US5093736A
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US
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Time-sharing addressing driving means for a super twisted liquid crystal display device
Assignee: AMPAC ENTERPRISES Inc A CORP OF
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Filing: 1991-02-20
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Granted: 1992-03-03
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Expires: 2011-02-20
Abstract
Abstract A liquid crystal display device including a nematic liquid crystal material twisted between about 180° to 360° is driven by the time-sharing addressing technique at a driving waveform less than 2√N·V with a bias ratio of between about 1/(√N-N/200) and 1/(√N-N/50) where N≧300 to realize improved contrast and faster response speeds.
Inventors
- 👤 Chiyoaki Iijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:06
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G2320/00; G09G2320/02; G09G2320/0209
Claims Analysis
Total Claims: 66
Claim 1
Independent Claim
73 words
A liquid crystal display device comprising: a liquid crystal cell including a pair of spaced apart electrode substrates and nematic liquid crystal material filling the space between the substrates, said material having a twist angle ranging from about 180° to 360°; and time-sharing addressing driving means having a duty ratio of about 1/N N≧300) and for applying a driving waveform having a bias ratio at least equal to or greater than about 1/(√N-N/200).
Claim 2
Dependent Claim
73 words
A liquid crystal display device comprising: a liquid crystal cell including a pair of spaced apart electrode substrates and nematic liquid crystal material filling the space between the substrates, said material having a twist angle ranging from about 180° to 360°; and time-sharing addressing driving means having a duty ratio of about 1/N N≧300) and for applying a driving waveform having a bias ratio at least equal to or greater than about 1/(√N-N/200).
Claim 3
Dependent Claim
92 words
The liquid crystal display device of claim 1, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein said time-sharing addressing driving means includes a first time-sharing addressing driving means for applying a first voltage waveform having a duty ratio of about 1/N to said first electrodes and a second time-sharing addressing driving means for applying a second voltage waveform having a bias ratio at least equal to or greater than about 1/(√N-N/200) to said second electrodes.
Claim 4
Dependent Claim
20 words
The liquid crystal display device of claim 1, wherein the bias ratio is equal to or less than about 1/(√N-N/50).
Claim 5
Dependent Claim
20 words
The liquid crystal display device of claim 1, wherein the bias ratio is equal to or greater than about 1/(√N-N/150).
Claim 6
Dependent Claim
20 words
The liquid crystal display device of claim 4, wherein the bias ratio is equal to or less than about 1/(√N-N/75).
Claim 7
Dependent Claim
25 words
The liquid crystal display device of claim 2, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 8
Dependent Claim
26 words
The liquid crystal display device of claim 2, further including a pair of polarizing plates disposed on the outer sides of the first and second substrates.
Claim 9
Dependent Claim
39 words
The liquid crystal display device of claim 2, wherein said second time-sharing addressing driving means applies a second voltage waveform to each of said second electrodes when said first voltage waveform is applied to one of said first electrodes.
Claim 10
Dependent Claim
32 words
The liquid crystal display device of claim 8, wherein said nematic liquid crystal material has a th.reshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 11
Dependent Claim
20 words
The liquid crystal display device of claim 3, wherein the bias ratio is equal to or greater than about 1/(√N-N/150).
Claim 12
Dependent Claim
20 words
The liquid crystal display device of claim 1, wherein the bias ratio is equal to or less than about 1/(√N-N/75).
Claim 13
Dependent Claim
92 words
The liquid crystal display device of claim 3, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein said time-sharinq addressing driving means includes a first time-sharing addressing driving means for applying a first voltage waveform having a duty ratio of about 1/N to said first electrodes and a second time-sharing addressing driving means for applying a second voltage waveform having a bias ratio at least equal to or greater than about 1/(√N-N/200) to said second electrodes.
Claim 14
Dependent Claim
25 words
The liquid crystal display device of claim 12, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 15
Dependent Claim
92 words
The liquid crystal display device of claim 4, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein said time-sharing addressing driving means includes a first time-sharing addressing driving means for applying a first voltage waveform having a duty ratio of about 1/N to said first electrodes and a second time-sharing addressing driving means for applying a second voltage waveform having a bias ratio at least equal to or greater than about 1/(√N-N/200) to said second electrodes.
Claim 16
Dependent Claim
25 words
The liquid crystal display device of claim 14, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 17
Dependent Claim
92 words
The liquid crystal display device of claim 5, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein said time-sharing addressing driving means includes a first time-sharing addressing driving means for applying a first voltage waveform having a duty ratio of about 1/N to said first electrodes and a second time-sharing addressing driving means for applying a second voltage waveform having a bias ratio at least equal to or greater than about 1/(√N-N/200) to said second electrodes.
Claim 18
Dependent Claim
25 words
The liquid crystal display device of claim 16, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 19
Dependent Claim
92 words
The liquid crystal display device of claim 10, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein said time-sharing addressing driving means includes a first time-sharing addressing driving means for applying a first voltage waveform having a duty ratio of about 1/N to said first electrodes and a second time-sharing addressing driving means for applying a second voltage waveform having a bias ratio at least equal to or greater than about 1/(√N-N/200) to said second electrodes.
Claim 20
Dependent Claim
25 words
The liquid crystal display device of claim 18, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 21
Dependent Claim
92 words
The liquid crystal display device of claim 11, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein said time-sharing addressing driving means includes a first time-sharing addressing driving means for applying a first voltage waveform having a duty ratio of about 1/N to said first electrodes and a second time-sharing addressing driving means for applying a second voltage waveform having a bias ratio at least equal to or greater than about 1/(√N-N/200) to said second electrodes.
Claim 22
Dependent Claim
25 words
The liquid crystal display device of claim 20, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 23
Dependent Claim
39 words
The liquid crystal display device of claim 12, wherein said second time-sharing addressing driving means applies a second voltage waveform to each of said second electrodes when said first voltage waveform is applied to one of said first electrodes.
Claim 24
Dependent Claim
32 words
The liquid crystal display device of claim 22, wherein said nematic liquid crystal material has a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 25
Dependent Claim
39 words
The liquid crystal display device of claim 16, wherein said second time-sharing addressing driving means applies a second voltage waveform to each of said second electrodes when said first voltage waveform is applied to one of said first electrodes.
Claim 26
Dependent Claim
32 words
The liquid crystal display device of claim 24, wherein said nematic liquid crystal material has a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 27
Dependent Claim
39 words
The liquid crystal display device of claim 6, wherein said second time-sharing addressing driving means applies a second voltage waveform to each of said second electrodes when said first voltage waveform is applied to one of said first electrodes.
Claim 28
Dependent Claim
32 words
The liquid crystal display device of claim 26, wherein said nematic liquid crystal material has a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 29
Dependent Claim
39 words
The liquid crystal display device of claim 17, wherein said second time-sharing addressing driving means applies a second voltage waveform to each of said second electrodes when said first voltage waveform is applied to one of said first electrodes.
Claim 30
Dependent Claim
32 words
The liquid crystal display device of claim 28, wherein said nematic liquid crystal material has a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 31
Dependent Claim
28 words
The liquid crystal display device of claim wherein the nematic liquid crystal material is a composition of multiple compounds having a response speed of less than 500 ms.
Claim 32
Dependent Claim
91 words
A liquid crystal display device comprising: a liquid crystal cell including a pair of spaced apart electrode substrates and nematic liquid crystal material filling the space between the substrates, said material having a twist angle ranging from about 180° to 360°; a pair of polarizing plates disposed on the outer sides of the liquid crystal cell; and time-sharing addressing driving means having a duty ratio of about 1/N (N≧300) and for applying a driving waveform having a bias ratio between about 1/(√N-N/200) and 1/(√N-N/50) and an amplitude less than 2√N volts.
Claim 33
Dependent Claim
91 words
A liquid crystal display device comprising: a liquid crystal cell including a pair of spaced apart electrode substrates and nematic liquid crystal material filling the space between the substrates, said material having a twist angle ranging from about 180° to 360°; a pair of polarizing plates disposed on the outer sides of the liquid crystal cell; and time-sharing addressing driving means having a duty ratio of about 1/N (N≧300) and for applying a driving waveform having a bias ratio between about 1/(√N-N/200) and 1/(√N-N/50) and an amplitude less than 2√N volts.
Claim 34
Dependent Claim
92 words
The liquid crystal display device of claim 31, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein said time-sharing addressing driving means includes a first time-sharing addressing driving means for applying a first voltage waveform having a duty ratio of about 1/N to said first electrodes and a second time-sharing addressing driving means for applying a second voltage waveform having a bias ratio at least equal to or greater than about 1/(√N-N/200) to said second electrodes.
Claim 35
Dependent Claim
39 words
The liquid crystal display device of claim 32, wherein said second time-sharing addressing driving means applies a second voltage waveform to each of said second electrodes when said first voltage waveform is applied to one of said first electrodes.
Claim 36
Dependent Claim
32 words
The liquid crystal display device of claim 33, wherein said nematic liquid crystal material has a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 37
Independent Claim
83 words
A method of driving a liquid crystal display device, said liquid crystal display device including a liquid crystal cell including a pair of spaced apart electrode substrate's and nematic liquid crystal material filling the space between the substrates, said material having a twist angle ranging from about 180° to 360°, said method comprising the steps of: applying to the electrode substrates at a duty ratio of 1/N (N≧300) a voltage having a bias ratio at least equal to or greater than about 1/(√N-N/200).
Claim 38
Independent Claim
83 words
A method of driving a liquid crystal display device, said liquid crystal display device including a liquid crystal cell including a pair of spaced apart electrode substrate's and nematic liquid crystal material filling the space between the substrates, said material having a twist angle ranging from about 180° to 360°, said method comprising the steps of: applying to the electrode substrates at a duty ratio of 1/N (N≧300) a voltage having a bias ratio at least equal to or greater than about 1/(√N-N/200).
Claim 39
Dependent Claim
17 words
The method of claim 35, wherein the bias ratio is equaI to or less than about 1/(√N-N/50).
Claim 40
Dependent Claim
17 words
The method of claim 35, wherein the bias ratio is equal to or greater than about 1/(√N-N/150).
Claim 41
Dependent Claim
17 words
The method of claim 37, wherein the bias ratio is equal to or less than about 1/(√N-N/75).
Claim 42
Dependent Claim
59 words
The method of claim 35, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein the duty ratio is applied to said first electrodes with a first voltage waveform and the bias ratio is applied to said second electrodes with a second voltage waveform.
Claim 43
Dependent Claim
22 words
The method of claim 39, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 44
Dependent Claim
17 words
The method of claim 36, wherein the bias ratio is equal to or greater than about 1(√N-N/150).
Claim 45
Dependent Claim
17 words
The method of claim 35, wherein the bias ratio is equal to or less than about 1/(√N-N/75).
Claim 46
Dependent Claim
59 words
The method of claim 36, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein the duty ratio is applied to said first electrodes with a first voltage waveform and the bias ratio is applied to said second electrodes with a second voltage waveform.
Claim 47
Dependent Claim
22 words
The method of claim 43, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 48
Dependent Claim
59 words
The method of claim 37, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein the duty ratio is applied to said first electrodes with a first voltage waveform and the bias ratio is applied to said second electrodes with a second voltage waveform.
Claim 49
Dependent Claim
22 words
The method of claim 45, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 50
Dependent Claim
59 words
The method of claim 38, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein the duty ratio is applied to said first electrodes with a first voltage waveform and the bias ratio is applied to said second electrodes with a second voltage waveform.
Claim 51
Dependent Claim
22 words
The method of claim 47, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 52
Dependent Claim
59 words
The method of claim 41, wherein the pair of spaced apart electrode substrates includes a first substrate having N first electrodes and a second substrate having second electrodes, and wherein the duty ratio is applied to said first electrodes with a first voltage waveform and the bias ratio is applied to said second electrodes with a second voltage waveform.
Claim 53
Dependent Claim
22 words
The method of claim 49, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 54
Dependent Claim
58 words
The method of claim 42, wherein the pair of spaced apart electrode substrates includes first substrate having N first electrodes and a second substrate having second electrodes, and wherein the duty ratio is applied to said first electrodes with a first voltage waveform and the bias ratio is applied to said second electrodes with a second voltage waveform.
Claim 55
Dependent Claim
22 words
The method of claim 51, wherein the second voltage waveform serves as the driving waveform having an amplitude less than 2√N volts.
Claim 56
Dependent Claim
31 words
The method of claim 39, further including applying said second voltage waveform to each of said second electrodes when the first voltage waveform is applied to one of said first electrodes.
Claim 57
Dependent Claim
31 words
The method of claim 53, further including selecting a nematic liquid crystal material having a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 58
Dependent Claim
31 words
The method of claim 45, further including applying said second voltage waveform to each of said second electrodes when the first voltage waveform is applied to one of said first electrodes.
Claim 59
Dependent Claim
31 words
The method of claim 55, further including selecting a nematic liquid crystal material having a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 60
Dependent Claim
31 words
The method of claim 40, further including applying said second voltage waveform to each of said second electrodes when the first voltage waveform is applied to one of said first electrodes.
Claim 61
Dependent Claim
31 words
The method of claim 57, further including selecting a nematic liquid crystal material having a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 62
Dependent Claim
31 words
The method of claim 41, further including applying said second voltage waveform to each of said second electrodes when the first voltage waveform is applied to one of said first electrodes.
Claim 63
Dependent Claim
31 words
The method of claim 59, further including selecting a nematic liquid crystal material having a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 64
Dependent Claim
31 words
The method of claim 50, further including applying said second voltage waveform to each of said second electrodes when the first voltage waveform is applied to one of said first electrodes.
Claim 65
Dependent Claim
31 words
The method of claim 61, further including selecting a nematic liquid crystal material having a threshold level at least equal to or greater than an effective value of about 1.8 volts.
Claim 66
Dependent Claim
29 words
The method of claim 35, further including selecting a nematic liquid crystal material which is a composition of multiple compounds having a response speed of less than 500 ms.
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