# US 10,481,686 B2 · Image display device for changing focal point and convergence of display image

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- Number: US 10,481,686 B2
- Document ID: US10481686B2
- Status: Granted
- Kind: B2
- Application number: 15/924,900
- Filed: 2018-03-19
- Published: 2018-10-04
- Granted: 2019-11-19
- Earliest claimed: 2017-03-29
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Akira Komatsu; Takashi Takeda; Toshiaki Miyao; Masayuki Takagi
- Web page: https://patentgrep.com/patent/US10481686B2

## CPC

- G06F 3/013: {Eye tracking input arrangements (G06F3/015 takes precedence)}
- G02B 27/0172: {characterised by optical features}
- G02B 27/0955: {Lenses (lenses per se G02B3/00)}
- H04N 5/74: Projection arrangements for image reproduction, e.g. using eidophor
- H04N 13/344: with head-mounted left-right displays
- G02B 13/14: for use with infrared or ultraviolet radiation ({G02B13/008, } G02B13/16 take precedence)
- G02B 2027/0138: {comprising image capture systems, e.g. camera}
- G02B 2027/0159: {with mechanical means other than scaning means for positioning the whole image}
- G02B 2027/0185: {Displaying image at variable distance}
- H04N 13/332: Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An image display device includes: an image display section that displays an image for a user and allows the user to visually recognize external light; a line-of-sight direction and distance detecting section that detects a line-of-sight direction of the user and a distance to an object located in the line-of-sight direction; and a display control section that controls display operation of the image display section. The image display section includes a focal point and convergence changing section that changes a convergence and a focal point of a display image to be projected. The display control section controls the focal point and convergence changing section based on the line-of-sight direction and the distance to the object detected by the line-of-sight direction and distance detecting section.

## Claims

### Claim 1

An image display device comprising:
an image display section that displays an image for a user and allows the user to visually recognize external light; and
a line-of-sight direction and distance detecting section that detects a line-of-sight direction of the user and a distance to an object located in the line-of-sight direction, wherein:
the image display section changes a convergence and a focal point of a display image to be projected by using a movable optical member, and
the focal point and the convergence of the display image to be projected are changed based on the line-of-sight direction and the distance to the object detected by the line-of-sight direction and distance detecting section.

### Claim 2 (depends on 1)

The image display device according to claim 1, wherein
the convergence and the focal point of the display image to be projected are adjusted based on an angle of convergence obtained from the line-of-sight direction and the distance to the object detected by the line-of-sight direction and distance detecting section.

### Claim 3 (depends on 2)

The image display device according to claim 2, wherein
the movable optical member changes the convergence and the focal point, in conjunction with each other, of the display image to be projected, in a predetermined relationship.

### Claim 4 (depends on 3)

The image display device according to claim 3, wherein
the movable optical member is asymmetrically disposed with respect to a projection optical axis of a projection optical system for displaying an image for the user, is driven so as to change a power of the movable optical member, and changes the convergence and the focal point of the display image to be projected with a change in the power.

### Claim 5 (depends on 4)

The image display device according to claim 4, wherein:
the movable optical member includes a pair of lenses,
the pair of lenses each include a concave portion and a convex portion; and
the movable optical member adjusts the focal point and the convergence by moving at least one of the pair of lenses in a horizontal direction intersecting an optical axis.

### Claim 6 (depends on 4)

The image display device according to claim 4, wherein
the movable optical member changes its lens shape based on an amount of a liquid contained therein.

### Claim 7 (depends on 4)

The image display device according to claim 4, wherein
the movable optical member deforms a boundary between two kinds of liquids having different specific gravities with an electric field applied to the liquids.

### Claim 8 (depends on 1)

The image display device according to claim 1, wherein
the line-of-sight direction and distance detecting section detects a distance to an object within a range of a predetermined field of view with respect to the detected line-of-sight direction.