Image display device for changing focal point and convergence of display image
An image display device includes: an image display section that displays an image for a user and allows the user to visually recognize external light; a line-of-sight direction and distance detecting section that detects a line-of-sight direction of the user and a distance to an object located in the line-of-sight direction; and a display control section that controls display operation of the image display section. The image display section includes a focal point and convergence changing section that changes a convergence and a focal point of a display image to be projected. The display control section controls the focal point and convergence changing section based on the line-of-sight direction and the distance to the object detected by the line-of-sight direction and distance detecting section.
1. An image display device comprising:
an image display section that displays an image for a user and allows the user to visually recognize external light; and
a line-of-sight direction and distance detecting section that detects a line-of-sight direction of the user and a distance to an object located in the line-of-sight direction, wherein:
the image display section changes a convergence and a focal point of a display image to be projected by using a movable optical member, and
the focal point and the convergence of the display image to be projected are changed based on the line-of-sight direction and the distance to the object detected by the line-of-sight direction and distance detecting section.
2. The image display device according to claim 1 , wherein
the convergence and the focal point of the display image to be projected are adjusted based on an angle of convergence obtained from the line-of-sight direction and the distance to the object detected by the line-of-sight direction and distance detecting section.
3. The image display device according to claim 2 , wherein
the movable optical member changes the convergence and the focal point, in conjunction with each other, of the display image to be projected, in a predetermined relationship.
4. The image display device according to claim 3 , wherein
the movable optical member is asymmetrically disposed with respect to a projection optical axis of a projection optical system for displaying an image for the user, is driven so as to change a power of the movable optical member, and changes the convergence and the focal point of the display image to be projected with a change in the power.
5. The image display device according to claim 4 , wherein:
the movable optical member includes a pair of lenses,
the pair of lenses each include a concave portion and a convex portion; and
the movable optical member adjusts the focal point and the convergence by moving at least one of the pair of lenses in a horizontal direction intersecting an optical axis.
6. The image display device according to claim 4 , wherein
the movable optical member changes its lens shape based on an amount of a liquid contained therein.
7. The image display device according to claim 4 , wherein
the movable optical member deforms a boundary between two kinds of liquids having different specific gravities with an electric field applied to the liquids.
8. The image display device according to claim 1 , wherein
the line-of-sight direction and distance detecting section detects a distance to an object within a range of a predetermined field of view with respect to the detected line-of-sight direction.