| 摘要 |
<p>The present invention is to provide a liquid crystal display device of externally charging type, including a screen which can be fabricated in large size and from the outside of which display and erasing operations can be repeatedly performed in a simple manner, and having an excellent memory retention performance of the recorded image and sufficient durability in practice. The present invention is also to provide a hand-writable liquid crystal board set being excellent in operativity, performances, safety, including the above liquid crystal display device as a liquid crystal board. The liquid crystal display device of externally charging type in accordance with present invention, includes a layered structure comprising: in the following order, a conductive layer (3); a transparent high-electric resistance layer (4) having a volume resistivity of 10<1><3> OMEGA . cm or more in a 20 DEG C air at a relative humidity of 90%; a liquid crystal-dispersed polymer layer (7) in which liquid crystal is finely dispersed in polymer matrix thereof and which has a volume resistivity of 10<1><3> OMEGA .cm or more in a 20 DEG C air at a relative humidity of 90%; and a transparent insulator layer (8). The hand-writable liquid crystal board set of the present invention comprises: (A) a liquid crystal board made of the above liquid crystal display device of externally charging type, (B) display means for displaying recording images onto the board surface of the liquid crystal board, and erasing means for erasing the recorded images; and (C) a power source (9) for generating a surface potential between the surface of the liquid crystal board and the conductive layer by the display means; wherein the display means employs a writing member (20) electrically connected to one terminal of the power source which is connected at the other terminal thereof to the conductive layer; and the erasing means (27) employs an erasing member electrically connected to the conductive layer (3). <IMAGE></p> |
