Patent ID: 7719621

Claim:
An image display device comprising: a light source unit having a plurality of light sources configured to emit light corresponding to a plurality of pixels composing an image to be displayed; a light beam control unit configured to limit a viewing area of the image formed by the light emitted from the light source unit; a detection unit configured to detect a relative positional relationship between an eye of an observer of the image, and the light source unit and the light beam control unit; and an image control unit configured to control the light source unit in accordance with the positional relationship detected by the detection unit, the image control unit causing the light source unit to change display contents of the light forming the image with the viewing area limited by the light beam control unit, wherein the image control unit prevents the light source unit from outputting an image emitted from at least one light source of the light source unit corresponding to a position within a predefined normal viewing area when the observer is located in a repetitive area, the repetitive area being a position other than a predefined normal viewing area where an image formed by the light emitted from the at least one light source of the plurality of light sources of the light source unit is visible, the control unit determining that the observer is located within a repetitive area based on information from the detection unit.