# US 2021/0344893 A1 · Image display device, image display system, and movable body

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- Number: US 2021/0344893 A1
- Document ID: US20210344893A1
- Status: Published application
- Kind: A1
- Application number: 17/284,214
- Filed: 2019-10-23
- Published: 2021-11-04
- Earliest claimed: 2018-10-31
- Assignees: KYOCERA Corporation
- Applicants: KYOCERA Corporation
- Inventors: Kaoru KUSAFUKA
- Web page: https://patentgrep.com/patent/US20210344893A1

## CPC

- G09G 3/003: {to produce spatial visual effects}
- H04N 13/31: using parallax barriers
- G02B 27/0093: {with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking}
- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- G02B 30/31: involving active parallax barriers (involving directional light or back-light sources G02B30/33)
- G09G 5/10: Intensity circuits
- H04N 13/315: the parallax barriers being time-variant
- H04N 13/383: for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes
- B60K 35/10: Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor
- B60K 35/235: with means for detecting the driver's gaze direction or eye points
- G02B 2027/0134: {of stereoscopic type}
- G09G 2320/0626: for control of overall brightness
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES

## Abstract

An image display device includes a display panel, a barrier panel, a light projecting unit, and a controller. The display panel is configured so as to include a first display region. The barrier panel is configured so as to include a first barrier region. The light projecting unit is configured so as to include a first light emitting region. The controller is configured so that a portion located in the first display region is displayed as one parallax image frame including two subframes, and configured so that a light quantity of light emitted from the first light emitting region is reduced during a frame change period including a timing of changing display from the parallax image frame to a new parallax image frame.

## Claims

### Claim 1

An image display device, comprising:
a light projecting unit comprising a plurality of light emitting elements;
a display panel which is located so as to receive light from the light projecting unit and is configured so as to display a plurality of frames;
a barrier panel configured so as to overlap the display panel and include a plurality of light transmitting portions and a plurality of dimming portions; and
a controller configured so as to control the light projecting unit, the display panel, and the barrier panel,
a traveling direction of at least part of image light emitted from the display panel being divided for a right eye and a left eye of a user, by the plurality of light transmitting portions and the plurality of dimming portions,
the display panel being configured so as to include a first display region, and
to display a right-eye image which is viewed by the right eye of the user, in a right-eye visible region of the first display region, and a left-eye image which is viewed by the left eye of the user, in a left-eye visible region of the first display region,
the barrier panel being configured so as to include a first barrier region corresponding to the first display region, and
configured so that the plurality of light transmitting portions and the plurality of dimming portions are formed in the first barrier region so that the right-eye visible region and the left-eye visible region are at different positions of the first display region,
the light projecting unit being configured so as to include a first light emitting region corresponding to the first display region,
the controller being configured so that, in a case where two consecutive frames are displayed, a portion located in the first display region is displayed as one parallax image frame including a first subframe and a second subframe,
configured so as to control, for each parallax image frame, display of a parallax image in the first display region and formation of the plurality of light transmitting portions and the plurality of dimming portions in the first barrier region so that an image displayed in each of the first subframe and the second subframe included in the one parallax image frame is combined and viewed as one parallax image by the user, and
configured so that a light quantity of light emitted from the first light emitting region is reduced during a frame change period which includes a timing of changing display from the parallax image frame to a new parallax image frame.

### Claim 2 (depends on 1)

The image display device according to claim 1, wherein
the controller is configured so that, in a case where the second subframe is displayed following the first subframe in the first display region, positions of the right-eye visible region and the left-eye visible region in the second subframe are determined based on respective positions of the right-eye visible region and the left-eye visible region in the first subframe, and
the controller is configured so that, in a case where the first subframe is displayed following the second subframe in the first display region, positions of the right-eye visible region and the left-eye visible region in the second subframe are determined, not based on respective positions of the right-eye visible region and the left-eye visible region in the second subframe displayed immediately before, but based on an eye-position of the eyes of the user.

### Claim 3 (depends on 1)

The image display device according to claim 1, wherein
the display panel is configured so as to further include a second display region which displays a planar image which is viewed by both eyes of the user,
the light projecting unit is configured so as to further include a second light emitting region corresponding to the second display region,
the barrier panel is configured so as to further include a second barrier region corresponding to the second display region, and
the barrier panel is configured so that the plurality of light transmitting portions and the plurality of dimming portions are formed in the second barrier region in accordance with the planar image displayed in the second display region,
the controller is configured so that, in a case where the two consecutive frames are displayed, a portion located in the second display region is displayed as two planar image frames,
configured so as to control, for each planar image frame, display of the planar image in the second display region and formation of the plurality of light transmitting portions and the plurality of dimming portions in the second barrier region, and
configured so that a frame rate of a subframe included in the parallax image frame and a frame rate of the planar image frame are a same, and
the controller is configured so that a light quantity in the second light emitting region is reduced, but a light quantity in the first light emitting region is not reduced during a subframe change period which includes a timing of changing display from the first subframe to the second subframe in the first display region.

### Claim 4 (depends on 3)

The image display device according to claim 3, wherein
the controller is configured so that a light quantity of light emitted from the first light emitting region is made different from a light quantity of light emitted from the second light emitting region.

### Claim 5 (depends on 4)

The image display device according to claim 4, wherein
the controller is configured so that the light quantity of light emitted from the first light emitting region is made greater than the light quantity of light emitted from the second light emitting region.

### Claim 6 (depends on 5)

The image display device according to claim 5, wherein
the controller is configured so that the light quantity of light emitted from the first light emitting region is made close to twice the light quantity of light emitted from the second light emitting region.

### Claim 7 (depends on 4)

The image display device according to claim 4, wherein
the controller is configured so that the light quantity of light emitted from the second light emitting region is made greater than the light quantity of light emitted from the first light emitting region.

### Claim 8 (depends on 3)

The image display device according to claim 3, wherein
the display panel is configured so as to include a black display region in at least a part of the second display region, and
the controller is configured so that a light quantity of light emitted from a region corresponding to the black display region in the second light emitting region is reduced.

### Claim 9 (depends on 3)

The image display device according to claim 3, wherein
the display panel is configured so as to include a black display region in at least a part of the second display region, and
the controller is configured so that the plurality of dimming portions in a region corresponding to the black display region in the second barrier region are formed in the barrier panel.

### Claim 10 (depends on 9)

The image display device according to claim 9, wherein
the controller is configured so as to control, for each planar image frame, formation of the plurality of light transmitting portions and the plurality of dimming portions in the second barrier region, based on the eye-position of the eye of the user.

### Claim 11 (depends on 1)

The image display device according to claim 1, wherein
the right-eye image comprises a first sub-right-eye image displayed in the first subframe and a second sub-right-eye image displayed in the second subframe,
the left-eye image comprises a first sub-left-eye image which is displayed in the first subframe and does not overlap with the first sub-right-eye image and a second sub-left-eye image which is displayed in the second subframe and does not overlap with the second sub-right-eye image, and
the controller is configured so that the second sub-left-eye image is displayed in a region where the first sub-right-eye image is displayed at a timing of changing display from the first subframe to the second subframe, and
configured so that the second sub-right-eye image is displayed in a region where the first sub-left-eye image was displayed.

### Claim 12 (depends on 1)

The image display device according to claim 1, wherein
the display panel is configured so as to include a third display region,
the light projecting unit is configured so as to include a third light emitting region corresponding to the third display region, and
the controller is configured so that a light quantity of light emitted from the third light emitting region is reduced and transmittance in the third display region is increased.

### Claim 13 (depends on 1)

The image display device according to claim 1, wherein
the controller comprises a first controller which controls the display panel, a second controller which controls the barrier panel, and a third controller which controls the light projecting unit, and
the first controller and at least one of the second controller and the third controller are configured so as to synchronize each other.

### Claim 14

An image display system, comprising:
an image display device comprising
a light projecting unit comprising a plurality of light emitting elements;
a display panel which is located so as to receive light from the light projecting unit and is configured so as to display a plurality of frames;
a barrier panel configured so as to overlap the display panel and include a plurality of light transmitting portions and a plurality of dimming portions; and
a controller configured so as to control the light projecting unit, the display panel, and the barrier panel; and
a reflective member,
a traveling direction of at least part of image light emitted from the display panel being divided for a right eye and a left eye of a user, by the plurality of light transmitting portions and the plurality of dimming portions,
the display panel being configured so as to include a first display region, and
to display a right-eye image which is viewed by the right eye of the user, in a right-eye visible region of the first display region, and a left-eye image which is viewed by the left eye of the user, in a left-eye visible region of the first display region,
the barrier panel being configured so as to include a first barrier region corresponding to the first display region, and
configured so that the plurality of light transmitting portions and the plurality of dimming portions are formed in the first barrier region so that the right-eye visible region and the left-eye visible region are at different positions of the first display region,
the light projecting unit being configured so as to include a first light emitting region corresponding to the first display region,
the controller being configured so that, in a case where two consecutive frames are displayed, a portion located in the first display region is displayed as one parallax image frame including a first subframe and a second subframe,
configured so as to control, for each parallax image frame, display of a parallax image in the first display region and formation of the plurality of light transmitting portions and the plurality of dimming portions in the first barrier region so that an image displayed in each of the first subframe and the second subframe included in the one parallax image frame is combined and viewed as one parallax image by the user, and
configured so that a light quantity of light emitted from the first light emitting region is reduced during a frame change period which includes a timing of changing display from the parallax image frame to a new parallax image frame,
the reflective member reflecting the image light and causing the image light to reach the left eye and the right eye of the user.

### Claim 15

A movable body, comprising:
an image display system mounted on the movable body, comprising
an image display device comprising
a light projecting unit comprising a plurality of light emitting elements;
a display panel which is located so as to receive light from the light projecting unit and is configured so as to display a plurality of frames;
a barrier panel configured so as to overlap the display panel and include a plurality of light transmitting portions and a plurality of dimming portions; and
a controller configured so as to control the light projecting unit, the display panel, and the barrier panel; and
a reflective member,
a traveling direction of at least part of image light emitted from the display panel being divided for a right eye and a left eye of a user, by the plurality of light transmitting portions and the plurality of dimming portions,
the display panel being configured so as to include a first display region, and
to display a right-eye image which is viewed by the right eye of the user, in a right-eye visible region of the first display region, and a left-eye image which is viewed by the left eye of the user, in a left-eye visible region of the first display region,
the barrier panel being configured so as to include a first barrier region corresponding to the first display region, and
configured so that the plurality of light transmitting portions and the plurality of dimming portions are formed in the first barrier region so that the right-eye visible region and the left-eye visible region are at different positions of the first display region,
the light projecting unit being configured so as to include a first light emitting region corresponding to the first display region,
the controller being configured so that, in a case where two consecutive frames are displayed, a portion located in the first display region is displayed as one parallax image frame including a first subframe and a second subframe,
configured so as to control, for each parallax image frame, display of a parallax image in the first display region and formation of the plurality of light transmitting portions and the plurality of dimming portions in the first barrier region so that an image displayed in each of the first subframe and the second subframe included in the one parallax image frame is combined and viewed as one parallax image by the user, and
configured so that a light quantity of light emitted from the first light emitting region is reduced during a frame change period which includes a timing of changing display from the parallax image frame to a new parallax image frame,
the reflective member reflecting the image light and causing the image light to reach the left eye and the right eye of the user.