| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow a road sign to be recognized more clearly than before. <P>SOLUTION: A display surface 6 is inclined and made more visible utilizing natural phenomena such as the sun and rain. Since a display board is inclined, rain falls on the display board, sunlight pours on the display board to set off smudge sticking to the display surface, by photosynthesis, and the smudge is washed away with rain to make the display surface look always clear. <P>COPYRIGHT: (C)2008,JPO&INPIT |
