WO1999031543A1 - Binocular image display apparatus - Google Patents
Binocular image display apparatus Download PDFInfo
- Publication number
- WO1999031543A1 WO1999031543A1 PCT/GB1998/003744 GB9803744W WO9931543A1 WO 1999031543 A1 WO1999031543 A1 WO 1999031543A1 GB 9803744 W GB9803744 W GB 9803744W WO 9931543 A1 WO9931543 A1 WO 9931543A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- display apparatus
- eyepiece
- image
- beamsplitter
- user
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/12—Adjusting pupillary distance of binocular pairs
-
- 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
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
- H04N13/339—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using spatial multiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
- H04N13/344—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] with head-mounted left-right displays
-
- 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
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0132—Head-up displays characterised by optical features comprising binocular systems
- G02B2027/0136—Head-up displays characterised by optical features comprising binocular systems with a single image source for both eyes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/398—Synchronisation thereof; Control thereof
Abstract
Light from an image generator (1) of a head-worn binocular image display apparatus passes through a pair of angled beamsplitters (8a, 8b) to be deflected back towards the latter by a beam deflector, such as a concave mirror (9). The light is then deflected by the beamsplitters (8a, 8b) into left and right paths towards left and right eyepieces (10a, 10b) which enable viewing by a user of the image produced by the generator (1). The left beamsplitter (8a) and the left eyepiece (10a) are rotatable together relative to the image generator (1), while the right beamsplitter (8b) and the right eyepiece (10b) are rotatable together relative to the image generator (1) on the one hand and relative to the left beamsplitter (8a) and the left eyepiece (10a) on the other in order to adjust the interpupillary distance of the users.
Description
BINOCULAR IMAGE DISPLAY APPARATUS
This invention relates to display apparatus of the type which permits of binocular viewing of an image. In particular, it is concerned with display apparatus for viewing video or computer generated information.
In the past, a display apparatus has been developed which incorporates a single display, such as a reflective liquid crystal display, and a beamsplitter arrangement to divide light issuing from the display into two eyepieces.
The beamsplitter arrangement consists of two semi-reflecting beamsplitting elements disposed one above the other and mutually inclined at an angle of substantially 90°. A satisfactory display is achieved by displacing the apparatus relative a reference, such as a casing for the apparatus, sot that the exit pupils produced by the beamsplitter arrangement and subsequent eyepieces are arranged to overlay the user's eyes, so that the user can clearly see the whole field of view.
It is an object of the invention to provide improvements to the above described arrangement. According to the invention, there is provided a display apparatus comprising: a frame for retaining the apparatus in place relative to the head of a user, image generating means for generating an image for viewing by a user,
and an optical system for projecting an image in use to the eyes of a user, the optical system comprising:
beamsplitting means for directing light from an image of the image generating means into left and right paths, the beamsplitting means comprising left and right semi- reflecting devices, said devices being mutually inclined and disposed adjacent one another,
beam deflecting means for projecting light from the image generating means to the beamsplitting means, and
left and right eyepieces for viewing images relayed along the left and right paths respectively, wherein the left semi-reflecting device and the left eyepiece are together rotatable relative to the image generating means, and the right semi-reflecting device and the right eyepiece are together rotatable relative to the image generating means and the left semi-reflecting device and the left eyepiece.
In that way, the distance between the left and right eyepieces can be varied, rendering the apparatus capable of accommodating a wide range of inteφupillary distance of users. By virtue of the above, the apparatus can be adjusted so that small exit pupils are viable, since they can overlay the eyes of a user.
The above provides the potential for less massive and bulky displays, and optical components, and therefore to greater comfort for the user.
In a preferred embodiment of the invention, the left and right semi reflecting devices are disposed substantially horizontally adjacent one another.
According to a prefeired embodiment of the invention, the beam deflecting means comprises a concave mirror.
In a preferred embodiment of the invention, each eyepiece has an optical axis, the optical axes of the eyepieces being substantially parallel with the principal optical axis of the concave mirror.
Preferably, each eyepiece and respective semi reflecting device is rotatable about the principal optical axis of the concave mirror.
Each eyepiece is preferably provided with magnifying/collimating means for magnifying/collimating a relayed image in use for viewing at a respective exit pupil.
The image generating means may comprise a liquid crystal display. Preferably, the liquid crystal display is of the reflective type. The image generating means may further comprise illumination means, including an illumination beamsplitter. Preferably, the illumination beamsplitter is interposed between the liquid crystal display and the beamsplitting means.
As an alternative to a liquid crystal display, the image generating means may comprise an electroluminescent panel.
One or more lenses may be interposed between the image generating means and the concave mirror.
Each eyepiece may comprise one or more lenses. Moreover, the eyepiece may comprise one or more holographic lenses.
The beam deflecting means may include several refracting means, and a reflecting surface.
An exemplary embodiment may include a Mangin mirror.
The beam deflecting means may comprise left and right concave mirrors, each corresponding to respective eyepiece and beamsplitting means.
Further aspects and preferred features of the invention will be apparent from the following description of a specific embodiment of the invention, by way of example only, illustrated in the accompanying drawings, in which:
Figure 1 is a perspective schematic view of the left hand half of a display apparatus in accordance with a specific embodiment of the invention;
Figure 2 is a side elevational view of illumination optics of the display apparatus illustrated in Figure 1 ;
Figure 3 is a front elevational view of the illumination optics of figure 2;
Figure 4 is a raytrace diagram of the part of the display apparatus illustrated in figure 1, in a plane including the principal optical axes of the convex mirror and the left hand eyepiece;
Figure 5 is a raytrace diagram of the complete display apparatus of the specific embodiment, in a plane as indicated in figure 6 by line N-N;
Figure 6 is an end view of the display apparatus of Figure 1, adapted for use by a person having average interpupillary distance;
Figure 7 is an end view of the display apparatus of Figure 1, adapted for use by a person having large interpupillary distance; and
Figure 8 is an end view of the display apparatus of Figure 1, adapted for use by a person having small interpupillary distance.
Referring firstly to Figures 1 and 5, a reflective liquid crystal display (LCD) 6 is provided, adjacent which is a polarising beamsplitter 5 concerned with the illumination of the LCD 6 as described further below. Adjacent the beamsplitter 5 is a field lens 7 and two beamsplitters 8a, 8b, one of which, 8a, is illustrated in figure 1. Adjacent the beamsplitters 8a, 8b is a concave mirror 9. All of the above described components are arranged along a principal optical axis 17 of the concave mirror.
The LCD 6 preferably has an image diagonal in the region of 10mm (0.4"). The illumination optics for use with the LCD, and including the beamsplitter 5 will now be described with reference to figures 2 and 3. As illustrated in figure 2, the polarising beamsplitter 5 includes
two right angle prisms 5a, 5b, having their hypotenuse surfaces adhered together with a polarising thin film coating interposed there between. The beamsplitter is commonly called a "cube", although it may have a rectangular cross section as shown in figures 2 and 3.
A light source 1 , comprising an array of LED's of three colours that are illuminated sequentially, is spaced from the upper surface of the illuminating beamsplitter 5. Between the light source 1 and the beamsplitter 5, a diffuser 2, a Fresnel lens 3 to collimate the light, and a linear polariser 4 are provided, to ensure that the light incident on the LCD 6 is in an appropriate form as to ensure a clear image is generated in the LCD 6. The diffuser 2 may be a moulded plastic or fire polished glass optic with a specular rough surface. The linear polariser 4 may comprise a plastics film, preferably of polyvinylene.
The array of LCD's is triggered by a series of electronic timing signals, corresponding timing signals being sent to the LCD 6, thus allowing the development of a colour image on the LCD 6.
As shown more clearly in figure 5, the beamsplitters 8a, 8b are arranged adjacent one another, and at an angle. The beamsplitters 8a, 8b are relatively thin, and preferably a barrier such as a piece of black plastic is interposed there between so as to eliminate ghost reflections and refractions between the beamsplitters 8a, 8b.
The apparatus further comprises a pair of eyepieces 10a, 10b, of which one is shown in figure 1. Each eyepiece 10a, 10b includes two moulded plastic aspheric lenses 13 a, 13b and 15 a, 15b, and a holographic lens 14a, 14b.
In use, light from the light source 1 passes through the diffuser 2, the Fresnel lens 3 and the linear polariser 4, is reflected off the boundary between the two prisms 5a, 5b of the illuminating beamsplitter 5 to the LCD 6, which causes an image to be generated on the LCD 6.
Light reflected from the LCD 6 then passes back through the beamsplitter 5, generally without being reflected at the boundary due to the polarisation of the light, and through the field lens 7 and the beamsplitters 8a, 8b to the concave mirror 9. The light is then directed back to the beamsplitters 8a, 8b, which reflect the light outwards in two beams towards the eyepieces 10a, 10b. A fold mirror 12a, 12b is provided at the end of each eyepiece 10a, 10b to deflect the beam of light back to the principle optical axis of the eyepiece 10a, 10b, which is substantially parallel with the principal optical axis of the concave mirror 9. The eyepiece serves to project an exit pupil 1 la, 1 lb.
Each eyepiece 10a, 10b, with corresponding fold mirror 12a, 12b and beamsplitter 8a, 8b, are brought together as an eyepiece sub-assembly 16a, 16b. Each eyepiece sub-assembly 16a, 16b is independently rotatable about the principal optical axis 17 of the concave mirror, relative the LCD 6.
Preferably, the sub-assemblies 16a, 16b and a central assembly 18 housing the LCD 6 and the concave mirror 9 are geared together suitably that rotation of the one sub-assembly 16a relative the central assembly 18 is complemented by identical and opposite rotation of the other subassembly 16b relative the central assembly 18, to maintain the perceived orientation of an image developed in the LCD 6.
The optical system is further described in conjunction with the data contained in Tables 1 to 6 appended hereto. Table 1 describes the geometry of the optical surfaces of the components of the display apparatus, table 2 describes the global coordinates of the components, table 3 describes the aspheric nature of certain of the optical components, table 4 describes the properties of the holographic lens 14, table 5 describes refractive indices of materials used in optical components, and table 6 describes the data necessary to generate ray coordinates to trace from the exit pupils to the display.
Note 1 in table 1 refers to the fact that the clear apertures of the plane mirrors and beamsplitters are complex shapes due to the compound rotation of the surfaces in relation to
the field of view and the exit pupils. It will be understood that these clear apertures can be calculated by constracting an optical model from the tabulating data and raytracing across the whole field of view and exit pupil. The intersections of the rays with the plane mirrors and the beamsplitter surfaces will define their clear apertures.
Note 2 in table 1 refers to the fact that the dummy surface is added to the optical model so that the centres of the concave mirror, field lens and the display are modelled on the same axis. It serves to cancel out the mathematical operation of tilting the beamsplitter.
Table 1 describes the optical surfaces of the apparatus by defining a series of surface poles in space, the optical surfaces being define from those poles which are treated as local origins for the surface data. Each optical surface has a shape defined by the radius of curvature and any associated aspheric coefficients. The surface extends over the clear aperture specified.
In table 2, the Cartesian coordinates are measured relative a global origin, taken as the centre of the nominal exit pupil. The X axis is horizontal, being parallel to the modelled optical axis of the concave mirror, the Y axis is vertical, and the Z axis is also horizontal.
The convention used in table 3 is that the aspheric coefficients define a change to the surface sag according to the normal rotationally symmetrical equation. The A4 coefficient (in mm-') adds a term proportional to aperture radius to the power 4, the A6 coefficient (in mm-1) to the power 6, and the A8 coefficient (in mm-1) to the power 8.
Figures 6 to 8 demonstrate how the display assembly can be adjusted to permit use by people with different interpupillary distances.
As an alternative to the foregoing, the concave mirror can readily be replaced by a pair of concave mirrors, each being associated with one of the eyepiece sub-assemblies, m that case, each concave mirror must be arranged to rotate with its respective sub-assembly, for inteφupillary adjustment.
As an alternative to a concave mirror, or a pair of concave mirrors, a combination of refracting and reflecting surfaces may be used, such as a Mangin mirror, i.e. a mirror with internally reflecting surfaces and an external refracting surface. .Another alternative would be a series of one or more lenses in front of a mirror, the lenses projecting the image onto the mirror, which then reflects the image back through the lenses. The lenses may include a holographic lens.
The illumination optics may be constructed as an alternative such that the illumination light is transmitted through the polarising beamsplitter and the displayed image is reflected off the polarising beamsplitter, the combinations of polarising components may be modified by rotating their polarising axes to match the alternate polarising characteristics of the abovedescribed beamsplitter arrangement. Moreover, the above alternative may be combined with the left and right concave mirror arrangement described earlier.
Table 1. Imaging Optics Optical Surface data. Dimensions in millimetres
Table 2. Imaging Optics Global Coordinates of the Surface Poles
Table 3. Aspheric Surface Data. All dimensions in units equivalent to mm
Table 4 Holographic Lens. All dimensions in units equivalent to mm
Holographic fringes on the 2nd Hologram substrate (item 14) Fring profile: kinoform (triangular) with 1 wavelength fringe depth.
Wavelength used for calculation: 0.58756 microns.
+1 diffraction order.
Equivalent lens phase profile is k x p2, where: p is the radius from the surface pole to any point on the hologram k=-0.002243 mm-1
The holographic lens focal length is 222.956mm (converging)
14/2
Table 5. Refractive Index Data
Table 6. Paraxial setup data. All dimensions millimetres
The exit pupils are nominally rectangles with width 14 mm and height 7 mm, centred on the optical axis of the eyepiece lenses.
The field of view is 38 degrees wide and is modelled with an f-tan theta mapping function over a 4:3 aspect ratio. It's height is 28 degrees.
14/3
Claims
1. Display apparatus comprising:
a frame for retaining the apparatus in place relative to the head of a user;
image generating means (1) for generating an image for viewing by the user; and
an optical system for projecting the image in use to the eyes of the user, the optical system comprising:
beamsplitting means (8a, 8b) for directing light from the image generating means (1) into left and right paths, the beamsplitting means comprising left (8a) and right (8b) semi-reflecting devices, said devices being mutually inclined and disposed adjacent to one another,
beam deflecting means (9) for projecting light from the image generating means to the beamsplitting means, and
left (10a) and right (10b) eyepieces for viewing images relayed along the left and right paths respectively,
characterised in that the left semi-reflecting device (8a) and the left eyepiece (10a) are together rotatable relative to the image generating means (1), and the right semi-reflecting device (8b) and the right eyepiece (10b) are together rotatable relative to the image generating means (1) and also relative to the left semi-reflecting device (8a) and the left eyepiece(l╬╕a).
2. Display apparatus as claimed in claim 1, wherein the left and right semi-reflecting devices (8a, 8b) are disposed substantially horizontally adjacent one another.
15
3. Display apparatus as claimed in claim 1 or 2, wherein the beam deflecting means comprises a concave mirror (9).
4. Display apparatus as claimed in claim 3, wherein each eyepiece (lOaJOb) has an optical axis, these optical axes being substantially parallel with the principal optical axis of the concave mirror (9).
5. Display apparatus as claimed in claim 3 or 4, wherein each eyepiece (10a, 10b) and the respective semi-reflecting device (8a,8b) is rotatable about the principal optical axis of the concave mirror (9).
6. Display apparatus as claimed in any preceding claim, wherein each eyepiece (10a, 10b) is provided with magnifying/collimating means for magnifying/collimating a relayed image in use for viewing at a respective exit pupil.
7. Display apparatus as claimed in any preceding claim, wherein the image generating means (1) comprises a liquid crystal display.
8. Display apparatus as claimed in claim 7, wherein the image generating means (1) further comprises illumination means, including an illumination beamsplitter(5).
9. Display apparatus as claimed in claim 8, wherein he illumination beamsplitter (5) is interposed between the liquid crystal display (1) and the beamsplitting means (8a,8b).
10. Display apparatus as claimed in any one of claims 1 to 6, wherein the image generating means (1) comprises an electroluminescent panel.
11. Display apparatus as claimed in claim 3,4 or 5 wherein one or more lenses (7) are inteφosed between the image generating means (1) and the concave mirror (9).
16
12. Display apparatus as claimed in any preceding claim, wherein each eyepiece (lOaJOb) comprises one or more holographic lenses.
13. Display apparatus as claimed in any preceding claim, wherein the beam deflecting means (9) includes refracting means and a reflecting surface, such as a Mangin mirror.
14. Display apparatus as claimed in any of claims 1 to 12, wherein the beam deflecting means (9) comprises left and right concave mirrors, each of which is operative to deflect light from one of the beamsplitter devices (8a,8b) to the respective eyepiece (10a,10b).
15. Display apparatus comprising:
an image generator (1) operative to generate an image for viewing by a user; and an optical system operative to project the image to eyes of the user, the optical system including:
beamsplitting means (8a,8b) comprising first and second beamsplitter devices operative to direct light from the image generator (1) towards the left and right eyes of the user along first and second paths, respectively:
deflecting means (9) disposed optically on the opposite side of the beamsplitting means
(8a,8b) to the image generator (1) and operative to deflect light passing through the beamsplitting means (8a,8b) from the image generator (1) back towards the beamsplitting means (8a,8b) for subsequent deflecting by the latter into said first and second paths; and
left and right eyepieces (lOaJOb) by means of which the user may view the images projected along the first and second paths, respectively;
characterised in that the first beamsplitter device (8a) and the left eyepiece (10a) aie angularly movable in unison relative to the image generator (1) the second beamsplitter
17 device (8b) and the right eyepiece (10b) are angularly movable in unison relative to the image generator (1) and also relative to the first beamsplitter device (8a) and the left eyepiece (10a).
18
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9726413.9 | 1997-12-15 | ||
| GBGB9726413.9A GB9726413D0 (en) | 1997-12-15 | 1997-12-15 | Display apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999031543A1 true WO1999031543A1 (en) | 1999-06-24 |
Family
ID=10823588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1998/003744 WO1999031543A1 (en) | 1997-12-15 | 1998-12-14 | Binocular image display apparatus |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB9726413D0 (en) |
| WO (1) | WO1999031543A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001027684A2 (en) * | 1999-10-09 | 2001-04-19 | Optimize Incorporated | Eyeglass-mount display having personalized fit module |
| WO2005062105A1 (en) * | 2003-12-12 | 2005-07-07 | Headplay, Inc. | Optical arrangements for head mounted displays |
| US6989935B2 (en) | 2002-11-19 | 2006-01-24 | Headplay, Inc. | Optical arrangements for head mounted displays |
| CN110596898A (en) * | 2019-09-29 | 2019-12-20 | 深圳纳德光学有限公司 | One-screen binocular head-mounted display optical system and equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985004961A1 (en) * | 1984-04-16 | 1985-11-07 | Hughes Aircraft Company | Biocular holographic helmet mounted display |
| EP0381449A2 (en) * | 1989-02-01 | 1990-08-08 | Systems Research Laboratories, Inc. | Heads up display for night vision goggle |
| EP0395570A2 (en) * | 1989-04-24 | 1990-10-31 | United Technologies Corporation | Helmet mounted display configured for simulator use |
| EP0579506A1 (en) * | 1992-07-17 | 1994-01-19 | KAISER AEROSPACE & ELECTRONICS CORPORATION | Helmet-mounted biocular display system |
| US5418584A (en) * | 1992-12-31 | 1995-05-23 | Honeywell Inc. | Retroreflective array virtual image projection screen |
-
1997
- 1997-12-15 GB GBGB9726413.9A patent/GB9726413D0/en not_active Ceased
-
1998
- 1998-12-14 WO PCT/GB1998/003744 patent/WO1999031543A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985004961A1 (en) * | 1984-04-16 | 1985-11-07 | Hughes Aircraft Company | Biocular holographic helmet mounted display |
| EP0381449A2 (en) * | 1989-02-01 | 1990-08-08 | Systems Research Laboratories, Inc. | Heads up display for night vision goggle |
| EP0395570A2 (en) * | 1989-04-24 | 1990-10-31 | United Technologies Corporation | Helmet mounted display configured for simulator use |
| EP0579506A1 (en) * | 1992-07-17 | 1994-01-19 | KAISER AEROSPACE & ELECTRONICS CORPORATION | Helmet-mounted biocular display system |
| US5418584A (en) * | 1992-12-31 | 1995-05-23 | Honeywell Inc. | Retroreflective array virtual image projection screen |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001027684A2 (en) * | 1999-10-09 | 2001-04-19 | Optimize Incorporated | Eyeglass-mount display having personalized fit module |
| WO2001027684A3 (en) * | 1999-10-09 | 2001-11-22 | Optimize Inc | Eyeglass-mount display having personalized fit module |
| US6480174B1 (en) | 1999-10-09 | 2002-11-12 | Optimize Incorporated | Eyeglass-mount display having personalized fit module |
| US6989935B2 (en) | 2002-11-19 | 2006-01-24 | Headplay, Inc. | Optical arrangements for head mounted displays |
| US7057824B2 (en) | 2002-11-19 | 2006-06-06 | Headplay, Inc. | Multiple imaging arrangements for head mounted displays |
| US7414792B2 (en) | 2002-11-19 | 2008-08-19 | Headplay (Barbados) Inc. | Method of changing the inter-pupilar distance of a head mounted display while maintaining a constant optical path length |
| US7430078B2 (en) | 2002-11-19 | 2008-09-30 | Headplay (Barbados), Inc. | Multiple imaging arrangements for head mounted displays |
| US7764431B2 (en) | 2002-11-19 | 2010-07-27 | Headplay (Barbados), Inc. | Multiple imaging arrangements for head mounted displays |
| WO2005062105A1 (en) * | 2003-12-12 | 2005-07-07 | Headplay, Inc. | Optical arrangements for head mounted displays |
| CN100437200C (en) * | 2003-12-12 | 2008-11-26 | 海德佩(巴巴多斯)公司 | Optical device for head-wearing display device |
| CN110596898A (en) * | 2019-09-29 | 2019-12-20 | 深圳纳德光学有限公司 | One-screen binocular head-mounted display optical system and equipment |
| CN110596898B (en) * | 2019-09-29 | 2024-03-12 | 深圳纳德光学有限公司 | One-screen binocular head-mounted display optical system and device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9726413D0 (en) | 1998-02-11 |
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