Patent ID: 8576142

Claim:
A display device, comprising: a luminous flux generator which generates luminous flux including image information; a reflector plate which reflects the luminous flux generated by the luminous flux generator toward one eye of a viewer; a driver which drives the reflector plate to thereby adjust a direction of the luminous flux; a head detector which includes: a first pair of distance sensors which are disposed at predetermined positions and output first measurement values corresponding to distances therefrom to the head of the viewer; and a second pair of distance sensors which are disposed at positions different from the predetermined positions, and output second measurement values corresponding to distances therefrom to the head of the viewer; and a controller which: calculates a first calculation value and a second calculation value based on the first measurement values and the second measurement values respectively, determines a coefficient based on the first calculation value which is obtained at a time when the second calculation values becomes zero, calculates a relative position of the head of the viewer based on the first calculation value and the coefficient, and controls the driver to drive the reflector plate based on the calculated relative position.