CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Japanese Patent Application No. 2018-205972 (filed on Oct. 31, 2018), the contents of which are incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to an image display device, an image display system, and a movable body.

BACKGROUND

In a related art, there is known an image display device which projects a parallax image to both eyes of a user by an active barrier to provide stereoscopic vision. The number of effective pixels of the parallax image projected on the left and right eyes of the user is less than half the number of effective pixels of a display panel. Here, there is known a configuration which increases the number of effective pixels of the parallax image by driving the active barrier so that images projected on the left and right eyes of the user are exchanged between even-numbered frames and odd-numbered frames displayed in one set. This technique is described, for example, in the following paper: Ayuki Hayashishita, Hideki Kakeya, “Time-Division Multiplexing Parallax Barrier with Sub-Subpixel Phase Shift”, SID2018DIGEST, P-88, 1515-1518.

SUMMARY

An image display device according to an embodiment of the disclosure includes a light projecting unit, a display panel, a barrier panel, and a controller. The light projecting unit includes a plurality of light emitting elements. The display panel is located so as to receive light from the light projecting unit and is configured so as to display a plurality of frames. The barrier panel is configured so as to overlap the display panel and include a plurality of light transmitting portions and a plurality of dimming portions. A traveling direction of at least part of image light emitted from the display panel is 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 controller is configured so as to control the light projecting unit, the display panel, and the barrier panel. The display panel is configured so as to include a first display region and a second display region. The display panel is configured so as 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. The display panel is configured so as to display 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 is configured so as to include a first barrier region corresponding to the first display region. The barrier panel is 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 is configured so as to include a first light emitting region corresponding to the first display region. The controller is 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. The controller is configured so as to control the display panel and the barrier panel 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. The controller is configured so as to control, for each parallax image frame, display of the parallax image in the first display region and formation of the light transmitting portions and the dimming portions in the first barrier region. The controller is 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.

An image display system according to another embodiment of the disclosure includes an image display device and a reflective member. The image display device includes a light projecting unit, a display panel, a barrier panel, and a controller. The light projecting unit includes a plurality of light emitting elements. The display panel is located so as to receive light from the light projecting unit and is configured so as to display a plurality of frames. The barrier panel is configured so as to overlap the display panel and include a plurality of light transmitting portions and a plurality of dimming portions. A traveling direction of at least part of image light emitted from the display panel is 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 controller is configured so as to control the light projecting unit, the display panel, and the barrier panel. The display panel is configured so as to include a first display region and a second display region. The display panel is configured so as 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. The display panel is configured so as to display 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 is configured so as to include a first barrier region corresponding to the first display region. The barrier panel is 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 is configured so as to include a first light emitting region corresponding to the first display region. The controller is 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. The controller is configured so as to control the display panel and the barrier panel 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. The controller is configured so as to control, for each parallax image frame, display of the parallax image in the first display region and formation of the light transmitting portions and the dimming portions in the first barrier region. The controller is 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 reflects the image light and causes the image light to reach the left eye and the right eye of the user.

A movable body according to still another embodiment of the disclosure is equipped with an image display system. The image display system includes an image display device and a reflective member. The image display device includes a light projecting unit, a display panel, a barrier panel, and a controller. The light projecting unit includes a plurality of light emitting elements. The display panel is located so as to receive light from the light projecting unit and is configured so as to display a plurality of frames. The barrier panel is configured so as to overlap the display panel and include a plurality of light transmitting portions and a plurality of dimming portions. A traveling direction of at least part of image light emitted from the display panel is divided for a right eye user and a left eye of a user, by the plurality of light transmitting portions and the plurality of dimming portions. The controller is configured so as to control the light projecting unit, the display panel, and the barrier panel. The display panel is configured so as to include a first display region and a second display region. The display panel is configured so as 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. The display panel is configured so as to display 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 is configured so as to include a first barrier region corresponding to the first display region. The barrier panel is configured so that the light transmitting portions and the 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 is configured so as to include a first light emitting region corresponding to the first display region. The controller is 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. The controller is configured so as to control the display panel and the barrier panel 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. The controller is configured so as to control, for each parallax image frame, display of the parallax image in the first display region and formation of the light transmitting portions and the dimming portions in the first barrier region. The controller is 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. The reflective member reflects the image light and causes the image light to reach the left eye and the right eye of the user.

