| 摘要 |
<p>A video display device is provided with: a screen (20) provided with a light guide plate (22) having a diffusion structure (24) for transmitting light having a specific wavelength to the inside and diffusing light to one side surface; a projection unit (12) for projecting an image on the screen (20) by visible light; a capturing unit (14) for capturing the light having the specific wavelength; and a position specification unit (4) wherein, when the light having the specific wavelength which has been transmitted in the light guide plate (22) is reflected by an object which is brought into contact with the light guide plate (22), the reflected light is captured by the capturing unit(14) to specify the position where the object is in contact with the light guide plate (22).</p> |
