WO2005084213A2 - Dispositif de recyclage d'eclairage et systeme d'affichage en couleurs comprenant ledit dispositif de recyclage - Google Patents

Dispositif de recyclage d'eclairage et systeme d'affichage en couleurs comprenant ledit dispositif de recyclage Download PDF

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Publication number
WO2005084213A2
WO2005084213A2 PCT/US2005/005965 US2005005965W WO2005084213A2 WO 2005084213 A2 WO2005084213 A2 WO 2005084213A2 US 2005005965 W US2005005965 W US 2005005965W WO 2005084213 A2 WO2005084213 A2 WO 2005084213A2
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WIPO (PCT)
Prior art keywords
light
optical element
recycler
element array
array
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PCT/US2005/005965
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English (en)
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WO2005084213A3 (fr
Inventor
Nayef M. Abu-Ageel
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Luxint, Inc.
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Publication date
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Publication of WO2005084213A2 publication Critical patent/WO2005084213A2/fr
Publication of WO2005084213A3 publication Critical patent/WO2005084213A3/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
    • G02B3/0068—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between arranged in a single integral body or plate, e.g. laminates or hybrid structures with other optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses

Definitions

  • the present invention relates generally to color projection systems utilizing one or more light modulators, and more particularly, to a color projection system that includes means for recycling light reflected from a color wheel.
  • BACKGROUND Single-modulator and two-modulator sequential color display systems have been used as a cost effective alternative to three-modulator full color display systems. Such systems are described in published European Patent Application EP1, 098,536 A2, to Duane Scott Dewald, which is hereby incorporated by reference. As shown in FIG.
  • the brightness of the single-modulator 10 and two-modulator 25 sequential color display systems is improved through the use of a recycling solid light pipe 5 (or recycling light tunnel) coupled with a dynamic filter 7 and 14, which provides one or more segments of each primary color filter to the light beam at all times.
  • the recycling pipe 5 consists of a light pipe 5b and a reflective plate 5a with an aperture 50a.
  • the exit aperture of the recycling pipe 5 typically has the same cross section aspect ratio as that of the modulator 9, 16 and 17 used by the display systems 10 and 25.
  • the input light 3 and 13a is focused into the entrance aperture of a recycling pipe 5 through an aperture 50a in a reflective plate 5a.
  • TIR total internal reflection
  • modulator 17 is always completely illuminated by one primary color (e.g., red), while the other two primary colors (e.g., blue and green) scroll across modulator 16.
  • the modulated light is focused by projection lens 19 onto a screen 20 to form an image.
  • Known single-modulator and two-modulator sequential color display systems suffer from low efficiency and lack of compactness. Therefore, there is a need for compact, light-weight, more efficient and cost-effective illumination systems to provide uniform light distribution over a certain area such as the active area of a modulator in sequential color display systems.
  • a novel aspect of the present invention is the use of one or more optical element arrays to form an illumination system which is capable of recycling light reflected by a -.uiur wheel, setting the numerical aperture of the light source beam, as well as providing the desired spatial distribution of light in terms of intensity and angle.
  • a light recycler includes of a light guide, a reflective plate with aperture and at least one optical element array.
  • the optical element array splits a light beam into a large number of sub-beams, which mix in a superimposing manner within the light guide, leading to a uniform light distribution across the exit aperture of the light guide.
  • the reflective plate of light recycler causes light reflected by the color wheel to be reflected back toward the color wheel (recycled), increasing the output brightness of the projector.
  • a recycler includes circulation, extraction and collimating optical element arrays. This recycler provides greater efficiency and compactness due to the use of highly compact and efficient array components.
  • a recycler includes a single optical element array, thus, providing an even more compact illumination.
  • FIG. 1A shows a cross-sectional view of a prior art single-modulator sequential full color projection system, which utilizes a recycler to provide uniform light distribution.
  • FIG. IB shows a cross-sectional view of a prior art two-modulator sequential full color projection system, which utilizes a recycler to provide uniform light distribution.
  • FIG. 1C shows a perspective view of a prior art recycler used in projection system of FIG. 1A.
  • FIG. ID shows a perspective view of a prior art light pipe or tunnel of FIG. 1 C.
  • FIG. IE shows a front plan view of a prior reflective aperture of FIG. lC.
  • FIG. 2 A shows a cross-sectional view of a single-modulator sequential full color projection system utilizing a compact recycler, in accordance with an exemplary embodiment of the present invention.
  • FIG. 2B shows a cross-sectional view of a two-modulator sequential full color projection system utilizing a compact recycler, in accordance with another exemplary embodiment of the present invention.
  • FIG. 2C shows a perspective view of a compact recycler used in the projection systems of FIG.
  • FIG. 2D shows a front plan view of an optical element array used at the entrance aperture of compact recycler of FIG.2C.
  • FIG. 2E shows a cross-sectional view of an optical element array of FIG. 2D.
  • FIG.2F shows a front plan view of another optical element array that can be used at the entrance aperture of compact recycler of FIG. 2C.
  • FIG. 2G shows cross-sectional view of an optical element array of FIG. 2F using non-collimating tapered optical elements.
  • FIG. 2H shows cross-sectional view of an optical element array of FIG. 2F using collimating tapered optical elements.
  • FIG.21 shows perspective view of a straight optical element.
  • FIG.2J shows perspective view of a tapered optical element.
  • FIG.2K shows perspective view of asymmetrical optical element.
  • FIG.2L shows a front plan view of a reflective plate with an optical element array bonded to its solid aperture.
  • FIG. 2M shows a cross-sectional view of a reflective plate of FIG. 2L.
  • FIG. 2N shows a front plan view of another reflective plate with an optical element array bonded to its hollow aperture.
  • FIG.2O shows a cross-sectional view of a reflective plate of FIG.2N.
  • FIG. 2P shows a front plan view of an optical element array used at the exit aperture of compact recycler of FIG.2C.
  • FIG.2Q shows a cross-sectional view of an optical element array of FIG. 2P.
  • FIG. 2R shows a cross-sectional view of two optical element arrays bonded together.
  • FIG. 2S shows a cross-sectional view of an optical element array of FIG. 2P with collimating optical elements on both sides of the array.
  • FIG. 3 A shows a front plan view of a solid optical element array that can be used at the entrance aperture of compact recycler of FIG.2C.
  • FIG. 3B shows a cross-sectional view of an optical element array of FIG.3 A.
  • FIG. 3C shows a cross-sectional view of an optical element array of FIG. 3 A with a flat reflective layer.
  • FIG. 3D shows a front plan view of a hollow optical element array that can be used at the entrance aperture of compact recycler of FIG. 2C.
  • FIG. 3E shows a cross-sectional view of an optical element array of FIG. 3D using shallow micro-tunnels.
  • FIG. 3F shows a cross-sectional view of an optical element array of FIG. 3D using deep micro- tunnels.
  • FIG.4A shows a front plan view of a circulation array.
  • FIG.4B shows a cross-sectional view of the circulation array of FIG.4A.
  • FIG. 4C shows a back plan view of an extraction array with circulation microelements on its back side.
  • FIG.4D shows a cross-sectional view of extraction array of FIG.4C.
  • FIG. 4E shows a front plan view of an extraction array with circulation micro- elements on its front side.
  • FIG.4F shows a cross-sectional view of extraction array of FIG.4E.
  • FIG.4G shows a front plan view of a collimation array using micro-prisms.
  • FIG.4H shows a cross-sectional view of collimation array of FIG.4G.
  • FIG. 41 shows a perspective view of a compact recycler with a collimation array, in accordance with another exemplary embodiment of the invention.
  • FIG.4J shows a cross-sectional view of compact recycler of FIG.41.
  • FIG. 4K shows a perspective view of a compact recycler without a collimation array, in accordance with another exemplary embodiment of the invention.
  • FIG. 4L shows a cross-sectional view of compact recycler of FIG.4K.
  • FIG. 5A shows a front plan view of a recycler consisting of a single array, in accordance with another exemplary embodiment of the present invention.
  • FIG. 5B shows a cross-sectional view of an exemplary structure of the recycler of FIG. 5A.
  • FIG. 6A shows a perspective view of a compact recycler in accordance with another exemplary embodiment of the present invention.
  • FIG. 6B shows a perspective view of a compact recycler with a light guide, in accordance with further exemplary embodiment of the present invention.
  • FIG. 6C shows a front plan view of the first array of FIGS. 6A-6B.
  • FIG. 6D shows a back plan view of the first array of FIGS. 6A-6B.
  • FIG.6E shows a cross-sectional view of the array of FIGS.6A-6B.
  • FIG. 6F shows a front plan view of the second array of FIGS. 6A-6B.
  • FIG. 6G shows a cross-sectional view of the array of FIG. 6F.
  • FIG.6H shows a cross-sectional view of a compact recycler of FIG. 6 A.
  • FIG. 61 shows a cross-sectional view of a compact recycler of FIG. 6B.
  • FIG. 2A shows a cross-sectional view of a single-modulator sequential color display system 38, which utilizes a compact light recycler 34, according to one embodiment of the present invention.
  • the projection system 38 includes light source 30 housed in an elliptical mirror 31, reflective aperture 33, recycler 34, color wheel 35, focusing lens 36 and display panel (i.e. modulator) 37.
  • FIG. 2B shows a cross-sectional view of a two-modulator sequential color display system 48, which utilizes a compact light recycler 34 according to another embodiment of the invention.
  • the projection system 48 includes light source 39 housed in an elliptical mirror 40, recycler 34, color wheel 41, TIR (total internal reflection) prism assembly 42, color splitting prism assembly 45, two modulators 43 and 44, projection lens 46 and screen 47.
  • the single-modulator and two-modulator sequential full color projection systems 38 and 48 of FIGS. 2A and 2B are more efficient in terms of light utilization and provide more compactness when compared to known single-modulator and two-modulator sequential full color projection systems 10 and 25 of FIGS. 1A-1B.
  • the higher efficiency and compactness are due to the use of recyclers 34 which are highly compact and more efficient.
  • recyclers' 34 higher efficiency enables the use of smaller modulators (modulator diagonal ⁇ 0.5") and smaller projection components such as the projection lens, which in turn leads to projection systems 38 and 48 that are more compact and less expensive.
  • recycler 34 There are many variations of the recycler 34 and some of them are described in the various embodiments of this disclosure. The disclosed embodiments are examples only, illustrating the principles of the invention. The claimed invention extends to and covers other possible embodiments that are not fully described herein.
  • FIGS. 2C shows a recycler 34 consisting of a solid light pipe (or hollow light tunnel with reflective sidewalls) 34b, a reflective plate 34a with an aperture 137 and an optional optical element array 34c.
  • the transmissive aperture 137 can be circular, rectangular, square, oval, hexagonal or any other shape.
  • reflective plate 34a is made as shown in FIGS. 2D-2E.
  • FIG. 2D shows a front plan view of reflective plate 34a where an optical element array 138 with a cross section dt x d 2 is formed on the surface of the entrance aperture 137.
  • FIG. 2E shows a cross-sectional view of reflective plate 34a along line A of FIG. 2D.
  • Neighboring optical elements 134 of optical element array 138 are separated by air or material 135 with lower index of refraction than that of the optical elements 134.
  • Micro- guides 134 can be straight 134, tapered 144 and asymmetrical 154 as shown in FIG. 21, FIG.2J and FIG. 2K, respectively, and their density can be up to several millions per cm 2 .
  • Design parameters of each optical element include size (C l5 C , C 3 , and C 4 ) and shape of cross-section, degree of taper, length, as well as angles ⁇ i, ⁇ 2 , ⁇ 3 , and ⁇ 4 .
  • Design parameters of an optical element array include distribution of optical elements 134 within an optical element array 138, which can be one dimensional, two dimensional, random, uniform or non-uniform.
  • optical elements other types of micro-elements such as micro-lenses and micro-prisms or combinations of different types can be fabricated within a single array.
  • a reflective layer 136 is bonded or deposited on the backside of reflective plate 34a except for the entrance aperture 137 as shown in FIG.2E.
  • FIGS. 2F-2H show another form of a reflective plate 34a.
  • FIG. 2F shows a front plan view of a reflective plate 340a
  • FIG. 2G shows a cross-sectional view of FIG. 2F along line B.
  • Two optical element arrays 339a and 339b are formed on the front and back sides of the entrance aperture of reflective plate 340a.
  • a reflective layer 336 is deposited on or bonded to one side of array 340a excluding arrays 339a and 339b.
  • Reflective plate 340a can be bonded to light pipe 34b so that array 339b faces the light pipe/tunnel 34b and array 339a faces the light source (FIG. 2G).
  • optical element arrays 339a and 339b deliver a light beam with an increased cone angle to light pipe/tunnel 34b thus enhancing the light mixing within the light pipe/tunnel and providing high light uniformity at a reduced pipe/tunnel 34b length.
  • FIGS. 2L-2O show an alternative approach to making reflective plate 34a.
  • FIG. 2L shows a front plan view of a reflective plate 50.
  • FIG. 2M shows a cross-sectional view of FIG. 2L along line C.
  • optical element array 58 is bonded to a solid aperture in the reflective layer 56 of plate 50 rather than being an integral part of plate 50.
  • optical element array 68 is bonded to a hollow aperture 64 in the reflective plate 60 rather than being an integral part of plate 60.
  • reflective layers 56 and 66 are applied to plates 50 and 60, respectively.
  • This approach permits independent fabrications of reflective plates 50 and 60 and optical element arrays 58 and 68, which in turn leads to making more optical element arrays 58 and 68 out of a certain plate or substrate, thus, lowering the cost of the optical element arrays 58 and 68 and recycler 34.
  • optional optical element array 34c is shown in
  • FIGS. 2P-2S show a front plan view of optical element array 34c and FIG. 2Q shows a cross-sectional view of FIG. 2P along line B.
  • Micro-guide array 34c may consist of tapered optical elements 234 arranged in a two-dimensional array 238 on one side of uic substrate as shown in FIG. 2Q.
  • the area 235 between adjacent optical elements 234 can be air or a material with an index of refraction lower than that of optical elements 234.
  • two (or more) identical optical element arrays 238 and 239 can be arranged in tandem to perform the function of optical element array 34c.
  • Micro-guide arrays 238 and 239 can be different in terms of their design and can be fabricated on both sides of a single substrate as shown in FIG. 2S.
  • optical element array 34c receives light from light pipe/tunnel 34b and delivers a more collimated light beam to the next stage.
  • the operation of recycler 34 is explained as follows. As shown in FIG. 2A, the input light 32a emitted from a light source 30 such as an arc lamp is focused into the entrance aperture 137 (FIG. 2C) of recycler 34 through an aperture in a reflective plate 33.
  • Micro-guide array 138 (FIG.
  • 2D which is located at the entrance aperture 137, receives the input light, splits input light beam into a large number of sub-beams with selected cone angles and delivers them to the light pipe/tunnel 34b.
  • a light beam with the required uniformity is delivered to the optional optical element array 34c, which in turn delivers a light beam with a lower cone angle when compared to the cone angle of light received from the light pipe/tunnel 34b.
  • optical element array 34c can be used to deliver light with a selected spatial distribution of cone angle to the next stage by controlling the design of the individual optical elements within optical element array 34c. It is possible to have a recycler 34 with a single optical element array 34a and light pipe/tunnel 34b (i.e.
  • the light beam 32b exits recycler 34 and impinges on the color wheel 35.
  • the color wheel 35 transmits part of the light 32b and reflects the rest of light beam 32b back to the recycler 34.
  • the reflected light travels toward the reflective plate 34a of the recycler 34 where part of it escapes toward lamp/reflector 30 and 31 through aperture 137 and the remainder gets reflected back toward the color wheel 35 by a reflective layer 136 and 336. Light escaping to the lamp/reflector 30 and 31 may have a chance of being refocused back into the entrance aperture 137.
  • the exit aperture of recycler 34 is preferably positioned very close to the color wheel 35 so that light reflected by the color wheel enters the exit aperture of recycler 34.
  • the operation of projection system 48 of FIG. 2B is described as follows.
  • the input light is focused into the entrance aperture of a recycler 34 through an aperture 137 in a reflective plate 34a (FIG. 2C).
  • the input light beam exits recycler 34 more uniform and homogeneous and impinges on the color wheel 41. Some of the light beam passes through each of the three or more color segments of the color wheel and the remainder is reflected back toward the recycler 34.
  • the recycler 34 of this disclosure (FIG. 2) has six key advantages over known light recyclers 5 (FIG. 1).
  • the recycler 34 of this disclosure can use a larger reflective plate 34a while maintaining the etendue of the lamp/reflector. This leads to increasing the efficiency of the recycler 34 and display systems 38 and 48 either by increasing the size of the aperture 137 while maintaining the ratio R (i.e. increasing collection efficiency from light source/reflector while maintaining the recycling efficiency of light reflected by the color wheel) or by maintaining the size of the aperture 137 while decreasing the ratio R (i.e. maintaining collection efficiency from light source/reflector while increasing the recycling efficiency of light reflected by the color wheel). Second, higher coupling efficiency between the light source and the light valve (i.e.
  • the recycler 34 of this disclosure provides higher level of light uniformity when compared to that of known recyclers 5 at an equivalent length. This high uniformity is due to the large number of additional virtual sources formed by optical element array 34a. Images of these virtual sources are superimposed on top of each other forming an extremely uniform light distribution at the exit aperture of the recycler 34.
  • the recycler 34 of this disclosure provides control over the spatial distribution of light in terms of its cone angle. This is done through the design of the individual optical elements of array 34c.
  • the recycler 34 of this disclosure provides a superior level of compactness and light-weight.
  • the length of the recycler 34 can be lower than the length of known recyclers 5 by up to three orders of magnitude resulting in very compact lightweight illumination systems.
  • the high coupling efficiency enables the use of small size display panels ( 0.5") which results in using smaller optical components such as the projection lens, thus, leading to very compact projection systems.
  • Sixth, lower cost is achieved by using the optical element arrays of this disclosure due to the reduced size of the optical components used within the projection system.
  • FIGS. 3A-3C show a more effective reflective plate 434a according to another embodiment of the invention.
  • FIG. 3 A shows a front plan view of reflective plate 434a, which has optical elements 434 arranged over the full surface of reflective plate 434a in a two dimensional optical element array 440.
  • FIG. 3B and 3C show cross-sectional views of FIG. 3 A along line C.
  • reflective layer 435 is deposited over the sidewalls of optical elements 434.
  • areas between sidewalls of optical elements 434 are filled with reflective layer 435.
  • a polishing step may be needed after the deposition of reflective layer 435 to obtain fillings with flat surface as shown in FIG. 3C. Since input light beam enters plate 434a from the left and initially through side 438, most of this light exits optical element array 440 with a higher cone angle, enters light pipe/tunnel and travels toward the color wheel (FIGS. 2A-2B). On the other hand, part of light traveling from right to left (i.e. light reflected by the color wheel) is reflected back toward the color wheel by reflective layer 435 and the remainder passes through the uncoated part of optical element array 440 toward the lamp/reflector (FIGS. 2A-2B).
  • FIGS, 3D-3F show a reflective plate 534a that is similar to reflective plate 434a of FIG. 3A-3C except for the use of micro-tunnels 534 rather than solid optical elements 434 to alter the cone angle of received light.
  • FIG. 3D shows a front plan view of reflective plate 534a and FIGS. 3E-3F show cross-sectional views of FIG. 3D along line D.
  • the depth d of micro-tunnels 534 of FIG. 3E is smaller than the substrate thickness t whereas micro- tunnels 534 of FIG. 3F have their depth extending across the substrate thickness t.
  • the reflective layer 535 coats the sidewalls of micro-tunnels 534 as well as the area between them. Reflective plates 434a and 534a of FIGS.
  • Reflective plates 434a and 534a allow the use of larger light sources, which are typically cheaper and provide more light flux. By using the whole surface of the reflective plate 434a and 534a as an input aperture rather than using a small portion of it, larger light sources can be used and more light can be collected even when using smaller light sources. In this case, most or all of light received by reflective plates 434a and 534a from the light source is delivered to the next stage (i.e., light pipe/tunnel 34b) with a higher cone angle and a small fraction of this light is reflected back toward the light source.
  • the next stage i.e., light pipe/tunnel 34b
  • a collimating optical element array 34c is usually used at the exit aperture of the light pipe/tunnel 34b.
  • reflective plates 34a, 340a, 50 and 60 light is focused into the entrance aperture 137 (FIG. 2C), which forms a small portion of the surface area of reflective plate 34a, 340a, 50 and 60, thus, collecting less light from the light source.
  • FIGS. 4A-4L show more compact and more efficient recyclers 1130 and 1160 when compared to the recycler 34 of FIG. 2C. Recyclers 1130 and 1160 perform the function of recycler 34 with the added advantage of being more compact.
  • FIG. 4A shows a plan view of a two-dimensional optical element array 1100, which consists of circulation micro-elements 1102 arranged in two dimensions (x and y).
  • FIG. 4B shows a cross-sectional view of optical element array 1100 along line C of FIG. 4A with an exploded three-dimensional view of micro-element 1102.
  • Each micro-element has four sidewalls 1103 as well as entrance 1104a and exit 1104b apertures.
  • Reflective layer 1101a is bonded to or deposited on the four sidewalls of array 1100 while sidewalls of circulation micro-elements 1102 are coated with a reflective layer 1101b.
  • FIG. 4C and 4E show plan views of two-dimensional optical element arrays 1120 and 1125, which consist of extraction micro-elements 1122 and 1127 arranged in two dimensions (x and y).
  • FIGS. 4D and 4F show cross-sectional views of optical element arrays 1120 and 1125 along line C of FIGS. 4C and 4E.
  • FIG. 4G shows a plan view of micro-prisms 1202 arranged in a two-dimensional micro-prism array 1200. Reflective layer 1201a is bonded to or deposited on the four sidewalls of array 1200.
  • FIG.4H shows a cross-sectional view of micro-prism array 1200 along line C of FIG. 4G with an exploded three-dimensional view of micro-eacht 1202.
  • each micro-prism 1202 has four sidewalls 1203 (two sidewalls are shown in the perspective view of the exploded micro-prism) as well as entrance 1203 and exit 1204 apertures.
  • Micro-elements 1102, 1122, 1127, and 1202 of arrays 1100, 1120, 1125 and 1200 can have any desired size and shape such as square, rectangular, circular, hexagonal and irregular.
  • FIGS. 41 and 4K show perspective views of two recyclers 1130 and 1160 according to two embodiments, respectively.
  • Recycler 1130 consists of circulation optical element array 1100, extraction optical element array 1120 and micro-prism array 1200, which are attached or bonded together as shown in FIGS. 4I-4J.
  • recycler 1160 consists of circulation optical element array 1100, plain glass plate 1150 with reflective layer on its four sidewalls and extraction optical element array 1125, which are attached or bonded together. The operation of recycler 1130 and 1160 is based on circulating the input light within the body of an optical element array 1120 or glass plate 1150 using circulating optical element array 1100.
  • the circulated light is uniformly extracted out of the body of the optical element 1120 or glass plate 1150 using extraction micro-elements 1122 and 1127.
  • the input light 1135 is focused onto the center of optical element array 1100 perpendicularly with a cone angle of ⁇ and impinges on the circulation micro-elements 1102 within the circulation array 1100 which increases the cone angle of preferably a substantial part of input light so that it is guided within the body of optical element array 1120 via total internal reflection (TIR) and reflection unless it is extracted by micro-elements 1122.
  • TIR total internal reflection
  • the function of circulation array 1100 is to deliver light to array 1120 with an angle ⁇ > ⁇ c .
  • Extraction micro-elements 1122 are distributed non-uniformly and may be randomly within extraction array 1120 so that their density is inversely proportional to the light density within the body of the optical element 1120.
  • FIGS. 4C and 4E show that the density of extraction micro-elements 1122 and 1127 increase from array 1120 and 1125 center toward its edges. As a result, the light delivered by extraction array 1120 and 1125 is highly uniform.
  • Light extracted by microelements 1122 enters the micro-prism array 1200 with an angle ⁇ in and exits with an angle ⁇ out , thus, a collimated and uniform light beam is delivered by recycler 1130.
  • light reflected back by the color wheel FIG.
  • recycler 1130 i.e. light travels in the -Z direction
  • the micro-prism array 1200 enters the micro-prism array 1200 and most of it gets refracted or reflected back toward the color wheel by the micro-prisms 1202 and/or reflective layer 1121b, respectively.
  • the remainder enters extraction optical elements 1122 toward the body of extraction array 1120 where it circulates until it gets extracted then directed toward the color wheel.
  • recycler 1160 of FIG. 4K-4L the input light is focused onto the center of optical element array 1100, which in turn increases the angle of this light and delivers it to the body of glass plate 1150.
  • the function of array 1100 is the same in both recyclers 1130 and 1160.
  • Extraction array 1125 is designed as described above to uniformly extract light from the glass plate 1150.
  • recycler 1160 light gets collimated within the tapered optical elements 1127.
  • recyclers 1130 and 1160 provide more efficient recycling of light (reflected by the color wheel) since eventually all the light reflected by the color wheel gets redirected toward the color wheel. This means 100% theoretical recycling efficiency in comparison to 60% theoretical recycling efficiency of known recyclers.
  • recyclers 1130 and 1160 provide control over the spatial distribution of light in terms of intensity and cone angle.
  • Design parameters of each micro-element 1102, 1122, 1127, and 1202 within an array 1100, 1120, 1125 and 1200 include shape and size of entrance and exit apertures, depth, sidewalls shape and taper, and orientation.
  • Micro-elements 1102, 1122, 1127, and 1202 within an array 1100, 1120, 1125 and 1200 can have uniform, non-uniform, random or non-random distributions and range from thousands to millions with each microelement 1102, 1122, 1127, and 1202 being distinct in its design parameters.
  • the size of the entrance/exit aperture of each circulation micro-element is preferably > 5 ⁇ m in case of visible light in order to avoid light diffraction phenomenon.
  • FIGS. 5A-5B show a recycler 1770 consisting of circulation 1777a and extraction 1778a and 1778b optical element arrays fabricated on a single optically transmissive substrate 1772.
  • FIGS. 5A-5B show a recycler 1770 consisting of circulation 1777a and extraction 1778a and 1778b optical element arrays fabricated on a single optically transmissive substrate 1772.
  • FIG. 5A and 5B show front plan view and cross-sectional view of a recycler 1770 of FIG. 5A along line B.
  • Circulation array 1777a and extraction array 1778a are fabricated on the back side of substrate 1772.
  • Extraction array 1778a consists of extraction micro-elements 1773a and 1773b which overlap with circulation micro-elements 1774b.
  • Extraction array 1778b consists of one dimensional prisms, which extend in the x-direction and are coated with a reflective layer 1774c and collimate light impinging on them so that it exits the array 1770 surface perpendicularly (i.e. substantially parallel to the Z-axis). Extraction micro-elements within array 1778b may have other shapes such as micro-prisms or micro-lenses that are distributed in a two dimensional array. Micro- elements within extraction arrays 1778a and 1778b are distributed over the surface of the substrate 1772 so that light is extracted uniformly from the body of the substrate 1772. It is possible to have a recycler 1770 with only one extraction array 1778a or 1778b rather than two arrays 1778a and 1778b.
  • the circulation array 1777a is shown to have one circulating micro-element 1771 as shown in FIG. 5A.
  • Number, size and shape of circulating micro-element 1771 are some of the design parameters of circulation array 1777a.
  • a reflective layer 1774a is bonded or deposited on the four edges of substrate 1772.
  • the operation of collimating 1777b, circulation 1777a and extraction 1778a and 1778b optical element arrays is no different from the operation of the already discussed collimating, circulation and extraction arrays.
  • recycler 1770 and recyclers 1130 and 1160 operate in a similar manner.
  • the advantage of recycler 1770 over recyclers 1130 and 1160 is its high compactness.
  • FIGS. 6A-6B show perspective views of two recyclers 1950 and 1970 according to two embodiments of the invention.
  • Recycler 1950 uses two optical element arrays 1910 and 1925 in its structure
  • recycler 1970 uses in addition to that a light pipe/tunnel 1935.
  • FIGS. 6C and 6D show a top and bottom views of optical element array 1910
  • FIG. 6E shows a cross-sectional view of FIGS. 6C-6D along line A.
  • a collimating optical element array 1900A is shown on the front surface of optical element array 1910, which correspond to the location of the hot spot of the input light beam.
  • extraction optical elements 1900b arranged in an array in the xy-plane. Distribution of these extraction optical elements 1900b can be uniform (FIG.
  • FIGS. 6D Exploded perspective views of collimating optical elements 1900a and extraction optical elements 1900b are shown in FIG. 6E.
  • FIGS. 6F and 6G show a perspective view and cross-sectional view of collimating optical element array 1925 along line C of FIG. 6F.
  • micro- prisms 1920 are distributed over the surface of array 1925 in areas that do not correspond to the input light (i.e. collimating array 1900A).
  • a perspective view of micro-prisms 1920 is shown in FIG. 6G.
  • Cross-sectional views of recyclers 1950 and 1970 are shown in FIGS.
  • recyclers 1950 and 1970 is based on collimating part of the input light that passes through the entrance apertures of the collimating optical elements 1900a of array 1900A.
  • the input light that passes through the sidewalls of optical elements 1900a is diverged (i.e. cone angle is increased) and gets spatially separated from the collimated light as it reaches the extraction optical elements 1900b.
  • rays Al and A2 represent the input light that goes through the entrance apertures of the collimating optical elements 1900a
  • rays Bl and B2 represent the input light that goes through their sidewalls as shown in FIG. 6H.
  • Light extracted i.e.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Projection Apparatus (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Polarising Elements (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

L'invention concerne un dispositif de recyclage d'éclairage (34) destiné à être utilisé dans des systèmes d'affichage (38, 48) de projection couleurs. Ledit dispositif de recyclage d'éclairage (34) redirige la lumière réfléchie par une roue colorée (35, 41) du système de projection (38, 48), ce qui permet d'améliorer la sortie d'éclairage du système de projection. Ledit dispositif de recyclage d'éclairage (34) est capable de mettre en place l'ouverture numérique souhaitée du faisceau source d'éclairage, ainsi que de fournir la distribution spatiale souhaitée d'éclairage, en ce qui concerne l'intensité et l'angle d'éclairage. Cela améliore l'uniformité lumineuse, la largeur de l'image affichée par le système de projection et également l'efficacité du système. Le dispositif de recyclage d'éclairage (34) comprend au moins un réseau d'éléments optiques sensiblement planaire recevant une lumière non uniforme à partir de la source lumineuse. Le réseau d'éléments optiques comprend un substrat transmissif de manière optique et une pluralité de microéléments optiques formés dans le substrat. Les microéléments agissent ensemble pour produire un faisceau lumineux de sortie présentant une surface de section transversale souhaitée et une distribution spatiale présentant une intensité lumineuse et un angle souhaités.
PCT/US2005/005965 2004-02-27 2005-02-25 Dispositif de recyclage d'eclairage et systeme d'affichage en couleurs comprenant ledit dispositif de recyclage WO2005084213A2 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US54829304P 2004-02-27 2004-02-27
US54881404P 2004-02-27 2004-02-27
US54861904P 2004-02-27 2004-02-27
US60/548,293 2004-02-27
US60/548,814 2004-02-27
US60/548,619 2004-02-27

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WO2005084213A2 true WO2005084213A2 (fr) 2005-09-15
WO2005084213A3 WO2005084213A3 (fr) 2008-08-21

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PCT/US2005/005965 WO2005084213A2 (fr) 2004-02-27 2005-02-25 Dispositif de recyclage d'eclairage et systeme d'affichage en couleurs comprenant ledit dispositif de recyclage
PCT/US2005/006303 WO2005084256A2 (fr) 2004-02-27 2005-02-25 Systeme de conversion de polarisation compacte pour affichages optiques
PCT/US2005/006248 WO2005084245A2 (fr) 2004-02-27 2005-02-25 Systeme de projection compact comprenant un reseau de guides de lumiere

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PCT/US2005/006303 WO2005084256A2 (fr) 2004-02-27 2005-02-25 Systeme de conversion de polarisation compacte pour affichages optiques
PCT/US2005/006248 WO2005084245A2 (fr) 2004-02-27 2005-02-25 Systeme de projection compact comprenant un reseau de guides de lumiere

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US8960924B2 (en) 2011-10-06 2015-02-24 Acer Incorporated Illumination system and projection apparatus

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KR102609838B1 (ko) * 2015-08-28 2023-12-06 에이엠에스-오스람 아시아 퍼시픽 피티이. 리미티드 광을 변환하기 위한 조명 모듈들
DE102019125264A1 (de) * 2019-09-19 2021-03-25 OSRAM CONTINENTAL GmbH Optische Vorrichtung und Fahrzeug
DE102021207955A1 (de) * 2021-07-23 2023-01-26 Osram Gmbh Optische Vorrichtung und Verfahren zur Herstellung derselben

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US8960924B2 (en) 2011-10-06 2015-02-24 Acer Incorporated Illumination system and projection apparatus
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CN103091955B (zh) * 2011-11-08 2017-09-01 宏碁股份有限公司 照明系统与投影装置

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WO2005084245A2 (fr) 2005-09-15
WO2005084256A3 (fr) 2006-12-14
WO2005084213A3 (fr) 2008-08-21
WO2005084245A3 (fr) 2007-02-08
WO2005084256A2 (fr) 2005-09-15

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