Patent ID: 7230765
Filing Date: 2007-06-12
Classification: G02B,G02C

Abstract:
1. An image display device comprising: a main body that can be worn on the head of a user; and display means for displaying a predetermined image, said display means being provided on or in said main body in such a manner that it is not very clearly visible for said user when said user wearing said main body on his or her head looks straight ahead, and that it becomes clearly visible for said user when said user moves his or her eyes down at an angle equal to or larger than 20 degrees; said image display device offers good visibility for said user when said user wearing said main body on his or her head looks straight ahead, wherein said display means comprises a display screen on which images are shown and an optical system to guide an image shown on said display screen to the eye(s) of said user, said display means being provided on or in said main body in such a manner that the optical axis of said optical system generally overlaps the line of sight of said user when said user moves his or her eyes down at an angle equal to or larger than 20 degrees and said display means becomes clearly visible for said user.