Driving device and driving method of matrix-type display apparatus for carrying out time-division gradation display

A driving method of a matrix-type display apparatus which permits a time-division gradation display, designed for a matrix-type display apparatus having a memory effect which permits a gradation display with a number of gradations R (R is an integer of not less than 2), said matrix-type display apparatus including m scanning electrodes and a plurality of signal electrodes which cross each other, said driving method comprising the steps of:

• (i) scanning said m scanning electrodes n times in one frame period under such condition that a time ratio of the 1st, the 2nd, . . . , the nth display periods (n is an integer of not less than 2) is X:RX:
• . . . :R.sup.n-1 X (X is a positive integer) based on R and n which satisfy
• ROT.sub.n (X+Y).noteq.ROT.sub.n ((1+R)X+2Y)
• ROT.sub.n (X+Y).noteq.ROT.sub.n ((1+R+R.sup.2)X+3Y) . . .
• ROT.sub.n (X+Y).noteq.ROT.sub.n ((1+R+. . .+R.sup.n-1)X+(n-1)Y)=0
• ROT.sub.n ((1+R)X+2Y).noteq.ROT.sub.n ((1+R+R.sup.2)X+3Y) . . .
• ROT.sub.n ((1+R+. . .+R.sup.n-2)X+(n-1)Y).noteq.ROT.sub.n ((1+R+. . .+R.sup.n-1)X)=0
• wherein ROT.sub.n (a) is a remainder when dividing a (a is 0 or a positive integer) by n, and X+Y is 0 or a positive integer,
• X and Y which satisfies
• (1+R+. . .+R.sup.n-1)X+nY=n(m+b)
• wherein b is 0 or a positive integer;
• and
• (ii) supplying data assigned to the 1st, 2nd, . . . , the nth display periods to said plurality of signal electrodes respectively in ath, (X+Y+a)th, . . . , [(1+R+. . . +R.sup.n-2)X+(n-1)Y+a]th selection periods.

A driving method of a matrix-type display apparatus which permits a time-division gradation display, designed for a matrix-type display apparatus having a memory effect which permits a gradation display with a number of gradations R (R is an integer of not less than 2), said matrix-type display apparatus including a plurality of scanning electrodes and a plurality of signal electrodes which cross each other, said driving method comprising the steps of:

• (i) scanning said plurality of scanning electrodes n times in one frame period under such condition that a time ratio of the 1st, the 2nd, . . . , the nth display periods (n is an integer of not less than 2) is X:RX:
• . . . :R.sup.n-1 X (X is a positive integer);
• (ii) storing data assigned respectively to the 1st, 2nd, . . . , the nth display periods in a plurality of memory blocks;
• and
• (iii) outputting the data from the plurality of memory blocks together for each display period of each scanning electrode, whereby the data is supplied to said plurality of signal electrodes.

A matrix-type display apparatus having a memory effect which permits a gradation display with a number of gradations R (R is an integer of not less than 2), said matrix-type display apparatus including m scanning electrodes and a plurality of signal electrodes which cross each other, comprising:

• a scanning electrode driving circuit for scanning said m scanning electrodes n times in one frame period under such condition that a time ratio of the 1st, the 2nd, . . . , the nth display periods (n is an integer of not less than 2) is X:RX:
• . . . :R.sup.n-1 X (X is a positive integer) based on R and n which satisfy
• ROT.sub.n (X).noteq.ROT.sub.n ((1+R)X)
• ROT.sub.n (X).noteq.ROT.sub.n ((1+R+R.sup.2)X) . . .
• ROT.sub.n (X).noteq.ROT.sub.n ((1+R+. . .+R.sup.n-1)X)=0
• ROT.sub.n ((1+R)X).noteq.ROT.sub.n ((1+R+R.sup.2)X) . . .
• ROT.sub.n ((1+R+. . .+R.sup.n-2)X).noteq.ROT.sub.n ((1+R+. . .+R.sup.n-1)X)=0
• wherein ROT.sub.n (a) is a remainder when dividing a (a is 0 or a positive integer) by n, and X which satisfies (1+R+. . .+R.sup.n-1)X=n(m+b), wherein b is 0 or positive integer;
• and
• a signal electrode driving circuit for supplying data assigned to the 1st, 2nd, . . . , the nth display periods to said plurality of signal electrodes respectively in the ath, (X+a)th, . . . , the [(1+R+. . .+R.sup.n-2)X+a]th selection periods.

A matrix-type display apparatus having a memory effect which permits a gradation display with a number of gradations R (R is an integer of not less than 2), said matrix-type display apparatus including m scanning electrodes and a plurality of signal electrodes which cross each other, comprising:

• a scanning electrode driving circuit for scanning said m scanning electrodes n times in one frame period in such a manner that a time ratio of the 1st, the 2nd, . . . , the nth display periods (n is an integer of not less than 2) is X:RX:
• . . . :R.sup.n-1 X (X is a positive integer) based on R and n which satisfy
• ROT.sub.n (X+Y).noteq.ROT.sub.n ((1+R)X+2Y)
• ROT.sub.n (X+Y).noteq.ROT.sub.n ((1+R+R.sup.2)X+3Y) . . .
• ROT.sub.n (X+Y).noteq.ROT.sub.n ((1+R+. . .+R.sup.n-1)X+(n-1)Y)=0
• ROT.sub.n ((1+R)X+2Y).noteq.ROT.sub.n ((1+R+R.sup.2)X+3Y) . . .
• ROT.sub.n ((1+R+. . .+R.sup.n-2)X+(n-1)Y).noteq.ROT.sub.n ((1+R+. . .+R.sup.n-1)X)=0
• wherein ROT.sub.n (a) is a remainder when dividing a (a is 0 or a positive integer) by n, and
• X and Y which satisfy
• (1+R+. . .+R.sup.n-1)X+nY=n(m+b)
• wherein b is 0 or a positive integer;
• and
• a signal electrode driving circuit for supplying data assigned to the 1st, 2nd, . . . , the nth display periods to said plurality of signal electrodes respectively in ath, (X+a)th, . . . , [(1+R+. . . +R.sup.n-2)X+(n-1)Y+a]th selection periods.

A matrix-type display apparatus having a memory effect which permits a gradation display with a number of gradations R (R is an integer of not less than 2), said matrix-type display apparatus including a plurality of scanning electrodes and a plurality of signal electrodes which cross each other, comprising:

• a scanning electrode driving circuit for scanning said plurality of scanning electrodes n times in one frame period in such a manner that a time ratio of the 1st, the 2nd, . . . the nth display periods (n is an integer of not less than 2) is X:RX:
• . . . :R.sup.n-1 X (X is a positive integer);
• a signal electrode driving circuit for supplying data assigned to each display period to the signal electrode respectively in selection periods of said plurality of scanning electrodes;
• a plurality of memory blocks which permit addresses to be inputted independently, said plurality of memory blocks storing the data using a common address at a display period of each scanning electrode;
• distribution means for distributing the data to said plurality of memory blocks;
• and
• control means for storing distributed data using addresses which are different among groups, each group being composed of not less than two memory blocks and reading the data from each memory block using the common address, whereby the data is outputted to said plurality of signal electrode driving circuit.