# US 2023/0054450 A1 · Retinal projection display system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0054450 A1 - Document ID: US20230054450A1 - Status: Published application - Kind: A1 - Application number: 17/820,876 - Filed: 2022-08-18 - Published: 2023-02-23 - Earliest claimed: 2021-08-20 - Assignees: InvenSense, Inc. - Applicants: InvenSense, Inc. - Inventors: Ardalan HESHMATI; Hideaki FUKUZAWA - Web page: https://patentgrep.com/patent/US20230054450A1 ## CPC - G02B 27/0172: {characterised by optical features} - G02B 26/101: {with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129)} - G02B 27/0093: {with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking} - G02B 27/0179: {Display position adjusting means not related to the information to be displayed} - G02B 2027/0138: {comprising image capture systems, e.g. camera} - G02B 2027/014: {comprising information/image processing systems} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - G02B 2027/0181: {Adaptation to the pilot/driver} - G02B 2027/0187: {slaved to motion of at least a part of the body of the user, e.g. head, eye} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A retinal projection display system includes a light source for projecting an image, a scanning mirror having a field of view larger than the image, and a reflective surface on which the image is projected, wherein the reflective surface is larger than the image. The scanning mirror projects the image onto a viewable region of the reflective surface such that the image is projected into a retina of a user. ## Claims ### Claim 1 A retinal projection display system comprising: a light source for projecting an image; a scanning mirror having a field of view larger than the image; and a reflective surface on which the image is projected, wherein the reflective surface is larger than the image; wherein the scanning mirror projects the image onto a viewable region of the reflective surface such that the image is projected into a retina of a user. ### Claim 2 (depends on 1) The retinal projection display system of claim 1, wherein a pupillary distance alignment is determined during a calibration operation for the user, wherein the pupillary distance alignment identifies the viewable region of the reflective surface for a known gaze direction of the user. ### Claim 3 (depends on 2) The retinal projection display system of claim 2, wherein the image is displayed at multiple locations of the reflective surface during the calibration operation, and the pupillary distance alignment is determined responsive to feedback from the user identifying the viewable region of the reflective surface. ### Claim 4 (depends on 2) The retinal projection display system of claim 2, further comprising: a gaze tracker for tracking a gaze direction of the user, wherein the viewable region corresponds to the gaze direction; wherein the scanning mirror is configured to dynamically move the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user. ### Claim 5 (depends on 4) The retinal projection display system of claim 4, wherein the scanning mirror is configured to dynamically move the image on the reflective surface according to the gaze direction of the user responsive to the gaze direction satisfying a movement threshold. ### Claim 6 (depends on 4) The retinal projection display system of claim 4, wherein the scanning mirror is configured to dynamically move the image on the reflective surface according to the gaze direction of the user after a predetermined time delay. ### Claim 7 (depends on 4) The retinal projection display system of claim 4, wherein the image is smaller than the viewable region such that scanning mirror is configured to dynamically move the image on the reflective surface according to the gaze direction of the user responsive to image moving outside of the viewable region. ### Claim 8 (depends on 1) The retinal projection display system of claim 1, wherein a scanning range of the scanning mirror is dynamically adjusted to correspond to a size of the image in the viewable region. ### Claim 9 (depends on 1) The retinal projection display system of claim 1, wherein a scanning range of the scanning mirror corresponds to a size of a display area of the reflective surface, such that the light source is activated for displaying the image only when the scanning mirror is projecting the image in the viewable region. ### Claim 10 (depends on 1) The retinal projection display system of claim 1, wherein the reflective surface is at least partially transparent. ### Claim 11 (depends on 1) The retinal projection display system of claim 1, further comprising: an eyeglasses frame configured to be worn by the user; and at least one lens mounted in the eyeglasses frame, where the reflective surface is positioned on at least a portion of the at least one lens. ### Claim 12 A method of retinal projection, the method comprising: projecting an image from a light source onto a reflective surface using a scanning mirror having a field of view larger than the image, wherein the reflective surface is larger than the image; determining a viewable region of the reflective surface for a user; and directing the image onto the viewable region of the reflective surface such that the image is projected into a retina of the user. ### Claim 13 (depends on 12) The method of claim 12, wherein the determining the viewable region of the reflective surface of the user comprises: retrieving a pupillary distance alignment for the user, wherein the pupillary distance alignment identifies the viewable region of the reflective surface for a known gaze direction of the user. ### Claim 14 (depends on 13) The method of claim 13, wherein the pupillary distance alignment is determined during a calibration operation for the user, the method further comprising: during the calibration operation: projecting an alignment image onto the reflective surface; moving the alignment image across a display area of the reflective surface; and responsive to feedback from the user, determining the pupillary distance alignment identifying the viewable region of the reflective surface for the known gaze direction of the user. ### Claim 15 (depends on 13) The method of claim 13, wherein the determining the viewable region of the reflective surface of the user further comprises: tracking a gaze direction of the user, wherein the viewable region corresponds to the gaze direction. ### Claim 16 (depends on 15) The method of claim 15, wherein the directing the image onto the viewable region of the reflective surface such that the image is projected into a retina of the user comprises: dynamically moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user using the scanning mirror. ### Claim 17 (depends on 16) The method of claim 16, wherein the dynamically moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user using the scanning mirror comprises: determining an amount of movement of the gaze direction based on the tracking the gaze direction of the user; and responsive to the amount of movement of the gaze direction satisfying a movement threshold, moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user. ### Claim 18 (depends on 16) The method of claim 16, wherein the dynamically moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user using the scanning mirror comprises: moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user after a predetermined time delay. ### Claim 19 (depends on 16) The method of claim 16, wherein the image is smaller than the viewable region and wherein the dynamically moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user using the scanning mirror comprises: determining whether the image is outside of the viewable region; and responsive to determining that the image is outside of the viewable region, moving the image on the reflective surface according to the gaze direction of the user and the pupillary distance alignment of the user. ### Claim 20 (depends on 12) The method of claim 12, wherein a scanning range of the scanning mirror is dynamically adjusted to correspond to a size of the image in the viewable region. ### Claim 21 (depends on 12) The method of claim 12, wherein a scanning range of the scanning mirror corresponds to a size of display area of the reflective surface, such that the light source is activated for displaying the image only when the scanning mirror is projecting the image in the viewable region. ### Claim 22 (depends on 12) The method of claim 12, wherein the reflective surface is at least partially transparent.