Eye-tracking system using a freeform prism
First Claim
Patent Images
1. A see-through head-mounted display system comprising:
- a freeform prism;
a display device configured to emit display light through the freeform prism to an eye of a user;
an imaging device having an entrance pupil positioned at a back focal plane of the freeform prism to provide object-space telecentric eye tracking, the imaging device configured to receive gaze-detection light reflected from the eye and directed through the freeform prism; and
an illumination prism including a display-facing side, an eye-facing side, a camera-facing side between the display-facing side and the eye-facing side, and an interior beam splitter,wherein the illumination prism is optically intermediate the display device and the freeform prism, optically intermediate the imaging device and the freeform prism, and optically separated from the freeform prism,wherein the illumination prism is positioned to receive, at the display-facing side, the display light from the display device and to transmit the display light through the beam splitter and the eye-facing side to the freeform prism, andwherein the illumination prism is positioned to receive, at the eye-facing side, the gaze-detection light reflected from the eye and through the freeform prism and to reflect the gaze-detection light at the beam splitter through the camera-facing side to the imaging device.
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Abstract
An example see-through head-mounted display system includes a freeform prism and a display device configured to emit display light through the freeform prism to an eye of a user. The see-through head-mounted display system may also include an imaging device having an entrance pupil positioned at a back focal plane of the freeform prism, the imaging device configured to receive gaze-detection light reflected from the eye and directed through the freeform prism.
80 Citations
20 Claims
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1. A see-through head-mounted display system comprising:
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a freeform prism; a display device configured to emit display light through the freeform prism to an eye of a user; an imaging device having an entrance pupil positioned at a back focal plane of the freeform prism to provide object-space telecentric eye tracking, the imaging device configured to receive gaze-detection light reflected from the eye and directed through the freeform prism; and an illumination prism including a display-facing side, an eye-facing side, a camera-facing side between the display-facing side and the eye-facing side, and an interior beam splitter, wherein the illumination prism is optically intermediate the display device and the freeform prism, optically intermediate the imaging device and the freeform prism, and optically separated from the freeform prism, wherein the illumination prism is positioned to receive, at the display-facing side, the display light from the display device and to transmit the display light through the beam splitter and the eye-facing side to the freeform prism, and wherein the illumination prism is positioned to receive, at the eye-facing side, the gaze-detection light reflected from the eye and through the freeform prism and to reflect the gaze-detection light at the beam splitter through the camera-facing side to the imaging device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An eye-tracking system comprising:
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a glint source configured to emit gaze-detection light through a freeform prism to an eye of a user; an imaging device having an entrance pupil positioned at a back focal plane of the freeform prism to provide object-space telecentric eye tracking, the imaging device configured to receive gaze-detection light reflected from the eye and directed through the freeform prism; a display device configured to emit display light through the freeform prism to an eye of a user; and an illumination prism including a beam splitter, the illumination prism positioned to; receive the display light from the display device at a first side and pass the display light to the freeform prism via transmission of the display light through the beam splitter, receive the emitted gaze-detection light from the glint source at a second side and pass the emitted gaze-detection light to the freeform prism via reflection of the gaze-detection light by the beam splitter, and receive, at a third side of the illumination prism, return gaze-detection light comprising the emitted gaze-detection light as reflected from the eye and directed through the freeform prism, reflect, at the beam splitter, the return gaze-detection light through the second side to the imaging device, the second side of the illumination prism being in between and adjacent to each of the first side of the illumination prism and the third side of the illumination prism, the first side of the illumination prism being opposite of the third side of the illumination prism. - View Dependent Claims (15, 16, 17)
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18. A method of performing gaze-detection with a see-through head-mounted display system that is object-space telecentric, the method comprising:
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emitting display light from a display device through a first side of an illumination prism to a freeform prism and then from the freeform prism to an eye of a user, the display device being illuminated via illumination light received at a fourth side of the illumination prism and directed to the display device, the fourth side being adjacent to the first side; receiving gaze-detection light at a back focal plane of the freeform prism, the gaze-detection light being received from a glint source at a second side of the illumination prism, transmitted through a third side of the illumination prism to the eye via the freeform prism, reflected from the eye and directed back through the freeform prism to the third side of the illumination prism, and directed through the second side of the illumination prism to an image sensor, the second side being in between and adjacent to each of the first side of the illumination prism and the third side of the illumination prism, and the second side being opposite of the fourth side of the illumination prism; and determining gaze direction from the gaze-detection light reflected from the eye and directed to the image sensor. - View Dependent Claims (19, 20)
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Specification