Image display device and image display method

An image display device worn on a head of a user comprising:

• a display configured to display at least one virtual object;
• a camera configured to capture eyes of the user;
• and
• a processing circuit configured to:
• display the virtual object at a first definition on the display;
• in response to determining, based on an image of the eyes captured by the camera, that the user observes the virtual object for a first prescribed period of time or longer, display the virtual object at a second definition that is higher than the first definition, after switching from the first definition;
• in response to determining, based on the image of the eyes captured by the camera, that the user does not observe the virtual object displayed at the second definition for a second prescribed period of time or longer, display the virtual object at the first definition after switching from the second definition;
• and
• perform control such that when there is additional information of the virtual object, information indicating an existence of the additional information is displayed or the additional information is displayed in a manner different from the display of the virtual object, in response to determining that the user observes the virtual object,
• wherein the second prescribed period of time is longer than the first prescribed period of time.

An image display method of an image display device worn on a head of a user comprising:

• displaying at least one virtual object at a first definition on a display of the image display device;
• in response to determining that the user observes the virtual object for a first prescribed period of time or longer, displaying the virtual object at a second definition that is higher than the first definition, after switching from the first definition;
• in response to determining that the user does not observe the virtual object displayed at the second definition for a second prescribed period of time or longer, displaying the virtual object at the first definition after switching from the second definition;
• and
• controlling such that when there is additional information of the virtual object, information indicating an existence of the additional information is displayed or the additional information is displayed in a manner different from the display of the virtual object, in response to determining that the user observes the virtual object,
• wherein the second prescribed period of time is longer than the second prescribed period of time.