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≦p and 50≦f·d 2 /p are satisfied, where d=the distance (μm) 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.
A liquid crystal display device comprising: 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 said electrodes face each other; a liquid crystal material having a negative dielectric anisotropy, said material being disposed between said substrates, liquid-crystal molecules of said 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 said substrates when no voltage is applied to said electrodes; a pair of polarizing plates arranged on second major surfaces of the substrates; and a drive circuit for driving said liquid crystal device in a multiplex manner, wherein said liquid crystal material has a helical pitch, and the relationships of d≦p and 50≦f·d 2 /p are satisfied, where d =the distance (μm) between the substrates, p =the helical pitch of said liquid crystal material, and f =the frame frequency (Hz) in the drive mode of the device.
Claim 2
Dependent Claim
174 words
A liquid crystal display device comprising: 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 said electrodes face each other; a liquid crystal material having a negative dielectric anisotropy, said material being disposed between said substrates, liquid-crystal molecules of said 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 said substrates when no voltage is applied to said electrodes; a pair of polarizing plates arranged on second major surfaces of the substrates; and a drive circuit for driving said liquid crystal device in a multiplex manner, wherein said liquid crystal material has a helical pitch, and the relationships of d≦p and 50≦f·d 2 /p are satisfied, where d =the distance (μm) between the substrates, p =the helical pitch of said liquid crystal material, and f =the frame frequency (Hz) in the drive mode of the device.
Claim 3
Dependent Claim
18 words
The device according to claim 1, wherein the distance d between the substrates is 2 to 15 μm.
Claim 4
Dependent Claim
15 words
The device according to claim 1, wherein the frame frequency f is 30 or above.
Claim 5
Dependent Claim
24 words
The device according to claim 1, wherein said liquid crystal material is produced by adding a chiral dopant to a host liquid crystal material.
Claim 6
Dependent Claim
22 words
The device according to claim 4, wherein the amount of the chiral dopant to be added is less than 10% by weight.
Claim 7
Dependent Claim
15 words
The device according to claim 1, wherein the pitch p is 3 μm or more.