The described invention relates to optical channels, and more particularly to controlling the color space across the output grating of an optical exit pupil expander such as may be disposed in a head-wearable imaging device/computer that projects an image directly in front of a user's eye.
Certain wearable computers such as those embodied as eyeglasses or virtual technology goggles project an image directly in front of a user's eye. In eyeglass type devices these projections are see-through so the user can see the projected data in the near field while the visual real-world in the far field remains largely unobscured. In virtual reality devices the user is isolated from perceiving the real world so the display needs to fill the user's entire field of vision. One challenge with such wearable displays is to produce an adequate eye-box in which the viewer can view the data that is projected by the micro-display. Such an the eye-box for see-through displays measures about 10-12 mm in the vertical and in the horizontal and the eye relief is in the range of 20-30 mm. For virtual reality devices the eye box is necessarily larger and often the eye relief is a bit longer. Retinal scanning display devices project the image directly on the user's retina so the eye-box is smaller and the eye relief is closer to zero. Due to the nature of such wearable devices the space constraints limit the reach of the optics and so one challenge is to keep that eye-box from shrinking to only a few mm, given the optical train (often located at the side of the user's head for see-through displays) is limited by practical limits to the size of such wearable devices. These size limits to the optical train also adversely affect the color space seen by the user. Color space may be a peripheral matter for see through displays where only data is being displayed but is critical for virtual reality devices whose effectiveness relies on the display persuading a certain level of the user's consciousness that the scene represents more than only a virtual world.
The exit pupil expander (EPE) is the optical component that would replace the geometric optics that have traditionally been used to expand the size of the eye-box in head-wearable visual devices. In optics the exit pupil is a virtual aperture in that only rays which pass through this virtual aperture can exit the system. The exit pupil is the image of the aperture stop in the optics that follow it. The term exit pupil is sometimes also used to refer to the diameter of the virtual aperture. Unlike the optics of conventional cameras or telescopes, an exit pupil expander of a wearable virtual reality or see-through device is designed to display for near-distance viewing.
Numerical aperture expander is a less common term sometimes used with reference to retinal scanning displays which project an image through the pupil directly on the user's retina. The numerical aperture of the light emanating from display pixels determines the exit pupil size, and retinal scanning displays project a rastered image about the size of the user's eye pupil at an intermediate plane. Retinal scanning displays can be used for virtual reality applications.
Diffractive exit pupil expanders have diffraction gratings that pose an inherent problem in controlling the color space. Because of diffraction the input and output gratings diffract different color bands of light into different output angles. This results in the user's perception of the color space of the scene being displayed having a varying color balance across the user's field of view.
Conventional exit pupil expanders typically have a very high degree of parallelism which
According to a first aspect of these teachings there is an optical channel comprising an entrance pupil enabling light to enter the optical channel, an exit pupil enabling the light to exit the optical channel, a back surface adjacent to the entrance pupil, and a front surface opposite the back surface. In this particular aspect the optical channel is geometrically configured such that the light defining a center wavelength that enters the optical channel at the entrance pupil perpendicular to the back surface experiences angularly varying total internal reflection between the front and back surfaces such that the light that exits the optical channel perpendicular to the exit pupil is at a wavelength shifted from the center wavelength.
According to a second aspect of these teachings there is an optical channel comprising an entrance pupil enabling light to enter the optical channel, an exit pupil enabling the light to exit the optical channel, a back surface adjacent to the entrance pupil, and a front surface opposite the back surface. In this particular aspect the optical channel is configured such that a first distance at the entrance pupil between the front surface and the back surface is different from a second distance at the exit pupil between the front surface and the back surface.
According to a third aspect of these teachings there is a head-wearable imaging device comprising a micro display and an exit pupil expander. The head-wearable imaging device may for example be a virtual reality device or an augmented reality device. In either case the exit pupil expander comprises: an entrance pupil configured to in-couple light from the micro-display; an exit pupil configured to out-couple light from the exit pupil expander; a back surface adjacent to the entrance pupil; and a front surface opposite the back surface. In this embodiment, as with the optical channel of the first aspect, the exit pupil expander is geometrically configured such that the light defining a center wavelength that enters the optical channel at the entrance pupil perpendicular to the back surface experiences angularly varying total internal reflection between the front and back surfaces such that the light that exits the optical channel perpendicular to the exit pupil is at a wavelength shifted from the center wavelength. In another embodiment the exit pupil expander may be as described above for the optical channel according to the second aspect of these teachings.
Certain non-limiting embodiments of these teachings provide a wedge-shaped EPE (exit pupil expander) plate for controlling color space as generally shown at
More particularly, the light reflecting off these surfaces 204, 210 propagating inside the wedge-shaped EPE 200 by TIR experiences a varying degree of angular variation, as a result of the non-parallelism of the surfaces/plates 204, 210. This affects the angular spread of the out-coupled light that exits the EPE 200 through the front surface 210 at the output grating 208. In particular, if light-emitting diodes (LEDs) are used as light sources (the incident light 202) for the optical engine providing the image, the user will see the resulting angular shift as a color change of the light source because the diffracted light is shifted from the dominant or from the central-emitted wavelength of the LED. The light that is coupled in with a slightly different wavelength is indicated by dashed arrows in
The optical channel/EPE 200 of
Consider this distinction between
This is also shown in
The basic wedge-shaped EPE 200 is only one of several EPE designs that will produce a color shift in the out-coupled light according to these teachings. While the
Similar color-shifting advantages can be realized with one or more segmented wedge-shapes intermediate between the input and output of the EPE in which case the input and output surfaces at which the input and output gratings are disposed can be parallel themselves, as shown by example at
It is known to incorporate into the design of an EPE intermediate vertical expansion gratings, which in
While the embodiments illustrated herein show non-parallel planar surfaces similar advantages can be gained where one or both of such surfaces are curved. The result is qualitatively similar in that the color expansion arises from the non-parallelism of these opposed reflective surfaces but the computations are more extensive to realize a practical EPE as compared to planar non-parallel surfaces.
In the
One particular technical effect of embodiments of these teachings is an improved color space provided by augmented reality and virtual reality viewing devices, and at a reduced cost. Such augmented reality or virtual reality devices would need to be designed such that the characteristics of the diffraction gratings take into account the wedge angle α but this would be an engineering matter more than compensated by volume sales of these retail end user devices.
Certain of the above embodiments may be described in part by its functionality as an optical channel (the EPE) comprising an entrance pupil enabling light to enter the optical channel; an exit pupil enabling the light to exit the optical channel; a back surface 204 adjacent to the entrance pupil; and a front surface 210 opposite the back surface. In the drawings the entrance pupil is designated by the input grating 206 and the exit pupil is designated by the output grating 208; while typical embodiments will have such gratings at those entrance and exit pupils the gratings themselves are not an essential part of the novel aspects of the optical channel/EPE presented herein. As detailed more particularly above the optical channel/EPE is geometrically configured, that is its shape is designed, such that the light defining a center wavelength that enters the optical channel at the entrance pupil perpendicular to the back surface experiences angularly varying total internal reflection between the front and back surfaces such that the light that exits the optical channel perpendicular to the exit pupil is at a wavelength shifted from the center wavelength. The dashed lines exiting the output grating 208 are perpendicular, and
Further to the aspects of the invention demonstrated by
In the described embodiments the optical channel is geometrically configured such that the front surface and the back surface are non-parallel. While flat non-parallel surfaces are shown curved surfaces can also be employed to take advantage of these teachings. In the specific embodiment of
Another embodiment shown particularly at
Alternatively, certain embodiments of these teachings may be described by the channel's geometry and without functional terms. For example, such an optical channel 200 comprises an entrance pupil enabling light 202 to enter the optical channel; an exit pupil enabling the light to exit the optical channel; a back surface 204 adjacent to the entrance pupil; and a front surface 210 opposite the back surface. As above, the drawings depict the entrance pupil as the input grating 206 and the exit pupil as the output grating 208, and such gratings may be common to most implementations but are not essential, particularly the output grating is not needed if the host device is of the retinal scanning variety. In this way of describing the invention the optical channel is configured such that a first distance 220 at the entrance pupil between the front surface 210 and the back surface 204 is different from a second distance 222 at the exit pupil between the front surface 210 and the back surface 204.
In one such embodiment such as that shown at
Though the
The
The embodiment detailed with respect to
Embodiments of these teachings include the overall host device in which such an optical channel/EPE may be deployed. Such a host device is shown by example at
The various embodiments presented herein provide a fuller appreciation for the scope of the teachings herein, but these are examples and do not themselves represent an inherent limit to the various types of embodiments that can exploit the teachings herein, whether such embodiments relate to the EPE itself or as to how it may be disposed on or within a host device.
This is a continuation of U.S. patent application Ser. No. 16/748,193, filed on Jan. 21, 2020, which is a continuation of U.S. patent application Ser. No. 15/659,732, filed on Jul. 26, 2017, now U.S. Pat. No. 10,578,870, all of which are incorporated herein by reference in their entirety.
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Number | Date | Country | |
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20230131587 A1 | Apr 2023 | US |
Number | Date | Country | |
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Parent | 16748193 | Jan 2020 | US |
Child | 18145416 | US | |
Parent | 15659732 | Jul 2017 | US |
Child | 16748193 | US |