP1616219A4/fr
Priority to MXPA05011434A priority patent/MXPA05011434A/es
Priority to AU2004235047A priority patent/AU2004235047A1/en
Publication of WO2004097516A2 publication Critical patent/WO2004097516A2/fr
Publication of WO2004097516A3 publication Critical patent/WO2004097516A3/fr
Publication of WO2004097516A8 publication Critical patent/WO2004097516A8/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/10—Projectors with built-in or built-on screen
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources

Definitions

  • the present invention relates to. light and image projectors and particularly to illumination devices for projection displays.
  • the prior art discloses various light sources and image projectors for viewing videos and images.
  • the simplest light projector comprises a flashlight and a more complex device comprises an image projector with an incandescent light source such as in US Patent No. 6,227,669.
  • the present invention includes a solid-state light engine consisting of an illumination subsystem and a projection subsystem.
  • the illumination subsystem illuminates a single liquid crystal on silicon (LCOS) micro-display with light from red, green, and blue light emitting diodes (LEDs).
  • LCOS liquid crystal on silicon
  • LEDs red, green, and blue light emitting diodes
  • micro-displays that could be used with the present invention also include FLCOS, HTPS, Texas Instruments DLP, MEMS, and others.
  • the projection subsystem images the LCOS micro- display on to either a reflective or transmissive viewing screen for front or rear- view projection televisions (RPTV). Gray scale and color are created by temporally dithering the LCOS micro-display in conjunction with the LEDs.
  • Other micro-displays can be used to create gray scale in analog fashion as found in a typical LCD.
  • SXGA resolutions of at least 24-bit color, at least 1280x1024 resolution, and at least 60Hz frame rate are easily achievable with this system.
  • a projection based TV has been exemplified in the present specification, the present invention may be also be used for computer monitors and other display devices.
  • One exemplary implementation includes a doubly telecentric illumination system that diffuses light at the maximum beam spread of the cone of light from the source object points, thereby providing optimum local homogenization of the individual sources at the image.
  • the telecentric illumination system may include a planar array of telecentric light emitting diode (LED) sources telecentrically imaged to the micro-display by at least one Fresnel lens. Light from the individually colored LED channels may be combined through a dichroic cube structure while being imaged to the display.
  • the diffusion mechanism is placed just before the last Fresnel lens where the beam spread is the largest and where the lens serves as the final imaging component of the illumination system.
  • quad reflective, total internal reflection (TIR) differential, or edge ray concentrators collectively known as non- imaging concentrators, used in reverse and hence called emitters may be used to collect and subsequently emit light from solid state sources with large areas in the illumination subsystem.
  • the quad differential or edge ray concentrators may include four individually blended concentrators that are integrated side by side, centered on, and covering a quadrant of the solid state source.
  • the shape of the perimeter of the end nearest the solid state source may also be described as a "clover" configuration. This configuration enables an efficient collection and emission optic with a substantially smaller size than a single concentrator covering the entire solid state source.
  • a quad TIR compound hyperbolic emitter is used to collect and emit light from large LED die sizes and is composed of four individual TIR compound hyperbolic emitters blended side by side to cover the large LED die.
  • Each CHE is centered on and covers a quadrant of the LED die enabling an efficient collection and emission optic much shorter and smaller than a single concentrator.
  • the output from a non-circular die , or a group of dies may be more evenly captured and transmitted by orienting each dies corner at the overlap between each of the four CHEs forming the quad TIR CHE such as one having the clover configuration.
  • FIG. 1 illustrates the system layout of the optical system according to an exemplary embodiment of the present invention
  • FIG. 2 illustrates the principles of Optical System Telecentricity used in an exemplary embodiment of the present invention
  • FIG. 3 illustrates the light path propagation of the optical system of FIG. 1 using the principles of double telecentricity
  • FIGs. 4A and 4B illustrates the Red Compound Hyperbolic Emitter (CHE) used in an exemplary implementation of the present invention
  • FIG. 4C illustrates the placement of the end surface of a compound hyperbolic emitter to fit over the LED die for maximizing the collection and transmission efficiency
  • FIG. 4D illustrates the placement of the end surface of a single quad hyperbolic emitter to fit over an LED die for maximizing the collection and transmission efficiency
  • FIGs. 5A and 5B illustrates the Green/Blue Quad Compound Hyperbolic Emitter (CHE) used in an exemplary implementation of the present invention
  • FIG. 5C illustrates the placement of the end surface . of a quad compound hyperbolic emitter to fit over multiple LED dies for maximizing the collection and transmission efficiency;
  • FIG. 5D illustrates the orientation of multiple LED dies at the end surface of a quad compound hyperbolic emitter shown in FIG. 5C.
  • FIG. 6 illustrates a Dichroic structure comprising thin glass plates with dichroic material used in an exemplary implementation of the present invention
  • FIG. 7 illustrates the system layout of the optical system according to another exemplary implementation of the present invention.
  • FIG. 8 is an exemplary implementation of the electronics for controlling the LED light output
  • FIG. 9 is an exemplary structure of a rear projection television.
  • the optical system 10 of is a solid-state projector consisting of an illumination subsystem 32 and a projection subsystem 30.
  • the illumination subsystem 32 illuminates at least one micro-display 36 with light from a plurality of red 12, green 14, and blue 16 light emitting diodes (LEDs) arranged in separate color groups.
  • the projection subsystem 30 images the output from the LCOS micro-display 36 on to a reflective or possibly transmissive viewing screen for front or rear-view projection television (RPTV). Gray scale and color are created by temporally dithering the LCOS micro-display 36 in conjunction with the LEDs.
  • RPTV rear-view projection television
  • OLEDs organic light emitting diodes
  • solid state lasers lasers
  • other source of a light within a narrow bandwidth may be used in place of one or more of the LEDs.
  • the LEDs may be of any color or produce light at any wavelength and/or any band of wavelengths.
  • the illumination subsystem 32 is a critical or Abbe illumination system that images red, green, and blue (RGB) LED sources, 12, 14, and 16 respectively, to the LCOS micro-display 36 or potentially any other general type of spatial light valve, modulator, or digital light processor.
  • the critical illumination system attributed to Ernst Carl Abbe's use in microscopy, is an illumination system where the source is imaged directly onto the object.
  • the designed illumination system 32 in addition to being a critical illumination system, may be doubly telecentric. The double telecentricity is an important characteristic that optimizes, in particular, light processing by the LCOS micro-display 36 or other angular dependant micro-displays, while accommodating the telecentric configuration of the LEDs.
  • a telecentric optical system is one where the aperture stop 60 is located at a focal point of the optical system causing either the entrance pupil or the exit pupil to be located at infinity.
  • the aperture stop 60 is the physical stop that limits the amount of light or cone of light that propagates through the optical system.
  • the entrance pupil is the image of the aperture stop formed by all active optical elements preceding the aperture stop 60.
  • the exit pupil is the image of the aperture stop formed by all active optical elements following the aperture stop.
  • An optical system exhibiting object-space telecentricity has its aperture stop 60 located at the rear focal point of the optical system or lens 62.
  • the entrance pupil is therefore at infinity in the object space 64 (a space so called because it is where the object is normally located).
  • An incident chief ray 66 propagating from an object point 68 parallel to the optical axis will travel through the center of the aperture stop 60 to the image plane 65.
  • the chief ray 66 by definition, is the ray from an object point 68 that propagates through the center of the aperture stop 60 and hence the entrance and exit pupils since they are images of the aperture stop.
  • a chief ray 66 from another object point 70 will propagate in a substantially similar manner.
  • an optical system exhibiting image-space telecentricity has its aperture stop 80 located at the front focal point of the optical system or lens 82.
  • the exit pupil is therefore at infinity in a space where the image is normally located.
  • An incident chief ray 86 propagating from an object point 88 will travel through the center of the aperture stop 80 exiting parallel to the optical axis at the image plane 85.
  • a chief ray from another object point will propagate in a substantially similar manner.
  • a doubly telecentric system 90 combines the advantages of the object space telecentricity and image space telecentricity, and as illustrated in FIG. 2.
  • the micro-display 36 uses ferro-electric liquid crystal technology to switch the state of polarization of the incident light 37 in the plane of the cell.
  • the effectiveness of the micro-display's polarization retardation and associated state switching is a function of the path length of the light in the ferro-electric material.
  • the micro-display 36 operates best when light is normally incident on its active plane and all the rays of light travel nearly the same optical path length in the ferro-electric material. This is generally true of all liquid crystal based micro-displays.
  • the micro-display 36 (such as an LCOS micro-display) can accept up to a 25 degree off axis beam (f/1.2), it performs best and produces best contrast at f/3 or approximately a 10-degree maximum incident angle.
  • the f/number is an indication of the light gathering capabilities of an optical system. Optical systems with smaller f/numbers collect more light than large f/number systems.
  • the image space f/number is defined as the ratio of the effective focal length of the optical system divided by the entrance pupil diameter.
  • f-numbers very close to f/1 in order to maximize the amount of light illuminating the object..
  • the chief ray at the edge of the source in a non-telecentric system enters the micro-display 36 at a large angle and will be switched significantly differently than an on-axis ray from the center of the source.
  • An illumination subsystem 32 that provides image-space telecentricity at the LCOS micro-display 36 or any similar type of micro-display 36 forces the chief ray from each LED (12, 14, 16) to illuminate the micro-display 36 perpendicular to its plane.
  • the chief ray in this case is the ray of light from object points on each end of the sources that propagates through the center of the aperture stop.
  • LEDs (12, 14, 16), typically, are arranged on an electrical board with their emission axis perpendicular to the board.
  • a light emitting source is considered a telecentric source, thereby suggesting the use of a telecentric optical system for imaging purposes.
  • the optical system will have an object-space telecentricity.
  • an illumination subsystem that provides object-space telecentricity, at the LEDs forces the chief ray from each LED to emit parallel to the optical axis of the LED.
  • a ray emitting from the center of the LED parallel to the optical axis is forced to be the chief ray.
  • the present invention utilizes both object and image space telecentricities to accommodate the requirements of the micro- display and inherent LED layout on the electrical board.
  • FIG. 3 illustrates the doubly telecentric operation of the projector and the path propagation of the light rays emitted from the LEDs (12', 14, 16' .
  • the illumination system may include glass, plastic, aspheric, or Fresnel condenser lenses (20, 26, 28) to image the sources to the micro-display 36.
  • the current system uses, in an exemplary nature, three Fresnel lenses (20, 26, 28), whose Fresnel side is adjusted to minimize illumination system aberrations. Standard glass lenses, in addition or in lieu of Fresnel lenses, could also be used.
  • Fresnel lenses are easily aspherized to correct for spherical aberration, and are thin, lightweight, and less expensive than glass condenser lenses.
  • the illumination subsystem 32 includes a solid state source of red, green, and blue LEDs (12, 14, 16).
  • a solid state source of red, green, and blue LEDs (12, 14, 16).
  • an array of each color of red and green and blue LEDs are used as sources.
  • the LEDs are arranged in an array on the electrical board.
  • the arrays are composed of red and green and blue LEDs.
  • any LED having a selected waveband and output power may be used.
  • the red LED die may be enclosed with an appropriate encapsulent material within the hemispherical dome of the collection optic.
  • the green and blue LED die also could be enclosed with an appropriate encapsulent material within a similar hemispherical dome.
  • the green and blue LEDs could be four die arranged in a 2 x 2 die matrix. These LED may also have their die enclosed in an appropriate encapsulent material within a similar domical cavity. The encapsulent is necessary to provide an index matching material between the die emission surface and the collection optic with used in total internal reflection.
  • All of the LEDs in the array emit with a hemispherical Lambertian emission pattern.
  • a Lambertian emission pattern emits with equal brightness in all directions around the hemisphere while exhibiting a cosine fall off in intensity as a function of angle from the normal of the emission surface.
  • a fundamental problem of using such LEDs is capturing the available light from the LEDs and concentrating it into an area and emission angle that can efficiently and physically be imaged by the critical illumination system to the micro-display 36.
  • the hemispherical dome lenses are substantially large and limit the collection and ultimately the concentration of the light from the LEDs (12, 14, 16) on the micro-display 36.
  • the theoretical thermo-dynamic limit of light concentration called the conservation of brightness or throughput or etendue, is the product of the emission area of the source and its emission solid angle and is conserved as light propagates through the optical system. Small area sources with large emission solid angles cannot be forced, for example, into narrow emission solid angles with the same emission area.
  • compound hyperbolic concentrators can be used to optimize the collection efficiency of light off of the LEDs, which may be in the form of a planar surface.
  • Compound hyperbolic concentrators and their more common relative, compound parabolic concentrators (CPCs) were originally developed as solar concentrator technologies concentrating solar energy to a detector. When used in reverse (i.e., LED replacing the detector), they become highly efficient illuminators or emitters. As such they will be referred to hereafter as compound hyperbolic emitters (CHEs).
  • the CHEs in one implementation, are designed to achieve optimal total internal reflection (TIR), thereby maximizing the light collection efficiency from the LED die and subsequently maximizing the emission efficiency of the combined die and CHE system.
  • the CHEs fit over the actual LED die, but with the hemispherical lens removed from the original LED package.
  • the surface of the CHE is inherently designed to reflect light by total internal reflection.
  • the cavity at the bottom of the CHE was filled with an index- matched encapsulent, which coupled light from the die directly to the CHE.
  • the red, green, and blue CHEs were different from the green and blue CHEs. This was due to the difference in size of the die. Furthermore, some CHEs are truncated in length to limit their output apertures to accommodate magnifying their output to the micro-display. The non-truncated output aperture size is directly related to the input aperture size through the following equation.
  • a quad CHE has bilateral symmetry as shown in FIG. 5A-5D.
  • Such CHEs are generally a "quad" CHE composed of four separate CHEs. Additionally, some green and blue die are twice as large as the red die and in fact are made of four individual die.
  • the quad CHE can reduce the CHE output size while still maintaining reasonable emission efficiency.
  • the quad CHE consists of four individual CHEs, each CHE is centered on the corner "CC of each of the four dies 119a -119d LEDs to completely cover all the LEDs.
  • the surfaces of adjacent CHEs trim each other along planes centered on the quad CHE.
  • one end 110 of the quad CHE includes circular overlapping surface ends 116 from each of the individual CHE (CHE ⁇ , CHE 2 , CHE 3 and CHEOends 116a-116d.
  • This approach ensures complete coverage of the dies 119a-119d with the four by four arrays.
  • this design may be adapted to cover arbitrary number of solid state light sources of arbitrary shape, output power, and wavelengths.
  • the overlapping surfaces (or apertures) at the end 110 may be of arbitrary shape (e.g., square, triangular, etc.) and arbitrary size to ensure complete coverage of an arbitrary shaped dies having the LEDs.
  • a single CHE possibly with a clover configuration as shown in FIG. 5C and 5D, (or a triangular, square, circular, or any arbitrary polygonal shape) could be oriented with the die in a manner to maximize collection efficiency of the CHE and thus maximize emission efficiency of the combined die and CHE system.
  • the end 520 of the CHE may be oriented over the die to completely encompass the LED die 12 .
  • the end 522 of a single CHE with a quad or clover configuration is shown in FIG. 4D.
  • the corners "CC" of the die 12 are substantially oriented in the center of each lobe 522a -522d.
  • multiple CHE's may be combined to yield a configuration of end surfaces having an arbitrary configuration, instead of the clover configuration (e.g., pentagonal, hexagonal, etc.), and the periphery of the back end surfaces of the CHE's may be oriented about the corners/edges of the die to maximize collection efficiency of the CHE's and thus maximize emission efficiency of the combined die and CHE system.
  • An example of the clover configuration formed from the quad CHE is shown in FIG. 5C encompassing the dies comprising, for example, blue and green LEDs.
  • RGB red, green, and blue
  • LCD liquid crystal display
  • the color cube sometimes called an "X-cube"
  • X-cube is essentially a dichroic beamsplitter composed of four glass prisms coated with special coatings along the prism sides but not necessarily along the prism's hypotenuse. When the prisms are glued together their sides form the coated diagonals of the cube and hence the name X-cube.
  • An X-cube is typically located very close to the LCD and hence is required to be of a high optical quality.
  • major drawbacks of a color cubes include cost, size, and weight.
  • Dichroic filters are generally used to split light from a polychromatic (white) source, typically a discharge lamp, into component red, green, and blue (RGB) colors, and are typically located at the source side of the illumination system. The separate colors, after processing, are then recombined by the color cube.
  • RGB red, green, and blue
  • dichroic filters are their poorer optical quality as compared to color cubes and the fact that they split two colors and not three at a time.
  • a dichroic X (DX) structure as shown in FIGs. 1, 3, or as illustrated in detail in FIG. 6 is designed, in an exemplary aspect of the present invention, to recombine the RGB LED light outputs before it is processed by the micro-display 36.
  • the DX structure 21 is constructed by cutting either a red dichroic filter 19 or a blue dichroic filter 18, or gradient dichroic filters, in half. Gradient dichroic filters may be used instead of uniform dichroic filters to compensate for undesired color shifts caused by reflection and transmission variations as a function input beam angle of incidence on the dichroic filter. The end of each half is then secured to the middle of the other filter, forming another "X" but with thin, glass plate dichroic filters.
  • the dichroic filters are not required to be of high optical quality since they are located in the illumination end of the present system 10, and not in the image path.
  • the obscuration created by the joint between the halves is substantially small and, furthermore, is not in a conjugate plane to the micro-display 36. This and a homogenization component within the optical system mitigate any non- uniformity created by the seam 23.
  • a fold mirror 22 is included in one embodiment of the illumination system to fold the optical path to make a substantially compact system.
  • the front surface of the fold mirror 22 may be enhanced with an aluminum coating to minimize reflective loss.
  • a diffuser 34 is placed just before the third Fresnel condenser lens.
  • the diffuser homogenizes or makes uniform any non-uniformity from the RGB LED sources.
  • the particular diffuser used for example, in this design is a Light Shaping Diffuser (LSD).
  • LSD Light Shaping Diffuser
  • Plastic or ground glass diffusers could be used as well, the choice of diffuser is dependant on the use and other parameters of a system.
  • the diffuser's position in the optical system optimizes homogenization of the light reaching the micro-display 36. Placing the diffuser at the source ends near the CHEs, for example, which is a conjugate position of the critical illumination system, does not provide for the best light uniformity output. A position closest to the final optical element where the beam size (or beam spread) is at a maximum, on the object space side of the element, provides optimum homogenization ir. this particular design. Diffusing light from the individual LEDs at their maximum spread in the optical system provides optimum local homogenization of the light output from the LEDs at the micro-display 36. [0058] In another implementation, the fold mirrors may be eliminated, as shown in FIG. 7, to minimize optical losses by appropriately positioning the CHE-LED combination, the DX structure 21, the Fresnel lenses 26, 28, and the diffuser 34, in relation to the polarization beam splitter 24 and micro-display 36.
  • RGB LED sources Light from the RGB LED sources is non-polarized or natural polarized.
  • light incident on the LCOS micro-display must be linearly polarized.
  • the micro-display may be a reflective and not a transmissive device.
  • a polarization component 24 is (i) used to linearly polarize the light entering the micro-display and (ii) reflect the orthogonally polarized component from the micro-display onto the projection lens.
  • the system may be designed such that the LEDs emit polarized light.
  • the polarizing beam splitter may be replaced with a regular beam splitter.
  • the polarizing beam splitter 24 may be a wire grid (for e.g., the polarizing beam splitter 24 could be the beam splitter manufactured by Moxtek).
  • the polarizing beam splitter 24 serves simultaneously as polarizer as well as a beam splitter.
  • the wire grid type polarizer is thin, lightweight, relatively inexpensive, and does not introduce a significant, additional glass thickness into the illumination or the projection optical path.
  • wire grid polarizers generally accept smaller f/number beams (larger or wider acceptance angles), have high extinction ratios, and higher transmission and reflection of linearly polarized light than the typical polarization beam splitters.
  • polarizers could be used, such as a cube beam splitters with a polarization coating optimized for faster optical systems.
  • polarization coating optimized for faster optical systems.
  • wire grid or other type of polarizer to pre-polarize the light incident on a polarization beamsplitter.
  • the micro-display 36 in one aspect may be an SXGA color reflection mode Liquid Crystal Display (LCD) capable of displaying full color computer or video graphics with a substantially high spatial resolution .
  • the liquid crystal on silicon (LCOS) device uses a ferroelectric, as opposed to twisted neumatic, structure to switch the state of incident polarization very rapidly. Gray scale and color are achieved by temporally dithering the LCOS micro-display in conjunction with the LEDs.
  • Other types of micro-displays could be used in the current embodiment. For example, any single-chip technology such as Texas Instruments DLP may be used for at least one micro-display.
  • the microdisplay(s) could be either LCOS, FLCOS, HTPS, or MEMS based,
  • the light trap 32 is a light trapping box designed to suppress the orthogonally polarized non-signal light reflected from the polarizing beam splitter 24. This light, if not suppressed, will contribute to significant contrast reduction if it is reflected or scattered back into the signal beam path 39.
  • the light trap 32 is composed of an anti-reflection (AR) coated black- glass and a highly absorptive black wall.
  • the AR coated black glass is oriented at 45 degrees with respect to the incident light. Most of the light is transmitted visible light that enters the AR coated black glass and is highly absorbed as it propagates through the absorptive material. The small portion of remaining reflected visible light propagates to the highly absorptive black painted wall. Any back scattered light is scattered to the AR coated black-glass where the majority of this small amount of light further absorbed by the absorptive glass.
  • the trap cavity and associated aperture is designed to block a direct stray light path back to the microdisplay and the imaging path. Many orders of magnitude in stray light reduction are achievable with this arrangement. Additional folds can be added to further suppress any back-scattered component.
  • the projection lens 30 images the micro-display output on to the viewing screen.
  • the projection lens 30, in one aspect of an implementation could be a nine element in six group, f/1.75 lens, and is designed to project approximately 40-inch diagonal image at a distance of around 8 feet.
  • the projection lens may also contain a wire-grid linear polarizer at the aperture stop position.
  • the polarizer in the projection lens would be needed to improve the contrast ratio of the signal after refection from the wire-grid beamsplitter.
  • the contrast ratio off of this component is typically only about 20:1-50:1.
  • the linear polarizer in this particular design is placed at the stop because this space occupies a minimum area and the angles of incidence of the light are a minimum.
  • the linear polarizer may also be rotated independently of the lens barrel to accommodate contrast ratio changes as the lens is rotated to change focus.
  • the system employs a dynamic DC power amplifying circuit 200 that provides specific current to individual LED (solid state light sources) color channels at specific time intervals as shown in FIG. 8.
  • Inputs to the circuit are DC power 210 and a control signal 212 per LED color channel.
  • the circuit board 200 amplifies the DC power to preset current limits per LED color channel, and can be controlled either digitally or manually, and as active control signals are received the amplified DC power is supplied to the corresponding LED color channel resulting in LED light output for that specific channel.
  • the result is actual LED light output that can be controlled digitally, and timed LED light output that can be color sequential to a corresponding frame on a micro-display. This is done very differently from traditional lamp designs where AC power is being supplied to the lamp resulting in light that is outputed at a constant frequency.
  • FIG. 9 The general layout of a rear projection television, or other visual display, which includes one of the application areas, for the present invention is shown in FIG. 9.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un système optique utilisé dans des afficheurs à projection, qui comporte plusieurs sources lumineuses monoblocs associées à plusieurs émetteurs hyperboliques composites à base de réflexion, un dispositif à base de filtre dichroïque gradué destiné à homogénéiser la sortie lumineuse desdites sources lumineuses monoblocs, un dispositif à semi-conducteurs à cristaux liquides ferroélectriques destiné à l'éclairage avec sortie lumineuse à partir d'un réseau de sources lumineuses monoblocs, et un diffuseur de polarisation conçu pour l'homogénéisation de la lumière au niveau du dispositif à semi-conducteurs à cristaux liquides ferroélectriques, le diffuseur de polarisation étant placé en un point de l'espace, dans le système optique, et la dimension d'un faisceau lumineux émis à partir du dispositif à base de filtre dichroïque gradué étant sensiblement maximale.
PCT/US2004/013103 2003-04-24 2004-04-26 Systeme optique de mecanisme d'eclairage monobloc WO2004097516A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002522616A CA2522616A1 (fr) 2003-04-24 2004-04-26 Systeme optique de mecanisme d'eclairage monobloc
EP04760432A EP1616219A4 (fr) 2003-04-24 2004-04-26 Systeme optique de mecanisme d'eclairage monobloc
MXPA05011434A MXPA05011434A (es) 2003-04-24 2004-04-26 Sistema optico de motor de iluminacion en estado solido.
AU2004235047A AU2004235047A1 (en) 2003-04-24 2004-04-26 Solid state light engine optical system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US46573203P 2003-04-24 2003-04-24
US10/713,919 2003-04-24
US60/465,732 2003-04-24
US10/713,919 US7152977B2 (en) 2003-04-24 2003-04-24 Solid state light engine optical system

Publications (3)

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WO2004097516A2 true WO2004097516A2 (fr) 2004-11-11
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WO2017067915A1 (fr) * 2015-10-20 2017-04-27 Philips Lighting Holding B.V. Système optique, procédé et applications
EP3143449A4 (fr) * 2014-05-10 2018-01-03 Innovations in Optics, Inc. Lampe à diode électroluminescente de matrice de micromiroirs
US9971135B2 (en) 2014-05-10 2018-05-15 Innovations In Optics, Inc. Light emitting diode digital micromirror device illuminator

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US7819550B2 (en) 2003-10-31 2010-10-26 Phoseon Technology, Inc. Collection optics for led array with offset hemispherical or faceted surfaces
EP1846799A2 (fr) * 2005-02-09 2007-10-24 Inc. Wavien Combinaison a effacite en etendue de sources de lumiere multiples
EP1846799A4 (fr) * 2005-02-09 2011-01-26 Inc Wavien Combinaison a effacite en etendue de sources de lumiere multiples
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US8672500B2 (en) 2006-06-30 2014-03-18 Osram Opto Semiconductors Gmbh Optoelectronic component and illumination device
EP3143449A4 (fr) * 2014-05-10 2018-01-03 Innovations in Optics, Inc. Lampe à diode électroluminescente de matrice de micromiroirs
US9971135B2 (en) 2014-05-10 2018-05-15 Innovations In Optics, Inc. Light emitting diode digital micromirror device illuminator
EP3435132A3 (fr) * 2014-05-10 2019-04-17 Innovations in Optics, Inc. Lampe à diode électroluminescente de matrice de micromiroirs
US10409045B2 (en) 2014-05-10 2019-09-10 Innovations In Optics, Inc. Hollow light integrator for light emitting diode digital micromirror device illuminator
WO2017067915A1 (fr) * 2015-10-20 2017-04-27 Philips Lighting Holding B.V. Système optique, procédé et applications
US10323826B2 (en) 2015-10-20 2019-06-18 Signify Holding B.V. Optical system, method, and applications

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WO2004097516A8 (fr) 2006-08-31
CA2522616A1 (fr) 2004-11-11
EP1616219A4 (fr) 2006-08-09
AU2004235047A1 (en) 2004-11-11
EP1616219A2 (fr) 2006-01-18
WO2004097516A3 (fr) 2005-12-01
MXPA05011434A (es) 2006-05-31

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