Liquid crystal matrix driving method

Claim 2

In a matrix driving method of a liquid crystal display device having a ferroelectric liquid crystal interposed between X and Y electrodes, a liquid crystal matrix driving method characterized in that at least pixels for changing the light transmission state are in advance set to the initial state of either a light ON state or a light OFF state and are then kept selectively in said initial state or brought into the other of the light ON state or the light OFF state by time-division driving.

Claim 3

A liquid crystal matrix driving method according to claim I, wherein when said initial state is set to the light ON state, a write voltage below V wsat(OFF) for bringing the liquid crystal to the light OFF state or a voltage below a first threshold voltage V b th(OFF) of the liquid crystal is applied, and when said initial state is set to the light OFF state, a write voltage above Vwsat(ON) for bringing the liquid crystal to the light ON state or a voltage below a second threshold voltage V bth(ON) of the liquid crystal is applied to the liquid crystal.

Claim 4

In a matrix driving apparatus of a liquid crystal device having a ferroelectric liquid crystal interposed between X and Y electrodes, a liquid crystal driving apparatus comprising first driving means (23a - 23d, 24a - 24d, 25, 26) for bringing simultaneously pixels into a light ON or OFF state for one line or more, and second driving means (23a - 23d, 24a - 24d, 25, 26) for bringing said pixels into the light ON or OFF state in accordance with display signals.

Claim 5

In a matrix driving apparatus of a liquid crystal device having a ferroelectric liquid crystal interposed between X and Y electrodes, a liquid crystal driving apparatus comprising first driving means (23a - 23d, 24a - 24d, 25, 26) for bringing simultaneously pixels into a light ON or OFF state for one line or more, and second driving means (23a - 23d, 24a - 24d, 25, 26) for bringing said pixels into the light ON or OFF state in accordance with display signals.

Claim 6

A liquid crystal driving apparatus according -to claim I, wherein said pixels of an (N + f)th line are driven by said first driving means when said pixels of an Nth line are being driven by said second driving means.

Claim 7

A liquid crystal driving apparatus according to claim 3. which further includes means for applying. to said pixels. a first driving voltage (D. E. F. G in Fig. 29) for holding said kght OFF state or a second driving voltage (C in Fig. 29) for inversing said light OFF state by said second driving means when said pixels are brought into said light OFF state by said first driving means. and said first driving voltage (G in Fig. 29) for holding said light ON state or a third driving voltage (A, B in Fig. 29) of inversing said light ON state by said second driving means, when said pixels are brought into said light ON state by said first driving means.

Claim 8

In a time-division driving method of a liquid crystal device interposing a ferroelectric liquid crystal between scanning electrodes the number of which is plural and signal electrodes the number of which is plural a time-divison driving method of a ferroelectric liquid crystal device comprising: applying primarily a first voltage to said ferroelectric liquid crystal so that the direction of ferroelectric liquid crystal molecules in the proximity of said scanning electrodes and said signal electrodes is substantially in agreement with that of said ferroelectric liquid crystal molecules at about an intermediate portion between said scanning electrodes and said signal electrodes, in a selection period which determines the light transmission state of said liquid crystal device; and applying a second voltage so that the direction of said ferroelectric liquid crystal molecules in the proximity of said scanning electrodes and said signal electrodes is substantially in agreement with that in said selection period and the direction of said ferroelectric liquid crystal molecules in the proximity of said scanning electrodes and said signal electrodes is different from that at said intermediate portion between said scanning electrodes and said signal electrodes, and a third voltage in mixture with said second voltage, sothat the direction of said ferroelectric liquid crystal molecules in the proximity of said scanning electrodes and said signal electrodes is substantially in agreement with that in said selection period, and the direction of said ferroelectric liquid crystal molecules at said intermediate portion between said scanning electrodes and said signal electrodes is substantially in agreement with that in said selection period, in a non-selection period which holds the light transmission state of said liquid crystal device.

Claim 9

In a time-division driving method of a liquid crystal device interposing a ferroelectric liquid crystal between scanning electrodes the number of which is plural and signal electrodes the number of which is plural a time-divison driving method of a ferroelectric liquid crystal device comprising: applying primarily a first voltage to said ferroelectric liquid crystal so that the direction of ferroelectric liquid crystal molecules in the proximity of said scanning electrodes and said signal electrodes is substantially in agreement with that of said ferroelectric liquid crystal molecules at about an intermediate portion between said scanning electrodes and said signal electrodes, in a selection period which determines the light transmission state of said liquid crystal device; and applying a second voltage so that the direction of said ferroelectric liquid crystal molecules in the proximity of said scanning electrodes and said signal electrodes is substantially in agreement with that in said selection period and the direction of said ferroelectric liquid crystal molecules in the proximity of said scanning electrodes and said signal electrodes is different from that at said intermediate portion between said scanning electrodes and said signal electrodes, and a third voltage in mixture with said second voltage, sothat the direction of said ferroelectric liquid crystal molecules in the proximity of said scanning electrodes and said signal electrodes is substantially in agreement with that in said selection period, and the direction of said ferroelectric liquid crystal molecules at said intermediate portion between said scanning electrodes and said signal electrodes is substantially in agreement with that in said selection period, in a non-selection period which holds the light transmission state of said liquid crystal device.

Claim 10

A time-division driving method of a ferroelectric liquid crystal device according to claim I, wherein said first, second and third voltage satisfy the relation: first voltage > second voltage > third voltage

Claim 11

A time-division driving method of a ferroelectric liquid crystal device according to claim I or 2, wherein said third voltage is applied at a pre-stage or postage of said the period for selecting one line.

Claim 12

A time-division driving method of a ferroelectric liquid crystal device according to claim 1, 2 or 3, wherein the application time of said third voltage is equal to. or longer than, the relaxation time of said ferroelectric liquid crystal.