WO2014193480A1 - Écran de projection à contraste élevé - Google Patents

Écran de projection à contraste élevé Download PDF

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Publication number
WO2014193480A1
WO2014193480A1 PCT/US2014/000135 US2014000135W WO2014193480A1 WO 2014193480 A1 WO2014193480 A1 WO 2014193480A1 US 2014000135 W US2014000135 W US 2014000135W WO 2014193480 A1 WO2014193480 A1 WO 2014193480A1
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WO
WIPO (PCT)
Prior art keywords
screen
light
head
backing sheet
display system
Prior art date
Application number
PCT/US2014/000135
Other languages
English (en)
Inventor
Fusao Ishii
Original Assignee
Fusao Ishii
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 Fusao Ishii filed Critical Fusao Ishii
Publication of WO2014193480A1 publication Critical patent/WO2014193480A1/fr
Priority to US16/231,461 priority Critical patent/US11228741B2/en

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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
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
    • 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
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
    • G02B2027/0109—Head-up displays characterised by optical features comprising holographic elements comprising details concerning the making of holograms
    • 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
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/011—Head-up displays characterised by optical features comprising device for correcting geometrical aberrations, distortion
    • 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
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens

Definitions

  • This invention relates to a display system for projecting an image on a screen. More particularly, this invention relates to projection screens with improved image quality by using wavelength selective reflecting film including at least one of hologram, multi-layer dielectrics and cholesteric liquid crystal as a screen to reflect only selected wavelengths of light to improve the brightness and contrast of images. This invention also improves the image quality of head-up-display (hereafter "HUD”) using a wavelength selective screen with improved brightness.
  • HUD head-up-display
  • Image display on a front projection screen often encounters a difficulty that the viewers of such image often experience a poor contrast due to the interferences from the ambient lights reflected from the projection screen.
  • the interferences from ambient reflection are especially pronounced in a well-lighted room. For this reason, it is often required to turn off the light in a room to provide a better view of the displayed image.
  • One method to overcome the poor view of image is to project the image with higher luminance.
  • the ambient reflections often cause uncomfortable glares in a viewer's eyes when the front projection screen is projected with the high power projectors.
  • Conventional technologies for providing high contrast projection screens are still limited by the difficulties that the screens are either manufactured with multiple layers or requiring special processes or materials. Such multiple layered screen or specially processed surface are usually complicated to fabricate and very costly.
  • Front end projection display with reflective type of display screens are therefore limited by these technical difficulties and also by the economic limitations since it is very expensive to provide the high contrast projection screen with ambient light elimination or reduction.
  • the video display system includes components of a front-projection video projector which projects an image of particular direction of polarization; polarizing lenses which polarize light radiated from room light fixtures in a direction orthogonal to that of the projected image; a polarizing filter to substantially transmit light polarized parallel to the projected image and substantially blocks light orthogonal to the projected image; and a polarization maintaining (PM) projection screen to receive the projected image for viewing by the viewers.
  • a front-projection video projector which projects an image of particular direction of polarization
  • polarizing lenses which polarize light radiated from room light fixtures in a direction orthogonal to that of the projected image
  • a polarizing filter to substantially transmit light polarized parallel to the projected image and substantially blocks light orthogonal to the projected image
  • a polarization maintaining (PM) projection screen to receive the projected image for viewing by the viewers.
  • PM polarization maintaining
  • the polarized projection screen further reduces the light intensity and leads to an undesirable effect of reducing the brightness of the display images due to the fact that only the light beams of specific polarization are reflected.
  • this method reduces the ambient light by half, but it does not provide a complete solution because there are still significant interferences caused by the remaining unnecessary ambient light.
  • Lambert et al. disclose in Patent 6,597,501 a projection screen to provide an improved contrast between projected light and ambient light.
  • the projection screen includes a light-absorbing layer and an active layer located in front of said
  • the active layer is transparent to light having a first direction of polarization and reflective to light having a second direction of polarization.
  • the reflecting polarizing layer may be provided between the active layer and the
  • Kuoda et al. disclose in Patent 6,842,282 a front projection screen that has a front shading sheet facing a viewing side formed with a transparent material.
  • the front shading sheet has a front surface provided with a plurality of horizontal, parallel, minute ridges and these minute ridges have a triangular cross section and each having an upper side surface coated with a shading layer.
  • the projection screen further includes a rear transparent filler layer formed with a material having a refractive index nearly equal to that of the transparent material of the front shading sheet.
  • transparent glass beads are embedded uniformly in a plane in the rear surface of the transparent filler layer and the rear surface of the transparent filler layer is coated with a white, reflecting adhesive layer.
  • the front projection screen has a large viewing angle, does not reflect an environmental image even in a light environment, and is capable of displaying a high-definition image having a high black level and a high contrast.
  • multiple layered projection screen embedded with beads are costly and inconvenient to implement.
  • the horizontal ridges as disclosed can only reduce the ambient interferences for light beams incident from above the screen. The horizontal ridges have no effect to reduce the ambient interferences when the incident light beams are projected from a viewer's direction or from other sides of the screen. Therefore, the contrast of image display can only be partially improved due to the limited reductions of ambient reflections.
  • Shimoda et al. disclose in Patent US7,057,809 and US7,408,709 a front projection screen having multi-layers of dielectric materials for reflection of selective wavelength of lights.
  • a front projection screen having multi-layers of dielectric materials for reflection of selective wavelength of lights.
  • the spectrum of the reflected light has wide
  • a Patent Application Publication 20050128583 discloses a high contrast projection screen by implementing a broadband projection-receiving surface.
  • the surface of the project screen is formed by applying a specialized surface production technology that utilizes purposeful partitioning of the material processes used in sub-wavelength morphology (finish) from the processes used to make super-wavelength morphology.
  • Such specialized production method however requires special processing equipment and materials thus greatly increase the cost and manufacturing complexities of the projection screen.
  • the front-end projection screen for reflecting the incident image light beams has hologram formed on a flat surface which absorbs incident lights except very narrow wavelengths coinciding with the
  • the reflectance coefficient is very high when the wavelength of incident light and the designed spectrum of reflectance by the hologram are close.
  • Hologram can also have a function of bending lights as if it forms a free shaped mirror to focus incident lights toward viewers. Because of narrow band of wavelength of reflection, the majority of ambient lights are absorbed and high contrast can be achieved even in a bright room.
  • the present invention provides a front and rear projection display systems with free shaped mirrors in a projection optical system.
  • a reflecting surface of hologram can be designed to reflect specified bands of
  • the present invention provides a method of manufacturing a projection screen by exposing photo-sensitive material with laser interference to form hologram.
  • This invention also provides a method to form free shaped lens and/or mirrors with hologram.
  • the present invention provides a high brightness screen for HUD (head-up-display), although maintaining high transparency for external view. This invention is also very useful to avoid dual images created by the two surfaces of screen plate.
  • the present invention provides a high brightness screen to project the image of the display of mobile phone on to windshield of automobile maintaining good transparency of external view, so that a drive can see both external view and the image of mobile phone's display without ghost images.
  • this invention discloses a reflecting screen that has a reflecting surface.
  • the reflecting surface includes hologram which is designed to reflect narrow bands of lights and also focus the reflected lights toward viewers.
  • This invention also discloses to make free shaped lens and/or mirrors with hologram inexpensively.
  • Fig. 1 is a block diagram of an image display system as an exemplary embodiment of this invention that illustrates how to record hologram.
  • Fig. 2 is a block diagram of an image display system as another exemplary embodiment of this invention that illustrates how to record hologram wherein the object beams are converging instead of parallel as that shown in Fig. 1.
  • Fig. 3 is a diagram to illustrate a reconstruction of the light beams by applying the hologram shown in Fig.1.
  • Fig. 4 shows an alternate embodiment of a display system of this this invention with the projector placed under the screen and the outputted light is reflected by a mirror to make a smaller display system.
  • Fig. 5 is a diagram to illustrate a reconstruction of the light beams by applying the hologram shown in Fig.2.
  • Fig. 6 shows the reflectance of the light beams as function of wavelengths for choosing the band-width of primary colors to implement in an optical system shown in Fig. 14.
  • Fig.7 is a diagram for showing another embodiment of this invention for recording the hologram wherein the optical configuration are arranged that both the reference and object beams are reversed.
  • Fig.8 shows the light paths of image display system of this invention wherein a screen for reflecting specific band-widths of wavelength and having a Fresnel lens on top of the reflecting surface to reflect parallel lights.
  • Fig.9 shows the light paths of image display system of this invention wherein a screen for reflecting specific band-widths of wavelength and having a Fresnel lens on top of the reflecting surface to reflect converged lights.
  • Fig.10 shows an exemplary embodiment that is able to record hologram with a low power laser light sources by exposing a small area at a time with a programed variable incident beam angle with Galvano-mirrors.
  • Fig. 11 is a block diagram for showing another exemplary embodiment of this invention wherein the screen is stationary and the Galvano-mirrors or micro-mirrors scan the incident beams with preprogramed angles to control the incident angle of beams at each area identical to those as shown in Fig.1 and Fig.2.
  • Fig. 12 is a block diagram for showing another exemplary embodiment of this invention to create a hologram screen which is transmissive instead of reflective.
  • Fig.13 shows a conventional HUD.
  • Fig. 14 illustrates an optical system of this invention to provide a new and improve optical configuration to overcome the problems of ghost image and low brightness that presented in the optical system shown in Fig. 13.
  • Fig.15 is a system diagram for showing an optical system to resolve the "Dark Corner" problem.
  • Fig.16 illustrates another example of screen for HUD using a mobile phone instead of a projector.
  • Fig.17 illustrates another example of screen for HUD using a mobile phone.
  • Fig.18 illustrates another example of screen for HUD using a mobile phone.
  • Fig.19 illustrates another example of a HUD using a mobile phone and shows the method to enlarge the image by adding a lens.
  • Fig-20 illustrates another example of a HUD using a mobile phone and shows the method to enlarge the image by adding a curved mirror.
  • Fig. 1 is a system diagram of an image display apparatus as an exemplary embodiment of this invention that illustrates how to record hologram.
  • the image display apparatus as shown in Fig. 1 comprises laser light sources 114, 115 and 116.
  • the laser light sources emit laser lights having coherence length long enough to create interference on a display screen 101.
  • the display screen 101 is coated with a photographic film (not specifically shown).
  • the photographic film is usually composed of photopolymer, photoresist or silver halide emulsion coated on a plate or film.
  • the laser lights source are implemented to emit primary colors comprise Blue, Green and Red laser lights.
  • the image display system further includes a shutter 113 to block a laser beam when that laser beam is not needed.
  • Each laser unit has a shutter, so that each laser can be controlled independently.
  • the image display system further includes a mirror 116 to change the direction of laser beam.
  • the image display system further includes dichroic mirrors 117 and 118 wherein the dichroic mirror 117 reflects only Green light and light of other wavelength will be transmitted and the dichroic mirror 118 reflects only Blue light and the rest of light will be transmitted.
  • a beam splitter 119 is disposed at a location to create two coherent laser beams 110 and 111.
  • the laser beam 111 is a reference beam and it is reflected by the mirror 108 and expanded by the Iens108 as if the laser beams 103 are emitted for a point source.
  • the laser beams 103 are implemented in the image display system as a reference beam to create hologram at the screen 101.
  • the beam 110 is collimated by the mirror105 to project a parallel object beam 102 for creating hologram.
  • special treatments including development and fixer are carried out to fix the holographic recording.
  • the processes are the same as photographic film development process including exposure of the film by taking a picture using a camera followed by fixing and making negative film and then using the negative file to print the picture.
  • Holographic recording is the processes of exposure and development to fix the hologram on the photographic film disposed on the screen 101.
  • the reference beam is 103 and the object beam is 102.
  • the reference and object beams interfere and record hologram at the screen 101.
  • Fig. 2 shows an alternate embodiment of an image display system this invention.
  • the display system shown in Fig. 2 is similar to that of Fig. 1 except that the object beams 102A are converging instead of parallel as that shown in Fig.1.
  • the object beams 102A are converging instead of parallel as that shown in Fig.1.
  • Fig.5 wherein the reflected light 121 is converging toward the viewer for displaying an image with increased brightness.
  • Fig. 3 is a diagram to illustrate a reconstruction of the light beams by applying the hologram shown in Fig. 1.
  • the hologram is recorded on the photographic film coated on the screen 101.
  • a display image on the screen 101 In order to display images on the screen 101 by a
  • the beam 103 projected from projector 120 in Fig. 3 must be projected along the same direction with the same wavelength as the reference beam 103 in Fig.1.
  • the reflected beam 121 is projected in the same direction as the object beam 102 in Fig. 1 instead of regular reflection direction 122 reflected from an ordinary screen without a coated photographic film recorded with the hologram as now provided in the screen 101 of the present invention.
  • the light beams 122 reflected from an ordinary mirror do not reach the viewer. Therefore, the corners will appear as dark without showing any images.
  • the hologram screen 101 of this invention now functions as a curved mirror and a wavelength selective mirror as well as ambient light absorber.
  • Fig. 3 An actual application is shown in Fig. 3 to display images of images projected from the projector 120.
  • the projected light beams 103 are reflected toward the direction of 121 and the viewer now perceives the reflected images with higher contrast and brighter image quality.
  • Fig. 4 shows an alternate embodiment of a display system of this this invention application with the projector 120 placed under the screen 101 and the outputted light is reflected by a mirror 120, so that the required space will be much smaller.
  • Fig.7 Another example of this invention is shown in Fig.7.
  • the optical configuration are arranged that both the reference and object beams are reversed.
  • Fig. 8 and Fig. 9 show the light paths of two alternate embodiments of this invention.
  • the light paths as that shown in these figures includes a screen for reflecting specific band-widths of wavelength and having a Fresnel lens on top of the surface to reflect parallel lights as shown in Fig. 8, or to reflect converged lights as shown in Fig. 9.
  • the focal lengths of the Fresnel mirrors in Fig. 8 and Fig. 9 are different. Both are Fresnel mirrors, but with different focal length. Depending of the distance of viewers, the Fresnel lenses of different focal lengths may provide better images for a very far viewer's position as that shown Fig. 9 and alternatively in a closer viewer's position as Fig. 8.
  • the reflecting surface may also be made of
  • the purpose of the screen of multi-layers of dielectrics or cholesteric liquid crystal and a Fresnel lens adhered on the reflecting surface is to achieve higher contrast in a bright room with front projector.
  • the function of this screen is to reflect only the primary colors and absorb all the rest of colors, so that the contrast of reflected image becomes higher. High contrast is achieved when the black image is as dark as possible and bright image is as bright as possible because the contrast is defined as the ratio of brightest / "darkest".
  • This invention resolves the problem caused by the ambient reflection that the black image of front the projector does not become black, but gray.
  • the black pixels of the images now are now shown with a darker color thus significantly improves the contrast.
  • the spectrum of visible light is from 390nm to 700nm, about 310nm width.
  • the screen reflects only blue (from 450 to 460nm, having 10nm width) and green from (530 to 540 nm having 10nm width) and red (640 to 650 having 10nm width) and absorb all the rest of wavelength and the ambient light
  • 100:1 contrast ratio is about same as that of regular LCD TVs. If we can make the reflection of ambient light in a bright room 1/10, front projectors will have as good picture quality as LCD.
  • the purpose of multi-layer dielectric and Cholesteric liquid crystal is to reflect only primary colors, more precisely only specified bandwidths of colors, in other words, wavelength selective reflection. The rest of colors passes through the film and will be absorbed by the backing sheet which is black.
  • the purpose of Fresnel lens or mirror is to change the directions of reflected light beams from diverging directions to converging directions.
  • Fig. 10 is a system diagram for showing another exemplary embodiment of this invention.
  • the power of laser light sources needs to increase.
  • the cost of laser light source is exponential to the power. Therefore it is critically important to provide an image system that can record a large sheet of hologram with a low power laser light sources.
  • Fig.10 shows an exemplary
  • Galvano-mirrors131 and 132 are able to record hologram with a low power laser light sources by exposing a small area at a time with a programed variable incident beam angle with Galvano-mirrors131 and 132.
  • the display system as shown can control the reflecting angle in a single dimension as well as two dimensions, and scan the exposed area.
  • the Galvano-mirror as shown in Fig.10 is implemented to adjust the angle of incident beam with the screen moved to scan the exposed area.
  • Fig. 11 is a system diagram for showing another exemplary embodiment of this invention to achieve the same purpose of a system as shown in Fig. 10.
  • the screen is of this embodiment is stationary and the Galvano-mirrors or micro-mirrors 131 and 132 scan the incident beams 102 and 103 with preprogramed angles so that the incident angle of beams at each area are controlled to be identical to those as shown in Fig.1 and Fig.2.
  • Fig. 12 is a system diagram for showing another exemplary embodiment of this invention to create a hologram screen which is transmissive instead of reflective as the previous examples.
  • the reference beam 102 and the object beam 103 are - I I - from the same side.
  • Mirrors131 and 132 may be implemented with Galvano-mirrors to scan the beams as that shown in Fig. 11. Alternately, mirrors131 and 132 can be curved mirrors or a combination of lens and mirror, so that the entire screen can be exposed at a time. In this case, the reconstruction beam will be same as 102 and the transmissive beam is103A.
  • Fig.13 shows a prior art of HUD.
  • a projector131 is placed on a compartment of automobile.
  • the projected light is reflected by a mirror 143 and the reflected light 137 is reflected again by the windshield 132.
  • the incident light beam will be split into two beams.
  • a first beam 134 is projected toward the viewer 144.
  • a second beam 135 is projected toward the inside surface of glass 145 and split into two beams.
  • the beam 136 is transmitted outside of glass and the other beam 137 is reflected to the inside of glass and then transmitted toward the viewer 144. Both of these two beams 134 and 135 will come to the viewer 144 and these created dual images 138 and 139.
  • the first beam 134 is brighter than the second beam 135 and the second image 139 is often considered as a ghost image. This ghost image is very annoying to the viewer 144.
  • Another problem of the system in Fig.13 is that the reflectance of the first beam 134 is very low. If the angle of windshield 142 is 22 degrees and the angle of the reflected beam 137 is 44 degrees, the reflectance of the first beam 134 will be about 15% and that of the second beam 135 is about 10%. Even the addition of both the beams 134 and 135 will be about 25%. Under bright ambient such as direct Sun beam, it will be difficult to get high contrast or almost not visible. If a mirror is placed at the windshield, the reflectance and ghost image problems will be resolved, but the viewer cannot see through the windshield. The view cannot be obstructed for safety of driving.
  • Fig. 14 illustrates an optical system of this invention to provide a new and improve optical configuration to overcome these problems of ghost image and low brightness.
  • a screen of this invention 133 is added to the HUD system shown in Fig. 13, the ghost image is eliminated and also the reflectance by the screen 133 as a wavelength selective reflective film that may comprise one of cholesteric liquid crystal, multi-layer dielectric or hologram is substantially improved.
  • the rest of colors are passed through the film.
  • the purpose of this film is to increase the reflection by the windshield, although the majority of incoming light (to see through the windshield) will pass though the film. In other words, the viewer can see through the windshield and also can see the reflected image.
  • the majority of incoming light to see through the windshield
  • wavelength selective reflection film can reflect nearly 90% of primary colors (Blue, Green and Red) even though the rest of light can be transmitted. This means that almost all of the light from the projector 131 is reflected toward the viewer 144 and no ghost image is created.
  • the majority of external light 134 is transmitted through the windshield 132 and the screen 133, assuming the external light contains nearly uniform spectrum of light and only narrow band width of primary colors are reflected. This assumption is very reasonable, because the spectrum of the Sunlight is very broad and uniform.
  • the band-width of primary colors as the example in Fig. 6, 85% of transmission can be achieved.
  • this invention provides three times brighter image with no ghost image without scarifying see-through capability.
  • Fig.15 is a system diagram for showing an optical system to resolve the "Dark Corner” problem.
  • a projector projects light beams 137 to the screen 133 with hologram.
  • a conventional screen without the hologram will reflect the beam 137 toward 147 instead of projecting toward the designated direction 148 for the viewer 144.
  • Fig.15 illustrates an embodiment of this invention by placing a flat hologram having reflected beams as 148 with the reconstruction beams 137 reconstructed and projected from the hologram 133, and the beams are reflected as if there is a curved mirror 146 and the dark corner problem is resolved.
  • this embodiment of using the screen with hologram has the benefits of both narrow band spectrum selectivity and powered lens action of recording object beams reflected by curved mirrors with a focal point.
  • Fig.16 illustrates another example of screen for HUD using a mobile phone instead of a projector.
  • the mobile phones are now provided with image display having greater brightness and higher resolution and are also implemented with more navigation software.
  • Looking back and forth between an internal navigation system and external view causes high risk of driving. Especially elder people cannot adjust their focal length of eyes fast enough to catch up with the external view. Therefore, it will be much safer if the image of navigation map in their mobile phone is projected onto the windshield.
  • This invention provides an improved solution to achieve this purpose.
  • a mobile phone 151 is placed on the compartment of automobile.
  • a wavelength selective screen 152 with a transparent backing sheet or plate is placed as in Fig.16.
  • the screen 152 functions as if a mirror and an image 153 is created and the viewer 144 can see the image 153. Because of the transparent backing sheet, the screen 152 is transparent and the viewer 144 can see through the windshield.
  • the "Corner Dark" problem can be avoid, if the screen 152 has a holographic reflector or lens or Fresnel mirror.
  • a light shield 154 is placed as in Fig. 16.
  • the mobile phone 151 requires an operation by the viewer, it requires a user interface with button(s) 158 and/or voice recognition. If the system has only one reflective mirror as in Fig.
  • the display must be reversed horizontally by software.
  • the system will be often used under Sunlight.
  • the Sunlight will worsen the contrast of image with strong ambient light as well as damaging the screen 152 with strong ultra-violet (UV) light.
  • Additional UV shielding film or coating is necessary to protect the screen. It is also very helpful to improve contrast by adding photochromic coating and/or film, so that the light transmission can vary depending on the ambient brightness.
  • Fig.17 illustrates another example of screen for HUD using a mobile phone.
  • the image has to be reflected twice by mirrors as shown in Fig.17.
  • a mobile phone 151 is place on the compartment of automobile.
  • An additional mirror 156 is placed between the mobile phone and the first mirror 152.
  • the second mirror can be a regular mirror when the first mirror is wavelength selective mirror.
  • a user interface is placed at 157 with buttons 158 or voice recognition.
  • Fig.18 shows a screen for HUD using a mobile phone.
  • a HUD including a mobile phone When a HUD including a mobile phone is placed on a dashboard of car under strong Sunlight, the mobile phone can be over heated.
  • Fig-18 shows a heat sink (159) attached to the mobile phone.
  • the heat-sink can be coated with black surface so that heat dissipation is improved.
  • Fig.19 illustrates another example of a HUD using a mobile phone and shows the method to enlarge the image by adding a lens(161).
  • the size of mobile phone is sometimes not large enough to see the display, such as navigation map. Viewers often have desire to see a larger image than the size of display of mobile phone.
  • the lens( 161) magnifies the display of mobile phone and the mirror(152) reflects the magnified image(155) to the image(153) for the viewer.
  • Fig-20 illustrates another example of a HUD using a mobile phone and shows the method to enlarge the image by adding a curved mirror(163).
  • the size of mobile phone is sometimes not large enough to see the display, such as navigation map. Viewers often have desire to see a larger image than the size of display of mobile phone.
  • the curved mirror (163) magnifies the display of mobile phone and the mirror(152) reflects the magnified image(155) to the image(153) for the viewer.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

La présente invention concerne un système d'affichage d'images comportant un écran réfléchissant possédant une surface réfléchissante. La surface réfléchissante comporte un hologramme qui réfléchit des bandes étroites du spectre de la lumière incidente, vers une direction désirée. Un système d'affichage par projection comporte un ou plusieurs miroirs réfléchissants avec un hologramme de manière que l'image peut être projetée presque à la verticale ou à une courte distance. Cette invention peut être utilisée comme affichage tête haute avec une luminance améliorée et permettant l'élimination du bruit d'image fantôme.
PCT/US2014/000135 2013-05-28 2014-05-28 Écran de projection à contraste élevé WO2014193480A1 (fr)

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US16/231,461 US11228741B2 (en) 2013-05-28 2018-12-22 Seamless tiled displays

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US201361855948P 2013-05-28 2013-05-28
US61/855,948 2013-05-28

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104865566A (zh) * 2015-05-21 2015-08-26 上海理工大学 一种基于关联成像的距离测量方法
DE102015104085A1 (de) 2015-03-18 2016-09-22 Carl Zeiss Jena Gmbh Vorrichtung zur Dateneinspiegelung
WO2017055149A1 (fr) * 2015-09-28 2017-04-06 Carl Zeiss Jena Gmbh Dispositif de projection de données
CN108803032A (zh) * 2018-05-29 2018-11-13 上海交通大学 一种反射式增强现实显示系统及设备

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