| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive, light-weight, and small-sized video display device to be mounted on a head. SOLUTION: The device is provided with a single liquid crystal panel 1 on which a two-dimensional picture is displayed, a cross prism 2 which separates a luminous flux emitted from the liquid crystal panel 1 to the right and the left in the horizontal direction by semi-translucent faces 2L and 2R, and a pair of left and right eyepiece optical systems 3L and 3R which transmits separated luminous fluxes to left and right eyes EL and ER of an observer to display the two-dimensional picture as a virtual image. Each of eyepiece optical systems 3L and 3R has a first refracting face S1, a first reflection face S2, a second reflection face S3, and a second refracting face S4 in order from the observer's eye EL or ER. The first refracting face S1 and the second reflection face S3 are made of the same continuous optical face and function as the first refracting face S1 for an incident luminous flux which doesn't satisfy a total reflection condition, and function as the second reflection face S3 for an incident luminous flux satisfying the total reflection condition. |
