WO2013178925A2 - Viseur tete haute compact a faible consommation d'energie - Google Patents
Viseur tete haute compact a faible consommation d'energie Download PDFInfo
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- WO2013178925A2 WO2013178925A2 PCT/FR2013/051172 FR2013051172W WO2013178925A2 WO 2013178925 A2 WO2013178925 A2 WO 2013178925A2 FR 2013051172 W FR2013051172 W FR 2013051172W WO 2013178925 A2 WO2013178925 A2 WO 2013178925A2
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- 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
-
- 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
- G02B27/0149—Head-up displays characterised by mechanical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
-
- 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
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
-
- 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
- G02B2027/0132—Head-up displays characterised by optical features comprising binocular systems
-
- 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
- G02B27/0149—Head-up displays characterised by mechanical features
- G02B2027/015—Head-up displays characterised by mechanical features involving arrangement aiming to get less bulky devices
Definitions
- the present invention relates to a head-up display, also called head-up display, head-up collimator or head-up display system, compact and having a large exit pupil. More particularly, the present invention relates to such a viewfinder whose energy consumption is reduced.
- the head-up displays also known as the HUD, of the English Head-Up Display
- HUD augmented reality display systems
- Such systems can be placed in the visor of a helmet, in the cockpit of an aircraft or within the cabin of a vehicle. They are thus positioned at a small distance from the eyes of the user, for example a few centimeters or tens of centimeters.
- Figure 1 illustrates, schematically, the operation of such a device.
- a semitransparent blade 10 is placed between the eye of the user 12 and a scene to be observed 14.
- the objects of the scene to be observed are generally located at infinity or at an angle important distance from the observer.
- a projection system is planned.
- This system comprises an element for displaying an image 16, for example a screen, located at the focal point object of an optical system 18.
- the image displayed on the screen is thus infinitely collimated by the optical system 18. The user does not have to make an effort of accommodation, which limits the visual fatigue of the latter.
- the projection system is placed perpendicular to the axis between the scene and the observer so that the beam from the optical system 18 reaches the semi-transparent plate perpendicular to this axis.
- the beam from the optical system 18 thus reaches the semi-transparent plate 10 at an angle of 45 ° with respect to its surface.
- the semi-transparent plate 10 combines the image of the scene 14 and the image resulting from the projection system 16-18, from which
- the observer 12 displays an image comprising the projected image superimposed on the image of the scene 14.
- the observer's eye In order to visualize the image projected by the projection system 16-18, the observer's eye must be placed in the reflection zone of the beam coming from the optical system 18 on the plate 10.
- An important constraint to be respected is to hold account possible movements of the head of the user in front of the projector, and therefore to provide a beam output of the optical system 18 as wide as possible. In other words, it is necessary to provide an optical system 18 whose output pupil is large, for example between a few centimeters and a few tens of centimeters, so that the head movements of the observer do not imply a loss of light. projected information.
- Another constraint of head-up systems is to provide a relatively compact device. Indeed, significant space constraints weigh on these devices ⁇ sitifs, especially when used in aircraft cockpits or car interiors of limited volume. To limit the size of head-up systems, it is necessary to provide devices whose focal length is reduced.
- An object of an embodiment of the present invention is to provide a compact head-up viewfinder having a large exit pupil.
- An object of an embodiment of the present invention is to provide such a device whose power consumption is reduced.
- an embodiment of the present invention provides a head-up viewfinder, comprising a set of optical subsystems formed in the same plane and whose focal length increases with the distance from the main optical axis of the viewfinder, comprising in in addition to sub-screens whose positions and dimensions are defined according to the length of the optical path, the focal distances of the optical subsystems and a maximum allowed movement length in a plane perpendicular to the optical axis and located at a distance equal to the length of the optical path, so that the information projected by all subscreens is viewed over any the authorized movement length.
- the positions and the dimensions of the subscreens are further defined according to the average deviation between the two eyes of a person.
- the optical subsystems are of the same dimensions, each subscreen being placed in the object focal plane of the associated optical subsystem.
- the optical subsystems are regularly distributed in a plane perpendicular to the main optical axis of the viewfinder.
- the projected information is an image distributed over all subscreens.
- the subscreens are disjoint.
- the maximum allowed movement length is zero and the view of the observer is monocular
- the subscreens being placed symmetrically on either side of the axis.
- main optical viewfinder each sub-screen having a length along the first axis equal to fj_L / D, fj_ being the focal length of the optical subsystem of rank i on either side of the main optical axis of the device, the subscreens being spaced edge to edge by a distance equal to L + L / 2D (f -j-f, L being the size of the optical subsystems, where D is the length of the optical path.
- the maximum permitted movement length is non-zero and the view of the observer is monocular
- the subscreens being placed symmetrically on either side of the main optical axis of the viewfinder, the center of a sub-screen of rank i on either side of the main optical axis of the device being placed with respect to the center of the rank i-1 sub-screen at a distance equal to L + Lf -j_ / D, each sub-screen having a length along the first axis equal to fj_ / D (L + B), within the limit of one zone, centered on the optical axis of the associated optical subsystem, of a dimension equal to: i ° 1 ⁇ 2 ( ⁇ 3 ⁇ 4) ⁇
- the maximum allowed movement length is zero and the view of the observer is binocular, the sub-screens being placed symmetrically on the other hand.
- each subscreen having a length along the first axis equal to fj_L / D, the center of a sub-screen of rank i on either side of the the main optical axis of the device being placed relative to the center of the rank i-1 sub-screen at a distance equal to 25 L + L / 2D (fj + f, fi and L being, respectively, the focal length and the width of the rank i subsystem, where D is the length of the optical path.
- the maximum movement length along a first axis, the maximum movement length
- each sub -screen having a length along the first axis equal to fj_L / D, the center 35 of a sub-screen of rank i on either side of the optical axis the principal of the device being placed relative to the center of the sub-screen of rank i-1 at a distance equal to L + Lf- j _ / D, f-j_ and L being, respectively, the focal length and the width of the sub-screen.
- the maximum allowed movement length is greater than an average difference between the two eyes of a person and the view of the observer is binocular, the subscreens being placed symmetrically on either side of the main optical axis of the viewfinder, each sub-screen having a length along the first axis equal to f -j_ / D (L + B- y), within the limit of a zone , centered on the optical axis of the associated optical subsystem, of a dimension equal to:
- each sub-screen consists of a matrix of organic light-emitting diode cells.
- Figure 1 previously described, illustrates the principle of operation of a head-up display
- Figure 2 illustrates the principle of operation of a head-up display according to an embodiment of the present invention
- Figures 3 to 5 illustrate different observations made using the devices of Figures 1 and 2;
- Figures 6 to 8 illustrate optical structures for determining geometric rules for designing a screen of an improved head-up display;
- FIGS 9 and 10 illustrate the subscreen distribution according to one embodiment of the present invention.
- a compact head-up viewfinder that is to say comprising a projection system having a space of less than a few tens of centimeters and having a large exit pupil
- elementary projection systems each projection subsystem operating in the same way and projecting a portion of an image to be superimposed on a real image.
- Figure 2 schematically shows a head-up viewfinder according to one embodiment.
- the device comprises a semitransparent plate 10 which is placed between the observer 12 and a scene to be observed 14.
- the surface of the semi-transparent plate 10 forms an angle, for example of 45.degree. axis between the scene and the observer, and does not disturb the arrival of rays from the scene to the observer.
- the semitransparent plate can be replaced by an interference filter performing the same function as a semi-transparent plate.
- a projection system of an image to be superimposed on the image of the scene is planned. It comprises an image source 24, for example a screen, associated with an optical system 26.
- the projection system is placed here perpendicularly to the axis between the scene and the observer, and the beam that comes from the Optical system 26 reaches the semi-transparent plate 10 perpendicular to this axis.
- the semi-transparent plate 10 combines, i.e. superimposes, the image of the scene 14 and the projected image from the optical system 26, whereby the observer views the superimposed projected image to the real image of the scene 14.
- the system of Figure 2 operates in the same way as the system of Figure 1.
- the optical system 26 comprises a set of optical subsystems 26A, 26B and 26C.
- the image source 24, for example a screen is divided into several subscreens. In the sectional view of FIG. 2, three sub-screens 24A, 24B and 24C are shown. Note that this number may be more or less important.
- Each sub-screen 24A, 24B and 24C is associated with an optical subsystem 26A, 26B, 26C. Contrary to what is shown, the subscreens can be shifted from the optical axes of the associated optical subsystems, as we shall see below, and be formed in separate planes.
- the projection system therefore comprises a plurality of sub-projectors.
- each optical subsystem has an opening, called elemental, "moderate".
- the elementary aperture of an optical subsystem is defined as the ratio of its own focal distance to the size of its own exit pupil.
- the parallel association of the sub-projectors thus makes it possible to obtain an optical system whose opening is particularly weak insofar as, for the same distance between screen and projection optics, a large total exit pupil is obtained. , equal to the sum exit pupils of each optical subsystem.
- the optical system thus has a small opening while being formed of simple elementary optical structures. The compactness of the complete device is thus ensured.
- 24A, 24B, 24C displays some of the information, the complete information being recombined by the brain of the observer. For this, the image that we want to project in augmented reality is divided into blocks that are distributed over the different subscreens.
- the screen 24 may be comprised of a cell array comprising organic light emitting diodes ⁇ (English OLED, Organic Light-Emitting Diode) or a matrix of LCD sub-screens or picture .
- organic light emitting diodes ⁇ English OLED, Organic Light-Emitting Diode
- LCD sub-screens or picture a matrix of LCD sub-screens or picture .
- one or more layers of organic materials are formed between two conductive electrodes, the assembly extending on a substrate.
- the upper electrode is transparent or semi-transparent and is usually made of a thin layer of silver whose thickness may be of the order of a few nanometers. When a suitable voltage is applied between the two electrodes, a phenomenon of electroluminescence appears in the organic layer.
- FIGS 3 to 5 illustrate different observations made using the devices of Figures 1 and 2.
- FIG. 3 is illustrated an image 30 which is displayed on a screen such as the screen 16 of FIG. 1 (thus with a single-shot optic).
- a frame 32 which surrounds the image 30, schematically represents the exit pupil of the projection device 18 of FIG. 1.
- the exit pupil 32 is slightly wider than the displayed image. by the screen 30.
- the observer observes all the information contained in the image 30, as long as the observer's head remains in what is called the "eye box" the device (in English eye-box or head motion box).
- This "eye box” is defined as the space where the observer can move his head while receiving all of the projected information. In other words, as long as the observer's head remains in the eye box, he receives all the projected information.
- FIG. 4 illustrates the view of the information by an observer, in the case where the head-up viewfinder comprises a single-pupillary optics (case of FIG. 1), when the head of the observer leaves the eye box. .
- the exit pupil 34 portion seen by the observer
- the image 30 which implies that only a portion 30 'of the image 30 is seen by the observer.
- FIG. 5 illustrates the view of the information by an observer, in the case where the head-up viewfinder has a multi-pupillary optic (FIG. 2), when the head of the observer leaves the eye box.
- the exit pupil 36 seen by the observer is shifted with respect to the image 30, which implies that only a portion 30 "of the image 30 is accessible to the observer.
- the portion 30 is viewed in a fragmented manner.
- each sub-projector has its own eye box.
- the observer leaves the global eye box of the device, it also leaves the eye box of each of the projectors, which causes a frag ⁇ tation of the image seen by the observer.
- the final image seen by the observer consists of a set of vertical bands 30 "(in the case of a lateral displacement of the observer's head) of portions of the image 30.
- the positioning and the size of the sub-screens of a head-up viewfinder with multi-pupil optics must be adapted according to a predefined desired eye box.
- a predefined desired eye box Various cases will be described below, starting from an eye box of zero size (only one position of the observer ensures the reception of all the information), the projected image filling the whole of the surface of the exit pupil.
- Figures 6 to 8 illustrate optical structures for determining geometric rules for enhanced placement of OLED subscreens.
- the goal is to determine the area of each subscreen useful when the observer closes an eye (monocular vision), that is to say the portion of each subscreen seen by the eye, if the eye is placed on the main optical axis of the device at a distance D of optical subsystems 26j_, 262- the distance D between the optical subsystems 26] _ and 262 and the observer is called optical path.
- the optical path and hence the distance D that will be considered later, corresponds to the light path between the optical subsystems. 26 ] _ and 262 and the observer, for example through the semi-reflective plate 10.
- FIG. 7 a device comprising three sub-projectors consisting of three sub-screens 24 ' ] , 24 * 2 and 24 * 3, formed on a substrate 40, opposite three optical subsystems 26 ' ] , 26 * 2 and 26' 3.
- the substrate 40 is placed in the object focal plane of the optical subsystems 26 ', 26 * 2 and 26' 3.
- the central sub-projector (24 '2, 26 * 2) has its optical axis coincident with the main optical axis of the device and the peripheral sub-projectors extend symmetrically with respect to the main optical axis of the device.
- the portion 42 'of a peripheral sub-screen accessible in monocular vision by an eye placed on the main optical axis of the device, at a distance D from the optical system 26.
- the surface of this sub-screen visible by an eye (monocular vision) placed on the main optical axis of the device is equal to fL / D.
- FIG. 8 shows the case of FIG. 6 with a projector comprising two sub-projectors each consisting of a sub-screen 24 ] , 242 and an optical subsystem 26 ]. to the subscreen region which is accessible to an observer in binocular vision.
- the two eyes of the observer R and L are placed on either side of the main optical axis of the device, at a distance y / 2 of this main optical axis (y being thus the gap between the two eyes of the observer).
- the right eye R respectively the left eye L
- the useful surface of the subscreen because of the superposition of the regions seen by the two eyes, the useful surface of the subscreen
- the head of the observer In order to define the useful area of each of the subscreens in operation, it must be taken into account that the head of the observer is likely to move, according to a maximum amplitude that is predefined. Note that, vertically, the head of an observer is less subject to movement and vision is monocular. However, the following teachings apply as much to authorized vertical movement of the head as to lateral movement.
- the maximum accepted movement length of the head (equal to the size of the eye box along a first axis, for example horizontal) will be called B.
- B thus corresponds to the maximum peak-to-peak amplitude in motion of the accepted head.
- Subscreen positioning rules are defined below so that if the observer's head moves in a direction a distance less than or equal to B / 2, or in an opposite direction of a distance less than or equal to B / 2, the view of the information given by all the subscreens is always complete, ie each pixel of each subscreen is seen at least by one both eyes of the observer when describing the entire eye box.
- the sizing and positioning rules of each of the subscreens vary according to whether it is desired to have an amplitude in motion that is zero or not authorized, and that one places oneself in binocular or monocular vision. (eg binocular vision horizontally, monocular vertically).
- the inventor has shown that the reasoning leading to the sizing of the sub-screens in a direction in which the vision is monocular with a non-zero eye box also applies to the case where the vision is binocular with an eye box B is greater than the distance between the two eyes y of the observer.
- Figures 9 and 10 illustrate rules for positioning and sizing sub-screens and optical subsystems according to one embodiment.
- optical sub-systems adapted to their location in the device. More particularly, the further one moves away from the main optical axis of the device, the more the optical subsystems work in extreme conditions of illumination. It is planned here to reduce the opening constraints of the optical subsystems in a progressive manner when moving away from the main optical axis of the device. For this, optical subsystems are provided whose focal length fj_ increases progressively as one moves away from the main optical axis of the device. The subscreens are placed in the focal plane of the associated optical subsystems, ie they are placed farther and farther away from the optical subsystems as we move away from the axis. main optical projection device.
- the sub-screens 24], 242 and 243 are placed in the object focal plane of the optical subsystems 26 ] _, 262, 263 such that, in monocular vision, the reconstituted image fills the entire exit pupil.
- the eye box has zero B dimension (the slightest movement of the observer's head implies a loss of information).
- a simple calculation makes it possible to obtain that the subscreens have a length in the plane of the figures equal to fj_L / D, fj_ being the focal length of the associated optical subsystem.
- the sub-screens are more or less offset from the optical axis of the associated optical subsystem, as a function of their distance from the main optical axis of the projection system.
- regions 50 ] _, 502 and 5 ⁇ 3 which are placed in the object focal plane of optical subsystems 26 ] _, 262 and 263 and which are centered on the optical axis optical subsystems 26 ] _ to 263.
- Each region 50 i being the rank of the sub-projector on either side of the main optical system itif
- each sub-screen 24 ] to 243 is placed opposite a portion of the region 50 ] at 5 3 corresponding to its rank, that is to say that the sub-screens located at ends of the device are placed at the ends of the regions 50 ] _ 5 ⁇ 3 on both sides of the device.
- the illustration of the regions 50 ] _ to 5 ⁇ 3 makes it possible to represent the part of the image that the corresponding sub-screen must display: the sub-screens at the periphery thus display a peripheral portion of the image.
- an eye box is desired to obtain, always by monocular vision at a distance D of the projection device, a dimension equal to B] _ relatively low.
- the solid lines delimit the zone of the visible focal plane when the eye moves to the left in the figure (by a distance B ] _ / 2) and the dashed lines delimit the zone of the visible focal plane when the 'eye moves right in the figure (from a distance B ] _ / 2).
- the subscreen must be positioned and sized to match the field of view of visible regions at both ends of the eye box .
- an eye box still in monocular vision at a distance D from the projection device, a dimension equal to B2 relatively large.
- the solid line delimits the limit of the visible focal plane when the eye moves to the left in the figure (by a distance B2 / 2) and the dashed line delimits the limit of the visible focal plane when the eye moves to the right in the figure (from a distance B2 / 2).
- each sub-screen has a dimension greater than fj_L / D.
- the image to be superimposed on the real image is in these two cases distributed over portions of each of the subscreens of dimensions equal to fj_L / D.
- the information displayed on the rest of the subscreens is redundant with the neighboring subscreens, which ensures the dimensions of the desired eye boxes.
- Figures 9 and 10 provide the following sizing and positioning rules. It is chosen to form a matrix of QxQ 'sub-projectors, Q and Q' which can be odd or even. In both directions of the projector, the sub-projectors are arranged symmetrically with respect to the main optical axis of the projector.
- the sub-screens are placed symmetrically with respect to the main optical axis of the device, have dimensions equal to fj_L / D and are spaced edge to edge by a distance L + L / 2D (f- j _-f (the center of the sub-screen of rank i is placed relative to the center of the sub-screen of rank i-1 at a distance equal to L + Lfj_ / D).
- the subscreens have dimensions equal to fj_ / D (L + B).
- the edge to edge of the subscreens is then less than L.
- the magnification of the subscreens is made so as not to leave an area, centered on the optical axis of the associated optical subsystem, of a dimension equal to: the sum in the above value being the sum of the focal lengths of the optical subsystems used in the sub-projector.
- all the subscreens have dimensions equal to fj_L / D and are distant edge to edge of a distance L + L / 2D
- the center of the rank i sub-screen is remote from the center of the rank i-1 sub-screen of L + Lf- j _ / D.
- the subscreens are centered in the same manner as above (the center of the subscript of rank i is placed at a distance of distance from the center of the sub-screen of rank i-1 equal to L + L / 2D (f- j _ + f) but enlarge by (By) f- j _ / 2D on both sides. therefore have a dimension equal to (L + By) fj_ / D.
- the edge-to-edge distance of the subscreens is therefore less than L.
- the magnification of the subscreens occurs so as not to exceed an area, centered on the optical axis of the associated optical subsystem, of a dimension equal to:
- the sum above is the sum of the focal lengths of the optical subsystems used in the sub-projector.
- the dimensions f 1 increasing as a function of the distance of the optical subsystems from the axis main optical device, can be defined using a ray tracing software based on optical performance expected in terms of resolution.
- optical aberrations have two origins that accumulate: the paraxiality coming from the opening of the optics (size of the optical subsystem) and that coming from the decentering of the subscreen.
- the dimensions fj_ are defined to compensate for the aberration provided by the decentering, while attenuating the aberration originating from the size of the optical subsystems.
- the formation of subscreens defined in the above manner makes it possible to limit the active screen area on the surface of the substrate 40, and therefore the total consumption of the screen, while ensuring visibility of the recombined image. throughout the area of a movement of amplitude B / 2 on either side of the head of the observer.
- the increase in the focal length of the optical subsystems as a function of their distance from the main optical axis avoids misuse of these devices.
- the sub-screens 24-j may be formed on a substrate having a topology adapted to the different focal lengths of the associated optical subsystems 26.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2873665A CA2873665A1 (fr) | 2012-05-28 | 2013-05-27 | Viseur tete haute compact a faible consommation d'energie |
EP13728502.9A EP2856220A2 (fr) | 2012-05-28 | 2013-05-27 | Viseur tete haute compact a faible consommation d'energie |
US14/403,492 US20150103409A1 (en) | 2012-05-28 | 2013-05-27 | Compact and energy-efficient head-up display |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1254899 | 2012-05-28 | ||
FR1254899A FR2991061B1 (fr) | 2012-05-28 | 2012-05-28 | Viseur tete haute compact a faible consommation d'energie |
Publications (2)
Publication Number | Publication Date |
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WO2013178925A2 true WO2013178925A2 (fr) | 2013-12-05 |
WO2013178925A3 WO2013178925A3 (fr) | 2014-03-13 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/FR2013/051172 WO2013178925A2 (fr) | 2012-05-28 | 2013-05-27 | Viseur tete haute compact a faible consommation d'energie |
Country Status (5)
Country | Link |
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US (1) | US20150103409A1 (fr) |
EP (1) | EP2856220A2 (fr) |
CA (1) | CA2873665A1 (fr) |
FR (1) | FR2991061B1 (fr) |
WO (1) | WO2013178925A2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US10539791B2 (en) | 2014-09-02 | 2020-01-21 | Ostendo Technologies, Inc. | Split exit pupil multiple virtual image heads-up display systems and methods |
US10845591B2 (en) | 2016-04-12 | 2020-11-24 | Ostendo Technologies, Inc. | Split exit pupil heads-up display systems and methods |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2611926B1 (fr) * | 1987-03-03 | 1989-05-26 | Thomson Csf | Dispositif de visualisation collimatee en relief |
US20040108971A1 (en) * | 1998-04-09 | 2004-06-10 | Digilens, Inc. | Method of and apparatus for viewing an image |
DE102006047941B4 (de) * | 2006-10-10 | 2008-10-23 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Vorrichtung zur Homogenisierung von Strahlung mit nicht regelmäßigen Mikrolinsenarrays |
US9223137B2 (en) * | 2010-10-08 | 2015-12-29 | Seiko Epson Corporation | Virtual image display apparatus |
-
2012
- 2012-05-28 FR FR1254899A patent/FR2991061B1/fr not_active Expired - Fee Related
-
2013
- 2013-05-27 EP EP13728502.9A patent/EP2856220A2/fr not_active Withdrawn
- 2013-05-27 US US14/403,492 patent/US20150103409A1/en not_active Abandoned
- 2013-05-27 WO PCT/FR2013/051172 patent/WO2013178925A2/fr active Application Filing
- 2013-05-27 CA CA2873665A patent/CA2873665A1/fr not_active Abandoned
Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
---|---|
CA2873665A1 (fr) | 2013-12-05 |
FR2991061A1 (fr) | 2013-11-29 |
US20150103409A1 (en) | 2015-04-16 |
EP2856220A2 (fr) | 2015-04-08 |
FR2991061B1 (fr) | 2015-02-27 |
WO2013178925A3 (fr) | 2014-03-13 |
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