WO2011058156A1 - Device for displaying images stacked over an image of a surrounding scene, and associated manufacturing method - Google Patents

Device for displaying images stacked over an image of a surrounding scene, and associated manufacturing method Download PDF

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Publication number
WO2011058156A1
WO2011058156A1 PCT/EP2010/067428 EP2010067428W WO2011058156A1 WO 2011058156 A1 WO2011058156 A1 WO 2011058156A1 EP 2010067428 W EP2010067428 W EP 2010067428W WO 2011058156 A1 WO2011058156 A1 WO 2011058156A1
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WO
WIPO (PCT)
Prior art keywords
device
blade
image
according
plates
Prior art date
Application number
PCT/EP2010/067428
Other languages
French (fr)
Inventor
Laetitia Landais
Philippe Patry
Original Assignee
Sagem Defense Securite
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR0958065 priority Critical
Priority to FR0958065A priority patent/FR2952728B1/en
Application filed by Sagem Defense Securite filed Critical Sagem Defense Securite
Publication of WO2011058156A1 publication Critical patent/WO2011058156A1/en

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Other optical systems; Other optical apparatus
    • G02B27/10Beam splitting or combining systems
    • G02B27/14Beam splitting or combining systems operating by reflection only
    • G02B27/147Beam splitting or combining systems operating by reflection only using averaging effects by spatially variable reflectivity on a microscopic level, e.g. polka dots, chequered or discontinuous patterns, or rapidly moving surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00Producing optical elements, e.g. lenses or prisms
    • B29D11/0074Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Other optical systems; Other optical apparatus
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Other optical systems; Other optical apparatus
    • G02B27/01Head-up displays
    • G02B27/017Head mounted
    • G02B27/0172Head mounted characterised by optical features
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Other optical systems; Other optical apparatus
    • G02B27/10Beam splitting or combining systems
    • G02B27/14Beam splitting or combining systems operating by reflection only
    • G02B27/144Beam splitting or combining systems operating by reflection only using partially transparent surfaces without spectral selectivity
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Other optical systems; Other optical apparatus
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/0118Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility

Abstract

The invention relates to a device (1) for displaying images (5) stacked over an image (4) of a surrounding scene, comprising: a combining leaf (10) consisting of a material transparent to the image (4) of the scene, and having two surfaces (11, 12) parallel to one another, and plates (20) which are at least semi-reflective of the images (5) being stacked over the image (4) of the scene, and which are arranged at an angle relative to surfaces (11, 12) and parallel to one another in the leaf (10), the device being characterized in that the plates (20) have a characteristic size (d) which is small relative to a characteristic size of the leaf (10). The invention also relates to a method for manufacturing the aforesaid device.

Description

A superimposed image to an image display of a surrounding scene, and manufacturing method thereof

GENERAL TECHNICAL FIELD

The present invention relates to a display device according to the preamble of claim 1.

The invention also relates to a method of manufacturing an above-mentioned device.

STATE OF THE ART

As shown in Figure 1, there is known a device 1 for displaying images superimposed on an image of a surrounding scene, comprising:

- A blade 10 made of a transparent material in the image of the scene, and having two parallel faces, and

- slat 20 reflective or semi-reflective to the images to be superimposed on the image of the scene, and arranged over the entire width of the blade 10 in an inclined manner in the blade 10.

The device 1 allows the transport of images to be superimposed on the image of the scene, the images being derived from a source 2 images. The source 2 may consist of a LCD pixel array or any source of bright image. These images are projected to the infinite and the collimated beam, consisting photographs enters the device 1 through an injection section 3. The beam is then transported to the device over an arbitrary length.

The light beam is guided by the two faces and propagates by total reflection in the blade. If the index of the transparent material forming the blade 10 is greater than those of the media surrounding it, total internal reflections occur naturally since the incident beam of rays is large enough angle with respect to normal incidence to the face of the blade.

The beam then enters the strips 20 at least partially reflective. The slats 20 allow the blade out of the beam to be guided to an eye of a user, for example a foot soldier. The beam is then superimposed on the image of the scene for the user. The previous device has drawbacks, however.

As is readily seen in Figure 1, the strips 20 generate a modulation of the image of the scene, called effect "blind".

WO 01/27685 and US 2007/008624 disclose devices comprising such slats of great length.

PRESENTATION OF THE INVENTION

The invention proposes to overcome at least one of these disadvantages.

For this purpose there is provided according to the invention a device according to claim 1.

The invention is advantageously completed by the features of claims 2 to 8, taken alone or in any technically possible combination.

The invention also relates to a method of manufacturing an above-mentioned device.

The invention has many advantages.

The shutter effect is eliminated or greatly reduced.

Due to the distribution of small platelets throughout the blade, the field seen by the observer's eye is the same as if the eye is placed in the output image source, but the platelets being small and being spread over a large part of the blade, the eye of the observer does not need to pinpoint in space relative to the blade in order to observe the images, unlike the situation of the prior art.

The invention can be applied to many areas and uses, such as image viewing consisting of symbols, information or video images mainly day, without losing contact with the back of the stage so as to facilitate communication or action as part of a mission that may be civilian or military.

The device can obviously be used at night to view video images or superimposed symbols of the scene in direct view or even in addition to the use of night vision binoculars. PRESENTATION OF THE FIGURES

Other features, objects and advantages of the invention will become apparent from the following description, which is purely illustrative and not exhaustive, and should be read in conjunction with the accompanying drawings wherein:

- Figure 1, already discussed, schematically shows a front view of a known device having slat;

- Figure 2 schematically shows a first possible embodiment of a device according to the invention;

- Figure 3 shows schematically a second possible embodiment of a device according to the invention;

- Figures 4 show schematically the main steps of a manufacturing process of a device according to the invention;

- Figure 5 schematically represents the distribution of the platelets according to a guideline in the device according to the invention, and

- Figures 6A to 6C schematically illustrate the definition of a characteristic dimension of a wafer.

Of all the figures, similar elements bear like reference numerals.

DETAILED DESCRIPTION

Figures 2 and 3 schematically show two possible embodiments of a device 1 for displaying five superimposed images to an image 4 of a surrounding scene.

5 The images are from a source 2 images. The source 2 may consist of an LCD pixel array (liquid crystal display) or

OLED (Organic Light Emitting Diode) or any other source of light image.

The images are symbols, information or any video, for the most varied applications.

The source 2 also includes a goal 8 for collimating 5 images.

The device 1 mainly comprises a combination blade 10 made of a transparent material to Image 4 of the stage, and having two faces 1 1 and 12 mutually parallel. An observer 7 can thus see the scene without distortion or magnification across the blade 10.

The device 1 also comprises plates 20 at least semi-reflective images 5 to be superimposed on the image of the scene 4, arranged inclined with respect to the faces 1 1 and 12.

It is understood that if the plates 20 are semitransparent to Image 4, Image 4 of the stage is less attenuated, but images 5 from the source 2 are, however, more strongly attenuated. In the case where the pads 20 are totally reflective, they form micro-mirrors.

The rays 51, 52 and 53 for example, an image component 5, and out of the pupil of the objective 8, propagate in the blade 10 in the manner of a waveguide, that is to say by successive internal reflections. When a radius 51, 52 or 53 encounters a wafer 20, it is reflected and the beam emerging out of the blade 10 with the same angle relative to the optical axis defined by the eye of the observer 7, that at the exit of the goal 8 collimation.

The field seen by the eye of the viewer 7 is the same as if the eye is placed in output Goal 8, but the pads 20 being spread over a large part of the blade 10, the eye 7 the observer does not need to pinpoint in space relative to the blade 10 in order to observe the image 5.

Distribution and size of the plates 20 inside the optical material of the blade 10 are made so as to optimize the quality of the transmitted 5 images.

The platelets 20 have a characteristic dimension, that is to say a largest dimension of each plate 20, which is small compared to a characteristic dimension D of the blade 10, that is to say greater dimension of the blade 10. the plates 20 can have various shapes, such as any shape, square, circular or elliptical. The width and length of each plate 20 are of the same order of magnitude. As shown in Figures 6, it may still define a dimension characteristic of the plates 20, such as the diagonal (Figure 6A), its longest axis in the case of an ellipse (Figure 6B) or diameter, or the longest distance crossing the wafer 20 (Figure 6C), for example. This shows that the characteristic dimension corresponds to the largest dimension of the plate 20, whatever its shape, even irregular.

The characteristic dimension D of the blade 10 is, for example its height in the case of an elongated blade, but preferably its diameter or diagonal (that is to say the largest dimension), and is of the order 10mm, such as 50mm or more.

In all definitions of d, the characteristic dimension of the plates 20 is between 0.1 mm and 5 mm, preferably between 0.5 mm and 2 mm, for easier viewing of the image 4 by the observer 7.

The ratio between the dimension characteristic of platelets 20 and the characteristic dimension D of the blade 10 is between 0.002 and 0.5, preferably between 0.01 and 0.2.

Preferably, the plates 20 are planar and parallel to each other in the blade 10, that shown in Figures 2 and 3.

The platelets 20 can also be non-planar, and have a curvature, so that they can be associated with an optical power. In the case of non-flat plates, the plates 20 may be non-parallel to each other in the blade 10, depending on the desired optical power. In the case of non-flat plates, platelets do not only act as mirrors but participate in the collimator (referred to infinity) of the two source images.

The platelet density surface 20 in the blade 10 is between 20% and 80%, and is preferably of the order of 50%.

From the standpoint of photometry, the source 2 must have sufficient luminance so that after reflection on the pads 20, 5 images provided to the eye of the observer 7 are brighter than the image of the scene 4 view through the blade 10. This depends on the reflection coefficient of the plates 20, as well as their surface relative to that of the blade 10.

Platelet transmission rate 20 may vary according to their position in the blade 10. For example, platelet transmission rate 20 as a function of their localization in the Z-blade 10 may also be uniform or variable.

As shown in Figure 5 to increase the relative surface of the platelets 20 relative to that of the blade 10, the pads 20 are distributed in the blade 10 according to a guideline 13 relative to the faces 1 1 and 12. Platelets then not mask one another vis-à-vis 5-ray image.

The arrangement of the pads 20 may also be arbitrary, that is to say, pseudo-random in blade 10.

Moreover, the distribution plates 20 can also be homogeneous by dimension Z, or vary in a predetermined pattern (more wafers 20 at the bottom of the blade 10 such that the top of the blade 10, or vice versa).

With these parameters, it has space eye placement of the observer 7 defined in Figure 3, for example by:

- X away with respect to the blade 10, corresponding to a pupil drawing, where X is in the range of 10 to 40 mm

- H tolerance on the height of the order of 30 to 60 mm, and

- L of the width, of the order of 20 to 50 mm

which is more important than in the case of the direct use of an eye, giving an ergonomic advantage to the device. The eye area (volume in which the eye sees the image correctly) and allows good visualization of the scene and images even when the 5 short observer for example. This compares with about 10 mm diameter eyepoint offered conventional eyepieces.

Optically, the two embodiments of Figures 2 and 3 are equivalent, and make it possible to adapt according to the final application. In the embodiment of Figure 2, the device further comprises a mirror 6 injection. It is understood that the inclination of the plates 20 relative to the faces 1 1 and 12 depends on the inclination of the source 2 and the mirror 6.

Similarly, the plate 10 may be inclined or parallel to the eye of the viewer 7, depending on the desired applications.

The following discussion relate to a possible implementation of a method of manufacturing an above-mentioned device, with reference to Figures 4.

As shown in Figure 4A, a plurality of pins 100 is placed on one of the faces 1 10 a block 101 made of a transparent optical material moldable to the family of glasses or plastics.

The pins 100 are for example of circular cross-section and have a diameter between 0.5 mm and 2 mm. Other shapes are possible.

As shown in FIG 4B, the pins 100 are then machined, for example by diamond machining, along parallel planes forming a constant angle with the face 1 10 of the block 101 and of h identical or different heights with respect to the face 1 10, so as to mechanically perform the platelet field 20. it is understood that if the pins 100 have a circular cross section, the plates 20 have an elliptical shape.

A thin layer deposit totally or partially reflective, optionally dichroic, is then applied by vacuum deposition techniques commonly used in optics on the pins 100 in order to achieve the pads 20. This must be done by protecting the face 1 10 of the block 101 located at the base of the pins 100 to avoid reducing transmission between the image of the scene and the eye of the observer 7 by the presence of the deposit at this location.

As shown in Figure 4C, the block 101 is then completed by an optically transparent and curable material, preferably cold to prevent damage to the pins 100 (e.g., an adhesive), and very close to the index block material 101 to finish the blade 10 to perform parallel faces 1 1 and 12.

Because the indices of the two materials are very close, there is no Fresnel reflection at the transition and then is obtained a blade with parallel faces 10 with platelets 20 embedded within the material. It is recalled that variant consists in producing either reflective planar platelets but curved to create an optical power. In this case the pads do not only act as mirrors but participate in the collimator (referred to infinity) from the image source. lithography processes known to the skilled possible to give a curvature to platelets 20.

Claims

1. Device (1) image display (5) superimposed on an image (4) of a surrounding scene, comprising
- a blade (10) combination consisting of a transparent material to the image (4) of the stage, and having two faces (1 1, 12) parallel to each other and a greatest dimension (D), and
- platelet (20) at least semi-reflective images (5) superimposed on the image (4) of the stage, disposed obliquely to the faces (1 1, 12) in the blade (10), each plate (20) having a largest dimension (d),
the device being characterized in that the ratio between the largest dimension (d) of the plates (20) and the largest dimension (D) of the blade (10) is between 0.002 and 0.5, so that platelets (20) have a largest dimension (d) smaller relative to a larger dimension (D) of the blade (10).
2. Device (1) according to claim 1, wherein the largest dimension (d) of the plates (20) is between 0.1 mm and 5 mm, preferably between 0.5 mm and 2 mm, the ratio between the largest dimension (d) of the plates (20) and the largest dimension (D) of the blade (10) being between 0.01 and 0.20.
3. Device (1) according to one of claims 1 or 2, wherein the density of platelets (20) surface in the blade (10) is between 20% and
80%, and is preferably of the order of 50%.
4. Device (1) according to one of claims 1 to 3, wherein the plates are plane and mutually parallel.
5. Device (1) according to one of claims 1 to 3, wherein each plate (20) has a curvature.
6. Device (1) according to one of claims 1 to 5, wherein the platelets (20) are distributed in the blade (10) as a guideline (13) relative to the faces (1 1, 12).
7. Device (1) according to one of claims 1 to 6, wherein the platelets of the transmission rate varies according to their position in the blade (10).
8. Device (1) according to one of claims 1 to 7, further comprising a mirror (6) injection.
9. A method of manufacturing a device according to one of claims 1 to 8, characterized in that it comprises the steps of:
- assembling a plurality of pins (100) on one of the faces of a block (101) made from a moldable transparent optical material, the family of glasses or plastics;
- forming the end of the pins (100) so as to produce platelets (20);
- treating the wafers (20) protecting the face (1 10) of the block (101);
- one full block (101) by an optically transparent material and polymerizable very neighbor block index of the material (101) to finish carrying out the blade (10) with parallel faces (1 1, 12).
10. The method of claim 9, further comprising a lithography step to give a curvature to the chips (20).
PCT/EP2010/067428 2009-11-16 2010-11-15 Device for displaying images stacked over an image of a surrounding scene, and associated manufacturing method WO2011058156A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR0958065 2009-11-16
FR0958065A FR2952728B1 (en) 2009-11-16 2009-11-16 superposed image display device has an image of a surrounding scene and manufacturing METHOD

Publications (1)

Publication Number Publication Date
WO2011058156A1 true WO2011058156A1 (en) 2011-05-19

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WO (1) WO2011058156A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936605A (en) * 1972-02-14 1976-02-03 Textron, Inc. Eyeglass mounted visual display
US4099841A (en) * 1976-06-30 1978-07-11 Elliott Brothers (London) Limited Head up displays using optical combiner with three or more partially reflective films
WO1996005533A1 (en) * 1994-08-10 1996-02-22 Lawrence Vandewalle Method and apparatus for direct retinal projection
WO2001027685A2 (en) 1999-10-14 2001-04-19 Stratos Product Development Company Llc Virtual imaging system
US6356392B1 (en) * 1996-10-08 2002-03-12 The Microoptical Corporation Compact image display system for eyeglasses or other head-borne frames
WO2003016032A1 (en) * 2001-08-14 2003-02-27 Essilor International (Compagnie Generale D'optique) Process for moulding a lens having an insert
WO2006085309A1 (en) * 2005-02-10 2006-08-17 Lumus Ltd. Substrate-guided optical device utilizing thin transparent layer
US20070008624A1 (en) 2004-03-12 2007-01-11 Nikon Corporation Optical image display system and image display unit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936605A (en) * 1972-02-14 1976-02-03 Textron, Inc. Eyeglass mounted visual display
US4099841A (en) * 1976-06-30 1978-07-11 Elliott Brothers (London) Limited Head up displays using optical combiner with three or more partially reflective films
WO1996005533A1 (en) * 1994-08-10 1996-02-22 Lawrence Vandewalle Method and apparatus for direct retinal projection
US6356392B1 (en) * 1996-10-08 2002-03-12 The Microoptical Corporation Compact image display system for eyeglasses or other head-borne frames
WO2001027685A2 (en) 1999-10-14 2001-04-19 Stratos Product Development Company Llc Virtual imaging system
WO2003016032A1 (en) * 2001-08-14 2003-02-27 Essilor International (Compagnie Generale D'optique) Process for moulding a lens having an insert
US20070008624A1 (en) 2004-03-12 2007-01-11 Nikon Corporation Optical image display system and image display unit
WO2006085309A1 (en) * 2005-02-10 2006-08-17 Lumus Ltd. Substrate-guided optical device utilizing thin transparent layer

Also Published As

Publication number Publication date
FR2952728A1 (en) 2011-05-20
FR2952728B1 (en) 2012-06-15

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