Liquid crystal display device

Claim 2

A liquid crystal display device comprising: a group of common electrodes formed on one substrate of a pair of substrates for sandwiching a liquid crystal layer; a group of segment electrodes formed on the other substrate of the pair of substrates; wherein a multiplex driving is achieved successively by applying a common voltage waveform comprising selective voltage and non-selective voltage to the group of common electrodes and applying a segment voltage waveform comprising an ON voltage and an OFF voltage to the group of segment electrodes; and wherein at least one of the common voltage waveform and the segment voltage waveform is changed in accordance with the pattern of drawings and/or characters displayed in the liquid crystal display device.

Claim 3

A liquid crystal display device according to claim 1, in which the pattern of drawings and/or characters displayed in the liquid crystal device is driven by the multiplex by means of the voltage standard means.

Claim 4

A matrix liquid crystal display device for displaying characters or a pattern comprising: a first substrate; a plurality of common electrodes being formed on said first substrate; a second substrate; a plurality of segment electrodes being formed on said second substrate; a liquid crystal layer sandwiched between said first substrate and said second substrate; multiplex driving means for providing a common voltage waveform including a selected voltage or a non-selected voltage to said plurality of common electrodes and providing a segment voltage waveform including an ON voltage or an OFF voltage to said plurality of segment electrodes; and compensation means for compensating at least one of said common voltage waveform or said segmented voltage waveform based upon said pattern or said characters displayed by said liquid crystal display device.

Claim 5

A matrix liquid crystal display device for displaying characters or a pattern comprising: a first substrate; a plurality of common electrodes being formed on said first substrate; a second substrate; a plurality of segment electrodes being formed on said second substrate; a liquid crystal layer sandwiched between said first substrate and said second substrate; multiplex driving means for providing a common voltage waveform including a selected voltage or a non-selected voltage to said plurality of common electrodes and providing a segment voltage waveform including an ON voltage or an OFF voltage to said plurality of segment electrodes; and compensation means for compensating at least one of said common voltage waveform or said segmented voltage waveform based upon said pattern or said characters displayed by said liquid crystal display device.

Claim 6

A matrix liquid crystal display device according to claim 3 in which said common electrodes intersect said segment electrodes to define a matrix having a dot at each intersection, the dots being in either an ON state or an OFF state depending on the voltage applied to the intersecting common and segment electrodes, said multiplex driving means sequentially switching the selected voltage among the common electrodes, the compensation means being arranged to receive a data signal representative of the characters or pattern to be displayed, and producing a sign signal and strength signal, said multiplex driving means providing a common voltage waveform or a segment voltage waveform having a direction and size based at least in part upon the sign signal and the strength signal.

Claim 7

A matrix liquid crystal display device according to claim 4, in which the compensation means comprises count means for receiving the data signal, substantially counting the number of dots in the ON state on the common electrode to next be selected, and outputting a count, first count holding means for the count from the count means, storing the count and outputting a stored count when a successive count is output by the count means, a second count holding means for receiving the stored count output from the first count holding means, storing the stored count value and outputting a second stored count when a successive stored count is output by the first count holding means, arithmetic means for receiving the first stored count and the second stored count and outputting a value I substantially equal to the difference between the count stored in the second count holding means and the count stored in the first count holding means and the sign signal, and a pulse width control circuit for receiving the value I and producing a strength signal based at least in part on the absolute value of I.

Claim 8

A matrix liquid crystal display device according to claim 3, in which the common electrodes intersect with the segment electrodes to define a matrix having a dot at each intersection, the dots having either an ON state or an OFF state depending on the voltage supplied to the intersecting common and segment electrodes, said multiplex driving means sequentially switching the selected voltage among the common electrodes, the compensation means being arranged to receive a data signal representative of the character or pattern to be displayed and producing a strength signal in response thereto.

Claim 9

A matrix liquid crystal display device according to claim 3, in which the common electrodes intersect with the segment electrodes to define a matrix having a dot at each intersection, the dots being in either an ON state or an OFF state depending on the voltage applied to the intersecting common and segment electrodes said multiplex driving means sequentially switching the selected voltage among the common electrodes, the compensation means being arranged to receive a data signal representative of the character or pattern to be displayed, and the compensation means including a count means for substantially counting the number of dots in the ON state on the liquid crystal display and producing a count, a count holding means for storing the count and producing a strength signal, the multiplex driving means receiving the strength signal and producing a voltage output for compensating at least one of the non-­ selected voltage and the segment voltage waveform in response to the strength signal.

Claim 10

A matrix liquid crystal display device according to claim 3, in which the common electrodes intersect with the segment electrodes to define a matrix having a dot at each intersection, the dots being in either an ON state or an OFF state depending on the voltage applied to the intersecting common and segment electrodes, said multiplex driving means sequentially switching the selected voltage among the common electrodes, the compensation means being arranged to receive a data signal representative of the character or pattern to be displayed, the compensation means producing a sign signal and a strength signal representative of the difference between the sum of the number of dots in the ON state of the present and next common electrodes to receive the selected voltage and the number of dots on each common electrode, said multiplex driving means compensating at least one of a non-selected voltage and a segment voltage waveform in response to said sign and strength signals.

Claim 11

A matrix liquid crystal display device according to claim 4, in which the compensation means includes count means for substantially counting the number of dots in the ON state of the common electrode to next receive the selected voltage and outputting a count in response to the data signal, a first count holding means for storing the count and outputting a stored count in response to the next count output of the count means, a second count holding means for storing the stored count of the first count holding means outputting a second stored count in response to the next stored count output by the first count holding means, arithmetic means for for receiving the first stored count and the second stored count and outputting a value F equal to the difference between the sum of the first and second stored counts and the number of dots on a common electrode to produce said sign and strength signals.

Claim 12

A matrix liquid crystal display device according to claim 3, in which the common electrodes intersect with the segment electrodes to define a matrix having a dot at each intersection, the dots existing in either an ON state or an OFF state depending on the voltage applied to the intersecting come on and segment electrodes, said multiplex driving means sequentially switching the selected voltage among the common electrodes, the compensation means receiving a data signal representative of the character or pattern to be displayed, the compensation means producing a strength signal representative of the value Z′ equal to the sum of the number of dots in the ON state of the next common electrode to receive the selected voltage and a constant times the difference between the number of dots in the ON state in the next and present common electrodes to receive the selected voltage, said multiplex driving means providing compensation to the selected signal of the next common electrode of a period representative of Z′.

Claim 13

A matrix liquid crystal display device according to claim 3, in which the common electrodes intersect with the segment electrodes to define a matrix having a dot at each intersection, the dots being in either an ON state or an OFF state depending on the voltage applied to the intersecting common and segment electrodes, said multiplex driving means sequentially switching the selected voltage among the common electrodes, the compensation means receiving a data signal representative of the character or pattern to be displayed, the compensation means producing a first strength signal and a first sign signal representative of a value I equal to the difference between the number of dots in the ON state on the common electrode presently receiving the selected voltage and next to receive the selected voltage; a second strength signal and a second sign signal representative of a value F equal to the sum of the number of dots in the ON state on the common electrode presently receiving the selected voltage and next to receive the selected voltage less the number of dots on the common electrode, a third strength signal representative of a value T equal to the number of ON dots on the liquid crystal display and a fourth strength signal representative of a value Z equal to the number of ON dots of the common electrode, in response to the data signal and the multiplex driving means providing a voltage output for compensating the non-selected voltage during alternating periods in response to the first strength and sign signals and the second strength and sign signals and further in response to the third strength signal, and compensating the selected voltage in response to the fourth strength signal.