Hand-writable polymer dispersed liquid crystal board set with high resistance layer of crosslinking polymer adjacent conductive layer

Abstract

A liquid crystal display device of externally charging type, including a screen from the outside of which display and erasing operations can be repeatedly performed simply, and having an excellent memory retention performance of the recorded image and durability. Also, 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 includes a layered structure comprising, in the following order: a conductive layer; a transparent high-electric resistance layer having a volume resistivity of 10.sup.13 .OMEGA..cndot.cm or more in a 20.degree. C. air at a relative humidity of 90%; a liquid crystal-dispersed polymer layer which has a volume resistivity of 10.sup.13 .OMEGA..cndot.cm or more in a 20.degree. C. air at a relative humidity of 90%; and a transparent insulator layer. The hand-writable liquid crystal board set comprises: (A) a board of the above liquid crystal display device, (B) display means for displaying recording images onto the board surface, and erasing means for erasing the recorded images; and (C) a power source 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 electrically connected to one terminal of the power source which is connected at the other terminal to the conductive layer; and the erasing means employs an erasing member electrically connected to the conductive layer.

Dependencies are inferred from the claim text.