# US 11,451,762 B2 · Head-mounted viewable device and eye-tracking system for use in head-mounted viewable device

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- Number: US 11,451,762 B2
- Document ID: US11451762B2
- Status: Granted
- Kind: B2
- Application number: 17/266,978
- Filed: 2019-04-29
- Published: 2021-10-07
- Granted: 2022-09-20
- Earliest claimed: 2018-08-20
- Assignees: Yuyao Sunny Optical Intelligence Technology Co., Ltd.
- Applicants: Yuyao Sunny Optical Intelligence Technology Co., Ltd.
- Inventors: Kouwen Zhang; Meishan Guo; Litong Song; Wei Tang; Jian Xie
- Web page: https://patentgrep.com/patent/US11451762B2

## CPC

- G02B 27/0172: {characterised by optical features}
- H04N 13/344: with head-mounted left-right displays
- G02B 3/04: with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses}
- G02B 25/001: {Eyepieces}
- G02B 27/0093: {with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking}
- G06F 3/011: {Arrangements for interaction with the human body, e.g. for user immersion in virtual reality (blind teaching G09B21/00)}
- G06F 3/013: {Eye tracking input arrangements (G06F3/015 takes precedence)}
- H04N 13/383: for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A head-mounted viewable device includes a display configured to display and project a virtual scene image to a user's eye, a VR optical lens configured to construct an optical path between the display and the user's eye for allowing a virtual scene image being observed by the user's eye, and an eye-tracking system configured to detect a sight direction of the user's eye and adjust a display position of the virtual scene image based on the detected sight direction. The eye-tracking system includes at least one light source configured to project the detection light and a receiving module configured to receive the reflected detection light reflected to determine the sight direction of the user's eye. The receiving module is positioned at a side of the VR optical lens and arranged to face towards the user's eye such that the detection light reflected by the user's eye is directly received by the receiving module.

## Claims

### Claim 1

A head-mounted viewable device, comprising:
a display configured for displaying and projecting a virtual scene image to at least one eyeball of the user who is wearing said head-mounted viewable device;
a VR (Virtual Reality) optical lens configured to form an optical path between said display and the one or more eyeballs of the user for allowing said virtual scene image being displayed at and projected from said display to reach the eyeball of the user through said VR optical lens; and
an eye-tracking system configured to detect a sight direction of the eyeball of the user and adjust a display position of said virtual scene image at said display according to said detected sight direction, wherein said eye-tracking system comprises:
at least one light source configured to project a detection light to the one or more eyeballs of the user; and
a receiving module configured to receive said detection light reflected by the eyeball of the user so as to detect said sight direction of the eyeball of the user, wherein said receiving module is positioned at a side of said VR optical lens for facing towards the eyeball of the user, such that said detection light reflected by the eyeball of the user is directly received by said receiving module, wherein said receiving module comprises an optical lens unit and a photosensitive element, wherein said optical lens unit comprises at least one optical lens configured for receiving said detection light reflected by the eyeball of the user, wherein a plane defined by said photosensitive element and a plane defined by said at least one optical lens have an including angle defined therebetween, wherein said including angle between said plane defined by said photosensitive element and said plane defined by said at least one optical lens is determined based on an included angle defined between an object optical axis defined by the eyeball of the user and a detecting optical axis defined by said receiving module, as well as optical parameters of said at least one optical lens, wherein said included angle between the object optical axis defined by the eyeball of the user and the detecting optical axis defined by said receiving module is determined based on a distance between the eyeball of the user and said VR optical lens, a predetermined diameter of the respective eyeball of the user, and a distance between said VR optical lens and said receiving module, wherein said included angle between the object optical axis defined by the eyeball of the user and the imaging optical axis defined by said receiving module is ranged 25.0° to 40.0°.

### Claim 2 (depends on 1)

The head-mounted viewable device, as recited in claim 1, wherein said included angle between the object optical axis defined by the eyeball of the user and the detecting optical axis defined by said receiving module is 32°.

### Claim 3 (depends on 2)

The head-mounted viewable device, as recited in claim 2, wherein said including angel between said plane defined by said photosensitive element and said plane defined by said at least one optical lens is 20°.

### Claim 4 (depends on 1)

The head-mounted viewable device, as recited in claim 1, wherein said at least one optical lens is a single piece aspheric optical lens.

### Claim 5 (depends on 4)

The head-mounted viewable device, as recited in claim 4, wherein said eye-tracking system is integrally configured with said optical VR lens that said VR optical lens and said eye-tracking system have an integral structure.

### Claim 6 (depends on 4)

The head-mounted viewable device, as recited in claim 4, wherein said at least one light source comprises eight light sources peripherally provided along said peripheral edge of said VR optical lens for projecting said detection light to the eyeball of the user.

### Claim 7 (depends on 6)

The head-mounted viewable device, as recited in claim 6, wherein each of said light sources comprises multiple optical fibers and a non-visible light source communicating with said optical fibers in such a manner that when said non-visible light source is activated, each of said optical fibers projects said detection light.

### Claim 8 (depends on 3)

The head-mounted viewable device, as recited in claim 3, wherein said display is movable relative to said VR optical lens so as to adjust a diopter of the eyeball of the user by adjusting a distance between said display and said VR optical lens.

### Claim 9

An eye-tracking system for a head-mounted viewable device for a user to wear, comprising:
at least one light source configured for projecting a detection light to at least an eyeball of the user who is wearing the head-mounted viewable device; and
a receiving module configured to receive said detection light reflected by the eyeball of the user so as to determine said sight direction of the eyeball of the user, wherein said receiving module is positioned at a side of a VR optical lens of the head-mounted viewable device for facing towards the eyeball of the user such that said detection light reflected by the eyeball of the user is directly received by said receiving module, wherein said receiving module comprises an optical lens unit and a photosensitive element, wherein said optical lens unit comprises at least one optical lens for receiving said detection light reflected by the eyeball of the user, and a plane defined by said photosensitive element and a plane defined by said at least one optical lens have an including angle defined therebetween, wherein said including angle between said plane defined by said photosensitive element and said plane defined by said at least one optical lens is determined based on an included angle defined between an object optical axis defined by the eyeball of the user and a detecting optical axis defined by said receiving module, as well as optical parameters of said at least one optical lens, wherein said included angle between the object optical axis defined by the eyeball of the user and the detecting optical axis defined by said receiving module is determined based on a distance between the eyeball of the user and the VR optical lens, a predetermined diameter of the eyeball of the user, and a distance between the VR optical lens and said receiving module, wherein said included angle between the object optical axis defined by the eyeball of the user and the detecting optical axis defined by said receiving module is 32° and said including angle between said plane defined by said photosensitive element and said plane defined by said at least one optical lens is 20°.