Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-01-25
1994-09-27
Gross, Anita P.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 74, 359 83, G02F 113, G02F 11333
Patent
active
053511433
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:
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Abe Yutaka
Ishii Hirokazu
Murata Yasuzo
Sato Morio
Takano Jun
Gross Anita P.
Kabushiki Kaisha Pilot
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