Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-10-05
1992-03-03
Hille, Rolf
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 85, 359 92, 359106, G02F 113
Patent
active
050937413
ABSTRACT:
A liquid crystal display device has a birefringence control type liquid crystal display unit including a pair of substrates having electrodes on their first major surfaces and arranged with a predetermined distance therebetween such that the electrodes face each other, a liquid crystal material having a negative dielectric anisotropy, the material being disposed between the substrates, liquid-crystal molecules of the liquid crystal material being aligned vertically such that longitudinal axes of said molecules are inclined at a slight pretilt angle in respect of an axis vertical to the substrates when no voltage is applied to the electrodes, a pair of polarizing plates arranged on second major surfaces of the substrates, and a device circuit for driving the liquid crystal device in a multiplex manner. This device is characterized in that the liquid crystal material has a helical pitch in the state wherein the material is not disposed between the substrates, and the relationships of d.ltoreq.p and 50.ltoreq.f.multidot.d.sup.2 /p are satisfied, where d=the distance (.mu.m) between the substrates, p=the helical pitch of liquid crystal material disposed between the substrates, and f=the frame frequency (Hz) in the drive mode of the device.
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Ogawa et al., "New Electro-optical effect: Optical Activity of Electric-field-induced Twisted-nematic liquid Crystal", Electronics Letters; vol. 12, No. 3, Feb. 5, 1976, pp. 70-71.
Hatoh Hitoshi
Hirai Hoko
Kinoshita Yoshihiro
Matsumoto Shoichi
Shohara Kiyoshi
Hille Rolf
Ho Tan
Kabushiki Kaisha Toshiba
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