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WO2025082571A1 - Dispositif de génération d'une image virtuelle avec une tige de mélange de lumière de réduction de granularité - Google Patents

Dispositif de génération d'une image virtuelle avec une tige de mélange de lumière de réduction de granularité Download PDF

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Publication number
WO2025082571A1
WO2025082571A1 PCT/DE2024/200072 DE2024200072W WO2025082571A1 WO 2025082571 A1 WO2025082571 A1 WO 2025082571A1 DE 2024200072 W DE2024200072 W DE 2024200072W WO 2025082571 A1 WO2025082571 A1 WO 2025082571A1
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WO
WIPO (PCT)
Prior art keywords
mixing rod
light mixing
light
speckle
rod
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/DE2024/200072
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German (de)
English (en)
Inventor
Willi SCHEFFLER-JUSCHTSCHENKO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aumovio Germany GmbH
Original Assignee
Continental Automotive Technologies GmbH
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
Application filed by Continental Automotive Technologies GmbH filed Critical Continental Automotive Technologies GmbH
Publication of WO2025082571A1 publication Critical patent/WO2025082571A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/32—Systems for obtaining speckle elimination

Definitions

  • the present invention relates to a device for generating a virtual image with a speckle-reducing light mixing rod.
  • a head-up display also known as a HUD, is a display system that allows the viewer to maintain their line of sight by projecting the content into their field of vision. While such systems were originally used primarily in aviation due to their complexity and cost, they are now also being installed in large-scale production in the automotive sector.
  • Head-up displays generally consist of an imaging unit or PGU (Picture Generating Unit), an optical unit, and a mirror unit.
  • the imaging unit generates the image using at least one display element.
  • the optical unit directs the image onto the mirror unit.
  • the mirror unit is a partially reflective, translucent pane. The viewer therefore sees the content displayed by the imaging unit as a virtual image and, at the same time, the real world behind the pane. In the automotive sector, the windshield is often used as the mirror unit, and its curved shape must be taken into account when displaying the image.
  • the interaction of the optical unit and the mirror unit ensures that the virtual image is an enlarged representation of the image generated by the imaging unit.
  • the viewer can only view the virtual image from the position of the so-called eyebox.
  • the eyebox is an area whose height and width correspond to a theoretical viewing window. As long as one eye of the viewer is within the eyebox, all elements of the virtual image are visible to the viewer. If, however, the eye is outside the eyebox, the virtual image is only partially visible to the viewer or not visible at all. The larger the eyebox, the less restricted the viewer is in choosing their seating position.
  • the optical unit typically comprises several mirrors to minimize the required installation space. The light emitted by the imaging unit is reflected by a folding mirror onto a curved mirror, which then reflects it toward the windshield.
  • curved mirrors are essentially flat plates with a large curvature according to the desired optical function. Such curved mirrors are manufactured using methods such as injection molding or injection-compression molding.
  • the imaging unit has a light source that, for color imaging, either has one or more light sources emitting white light, or multiple light sources emitting light of different colors. For example, laser light sources for red, blue, and green light are used.
  • a laser-based imaging unit generally requires sufficiently good mixing of the (collimated) laser light in the illumination system.
  • light mixing rods can be used, among other things, which can be either hollow or filled. If a scatterer with a targeted scattering function is placed in front of the rod, the angular range at the exit can be controlled. If the light mixing rod is sufficiently long (for a sufficient number of reflections), a very homogeneous field is obtained at the exit surface, which is then imaged or transferred onto the imager, for example, a DMD (Digital Micromirror Device) or an LCOS (Liquid Crystal On Silicon). This makes it possible to create sharp-edged and efficient illumination.
  • DMD Digital Micromirror Device
  • LCOS Liquid Crystal On Silicon
  • DE 10 2022 205 445 A1 describes a device for generating a virtual image, comprising an imaging unit for generating an image.
  • the imaging unit comprises multiple laser light sources emitting coherent light of different colors and a speckle-reducing element, the functionality of which is not specified therein.
  • US 9,335,604 B2 describes a device for generating a virtual image in which an active speckle-reducing element is used. Furthermore, an optical fiber that preserves image information is used, but this is not suitable for reducing speckle effects.
  • a device for generating a virtual image which comprises an imaging unit for generating an image, a light source that emits coherent light, and a speckle-reducing element, is characterized according to the invention in that the speckle-reducing element is a speckle-reducing light mixing rod.
  • the speckle-reducing element is a speckle-reducing light mixing rod.
  • the imaging unit is illuminated with speckle-reduced light by the light mixing rod.
  • a first diffuser is arranged on the input surface of the light mixing rod, with a further speckle-reducing element being arranged in the light mixing rod.
  • This has the advantage that the light entering the light mixing rod already exhibits a certain degree of scattering, so that the entire length of the light mixing rod can be used to reduce coherence and thus to reduce speckle effects.
  • several speckle-reducing measures are integrated into the light mixing rod, which are also based on different effects such as scattering, partial reflection, or others.
  • the additional speckle-reducing element is an additional diffuser.
  • Diffusers are proven components available on an industrial scale.
  • a hollow light mixing rod one or more additional diffusers are placed in its hollow space.
  • a solid light mixing rod it is composed of two or more solid sub-rods, between each of which one of the additional diffusers is arranged.
  • the input and/or output surface of a light mixing rod or sub-rod has a rough surface.
  • the diffuser function is implemented directly on the light mixing rod or sub-rod. The arrangement and assembly of a separate component, in this case a diffuser, is unnecessary in this case.
  • the light mixing rod has at least one beam splitter.
  • the one or more beam splitters generate light paths of different lengths, resulting in uncorrelated speckle patterns that overlap and thus reduce the speckle effect noticeable to the observer or even completely eliminate it, thus bringing it below the observer's perceptibility threshold.
  • a combination of beam splitter and diffuser is also within the scope of the invention.
  • the light mixing rod is a hollow rod whose inner surface is provided with a beam splitter coating.
  • a coating can be produced without great effort.
  • the outer surface of the light mixing rod is advantageously provided with a coating that reflects inward, into the light mixing rod.
  • the transmission factor of the beam splitter coating is equal to or greater than its reflection factor. It has been found that in this case, coherence and thus the speckle effect are particularly effectively reduced.
  • Advantageous ratios of reflection factor to transmission factor are 50:50, 40:60, or 30:70.
  • the wall of the light mixing rod designed as a hollow rod, has a non-uniform thickness.
  • the wall thickness continuously increases and decreases around the circumference of the hollow rod.
  • a shape is relatively easy to manufacture, for example, by placing a hollow glass rod horizontally while the glass cools. Gravitational forces cause the glass to flow slightly, resulting in a greater thickness in the lower than in the upper region.
  • a thickness that varies in steps around the circumference is advantageous. This shape, which approximates a discontinuity, also leads to a reduction in coherence and speckle. It can be produced, for example, by joining prefabricated glass tube halves of different thicknesses and fusing them together. A steep step then appears at the connecting line.
  • a wall thickness that varies continuously or in steps along the length of the hollow rod is also advantageous.
  • the manufacturing process and advantages are similar to those of a wall thickness that varies along the circumference.
  • the length of the light mixing rod and the scattering angle of the at least one diffuser are coordinated. This has the following advantage, among others: By clever adjustment, the Improve the reduction of speckle effects without requiring complex additional measures. It has been found to be advantageous if a diffuser arranged on the input surface has a scattering angle of the order of 20°, while diffusers arranged inside a light mixing rod have a smaller scattering angle in the range of 5° to 10° and are spaced 30mm apart for a light mixing rod cross-sectional area of approximately 100mm2 .
  • a head-up display according to the invention has a device according to the invention for generating a virtual image.
  • Fig. 1 shows schematically a head-up display according to the prior art for a motor vehicle
  • Fig. 2 shows schematically part of an imaging unit
  • Fig. 3 shows schematically another embodiment of an imaging unit
  • Fig. 4 shows an imaging unit according to the invention
  • Fig. 5 shows another imaging unit according to the invention
  • Fig. 6 shows another imaging unit according to the invention
  • Fig. 7 shows a light mixing rod in a sectional view
  • Fig. 8 shows another light mixing rod in a sectional view
  • Fig. 9 shows a light mixing rod in longitudinal section
  • Fig. 10 shows another light mixing rod in longitudinal section
  • Fig. 11 shows another light mixing rod in longitudinal section
  • Fig. 12 another light mixing rod in cross section
  • Fig. 13 shows a light mixing rod in perspective view.
  • Fig. 1 shows a schematic diagram of a head-up display according to the prior art for a motor vehicle.
  • the head-up display has an imaging unit 1, an optical unit 2, and a mirror unit 3.
  • a beam SB1 emanates from a display element 11, which is reflected by a folding mirror 21 onto a curved mirror 22, which reflects it toward the mirror unit 3.
  • the mirror unit 3 is designed here as a windshield 31. of a motor vehicle. From there, the beam SB2 travels towards an eye 61 of an observer.
  • the viewer sees a virtual image VB, which is located outside the motor vehicle above the hood or even in front of the motor vehicle. Due to the interaction of optical unit 2 and mirror unit 3, the virtual image VB is an enlarged representation of the image displayed by display element 11. A speed limit, the current vehicle speed, and navigation instructions are symbolically displayed here. As long as the eye 61 is located within the eyebox 62 indicated by a rectangle, all elements of the virtual image are visible to the eye 61. If the eye 61 is located outside the eyebox 62, the virtual image VB is only partially visible to the viewer or not visible at all. The larger the eyebox 62, the less restricted the viewer is in choosing their seating position.
  • the curvature of the curved mirror 22 serves, on the one hand, to prepare the beam path and thus ensure a larger image and a larger eyebox 62.
  • the curvature compensates for a curvature of the windshield 31, so that the virtual image VB corresponds to an enlarged reproduction of the image displayed by the display element 11.
  • the curved mirror 22 is rotatably mounted by means of a bearing 221. The resulting rotation of the curved mirror 22 enables the eyebox 62 to be moved and thus the position of the eyebox 62 to be adjusted to the position of the eye 61.
  • the folding mirror 21 ensures that the path traveled by the beam SB1 between the display element 11 and the curved mirror 22 is long, while at the same time the optical unit 2 remains compact.
  • the optical unit 2 is separated from the surroundings by a transparent cover 23.
  • the optical elements of the optical unit 2 are thus protected, for example, against dust in the interior of the vehicle.
  • an optical film 24 or a coating is located on the cover 23, which is intended to prevent incident sunlight SL from reaching the display element 11 via the mirrors 21, 22. This could otherwise be temporarily or permanently damaged by the resulting heat development.
  • an infrared component of the sunlight SL is filtered out by means of the optical film 24.
  • a glare shield 25 serves to shade light incident from the front so that it is not reflected by the cover 23 toward the windshield 31, which could dazzle the viewer.
  • the light from another stray light source 64 can also reach the display element 11.
  • Fig. 2 shows a schematic view of part of an imaging unit 1 for a head-up display.
  • Laser diodes LD1-LD3 are provided for three complementary colors. The light emitted by them is guided by means of an optical fiber WG1-WG3 to a display element TFT1, TFT2, TFT3 provided for the respective color component.
  • all laser diodes LD1-LD3 for three complementary colors are arranged below the dichroic prism DP.
  • the laser diodes LD1-LD3 are stacked one on top of the other to save space.
  • the optical fibers WG1-WG3 therefore have different lengths.
  • Light processing is based on fiber optic technology, also known as waveguide technology. This means that coupling, homogenization, and illumination are performed using fiber optic cables (WG1 to WG3) separately for each color, potentially eliminating the need for switchable gratings. This eliminates the need for numerous components in the light guide.
  • Fig. 3 schematically shows another embodiment of an imaging unit 1 with light sources 14R, 14G, 14B, which emit coherent light.
  • a controllable mirror unit 73 can be seen in the imaging unit 1, which acts as a display element 11.
  • the mirror unit 73 consists, for example, of a two-dimensional arrangement of micromirrors, which, when controlled, can each be moved into one of two positions. A light beam striking it is thus modulated in a pixel grid to generate the virtual image.
  • the controllable mirror unit 73 consists of a mirror adjustable about several axes, which is controlled such that a laser beam incident on it is reflected according to a two-dimensional grid, thus generating the virtual image VB.
  • the light sources 14R, 14G, 14B are indicated here as schematic boxes. They can be designed as conventional light sources, for example, as light-emitting diodes (LEDs), or as laser light sources.
  • LEDs light-emitting diodes
  • the solution according to the invention is particularly useful when the light sources 14R, 14G, 14B emit coherent light, in which speckles can occur, which can be reduced by the measures according to the invention.
  • Fig. 4 shows an imaging unit 1 according to the invention.
  • the light sources 14R, 14G, 14B are designed as laser diodes.
  • the light emitted by them is collimated, indicated here by lenses 151.
  • a mirror 161 or two dichroics 162, 163 the light emitted by the three light sources is combined in a common propagation direction. It reaches a light mixing rod 17, through which it passes.
  • Diffusers 171, 172, 173 are arranged in or on the light mixing rod 17. After leaving the light mixing rod 17, the light passes through a lens 155 and is deflected by a mirror 166 towards the mirror unit 73. It first passes through another lens 156 and an RTIR prism 18.
  • RTIR prism 18 This directs the light onto the mirror unit 73 at an angle suitable for the mirror unit 73, so that when the micromirror of the mirror unit 73 is in the "ON" position, light enters the RTIR prism 18 at such an angle that it is reflected by it as shown in the figure and directed - to the right in the figure - towards the optical unit 2. Light that strikes micromirrors in the "OFF" position is reflected in such a way that it does not re-enter the RTIR prism 18. In particular, it is absorbed by a beam trap not shown here.
  • the term RTIR prism stands for "Reverse Total Internal Reflection" prism. This is a component commonly used in DMD projectors.
  • a laser-based imaging unit 1 generally requires sufficiently good mixing of the (collimated) laser light in the illumination system.
  • a light mixing rod 17 can be used, among other things.
  • Light mixing rods can be hollow or filled/solid. If a scatterer, here the diffuser 171, with a targeted scattering function is placed in front of it, additional light paths LW1 are created. By appropriately selecting the scattering properties of the diffuser 171, the angular range at the exit of the light mixing rod 17 can be controlled.
  • the scattering properties of the diffuser 171 include its scattering angle cd, which is shown here between the two outermost light paths LW1 created by it.
  • the light mixing rod 17 has a sufficient length L (for a sufficient number of reflections), a very homogeneous field is obtained at the exit surface of the light mixing rod 17, which is subsequently imaged or transferred onto the imager (e.g., a mirror unit 73 configured as a DMD or an LCOS). This enables sharp-edged and efficient illumination to be generated.
  • the imager e.g., a mirror unit 73 configured as a DMD or an LCOS.
  • additional diffusers 172, 173 are incorporated into the light mixing rod 17 as scatterers. Their scattering angles a2, a3 are also indicated here between their respective outermost light paths LW2, LW3.
  • the diffusers 172, 173 ensure that additional light paths LW2, LW3 are generated, depending on the so-called scattering pattern. These are uncorrelated to one another and add up, which ultimately leads to a reduction in the speckle contrast. The more diffusers 171-173 are used, the lower the speckle contrast becomes.
  • the diffusers 172, 173 are arranged evenly distributed over its length L. If the light mixing rod 17 is designed as a solid rod, this composed of partial rods 1701, 1702, 1703, whose lengths L1, L2, L3 are equal in the illustrated embodiment. A diffuser 172, 173 is arranged between each of the partial rods 1701, 1702, 1703.
  • speckle-reducing element is a passive component.
  • active speckle-reducing elements require a movable component or an actively controlled switching of a variable element between at least two states. This requires installation space, may lead to unwanted vibrations, and consumes energy.
  • Fig. 5 shows an imaging unit 1 according to the invention. It differs from the embodiment shown in the previous figure in the design of the light mixing rod 17.
  • a single diffuser 171 is provided.
  • the light mixing rod 17 is hollow inside and has a glass layer 174 of a first thickness D1 on its upper wall and a glass layer 175 of a second thickness D2 on its lower wall.
  • the first thickness D1 is smaller than the second thickness D2.
  • the glass layers 174, 175 are provided with a beam splitter coating 176 on their surface facing the inner cavity of the light mixing rod 17, the inner surface 170.
  • Rays coming from the diffuser 171 are thus partly reflected by the inner surface of the glass layer 174, 175 and partly pass through it. This creates additional light paths.
  • Rays that reach the outer surfaces of the glass layer 174, 175 from the inside are reflected by a reflective coating 177 arranged there.
  • the reflective coating 177 has a reflection rate of R > 90%.
  • Each ray that reaches the beam splitter coating 176 is again partly reflected and partly transmitted there, so that additional light paths are created.
  • the beam splitter coating 176 is preferably used on the first boundary layer. Additional light paths are also generated without such a coating. Using the beam splitter coating 176, a suitable ratio of reflection rate R to transmission rate T is specified, which is adapted to the respective boundary conditions. To enhance the effect, glass layers of different thicknesses D1, D2 are used.
  • the light mixing rod 17 can be either hollow or filled.
  • the filling material can be either a material with the same refractive index as the shell of the light mixing rod 17 or a material with a different refractive index. Glass is preferably used as the material for both the wall and the filling.
  • the design with the same refractive index has the advantage that reflection and transmission properties, in particular the R/T ratio, are defined exclusively by the beam splitter coating 176. With a constant material combination, different speckle reduction behaviors can still be adjusted.
  • the design with different refractive indices has the advantage that a beam splitter coating 176 can be dispensed with entirely if the boundary layer already has the desired reflection and transmission properties. It can also be advantageous if a beam splitter coating 176 is used, but only for fine adjustment of the reflection and transmission properties.
  • Fig. 6 shows an embodiment of the invention in which the features of the two previously described embodiments are combined. This combination exhibits the greatest reduction in speckle contrast, as it combines the increased number of different light paths of both embodiments.
  • the length L of the light mixing rod, or the lengths L1, L2, L3 of the partial rods 1701, 1702, 1703, and the The scattering angles a1, a2, and a3 used play a significant role. To achieve a sufficiently good effect, both parameters are coordinated.
  • Fig. 7 shows a sectional view of a light mixing rod 17.
  • the light mixing rod 17 is a hollow rod. Its inner surface 170 is provided with a beam splitter coating 176. It can be seen that the wall 1704 of the light mixing rod has a continuously changing thickness D, which assumes a minimum value of thickness D1 in the lower part of the figure and a maximum value of thickness D2 in the upper part of the figure.
  • Fig. 8 shows a further light mixing rod 17 in a sectional view.
  • the light mixing rod 17 is composed here of an upper half 1705 and a lower half 1706.
  • the upper half 1705 has a thickness D2 which is greater than the thickness D1 of the lower half 1706.
  • the two halves 1705, 1706 each have a substantially constant thickness D2, D1. Only in the transition region between the two halves 1705, 1706 does the thickness change, transitioning over a short distance from the small thickness D1 to the large thickness D2.
  • the region within the inner surface 170 is filled with material, so that the light mixing rod 17 is a solid component.
  • the inner surface 170 simultaneously represents a boundary layer 1761.
  • the material on one side of the boundary layer 1761 has a different refractive index than that outside.
  • the boundary layer 1761 thus acts as a beam splitter, as it partially reflects light incident on it and partially allows it to pass through.
  • the wall 1704 of the light mixing rod 17 has a non-uniform thickness D1, D2.
  • Fig. 9 shows a light mixing rod 17 in longitudinal section, the wall 1704 of which increases in thickness from a minimum value of thickness D1 to a maximum value of thickness D2 over the length L of the light mixing rod 17, viewed from left to right.
  • Fig. 10 shows a longitudinal section of another light mixing rod 17. This consists of four partial rods 1700-1703, each of which has a different wall thickness D0-D3. At the transitions between the partial rods
  • the respective thickness changes continuously but with a steep gradient, i.e., over a short distance. It can be seen that the thickness initially decreases from left to right, before increasing again.
  • the light mixing rod shown here can be equipped with diffusers, a beam splitter coating, or, in the case of a solid version, a partially reflective boundary layer. Here, as in other examples, suitable combinations of these can also be realized.
  • Fig. 11 shows a longitudinal section of another light mixing rod 17. This consists of three partial rods 1701-1703, each of which has a different wall thickness D1-D3. A diffuser 171 is arranged on the input surface of the left partial rod 1701. At the transitions between the partial rods
  • Diffusers 172,173 are arranged in 1701 -1703.
  • Fig. 12 shows another light mixing rod 17 in cross-section. It can be seen that this one does not have a round, but rather a roughly rectangular cross-section. Its wall 1704 has a nearly constant thickness D in this cross-section.
  • Fig. 13 shows a perspective view of a light mixing rod 17. It consists of two partial rods 1701, 1702, each of whose input surfaces has a structure that acts as a diffuser 171, 172.
  • Projectors of all types typically have light conditioning in the illumination system between the light source 14R, 14G, 14B and the display element 11 to provide sharply and homogeneously illuminated imagers, which may be based on LCOS, TFT (Thin Film Transistor), DMD, or similar devices.
  • Two common methods for adequately mixing the light sources 14R, 14G, 14B are the use of multi-lens arrays (MLAs) or the use of light mixing rods 17.
  • MLAs multi-lens arrays
  • undesirable speckle effects in the image
  • moving diffusers are mounted in front of light mixing rods, among other things. These diffusers generate different scattering patterns across the time domain that are uncorrelated to one another and thus reduce the speckle contrast.
  • a laser-based projector generally requires sufficiently good mixing of the (collimated) laser light in the illumination system.
  • light mixing rods can be used, which can be designed as either hollow or filled.
  • a diffuser with a targeted scattering function is integrated into the light mixing rod 17, preferably arranged directly in front of its input surface. In this case, the angular range at the exit can be controlled.
  • the light mixing rod 17 has a sufficient length L, which allows for a sufficient number of reflections, a very homogeneous field is obtained at the exit surface, which is subsequently projected or transferred onto the imager, the display element 11, e.g., realized as a DMD or LCOS. This makes it possible, according to the invention, to generate sharp-edged and efficient illumination.
  • the display element 11 e.g., realized as a DMD or LCOS.
  • the display element 11 e.g., realized as a DMD or LCOS.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

La présente invention concerne un dispositif de génération d'une image virtuelle (VB), ayant une unité d'imagerie (1) pour produire une image qui comprend une source de lumière électroluminescente cohérente (14R, 14G, 14B), et un élément de réduction de granularité. L'élément de réduction de granularité est une tige de mélange de lumière de réduction de granularité (17).
PCT/DE2024/200072 2023-10-20 2024-07-05 Dispositif de génération d'une image virtuelle avec une tige de mélange de lumière de réduction de granularité Pending WO2025082571A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023210392.3 2023-10-20
DE102023210392 2023-10-20

Publications (1)

Publication Number Publication Date
WO2025082571A1 true WO2025082571A1 (fr) 2025-04-24

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PCT/DE2024/200072 Pending WO2025082571A1 (fr) 2023-10-20 2024-07-05 Dispositif de génération d'une image virtuelle avec une tige de mélange de lumière de réduction de granularité

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070223077A1 (en) * 2006-03-27 2007-09-27 Texas Instruments Incorporated System and method for laser speckle reduction
WO2010015478A1 (fr) * 2008-08-06 2010-02-11 Optyka Limited Procédé et appareil de projection d'images
WO2013049248A2 (fr) * 2011-09-26 2013-04-04 Osterhout Group, Inc. Modification d'affichage vidéo sur la base d'une entrée de capteur pour dispositif d'affichage près de l'œil semi-transparent
US20130300997A1 (en) * 2012-05-09 2013-11-14 Milan Momcilo Popovich Apparatus for reducing laser speckle
JP2014010181A (ja) * 2012-06-27 2014-01-20 Ricoh Co Ltd 光源装置及び投射装置
JP2015040892A (ja) * 2013-08-20 2015-03-02 セイコーエプソン株式会社 光源装置およびプロジェクター
US9335604B2 (en) 2013-12-11 2016-05-10 Milan Momcilo Popovich Holographic waveguide display
US20170192347A1 (en) * 2015-12-30 2017-07-06 Coretronic Corporation Illumination system and projection apparatus
US20200292840A1 (en) * 2014-08-08 2020-09-17 Digilens Inc. Waveguide Laser Illuminator Incorporating a Despeckler
DE102022205445A1 (de) 2021-06-02 2022-12-08 Continental Automotive Technologies GmbH Bildgebende Einheit für ein Head-Up-Display

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070223077A1 (en) * 2006-03-27 2007-09-27 Texas Instruments Incorporated System and method for laser speckle reduction
WO2010015478A1 (fr) * 2008-08-06 2010-02-11 Optyka Limited Procédé et appareil de projection d'images
WO2013049248A2 (fr) * 2011-09-26 2013-04-04 Osterhout Group, Inc. Modification d'affichage vidéo sur la base d'une entrée de capteur pour dispositif d'affichage près de l'œil semi-transparent
US20130300997A1 (en) * 2012-05-09 2013-11-14 Milan Momcilo Popovich Apparatus for reducing laser speckle
JP2014010181A (ja) * 2012-06-27 2014-01-20 Ricoh Co Ltd 光源装置及び投射装置
JP2015040892A (ja) * 2013-08-20 2015-03-02 セイコーエプソン株式会社 光源装置およびプロジェクター
US9335604B2 (en) 2013-12-11 2016-05-10 Milan Momcilo Popovich Holographic waveguide display
US20200292840A1 (en) * 2014-08-08 2020-09-17 Digilens Inc. Waveguide Laser Illuminator Incorporating a Despeckler
US20170192347A1 (en) * 2015-12-30 2017-07-06 Coretronic Corporation Illumination system and projection apparatus
DE102022205445A1 (de) 2021-06-02 2022-12-08 Continental Automotive Technologies GmbH Bildgebende Einheit für ein Head-Up-Display

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