US5247376A
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US
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Method of driving a liquid crystal display device
Assignee: Seiko Epson Corp
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Filing: 1989-11-09
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Granted: 1993-09-21
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Expires: 2009-11-09
Abstract
Abstract A method of activating a matrix liquid crystal display formed with column electrodes intersecting row electrodes and liquid crystal material therebetween in which liquid crystal pixels are defined at the intersections of the row and column electrodes. The column electrodes are provided with voltage waveforms of high and low magnitude corresponding to display data. The row electrodes are supplied with a sequential scanning signal of activating magnitude. During one data output period, a signal for the data about the selected rows is delivered with one polarity and then switches to the opposite polarity N number of times (where N is a positive integer) during the same data output period to prevent crosstalk in the column electrodes.
Inventors
- 👤 Yoichi Wakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:51
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/367
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
146 words
A method of activating a liquid crystal display including row electrodes selectively supplied with scanning signals and column electrodes selectively supplied with data signals and liquid crystal material between the column and scanning electrodes to form liquid crystal picture element pixels defined at intersections between the row and column electrodes, comprising the steps of: applying one activating voltage of activating magnitude to selected row electrodes for activating a liquid crystal picture element and then successively applying an activating voltage to successive row electrodes; and applying a data signal waveform to a column electrode and then inverting the waveform about a selected reference value, the waveform inverted N times (N is an integer) within one data output period so that the effective voltage at the picture element changes polarity N times during a data output period, said activating voltage corresponding to one of the data signal waveforms.
Claim 2
Independent Claim
146 words
A method of activating a liquid crystal display including row electrodes selectively supplied with scanning signals and column electrodes selectively supplied with data signals and liquid crystal material between the column and scanning electrodes to form liquid crystal picture element pixels defined at intersections between the row and column electrodes, comprising the steps of: applying one activating voltage of activating magnitude to selected row electrodes for activating a liquid crystal picture element and then successively applying an activating voltage to successive row electrodes; and applying a data signal waveform to a column electrode and then inverting the waveform about a selected reference value, the waveform inverted N times (N is an integer) within one data output period so that the effective voltage at the picture element changes polarity N times during a data output period, said activating voltage corresponding to one of the data signal waveforms.
Claim 3
Dependent Claim
15 words
The method of claim 1, wherein the liquid crystal display is an active matrix display.
Claim 4
Dependent Claim
32 words
The method of claim 1, wherein a layer of liquid crystal material and a MIM device are electrically coupled, in series, between each intersection of a row electrode and a column electrode.
Claim 5
Dependent Claim
27 words
The method of claim 3, wherein the liquid crystal material is electrically coupled to the row electrode and the MIM is electrically coupled to the column electrode.
Claim 6
Dependent Claim
45 words
The method of claim 1, wherein a non-activating voltage is applied to the non-selected row electrodes during the data output period and the activating voltage applied to the selected row electrodes is of greater magnitude than the non-activating voltage applied to the other row electrodes.
Claim 7
Dependent Claim
18 words
The method of claim 5, wherein the data signal voltages and the scanning voltages are all non-negative voltages.
Claim 8
Dependent Claim
16 words
The method of claim 5, wherein the data signals and scanning signals are all non-positive voltages.
Claim 9
Dependent Claim
32 words
The method of claim 1, wherein the voltage applied to a row electrode during a data output period is initially of large magnitude and then switches to a voltage of lower magnitude.
Claim 10
Dependent Claim
33 words
The method of claim 1, wherein the voltage applied to the selected row electrodes during a data output period is initially a low magnitude voltage and then switches to a higher magnitude voltage.
Claim 11
Dependent Claim
24 words
The method of claim 8, wherein the voltage applied to the column electrodes inverts a plurality of times during a single data output period.
Claim 12
Dependent Claim
23 words
The method of claim 8, wherein the voltage applied to the column electrodes inverts one time (N=1) during a single data output period.
Claim 13
Dependent Claim
25 words
The method of claim 9, wherein the effective voltage applied to a picture element switches polarity a plurality of times during a data output period.
Claim 14
Dependent Claim
24 words
The method of claim 9, wherein the effective voltage applied to a picture element switches polarity one time (N=1) during a data output period.
Claim 15
Dependent Claim
50 words
The method of claim 1, wherein the voltage applied to a column electrode at the beginning of alternate data output periods is greater than the reference value and the voltage applied to the column electrode is less than the reference value at the beginning of the other data output periods.
Claim 16
Dependent Claim
15 words
The method of claim 14, wherein the liquid crystal display is an active matrix display.
Claim 17
Dependent Claim
32 words
The method of claim 14, wherein a layer of liquid crystal material and a MIM device are electrically coupled, in series, between each intersection of a row electrode and a column electrode.
Claim 18
Dependent Claim
27 words
The method of claim 16, wherein the liquid crystal material is electrically coupled to the row electrode and the MIM is electrically coupled to the column electrode.
Claim 19
Dependent Claim
45 words
The method of claim 14, wherein a non-activating voltage is applied to the non-selected row electrodes during the data output period and the activating voltage applied to the selected row electrodes is of greater magnitude than the non-activating voltage applied to the other row electrodes.
Claim 20
Dependent Claim
13 words
The method of claim 14, wherein the scanning signals are all non-negative voltages.
Claim 21
Dependent Claim
13 words
The method of claim 14, wherein the scanning signals are all non-positive voltages.
Claim 22
Dependent Claim
25 words
The method of claim 14, wherein the effective voltage applied to a picture element switches polarity a plurality of times during a data output period.
Claim 23
Dependent Claim
24 words
The method of claim 14, wherein the effective voltage applied to a picture element switches polarity one time (N=1) during a data output period.
Claim 24
Dependent Claim
22 words
The method of claim 16, wherein the voltage applied to the column electrodes inverts one time (N=1) during a data output period.
Claim 25
Dependent Claim
71 words
The method of claim 1, wherein the display is capable of producing multiple grey levels of display contrast and the data signals applied to the column electrodes during a data output period is a combination of activating magnitude voltage and non-activating voltage and the grey level of the picture element is determined by the ratio of the interval of activating magnitude voltage to non-activating magnitude voltage during the data output period.
Claim 26
Dependent Claim
71 words
The method of claim 14, wherein the display is capable of producing multiple grey levels of display contrast and the data signals applied to the column electrodes during a data output period is a combination of activating magnitude voltage and non-activating voltage and the grey level of the picture element is determined by the ratio of the interval of activating magnitude voltage to non-activating magnitude voltage during the data output period.
Claim 27
Independent Claim
140 words
A method of activating a liquid crystal display including row electrodes and column electrodes with liquid crystal material therebetween and having picture elements at intersections between the row electrodes and column electrodes, comprising: applying data signal voltages of activating magnitude to column electrodes corresponding to selected picture elements during a data output period for activating a picture element; and applying one activating scanning voltage of activating magnitude successively to successive row electrodes, said activating scanning voltage corresponding to one of said data signal voltages and applying a non-activating scanning voltage of non-activating magnitude to a row electrodes at other times, the voltage applied to the column electrodes inverting N times during a single data output period, where N is a positive integer, so that the effective voltage at the picture element changes polarity N times during a data output period.
Claim 28
Independent Claim
140 words
A method of activating a liquid crystal display including row electrodes and column electrodes with liquid crystal material therebetween and having picture elements at intersections between the row electrodes and column electrodes, comprising: applying data signal voltages of activating magnitude to column electrodes corresponding to selected picture elements during a data output period for activating a picture element; and applying one activating scanning voltage of activating magnitude successively to successive row electrodes, said activating scanning voltage corresponding to one of said data signal voltages and applying a non-activating scanning voltage of non-activating magnitude to a row electrodes at other times, the voltage applied to the column electrodes inverting N times during a single data output period, where N is a positive integer, so that the effective voltage at the picture element changes polarity N times during a data output period.
Claim 29
Dependent Claim
31 words
The method of claim 26, wherein the signal voltage applied to the column electrodes switches from a first magnitude to a second magnitude N times during a signal data output period.
Claim 30
Dependent Claim
124 words
The method of claim 1, wherein the value of the voltage applied to the column electrodes can vary between 0 and a positive maximum voltage or between 0 and a negative maximum voltage, and the reference value is the mid-point voltage value between 0 and the positive maximum voltage or between 0 and the negative maximum voltage and the data signal voltage waveform applied to the column electrode inverts about the mid-point N times during a data output period, such that the value of the voltage applied to the column electrode crosses the mid-point voltage value and becomes the same magnitude of voltage from that mid-point value, for the same duration as before it crossed the mid-point, N times during a data output period.
Claim 31
Dependent Claim
60 words
The method of claim 1, wherein the voltage applied to a column electrode during one data output period includes a waveform including at least a first voltage followed by a second voltage of different magnitude and then waveform including the first and second voltages is inverted N times, said waveform applied and inverted N times during one data output period.
Claim 32
Dependent Claim
37 words
The method of claim 1, wherein the voltage waveform applied to a column electrode during a data output period is an inversion of the voltage waveform applied to the column electrodes during the next data output period.
Claim 33
Dependent Claim
47 words
The method of claim 1, wherein the value of the voltage applied to a column electrodes at the start of alternating data output periods is at the opposite side of the reference value compared to the voltage applied at the beginning of the other data output periods.
Claim 34
Dependent Claim
46 words
The method of claim 28, wherein the value of the voltage applied to a column electrodes at the beginning of alternating data output periods is at the opposite side of the midpoint compared to the voltage applied at the beginning of the other data output periods.
Claim 35
Dependent Claim
21 words
The method of claim 1 wherein the data output period is equal to 2N times the duration of the activating voltage.
Claim 36
Dependent Claim
21 words
The method of claim 26 wherein the data output period is equal to 2N times the duration of the activating voltage.
Claim 37
Dependent Claim
45 words
The method of claim 26, wherein a non-activating voltage is applied to the non-selected row electrodes during the data output period and the activating voltage applied to the selected row electrodes is of greater magnitude than the non-activating voltage applied to the other row electrodes.
Claim 38
Dependent Claim
21 words
The method of claim 26, wherein the data signal voltage and scanning voltage are all of non-negative voltage and non-positive voltage.
Claim 39
Dependent Claim
24 words
The method of claim 26, wherein the voltage applied to the column electrodes inverts a plurality of times during a single data output period.
Claim 40
Dependent Claim
23 words
The method of claim 26, wherein the voltage applied to the column electrodes inverts one time (N=1) during a single data output period.
Claim 41
Dependent Claim
71 words
The method of claim 26, wherein the display is capable of producing multiple grey levels of display contrast and the data signals applied to the column electrodes during a data output period is a combination of activating magnitude voltage and non-activating voltage and the grey level of the picture element is determined by the ratio of the interval of activating magnitude voltage to non-activating magnitude voltage during the data output period.
Claim 42
Dependent Claim
124 words
The method of claim 26, wherein the value of the voltage applied to the column electrodes can vary between 0 and a positive maximum voltage or between 0 and a negative maximum voltage, and a reference value is the mid-point voltage value between 0 and the positive maximum voltage or between 0 and the negative maximum voltage and the data signal voltage waveform applied to the column electrode inverts about the mid-point N times during a data output period, such that the value of the voltage applied to the column electrode crosses the mid-point voltage value and becomes the same magnitude of voltage from that mid-point value, for the same duration as before it crossed the mid-point, N times during a data output period.
Claim 43
Dependent Claim
60 words
The method of claim 26, wherein the voltage applied to a column electrode during one data output period includes a waveform including at least a first voltage followed by a second voltage of different magnitude and then waveform including the first and second voltages is inverted N times, said waveform applied and inverted N times during one data output period.
Claim 44
Dependent Claim
47 words
The method of claim 40, wherein the value of the voltage applied to a column electrode at the start of alternating data output periods is at the opposite side of the reference value compared to the voltage applied at the beginning of the other data output periods.
Claim 45
Dependent Claim
41 words
The method of claim 26, wherein the liquid crystal display is an active matrix display and a layer of liquid crystal material and an active element are coupled in series between each intersection of a row electrode and a column electrode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |