Wearable devices

Abstract

To provide a wearable head-up display which allows for convenient and safe stowage when not in use.SOLUTION: A hinge component is positioned within an optical path from an image projector to a display component, thereby ensuring optical alignment for projection. A detection means is provided to signal when the wearable device is in a folded position in order to deactivate the projector.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to wearable head-up displays. [Background technology]

[0002] A heads-up display overlays a projected image onto a person's real-world field of view so that both the real-world image and the projected image are perceived. A heads-up display utilizes a transparent component that the user looks through and projects an image to appear in the user's field of view.

[0003] The transparency can be a fixed component, such as a clear screen on an aircraft, or can be worn by the user. Military applications of wearable head-up displays have utilized helmet visors as the transparency, but this is inconvenient for non-military applications, and even for certain military applications. Devices with much smaller transparency components worn like eyeglasses have been provided, but still result in devices large enough that the light source and optical projection components, such as optics, prevent the device from folding.

[0004] Therefore, there is a need for a wearable head-up display that is compact when worn and when folded. Summary of the Invention

[0005] Aspects and embodiments of the present invention provide a display as set out in the accompanying claims.

[0006] According to one aspect of the present invention, there is provided a wearable head-up display comprising an arm supporting an image projection means and a frame supporting a combiner assembly, the frame being hingedly attached to the arm such that the combiner assembly is positioned to receive light output by the image projection means when the hinge is in a deployed position.

[0007] Optionally, the image projection means comprises a light source and a microdisplay, the microdisplay being illuminated by the light source to output image-bearing light.

[0008] Optionally, the frame may be hingedly attached to the arm at a location between the collimation optics and the combiner assembly. Advantageously, this allows convenient folding of the display and therefore easy storage and portability.

[0009] Optionally, the combiner assembly may comprise an output waveguide, which advantageously allows for direction of the image-bearing light.

[0010] Optionally, the combiner assembly may comprise a prism, which advantageously allows for directing the image-bearing light.

[0011] Optionally, the combiner assembly may comprise a diffraction grating, which advantageously allows for directing the image-bearing light.

[0012] Optionally, the combiner assembly may comprise a mirror array, which advantageously allows for directing the image-bearing light.

[0013] Optionally, the combiner assembly is positioned to direct the received light towards the user's eye, which advantageously allows for an image to be overlaid onto the user's real-world field of view.

[0014] Optionally, a locking mechanism is further provided for holding the wearable head-up display in the deployed position. The locking mechanism may comprise a magnetic or resistance-based clip. Advantageously, this allows the display to remain in the deployed position, for example while the display is being worn.

[0015] Optionally, the image projection means may be arranged to stop outputting light when the hinge is not in the extended position. Advantageously, this allows eye safety protocols to be observed, such as preventing harmful light from being output when the display is in the extended position. Furthermore, this may allow power savings when the display is folded and not in use.

[0016] Optionally, the image projection means may be arranged to output image-bearing light onto the surface when the hinge is in the folded position. Advantageously, this allows for alternative ways of viewing the image.

[0017] Optionally, the arm may be arranged to be foldable in a plane passing through the optical axis of the image projection means. Advantageously, this allows convenient folding of the display and therefore easy storage and portability.

[0018] Optionally, the image projection means may comprise a processing device for receiving and processing data indicative of the image produced by the image-bearing light. Advantageously, this allows for the display of computer-driven images. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 shows a block diagram of the components of a head-up display. [Figure 2] FIG. 2 shows a schematic diagram of a head-up display. [Figure 3] FIG. 3 shows the paraxial optical configuration. [Figure 4] FIG. 4 shows an example flow chart of the operation. DETAILED DESCRIPTION OF THE INVENTION

[0020] Head-up displays utilize an optical projection device to project light containing image content into or onto a transparent component, which then directs this light toward the user's eyes at the required location. Typically, the projection device comprises a light source such as an LED or laser diode, an imaging device such as a DMD, LCD, LCOS, or OLED panel, and collimation optics that project the light into or onto the transparent component. To achieve the required brightness and optical quality, these components are of considerable size. In the example of a wearable head-up display, these components are integrated into an assembly intended to be worn by the user.

[0021] To provide proper positioning and stability for the optical source and collimation optics, these components have traditionally been formed in a rigid structure with a transparent component oriented toward the user's face and head. This provides rigidity to ensure a comfortable fit and ensure accurate optical alignment and, therefore, image quality. Such an arrangement also addresses safety concerns, as the light source may be intense enough to cause eye damage if viewed directly rather than through the correct optical alignment. However, the resulting device is rigid, bulky, and cannot be conveniently folded like traditional eyeglasses.

[0022] 1 shows a block diagram of the components of a wearable head-up display 100 that can be folded to a convenient size for storage. The image projection means 110 comprises a microdisplay 112 and a light source 111 for outputting image-bearing light. The light source 111 is arranged to illuminate the microdisplay 112. The image projection means 110 may further comprise collimation optics 113 for directing the output image-bearing light. The collimation optics 113 may comprise one or more lenses. The collimation optics 113 is arranged to produce substantially collimated image-bearing light from the microdisplay. Other image projection means may be utilized as appropriate.

[0023] The image projection means 110 is configured to output light to a combiner assembly 120. The combiner assembly 120 is configured to be positioned in front of a user's eyes 123 and to direct the light so that an image is overlaid on the user's field of view in the real world. The combiner assembly 120 may include a prism 121 configured to couple the light into an output waveguide 122. The prism 121 is located after a hinge surface 130 about which the image projection means 110 may rotate through the use of a hinge mechanism. The use of the prism 121 advantageously allows for efficient routing of the projected light directly to the output waveguide 122. This may have several advantages. First, the projected light may be routed in a direction that is off-axis with respect to the optical axis of the preceding collimation optics 113, thereby allowing the head-up display system to be designed into a spatial volume that is more conformal to the arc shape of the user's 124 head and therefore more comfortable and aesthetically pleasing. Second, prism 121 ensures that the optical path length between image projection means 110 and combiner assembly 120 is minimized when the rotating hinge mechanism is introduced near hinge plane 130, thus making wearable head-up display 100 more compact. Third, the surface of the prism may include refractive power, and thus prism 121 will form part of collimation optics 113, thus reducing the number of elements required for collimation optics 113 and making wearable head-up display 100 more compact.

[0024] The combiner assembly 120 may include any components that provide the functionality to direct light from the image projection means 110 to the user's eye as needed. For example, mirrors and / or diffraction gratings may be utilized in conjunction with waveguide elements.

[0025] FIG. 2 shows a schematic diagram of a head-up display device 200 incorporating the optical components of FIG. 1. The device 200 comprises a front frame 201 configured like conventional eyeglasses and two arms 202, 203. The frame 201 is arranged to support the combiner assembly 120, and the arm 202 is arranged to support the image projection means 110. The frame 201 may further be arranged to support at least a portion of the combiner assembly 120 in front of the user's line of sight so that image-bearing light may be directed toward the user's eyes. The arm 202 is hingedly attached to the frame 201 in a conventional manner; i.e., the arm 202 is arranged to rotate about the frame 201 about an attachment point or joint 204 such that the device 200 can be folded similar to conventional eyeglasses with the arm rotated 90 degrees about the joint 204. When in the folded position, the frame 201 and arm 202 of the device 200 are folded about joint 204 to allow for easy storage and portability. Similarly, when in the unfolded position, the frame 201 and arm 202 of the device will be OPENED about joint 204 to achieve a position suitable for wearing the device by a user. The arm 202 may be hingedly attached to the frame 201 at a position between the image projection means 110 and the combiner assembly 120. As indicated by dashed line 130, the folding of the arm 202 occurs in a plane passing through the optical axis of the image projection means 110 to project an image onto the combiner assembly 120.

[0026] The joint 204 must be sufficiently rigid when in the deployed state to ensure that the image is properly projected onto the combiner assembly 120. A locking mechanism may be disposed in the joint 204 to hold the arm 202 in the deployed operational position, preventing it from moving or folding at the hinge. For example, a magnetic or resistance-based clip may be utilized.

[0027] Figure 3 shows a paraxial optical design 300 that facilitates the arrangements of Figures 1 and 2. Hinge surface 130 is located between the final lens 310 of collimation optics 103 and prism 104. Transparent covers 320, 330, e.g., glass, are placed over the collimation optics and prism inputs to seal these areas and provide appropriate environmental sealing. Hinge surface 130 may also be placed at other locations within optical system 300 to provide the required folded and unfolded states.

[0028] When the device of Figures 1-3 is folded, light projected by the image projection means 110 may be emitted from the head-up display. To provide a safety system, the image projection means 110 may be arranged to automatically turn off and stop projecting light when the joint 204 is not in a fully deployed state or when the device is stowed. For example, as shown in Figure 4, a detection means, e.g., a switch, may be provided in association with the hinge arrangement to indicate whether the glasses are folded or stowed. When the arm 202 moves away from the locked or deployed position, the image projection means 110 is deactivated.

[0029] When in the folded state, the optical device 200 can be used with additional optical components to project an image onto a surface such as a wall or screen. The additional optical components can send a signal to the image projection means 110 to enable projection of the image (e.g., by engaging a switch connected to the hinge).

[0030] The devices described herein may be provided with an electronic system for receiving data indicative of the image to be projected, for example, a processing device for receiving the data via a wired or wireless connection and processing the data for the image projection apparatus.

[0031] Although the present invention has been described in connection with several embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the scope of the present invention is limited only by the appended claims. Additionally, while features may appear to be described in connection with particular embodiments, those skilled in the art will recognize that various features of the described embodiments may be combined in accordance with the present invention. In the claims, the term "comprising" does not exclude the presence of other elements or steps.

[0032] Furthermore, the order of features in the claims does not imply any particular order in which the features must be performed, and in particular the order of individual steps in method claims does not imply that the steps must be performed in that order. Rather, steps may be performed in any suitable order. In addition, singular references do not exclude pluralities. Thus, references to "A," "AN," "first," "second," etc. do not exclude pluralities. In the claims, the terms "comprising" or "including" do not exclude the presence of other elements. The following is a summary of the claims as originally filed: [C1] A wearable head-up display, an arm (202) supporting an image projection means (110) for outputting image-bearing light; a frame (201) supporting a combiner assembly (120), wherein the frame is hingedly attached to the arm (202) such that the combiner assembly (120) is positioned to receive the light output by the image projection means (110) when the hinge is in an extended position; A display comprising: [C2] The display of C1, wherein the image projection means (110) comprises a light source and a microdisplay (112) arranged such that the microdisplay is illuminated by the light source (111) to output the image-bearing light. [C3] A display according to C1 or C2, wherein the image projection means (110) comprises at least one collimation optic (113) for directing the output image-bearing light. [C4] The display of C3, wherein the frame (201) is hingedly attached to the arm (202) at a position between the collimation optics (113) and the combiner assembly (120). [C5] A display described in any one of C1 to C4, wherein the combiner assembly (120) comprises one or more of an output waveguide (122), a prism (121), a diffraction grating, and a mirror array for directing the received light. [C6] The display of any one of C1 to C5, wherein the combiner assembly (120) is positioned to direct the received light towards a user's eye. [C7] The display of any one of C1 to C6, comprising a locking mechanism for holding the wearable head-up display in the deployed position. [C8] The display of C7, wherein the locking mechanism comprises a magnetic or resistance-based clip. [C9] The display of any one of C1 to C8, wherein the image projection means (110) is arranged to stop outputting light when the hinge is not in the extended position. [C10] A display according to any one of C1 to C8, wherein the image projection means (110) is arranged to output the image-bearing light onto a surface when the hinge is in a folded position. [C11] The display according to any one of C1 to C10, wherein the arm (202) is arranged so as to be foldable in a plane passing through the optical axis of the image projection means (110). [C12] A display according to any one of C1 to C11, wherein the image projection means (110) comprises a processing device for receiving and processing data indicative of the image produced by the image-bearing light.

Claims

1. A wearable display, an arm supporting an image projector configured to output image-bearing light; a combiner assembly configured to receive the image-bearing light and overlay it onto a real-world view of a user of the wearable display; a frame supporting the combiner assembly, the frame hingedly attached to the arm such that when a hinge located between the arm and the frame is in an extended position, the combiner assembly is positioned and optically coupled to receive the image-bearing light output by an image projector; a collimation optic that projects the image-bearing light onto a transparent element within the combiner assembly through which the user views the image-bearing light and the real-world view, the two surfaces that come into contact upon rotation of the hinge being located between the collimation optic and the combiner assembly; and A wearable display comprising:

2. The wearable display of claim 1 , wherein the image projector is configured to project the image-bearing light outside the wearable display when the hinge is in a folded position.

3. The image projector includes: A light source and a microdisplay, the microdisplay being positioned to be illuminated by the light source. The wearable display of claim 1 .

4. The wearable display of claim 1 , wherein the collimation optics direct the image-bearing light.

5. The wearable display of claim 1 , wherein the combiner assembly includes at least one optical device selected from an output waveguide and a prism, the output waveguide and the prism controlling the direction of the image-bearing light.

6. The wearable display of claim 1 , wherein the combiner assembly includes at least one optical device selected from a mirror array and a diffraction grating to control the direction of the image-bearing light.

7. 10. The wearable display of claim 1, wherein the image projector further comprises a processing device configured to receive data and convert the received data into an image to form at least a portion of the image-bearing light.

8. The wearable display of claim 7 , wherein the processing device is configured to display computer-driven images.

9. The wearable display of claim 1 , wherein the wearable display is a head-up display.

10. A wearable head-up display, an arm supporting an image projector configured to output image-bearing light; a combiner assembly configured to receive the image-bearing light and overlay it on a real-world field of view of a user of the wearable head-up display, the combiner assembly being at least partially positioned within a line of sight of the user when the wearable head-up display is in use; and a frame supporting the combiner assembly, the frame hingedly attached to the arm such that the combiner assembly is positioned to receive the image-bearing light output by the image projector, the image projector configured to project the image-bearing light outside the wearable head-up display when a hinge located between the arm and the frame is in a folded position; and A wearable head-up display comprising:

11. 11. The wearable head-up display of claim 10, further comprising collimation optics that, when the hinge is in an extended position, projects the image-bearing light onto a transparent component within the combiner assembly through which the user views the image-bearing light and the real-world view.

12. A wearable head-up display as described in claim 11, wherein the two surfaces that come into contact upon rotation of the hinge are located between the collimation optical component and the combiner assembly.

13. 12. The wearable head-up display of claim 11, wherein the combiner assembly includes at least one optical device selected from an output waveguide, a prism, a mirror array, and a diffraction grating, and the output waveguide, the prism, the mirror array, and the diffraction grating control the direction of the image-bearing light.

14. The wearable head-up display of claim 13 , wherein the prism enables the image-bearing light to be routed in a direction that is off-axis relative to an optical axis of the collimation optics.

15. 11. The wearable head-up display of claim 10, wherein the image projector further comprises a processing device configured to receive data and convert the received data into an image to form at least a portion of the image-bearing light.

16. The wearable head-up display of claim 1 , wherein the image projector is configured to stop outputting light when the hinge is in a folded position.

17. A wearable head-up display, an image projector configured to output image-bearing light; a first arm and a second arm, one of the first arm and the second arm configured to support the image projector; a combiner assembly configured to receive the image-bearing light and to overlay it on a real-world field of view of a user of the wearable head-up display; and a frame supporting the combiner assembly, the frame being hingedly attached to the first arm and the second arm such that the combiner assembly is positioned to receive the image-bearing light output by the image projector when a hinge coupled between the image projector and the combiner assembly is in an extended position, the image projector being configured to project the image-bearing light out of the wearable head-up display when the hinge is in a folded position; and A wearable head-up display comprising:

18. 20. The wearable head-up display of claim 17, wherein the image projector further comprises a processing device configured to receive data and convert the received data into an image to form at least a portion of the image-bearing light.

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