Patent ID: 6653989
Filing Date: 2003-11-25
Classification: G02B

Abstract:
A display comprising: a display optical system for guiding a light beam from a display means to the eyeballs of an observer; an image-pickup optical system for allowing a light beam from its external world to form an image on an image-pickup means; and optical path separating means provided in optical path for allowing an ocular optical axis of the light beam of said display optical system entering the eyeballs of the observer, or an imaginary ocular optical axis which is an extension of said ocular optical axis, and an external world optical axis of the light beam entering said image-pickup optical system from the external world to substantially coincide; the display means displaying image information periodically and intermittently, the image-pickup means recording image information from the external world periodically while the display means is not displaying image information,wherein the display further comprises change means capable of changing the display period of displaying image information on the display means and/or the image-pickup period of recording image information from the external world in the image-pickup means.