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Provided is a head-mounted display apparatus including: a display unit configured to display each of virtual screens that is set to each of a plurality of predetermined focal lengths; a distance-specific image generation unit configured to generate distance-specific display images for displaying, on the virtual screens, a display object representing an object to be displayed present between two focal lengths next to each other of the plurality of focal lengths; and a display controller configured to display each of the generated distance-specific display images on the virtual screen corresponding to a focal The Use Of Art And The Focal far in a direction of a field of view of a user wearing the head-mounted display apparatus, out of the two focal lengths next to each other.

As a head-mounted display apparatus Head Mounted Display HMD to be worn by a user on the head to display images and the like within the user's visual field, a transmission-type head-mounted display apparatus is known that allows an external scene to be transmissively viewed along with display images.

When the external scene and the display images are overlaid for displaying in the transmission-type head-mounted display apparatus, an optical mismatch resulting from a deviation in angle of convergence and a deviation in a focal length between the external scene and article source display images may occur. As a result, the user may experience an eye strain or a discomfort.

Thus, there have been, in the related art, proposed various technologies for reducing the optical mismatch in the transmission-type head-mounted display apparatus. For example, in JP-A, a technology is proposed which allows an angle of convergence of a video display unit to be modified according to a point-of-fixation distance of a user wearing the transmission-type head-mounted display apparatus.

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However, in the technology described in JP-A, in reality, there is room for improvement in terms of focal length. For example, when the video display unit described in JP-A is moved in a sight direction of a user according to the point-of-fixation distance of the user, the problem is that it is not possible to simultaneously display display images of a plurality of objects to be displayed present at locations having different point-of-fixation distances, and when the point of fixation of the user moves, a display delay may occur.

Such a problem is not only found in the transmission-type head-mounted display apparatus but also in a head-mounted display apparatus which blocks transmittance of the external scene.

According to an exemplary embodiment of the invention, a head-mounted display apparatus is provided. The head-mounted display apparatus includes a display unit configured to display each of virtual screens that is set to each of a plurality of predetermined focal lengths, a distance-specific image generation unit configured to generate distance-specific display images for displaying, on the virtual screens, a display object representing an object to be displayed present between two focal lengths next to each other of the plurality of focal lengths, and a display controller configured to display each of the generated distance-specific display images on the virtual screen corresponding to a focal length far in a direction of a field of view of a user wearing the head-mounted display apparatus, out of the two focal lengths next to each other.

The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

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The head mounted display apparatus is a display apparatus to be mounted on a user's head and is also referred to as a Head Mounted Display HMD. The HMD is a see-through transmission-type head mounted display apparatus that provides an image appearing in an external scene viewed through glasses. The HMD includes a display unit 20 configured to allow the user to view images and a control device 10 configured to control the display unit The display unit 20 is a head-mounted body to be worn by the user on the head and has an eyeglasses-like shape in the exemplary embodiment.]