| 摘要 |
To shield a frame area 203b, a frame-like shield member 501 is superimposed over an LCD 203 while being separated from the LCD 203 by a distance L. The distance L satisfies L<2×(B−A)×f/D where f is a focal length of an optical system, D is a human pupil diameter determined statistically in advance, B is a width of the frame area, and A is a value determined statistically in advance as a width which will not be able to be shielded on a side of the frame area to be shielded by a side of the shield member.
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