US5119085A
Expired / Lapsed
US
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Driving method for a liquid crystal panel
Assignee: Seiko Epson Corp
•
Filing: 1991-02-05
•
Granted: 1992-06-02
•
Expires: 2011-02-05
Abstract
Abstract A liquid crystal display device for producing a substantially uniform tone pattern by placing in the same display state all display dots producing the tone pattern which are associated with the same scanning electrode during each frame of a cycle. The method further includes adjusting the scanning waveform applied to each scanning electrode during each frame based on the tone pattern. Alternatively, the liquid crystal display device places all display dots which produce the tone pattern in the lit state for the same duration of time during the cycle and concurrently adjusts the scanning waveform applied to each scanning electrode during the cycle based on the tone pattern. Different groups of display dots which produce the tone pattern are placed in the non-lit display state at different portions of the cycle. Voltage disturbances giving rise to spikes and rounding of the voltage pulses occuring on the scanning and signal electrodes are substantially eliminated.
Inventors
- 👤 Katsunori Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:16
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127; G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3674; G09G3/3681; G09G3/3696; G09G2300/00; G09G2300/02; G09G2300/023; G09G2320/00; G09G2320/02; G09G2320/0209; G09G2320/0233; G09G2320/0247; G09G2320/04; G09G2320/041; G09G3/3614
Claims Analysis
Total Claims: 83
Claim 1
Independent Claim
164 words
A method for driving a liquid crystal display device for producing a tone pattern, said display device including a plurality of signal electrodes overlapping a plurality of scanning electrodes and a plurality of display dots arranged in a matrix of rows and columns in which each display dot corresponds to the overlapping of one of the plurality of signal electrodes with one of the plurality of scanning electrodes, said method including driving each display dot into a lit or non-lit display state during each frame of an at least two frame cycle based on a scanning waveform and signal waveform being applied to the associated scanning electrode and signal electrode, respectively, and further comprising the steps of: placing in the same display state all display dots producing the tone pattern which are associated with the same scanning electrode during one frame of the cycle; and concurrently adjusting the scanning waveform applied to each scanning electrode during said one frame based on the tone pattern.
Claim 2
Independent Claim
164 words
A method for driving a liquid crystal display device for producing a tone pattern, said display device including a plurality of signal electrodes overlapping a plurality of scanning electrodes and a plurality of display dots arranged in a matrix of rows and columns in which each display dot corresponds to the overlapping of one of the plurality of signal electrodes with one of the plurality of scanning electrodes, said method including driving each display dot into a lit or non-lit display state during each frame of an at least two frame cycle based on a scanning waveform and signal waveform being applied to the associated scanning electrode and signal electrode, respectively, and further comprising the steps of: placing in the same display state all display dots producing the tone pattern which are associated with the same scanning electrode during one frame of the cycle; and concurrently adjusting the scanning waveform applied to each scanning electrode during said one frame based on the tone pattern.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein the steps of claim 1 are repeated for each frame of the cycle.
Claim 4
Dependent Claim
26 words
The method of claim 1, wherein the scanning waveform includes a first voltage group and a second voltage group which are alternately applied during each cycle.
Claim 5
Dependent Claim
65 words
The method of claim 3, wherein the cycle includes a first frame and a second frame and further including applying the first voltage group to the scanning electrodes during a first portion of the first frame and a last portion of the second frame and the second voltage group during the last portion of the first frame and the first portion of the second frame.
Claim 6
Dependent Claim
78 words
The method of claim 4, further including applying the scanning waveform during an additional cycle which includes a third frame and a fourth frame wherein the second voltage group is applied to the scanning electrodes during the first portion of the third frame and the last portion of the fourth frame and th first voltage group is applied to the scanning electrodes during the last portion of the third frame and the first portion of the fourth frame.
Claim 7
Dependent Claim
14 words
The method of claim 5, wherein the cycle and additional cycles are alternately repeated.
Claim 8
Dependent Claim
19 words
The method of claim 1, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 9
Dependent Claim
19 words
The method of claim 3, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 10
Dependent Claim
25 words
The method of claim 8, wherein the step of adjusting also occurs when the scanning waveform changes from one voltage group to another voltage group.
Claim 11
Dependent Claim
76 words
The method of claim 1, wherein the step of adjusting is based on a value selected from a pair of parameters I and F, where: I=Y.sub.i lit -Y.sub.i+1 lit F=(Y.sub.i lit +Y.sub.i+1 lit)-X where Y i lit is the number of display dots currently lit on a selected scanning electrode Y i+1 lit is the number of display dots to be lit on the next selected scanning electrode X is the total number of signal electrodes.
Claim 12
Dependent Claim
40 words
The method of claim 10, wherein the step of adjusting includes adding compensating voltages to the scanning waveform, the compensating voltages being based on the magnitude and polarity of the value selected from the pair of parameters I and F.
Claim 13
Dependent Claim
69 words
The method of claim 11, wherein the scanning waveform includes a first voltage group and a second voltage group which are alternately applied during each cycle and which are polarity inversions of each other and wherein the value F is selected when the scanning waveform changes from one voltage group to another voltage group and the value of I is selected when the voltage of the signal waveform changes.
Claim 14
Dependent Claim
26 words
The method of claim 2, wherein the scanning waveform includes a first voltage group and a second voltage group which are alternately applied during each cycle.
Claim 15
Dependent Claim
65 words
The method of claim 13, wherein the cycle includes a first frame and a second frame and further including applying the first voltage group to the scanning electrodes during the first portion of the first frame and the last portion of the second frame and the second voltage group during the last portion of the first frame and the first portion of the second frame.
Claim 16
Dependent Claim
78 words
The method of claim 14, further including applying the scanning waveform during an additional cycle which includes a third frame and a fourth frame wherein the second voltage group is applied to the scanning electrodes during the first portion of the third frame and the last portion of the fourth frame and the first voltage group is applied to the scanning electrodes during the last portion of the third frame and the first portion of the fourth frame.
Claim 17
Dependent Claim
14 words
The method of claim 15, wherein the cycle and additional cycles are alternately repeated.
Claim 18
Dependent Claim
19 words
The method of claim 2, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 19
Dependent Claim
19 words
The method of claim 4, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 20
Dependent Claim
25 words
The method of claim 18, wherein the step of adjusting also occurs when the scanning waveform changes from one voltage group to another voltage group.
Claim 21
Dependent Claim
19 words
The method of claim 5, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 22
Dependent Claim
25 words
The method of claim 20, wherein the step of adjusting also occurs when the scanning waveform changes from one voltage group to another voltage group.
Claim 23
Dependent Claim
19 words
The method of claim 6, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 24
Dependent Claim
25 words
The method of claim 22, wherein the step of adjusting also occurs when the scanning waveform changes from one voltage group to another voltage group.
Claim 25
Dependent Claim
76 words
The method of claim 3, wherein the step of adjusting is based on a value selected from a pair of parameters I and F, where: I=Y.sub.i lit -Y.sub.i+1 lit F=(Y.sub.i lit +Y.sub.i+1 lit)-X where Y i lit is the number of display dots currently lit on a selected scanning electrode Y i+1 lit is the number of display dots to be lit on the next selected scanning electrode X is the total number of signal electrodes.
Claim 26
Dependent Claim
40 words
The method of claim 24, wherein the step of adjusting includes adding compensating voltages to the scanning waveform, the compensating voltages being based on the magnitude and polarity of the value selected from the pair of parameters I and F.
Claim 27
Dependent Claim
39 words
The method of claim 25, wherein the value F is selected when the scanning waveform changes from one voltage group to another voltage group and the value of I is selected when the voltage of the signal waveform changes.
Claim 28
Dependent Claim
76 words
The method of claim 4, wherein the step of adjusting is based on a value selected from a pair of parameters I and F, where: I=Y.sub.i lit -Y.sub.i+1 lit F=(Y.sub.i lit +Y.sub.i+1 lit)-X where Y i lit is the number of display dots currently lit on a selected scanning electrode Y i+1 lit is the number of display dots to be lit on the next selected scanning electrode X is the total number of signal electrodes.
Claim 29
Dependent Claim
40 words
The method of claim 27, wherein the step of adjusting includes adding compensating voltages to the scanning waveform, the compensating voltages being based on the magnitude and polarity of the value selected from the pair of parameters I and F.
Claim 30
Dependent Claim
39 words
The method of claim 28, wherein the value F is selected when the scanning waveform changes from one voltage group to another voltage group and the value of I is selected when the voltage of the signal waveform changes.
Claim 31
Dependent Claim
76 words
The method of claim 5, wherein the step of adjusting is based on a value selected from a pair of parameters I and F, where: F=(Y.sub.i lit -Y.sub.i+1 lit F=(Y.sub.i lit +Y.sub.i+1 lit)-X where Y i lit is the number of display dots currently lit on a selected scanning electrode Y i+1 lit is the number of display dots to be lit on the next selected scanning electrode X is the total number of signal electrodes.
Claim 32
Dependent Claim
40 words
The method of claim 30, wherein the step of adjusting includes adding compensating voltages to the scanning waveform, the compensating voltages being based on the magnitude and polarity of the value selected from the pair of parameters I and F.
Claim 33
Dependent Claim
39 words
The method of claim 31, wherein the value F is selected when the scanning waveform changes from one voltage group to another voltage group and the value of I is selected when the voltage of the signal waveform changes.
Claim 34
Dependent Claim
19 words
The method of claim 3, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 35
Dependent Claim
34 words
The method of claim 7, wherein the step of adjusting occurs when the voltage of the signal waveform changes from a lit to a non-lit level or from a non-lit to a lit level.
Claim 36
Dependent Claim
19 words
The method of claim 6, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 37
Dependent Claim
19 words
The method of claim 7, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 38
Dependent Claim
34 words
The method of claim 9, wherein the step of adjusting occurs when the voltage of the signal waveform changes from a lit to a non-lit level or from a non-lit to a lit level.
Claim 39
Dependent Claim
19 words
The method of claim 37, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 40
Dependent Claim
19 words
The method of claim 16, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 41
Dependent Claim
34 words
The method of claim 39, wherein the step of adjusting occurs when the voltage of the signal waveform changes from a lit to a non-lit level or from a non-lit to a lit level.
Claim 42
Dependent Claim
19 words
The method of claim 23, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 43
Dependent Claim
34 words
The method of claim 41, wherein the step of adjusting occurs when the voltage of the signal waveform changes from a lit to a non-lit level or from a non-lit to a lit level.
Claim 44
Dependent Claim
19 words
The method of claim 32, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 45
Dependent Claim
34 words
The method of claim 43, wherein the step of adjusting occurs when the voltage of the signal waveform changes from a lit to a non-lit level or from a non-lit to a lit level.
Claim 46
Independent Claim
182 words
A method for driving a liquid crystal display device for producing a tone pattern, said display device including a plurality of signal electrodes overlapping a plurality of scanning electrodes and a plurality of display dots arranged in a matrix of rows and columns in which each display dot corresponds to the overlapping of one of the plurality of signal electrodes with one of the plurality of scanning electrodes, said method including driving each display dot into a lit or non-lit display state during each frame of an at least two frame cycle based on a scanning waveform and signal waveform being applied to the associated scanning electrode and signal electrode, respectively, and further comprising the steps of: placing all display dots which produce the tone pattern in the lit state for the same duration of time during the cycle; and concurrently adjusting the scanning waveform applied to each scanning electrode during the cycle based on the tone pattern; wherein different groups of display dots which produce the tone pattern are placed in the non-lit display state at different portions of the cycle.
Claim 47
Independent Claim
182 words
A method for driving a liquid crystal display device for producing a tone pattern, said display device including a plurality of signal electrodes overlapping a plurality of scanning electrodes and a plurality of display dots arranged in a matrix of rows and columns in which each display dot corresponds to the overlapping of one of the plurality of signal electrodes with one of the plurality of scanning electrodes, said method including driving each display dot into a lit or non-lit display state during each frame of an at least two frame cycle based on a scanning waveform and signal waveform being applied to the associated scanning electrode and signal electrode, respectively, and further comprising the steps of: placing all display dots which produce the tone pattern in the lit state for the same duration of time during the cycle; and concurrently adjusting the scanning waveform applied to each scanning electrode during the cycle based on the tone pattern; wherein different groups of display dots which produce the tone pattern are placed in the non-lit display state at different portions of the cycle.
Claim 48
Dependent Claim
26 words
The method of claim 45, wherein the scanning waveform includes a first voltage group and a second voltage group which are alternately applied during each cycle.
Claim 49
Dependent Claim
65 words
The method of claim 46, wherein the cycle includes a first frame and a second frame and further including applying the first voltage group to the scanning electrodes during a first portion of the first frame and a last portion of the second frame and the second voltage group during the last portion of the first frame and the first portion of the second frame.
Claim 50
Dependent Claim
78 words
The method of claim 47, further including applying the scanning waveform during an additional cycle which includes a third frame and a fourth frame wherein the second voltage group is applied to the scanning electrodes during the first portion of the third frame and the last portion of the fourth frame and the first voltage group is applied to the scanning electrodes during the last portion of the third frame and the first portion o the fourth frame.
Claim 51
Dependent Claim
14 words
The method of claim 48, wherein the cycle and additional cycles ar alternately repeated.
Claim 52
Dependent Claim
19 words
The method of claim 45, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 53
Dependent Claim
25 words
The method of claim 50, wherein the step of adjusting also occurs when the scanning waveform changes from one voltage group to another voltage group.
Claim 54
Dependent Claim
76 words
The method of claim 45, wherein the step of adjusting is based on a value selected from a pair of parameters I and F, where: I=Y.sub.i lit -Y.sub.i+1 lit F=(Y.sub.i lit +Y.sub.i+1 lit)-X where Y i lit is the number of display dots currently lit on a selected scanning electrode Y i+1 lit is the number of display dots to be lit on the next selected scanning electrode X is the total number of signal electrodes.
Claim 55
Dependent Claim
40 words
The method of claim 52, wherein the step of adjusting includes adding compensating voltages to the scanning waveform, the compensating voltages being based on the magnitude and polarity of the value selected from the pair of parameters I and F.
Claim 56
Dependent Claim
69 words
The method of claim 53, wherein the scanning waveform includes a first voltage group and a second voltage group which are alternately applied during each cycle and which are polarity inversions of each other and wherein the value F is selected when the scanning waveform changes from one voltage group to another voltage group and the value of I is selected when the voltage of the signal waveform changes.
Claim 57
Dependent Claim
19 words
The method of claim 47, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 58
Dependent Claim
25 words
The method of claim 55, wherein the step of adjusting also occurs when the scanning waveform changes from one voltage group to another voltage group.
Claim 59
Dependent Claim
19 words
The method of claim 48, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 60
Dependent Claim
25 words
The method of claim 57, wherein the step of adjusting also occurs when the scanning waveform changes from one voltage group to another voltage group.
Claim 61
Dependent Claim
19 words
The method of claim 49, wherein the step of adjusting occurs when the voltage of the signal waveform changes.
Claim 62
Dependent Claim
25 words
The method of claim 59, wherein the step of adjusting also occurs when the scanning waveform changes from one voltage group to another voltage group.
Claim 63
Dependent Claim
76 words
The method of claim 46, wherein the step of adjusting is based on a value selected from a pair of parameters I and F, where: I=Y.sub.i lit -Y.sub.i+1 lit F=(Y.sub.i lit +Y.sub.i+1 lit)-X where Y i+1 lit is the number of display dots currently lit on a selected scanning electrode Y i+1 lit is the number of display dots to be lit on the next selected scanning electrode X is the total number of signal electrodes.
Claim 64
Dependent Claim
40 words
The method of claim 61, wherein the step of adjusting includes adding compensating voltages to the scanning waveform, the compensating voltages being based on the magnitude and polarity of the value selected from the pair of parameters I and F.
Claim 65
Dependent Claim
39 words
The method of claim 62, wherein the value F is selected when the scanning waveform changes from one voltage group to another voltage group and the value of I is selected when the voltage of the signal waveform changes.
Claim 66
Dependent Claim
76 words
The method of claim 47, wherein the step of adjusting is based on a value selected from a pair of parameters I and F, where: F=(Y.sub.i lit -Y.sub.i+1 lit F=(Y.sub.i lit +Y.sub.i+1 lit)-X where Y i lit is the number of display dots currently lit on a selected scanning electrode Y i+1 lit is the number of display dots to be lit on the next selected scanning electrode X is the total number of signal electrodes.
Claim 67
Dependent Claim
40 words
The method of claim 64, wherein the step of adjusting includes adding compensating voltages to the scanning waveform, the compensating voltages being based on the magnitude and polarity of the value selected from the pair of parameters I and F.
Claim 68
Dependent Claim
39 words
The method of claim 65, wherein the value F is selected when the scanning waveform changes from one voltage group to another voltage group and the value of I is selected when the voltage of the signal waveform changes.
Claim 69
Dependent Claim
76 words
The method of claim 48, wherein the step of adjusting is based on a value selected from a pair of parameters I and F, where: I=Y.sub.i lit -Y.sub.i+1 lit F=(Y.sub.i lit +Y.sub.i+1 lit)-X where Y i lit is the number of display dots currently lit on a selected scanning electrode Y i+1 lit is the number of display dots to be lit on the next selected scanning electrode X is the total number of signal electrodes.
Claim 70
Dependent Claim
40 words
The method of claim 67, wherein the step of adjusting includes adding compensating voltages to the scanning waveform, the compensating voltages being based on the magnitude and polarity of the value selected from the pair of parameters I and F.
Claim 71
Dependent Claim
39 words
The method of claim 68, wherein the value F is selected when the scanning waveform changes from one voltage group to another voltage group and the value of I is selected when the voltage of the signal waveform changes.
Claim 72
Dependent Claim
19 words
The method of claim 46, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 73
Dependent Claim
34 words
The method of claim 50, wherein the step of adjusting occurs when the voltage of the signal waveform changes from a lit to a non-lit level or from a non-lit to a lit level.
Claim 74
Dependent Claim
19 words
The method of claim 49, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 75
Dependent Claim
19 words
The method of claim 50, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 76
Dependent Claim
34 words
The method of claim 51, wherein the step of adjusting occurs when the voltage of the signal waveform changes from a lit to a non-lit level or from a non-lit to a lit level.
Claim 77
Dependent Claim
19 words
The method of claim 74, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 78
Dependent Claim
19 words
The method of claim 60, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 79
Dependent Claim
34 words
The method of claim 76, wherein the step of adjusting occurs when the voltage of the signal waveform changes from a lit to a non-lit level or from a non-lit to a lit level.
Claim 80
Dependent Claim
19 words
The method of claim 69, wherein the first voltage group is a polarity inversion of the second voltage group.
Claim 81
Dependent Claim
34 words
The method of claim 78, wherein the step of adjusting occurs when the voltage of the signal waveform changes from a lit to a non-lit level or from a non-lit to a lit level.
Claim 82
Dependent Claim
21 words
The method of claim 47, wherein the first portion and last portion of each frame are equal to half the frame.
Claim 83
Dependent Claim
21 words
The method of claim 48, wherein the first portion and last portion of each frame are equal to half the frame.
References Cited (Backward Citations)
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