Electro-optical device utilizing a nematic liquid crystal of schiff base type

Claim 2

IN AN ELECTRO-OPTICAL DEVICE COMPRISING A LAYER OF A NEMATIC LIQUID CRYSTAL OF SCHIFF BASE TYPE CAPABLE OF EXHIBITING DYNAMIC SCATTERING EFFECT; MEANS FOR SUPPORTING SAID LIQUID CRYSTAL LAYER; A PLURALITY OF FIRST ELECTRODE MEANS FOR APPLYING A PULSE ELECTRIC FIELD TO SAID LIQUID CRYSTAL LAYER, SAID LIQUID CRYSTAL LAYER BEING DIVIDED THEREBY INTO A PLURALITY OF SEGMENTS; SECOND ELECTRODE MEANS FOR APPLYING A PULSE ELECTRIC FIELD TO SAID LIQUID CRYSTAL LAYER, THE SECOND ELECTRODE MEANS BEING POSITIONED OPPOSITE TO THE FIRST ELECTRODE MEANS, THE LIQUID CRYSTAL LAYER BEING SANDWICHED BETWEEN THE FIRST ELECTRODE MEANS AND THE SECOND ELECTRODE MEANS; MEANS FOR APPLYING A PULSE ELECTRIC FIELD THROUGH THE FIRST AND SECOND ELECTRODE MEANS TO THE SEGMENTS OF THE LIQUID LAYER BY MULTIPLEXING, AN IMPROVEMENT COMPRISING THE LIQUID CRYSTAL CONTAINING 0.01 TO 1.0 PERCENT BY WEIGHT OF AN ALKYL IODIDE COMPOUND HAVING AN ALKYL GROUP OF 1 TO 4 CARBON ATOMS, BASED ON THE NEMATIC LIQUID CRYSTAL.

Claim 3

An electro-optical device according to claim 1, wherein an amount of the alkyl iodide compound added is of from 0.05 to 0.8 percent by weight.

Claim 4

An electro-optical display device comprising: a pair of supporting members, at least one of them being transparent, whereby a dynamic scattering mode of a liquid crystal of Schiff base type is observed through said supporting members; a layer of said nematic liquid crystal containing 0.01 tO 1 percent by weight of an alkyl iodide compound having an alkyl group of 1 to 4 carbon atoms, based on the amount of the liquid crystal, said layer being interposed between said supporting member; first electrode means for applying a pulsating electric field for generating said dynamic scattering motion to said layer, wherein a plurality of displaying segments are formed by said first electrode means in said layer; second electrode means for applying said pulsating electric field in cooperation with said first electrode means, said first and second electrode means being formed on the inner surfaces of said respective supporting members; a pulse generator for producing a pulse having an amplitude larger than a dynamic scattering motion limit but smaller than a discharge voltage of said liquid crystal and a pulse width smaller than 10 ms; means operatively connected to said pulse generator for selectively supplying said pulse to the selected electrodes of said first electrode means and said second electrode means at a predetermined order for the said selected electrodes with a predetermined time interval in order to apply said pulsating electric field to the selected segments corresponding to said selected electrodes thereby to generate said dynamic scattering motion in said liquid crystal of said selected segments, said time interval being smaller than a period in which an intensity of light scattering to be observed decays to a predetermined value.

Claim 5

An electro-optical display device comprising: a pair of supporting members, at least one of them being transparent, whereby a dynamic scattering mode of a liquid crystal of Schiff base type is observed through said supporting members; a layer of said nematic liquid crystal containing 0.01 tO 1 percent by weight of an alkyl iodide compound having an alkyl group of 1 to 4 carbon atoms, based on the amount of the liquid crystal, said layer being interposed between said supporting member; first electrode means for applying a pulsating electric field for generating said dynamic scattering motion to said layer, wherein a plurality of displaying segments are formed by said first electrode means in said layer; second electrode means for applying said pulsating electric field in cooperation with said first electrode means, said first and second electrode means being formed on the inner surfaces of said respective supporting members; a pulse generator for producing a pulse having an amplitude larger than a dynamic scattering motion limit but smaller than a discharge voltage of said liquid crystal and a pulse width smaller than 10 ms; means operatively connected to said pulse generator for selectively supplying said pulse to the selected electrodes of said first electrode means and said second electrode means at a predetermined order for the said selected electrodes with a predetermined time interval in order to apply said pulsating electric field to the selected segments corresponding to said selected electrodes thereby to generate said dynamic scattering motion in said liquid crystal of said selected segments, said time interval being smaller than a period in which an intensity of light scattering to be observed decays to a predetermined value.

Claim 6

An electro-optical display device according to claim 3, wherein an amount of the alkyl iodide is of from 0.05 to 0.8 percent by weight based on the amount of the liquid crystal.