BACKGROUND

1. Technical Field

The present invention relates to a display apparatus and a method for controlling the display apparatus.

2. Related Art

There is a known display apparatus that includes a display section worn on a user's head and allows the user to visually recognize an image (see JP-A-2016-149002, for example).

JP-A-2016-149002 discloses an apparatus that produces a plurality of virtual displays arranged in a three-dimensional virtual space, selects one of the virtual displays in accordance with the head's motion detected with a detector, and reproduces a content related to the selected virtual display.

The apparatus disclosed in JP-A-2016-149002 produces the plurality of virtual displays in such a way that they are arranged in the three-dimensional virtual space. When the number of arranged virtual displays increases, it is difficult in some cases for the user to select a virtual display on which a content that the user desires to view is displayed. Further, in a case where the plurality of virtual displays are arranged in front of the user, contents displayed in front of the user could undesirably block the user's visual field and hence hamper the user's operation. Moreover, in the case of a display apparatus worn on the user's head, since a displayed image lowers the visibility of an outside scene in some cases, it is difficult in some cases for the user to operate an operation section of the display apparatus.

SUMMARY

An advantage of some aspects of the invention is to allow a user to readily select a content to be displayed and change the display state of the content through simple operation.

An aspect of the invention is directed to a display apparatus including a display section that is worn on a user's head, a detection section that detects at least one of a position and a motion of a detection target section including the head, a reference setting section that sets a reference state based on at least one of the position and motion of the detection target section detected by the detection section, and a display controlling section that changes display states of contents displayed by the display section based on changes in the position and motion of the detection target section with respect to the position and motion of the detection target section in the reference state, and the display controlling section changes the display states of the contents displayed by the display section in such a way that relative display positions of a plurality of the contents are maintained.

According to the configuration described above, the reference state can be set on the basis of at least one of the position and motion of the detection target section, and the display states of the plurality of contents can be changed on the basis of changes in the position and motion of the detection target section with respect to those in the set reference state. Further, when the display states of the contents are changed, they can be so changed that the relative display positions of the plurality of contents are maintained. Therefore, a content to be displayed can be readily selected, and the display state of the content can be changed through simple operation.

In the aspect of the invention, the display apparatus may further include a storage section that stores display position information representing the relative display positions of a plurality of the contents, and the display controlling section may change the display states of the contents in such a way that the relative display positions of a plurality of the contents represented by the display position information are maintained.

According to the aspect of the invention with this configuration, the display states of the contents displayed by the display section can be so changed that the relative display positions of the plurality of contents are maintained.

In the aspect of the invention, the display controlling section may select one of the contents based on changes in the position and motion of the detection target section with respect to the position and motion of the detection target section in the reference state and cause the display section to display the selected content.

According to the aspect of the invention with this configuration, a content can be selected on the basis of the amounts of changes in the position and motion of the detection target section, and the selected content can be displayed. A content can therefore be selected by the position or motion of the head, whereby a content can be readily selected.

In the aspect of the invention, the reference setting section may set, as the reference state, an axis of rotation of the detection target section and the position of the detection target section that rotates around the axis of rotation, and the display controlling section may be capable of setting the display positions of the contents along a rotational direction around the axis of rotation and along a direction perpendicular to the rotational direction.

According to the aspect of the invention with this configuration, the plurality of contents can be so set that the relative display positions of the plurality of contents are maintained.

In the aspect of the invention, the display controlling section may be capable of setting the display position of any of the contents on a rear side of the detection target section in the reference state.

According to the aspect of the invention with this configuration, the display positions of the contents can be changed in a variety of manners.

In the aspect of the invention, the display controlling section may be capable of setting the display positions of the contents in positions where the user is allowed to visually recognize a plurality of the contents arranged on a spherical surface around a point on the axis of rotation or in a plane separate from the axis of rotation by a predetermined distance.

According to the aspect of the invention with this configuration, the plurality of contents are set in positions where the user can visually recognize the contents arranged on a spherical surface around a point on the axis of rotation or in a plane separate from the axis of rotation by a predetermined distance. The display states of the plurality of contents can therefore be so changed that the relative display positions of the contents are maintained.

In the aspect of the invention, the display controlling section may be capable of setting the display position of any of the contents in a position where the user is allowed to visually recognize the content disposed in a plane containing the user's feet.

According to the aspect of the invention with this configuration, the user can visually recognize the content disposed in the plane containing the user's feet.

In the aspect of the invention, the display section may include a right display section that allows the user's right eye to visually recognize an image and a left display section that allows the user's left eye to visually recognize an image, and the display controlling section may cause any of the contents to be displayed with parallax present between the right display section and the left display section.

According to the aspect of the invention with this configuration, any of the contents can be displayed with parallax present between the right display section and the left display section. The content can therefore be displayed in a three-dimensional manner.

In the aspect of the invention, the reference setting section may set the reference state in accordance with a position or a motion of a pointing element.

According to the aspect of the invention with this configuration, the reference state can be set in accordance with the position or motion of the pointing element. The reference state can therefore be readily set.

In the aspect of the invention, the display controlling section may set a display magnification of any of the contents in the display section in accordance with the position or motion of the pointing element.

According to the aspect of the invention with this configuration, the display magnification of any of the contents can be set in accordance with the position or motion of the pointing element. The display magnification of the content can therefore be set through simple operation.

In the aspect of the invention, the display controlling section may cause the display section to display a content for input used for input operation performed on any of the contents.

According to the aspect of the invention with this configuration, the display section displays the content for input. Input operation can therefore be performed on the content via the content for input.

In the aspect of the invention, the reference setting section may set, when the reference setting section determines that the detection target section has been stationary for at least a predetermined period, the position of the stationary detection target section as the reference state.

According to the aspect of the invention with this configuration, when it is determined that the detection target section has been stationary for at least a predetermined period, the position of the stationary detection target section is set as the reference state. The reference state will therefore not be set in a position where the user does not intend.

In the aspect of the invention, the display apparatus may further include a sightline detection section that detects orientations of the user's sightlines, and the reference setting section may set the reference state including the position or motion of the detection target section and the orientations of the sightlines detected by the sightline detection section.

According to the aspect of the invention with this configuration, the reference state can be set on the basis of the position or motion of the detection target section and the orientations of the sightlines detected by the sightline detection section. The reference state can therefore be set in more detail in correspondence with the user's state.

In the aspect of the invention, the detection section may be disposed in an enclosure of the display section and include at least any of a GPS detection section that performs position detection based on GPS signals, an acceleration sensor that detects acceleration, an angular acceleration sensor that detects angular acceleration, a monocular camera, a stereocamera, and a magnetic sensor.

According to the aspect of the invention with this configuration, the detection section can detect the position or motion of the detection target section with precision.

In the aspect of the invention, the magnetic sensor may be disposed on a side facing an outer surface of the enclosure of the display section.

According to the aspect of the invention with this configuration, the influence of the enclosure on the magnetism detection performed by the magnetic sensor can be reduced.

In the aspect of the invention, the display apparatus may further include a processing section that performs a plurality of functions, and each of the contents corresponds to the functions performed by the processing section.

According to the aspect of the invention with this configuration, a content corresponding to the functions performed by the processing section can be displayed by the display section.

In the aspect of the invention, the display apparatus may further include an editing processing section that changes a substance of any of the contents displayed by the display section.

According to the aspect of the invention with this configuration, the editing processing section can change the substance of any of the contents.

In the aspect of the invention, the display controlling section may cause a plurality of the contents displayed by the display section to be displayed in a form of thumbnail images based on the amounts of changes in the position and motion of the detection target section with respect to the amounts of changes in the position and motion of the detection target section in the reference state.

According to the aspect of the invention with this configuration, the plurality of contents displayed by the display section can be displayed in the form of thumbnail images. The user can therefore readily grasp the contents displayed by the display section.

In the aspect of the invention, the display controlling section may predict changes in the position and motion of the detection target section with respect to the position and motion of the detection target section in the reference state and change the display state of any of the contents in accordance with a result of the prediction.

According to the aspect of the invention with this configuration, the display state of any of the contents can be changed in accordance with a result of the prediction of changes in the position and motion of the detection target section. The contents displayed by the display section can therefore be displayed in a plurality of positions. The display state of any of the contents can therefore be changed at an early timing.

In the aspect of the invention, the display controlling section may cause the display section to display a plurality of the contents in such a way that the plurality of contents are arranged in different positions in a direction extending from a near side toward a far side with respect to the detection target section.

According to the aspect of the invention with this configuration, the plurality of contents are arranged in different positions in the direction extending from the near side toward the far side with respect to the detection target section. The contents displayed by the display section can therefore be displayed in a plurality of positions.

Another aspect of the invention is directed to a method for controlling a display apparatus including a display section that is worn on a user's head, the method including a detecting step of detecting at least one of a position and a motion of a detection target section including the head, a setting step of setting a reference state based on at least one of the position and motion of the detection target section detected in the detecting step, and a changing step of changing display states of contents displayed by the display section based on changes in the position and motion of the detection target section with respect to the position and motion of the detection target section in the reference state, and the display states of the contents displayed by the display section are so changed that relative display positions of a plurality of the contents are maintained.

According to the configuration described above, the reference state can be set on the basis of at least one of the position and motion of the detection target section, and the display states of the contents can be changed on the basis of changes in the position and motion of the detection target section with respect to those in the set reference state. Further, when the display states of the contents are changed, they can be so changed that the relative display positions of the contents are maintained. Therefore, a content to be displayed can be readily selected, and the display state of the content can be changed through simple operation.

