| 摘要 |
A display device comprises a height-adjustable display board ( 10 ) which is adapted to be written on. Further, the display device comprises a height-adjustable projection unit ( 18 ) for projecting images onto the display board ( 10 ). With the aid of a mechanical connection means ( 20,22 ) connecting the display board ( 10 ) to the projection unit ( 18 ), it is guaranteed that, upon vertical displacement of the display board ( 10 ) or the projection unit ( 18 ), a vertical distance between the display board ( 10 ) and the projection unit ( 18 ) will be substantially maintained. |
