| 摘要 |
<p>A system for displaying information comprises a writing board (1, 40) provided with an optically readable position-coding pattern. A first position-sensing device (41) is adapted to create, on the basis of the optically readable position-coding pattern, an electronic representation of information which is being written on the writing board; and a second position-sensing device (42) is adapted to create, on the basis of the optically readable position-coding pattern, an electronic representation of information which is being erased from the writing board with an eraser.</p> |
