| 摘要 |
A projection screen includes first and second basic materials, at least one diffusing layer sandwiched between the first and the second basic materials, a writing layer coating the second basic material, and a reflecting layer over the first basic material; the writing layer allows the ink of whiteboard markers to adhere on and get erased therefore the projection screen allows people to write thereon with whiteboard markers besides being used for images to be projected on by a projector.
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