Patent US5353141A successfully refreshed from Google Patents.
US5353141A
Expired / Lapsed
US
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Method for aligning treatment of liquid crystal device including varying with time the feeding speed of the rubbing roller
Assignee: Canon Inc
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Filing: 1992-10-05
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Granted: 1994-10-04
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Expires: 2012-10-05
Abstract
Abstract A liquid crystal device, particularly a ferroelectric liquid crystal device, is constituted by disposing a liquid crystal disposed between a pair of rubbing-treated substrates. The uniaxial alignment control force exerted by rubbing is gradually weakened as the rubbing treatment is successively applied to a large number of substrates. This is compensated by varying a rubbing condition, such as a relative moving speed, a rotational speed, or a pressing depth against the substrate of a rubbing roller. Alternatively, such a change in uniaxial alignment control force with time may be utilized for compensating for a difference in uniaxial alignment control force attributable to a difference in stripe electrode extension relative to the rubbing direction.
Inventors
- 👤 Kenji Onuma
- 👤 Mayumi Yoshioka
- 👤 Yukio Hanyu
- 👤 Yasuto Kodera
- 👤 Takatsugu Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:46
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/13378; G02F1/133784
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
56 words
An aligning treatment method for a liquid crystal device including a liquid crystal between a pair of substrates, comprising successively rubbing a plurality of substrates with a rubbing roller while varying a feeding speed of the rubbing roller with time, wherein the feeding speed of the rubbing roller is varied by at least 0.5% per substrate.
Claim 2
Dependent Claim
56 words
An aligning treatment method for a liquid crystal device including a liquid crystal between a pair of substrates, comprising successively rubbing a plurality of substrates with a rubbing roller while varying a feeding speed of the rubbing roller with time, wherein the feeding speed of the rubbing roller is varied by at least 0.5% per substrate.
Claim 3
Dependent Claim
56 words
An aligning treatment method for a liquid crystal device including a liquid crystal between a pair of substrates, comprising successively rubbing a plurality of substrates with a rubbing roller while varying a feeding speed of the rubbing roller with time, wherein the feeding speed of the rubbing roller is varied by at least 1% per substrate.
Claim 4
Dependent Claim
56 words
An aligning treatment method for a liquid crystal device including a liquid crystal between a pair of substrates, comprising successively rubbing a plurality of substrates with a rubbing roller while varying a feeding speed of the rubbing roller with time, wherein the feeding speed of the rubbing roller is varied by at least 1% per substrate.
Claim 5
Dependent Claim
28 words
A method according to claim 1 or 2, wherein a rotational speed and/or a pressing depth against the substrate of the rubbing roller is additionally varied with time.
Claim 6
Dependent Claim
20 words
A method according to claim 3, wherein the rubbing roller pressing depth is varied by at least 1% per substrate.
Claim 7
Dependent Claim
17 words
A method according to claim 1 or 2, wherein said liquid crystal is a ferroelectric liquid crystal.
Claim 8
Dependent Claim
26 words
A method according to claim 5, wherein the substrates are rubbed to align the ferroelectric liquid crystal at a pretilt angle of at least 10 degrees.
Claim 9
Dependent Claim
19 words
A method according to claim 1 or 2, wherein the feeding speed of the rubbing roller is varied stepwise.
Claim 10
Dependent Claim
19 words
A method according to claim 1 or 2, wherein the feeding speed of the rubbing roller is varied linearly.
Claim 11
Dependent Claim
109 words
An alignment treatment method for a liquid crystal device including a pair of substrates each provided with stripe electrodes and a liquid crystal disposed between the substrates; the method comprising rubbing the pair of substrates with a rubbing roller such that one substrate having stripe electrodes extending in a direction perpendicular to the rubbing direction is rubbed first, and then the other substrate having stripe electrodes extending in a direction parallel to the rubbing direction is rubbed, wherein the rubbing is repeated while varying a feeding speed of the rubbing roller with time, and a feeding speed of the rubbing roller is varied by at least 0.5% per substrate.
Claim 12
Dependent Claim
109 words
An alignment treatment method for a liquid crystal device including a pair of substrates each provided with stripe electrodes and a liquid crystal disposed between the substrates; the method comprising rubbing the pair of substrates with a rubbing roller such that one substrate having stripe electrodes extending in a direction perpendicular to the rubbing direction is rubbed first, and then the other substrate having stripe electrodes extending in a direction parallel to the rubbing direction is rubbed, wherein the rubbing is repeated while varying a feeding speed of the rubbing roller with time, and a feeding speed of the rubbing roller is varied by at least 0.5% per substrate.
Claim 13
Dependent Claim
109 words
An aligning treatment method for a liquid crystal device including a pair of substrates each provided with stripe electrodes and a liquid crystal disposed between the substrates; the method comprising rubbing the pair of substrates with a rubbing roller such that one substrate having stripe electrodes extending in a direction perpendicular to the rubbing direction is rubbed first, and then the other substrate having stripe electrodes extending in a direction parallel to the rubbing direction is rubbed, wherein the rubbing is repeated while varying a feeding speed of the rubber roller with time, and a feeding speed of the rubbing roller is varied by at least 1% per substrate.
Claim 14
Dependent Claim
109 words
An aligning treatment method for a liquid crystal device including a pair of substrates each provided with stripe electrodes and a liquid crystal disposed between the substrates; the method comprising rubbing the pair of substrates with a rubbing roller such that one substrate having stripe electrodes extending in a direction perpendicular to the rubbing direction is rubbed first, and then the other substrate having stripe electrodes extending in a direction parallel to the rubbing direction is rubbed, wherein the rubbing is repeated while varying a feeding speed of the rubber roller with time, and a feeding speed of the rubbing roller is varied by at least 1% per substrate.
Claim 15
Dependent Claim
18 words
A method according to claim 9 or 10, wherein the rubbing is repeated for other pairs of substrates.
Claim 16
Dependent Claim
17 words
A method according to claim 9 or 10, wherein said liquid crystal is a ferroelectric liquid crystal.
Claim 17
Dependent Claim
26 words
A method according to claim 12, wherein the substrates are rubbed to align the ferroelectric liquid crystal at a pretilt angle of at least 10 degrees.
Claim 18
Dependent Claim
28 words
A method according to claim 9 or 10, wherein a rotational speed and/or a pressing depth against the substrate of the rubbing roller is additionally varied with time.
Claim 19
Dependent Claim
20 words
A method according to claim 14, wherein the rubbing roller pressing depth is varied by at least 1% per substrate.
Claim 20
Dependent Claim
32 words
A method according to claim 9 or 10, wherein the feeding speed of the rubbing roller is varied corresponding to the number of substrates or the number of pairs of substrates treated.
Claim 21
Dependent Claim
19 words
A method according to claim 9 or 10, wherein the feeding speed of the rubbing roller is varied stepwise.
Claim 22
Dependent Claim
15 words
A method according to claim 9 or 10, wherein the rubbing condition is varied linearly.
Claim 23
Dependent Claim
39 words
An aligning treatment method for a liquid crystal device including a pair of substrates each provided with stripe electrodes and a liquid crystal disposed between the substrates; the method comprising rubbing the pair of substrates at different rubbing intensities.
Claim 24
Dependent Claim
39 words
An aligning treatment method for a liquid crystal device including a pair of substrates each provided with stripe electrodes and a liquid crystal disposed between the substrates; the method comprising rubbing the pair of substrates at different rubbing intensities.
Claim 25
Dependent Claim
37 words
A method according to claim 19, wherein the difference in rubbing intensity is given by varying one or more of a feeding speed, a rotational speed and a pressing depth against the substrate of a rubbing roller.
Claim 26
Dependent Claim
20 words
A method according to claim 20, wherein the rubbing roller feeding speed is varied by at least 0.5% per substrate.
Claim 27
Dependent Claim
20 words
A method according to claim 20, wherein the rubbing roller rotational speed is varied by at least 1% per substrate.
Claim 28
Dependent Claim
20 words
A method according to claim 20, wherein the rubbing roller pressing depth is varied by at least 1% per substrate.
Claim 29
Dependent Claim
13 words
A method according to claim 20, wherein the rubbing intensity is varied stepwise.
Claim 30
Dependent Claim
13 words
A method according to claim 20, wherein the rubbing intensity is varied linearly.
Claim 31
Dependent Claim
15 words
A method according to claim 19, wherein said liquid crystal is a ferroelectric liquid crystal.
Claim 32
Dependent Claim
26 words
A method according to claim 26, wherein the substrates are rubbed to align the ferroelectric liquid crystal at a pretilt angle of at least 10 degrees.
Claim 33
Dependent Claim
22 words
A method according to claim 19, wherein the rubbing intensity is varied further corresponding to the number of pairs of substrates treated.
Claim 34
Dependent Claim
37 words
A method according to claim 28, wherein the further variation in rubbing intensity is given by one or more of a feeding speed, a rotational speed and a pressing depth against the substrate of a rubbing roller.
Claim 35
Dependent Claim
20 words
A method according to claim 29, wherein the rubbing roller feeding speed is varied by at least 0.5% per substrate.
Claim 36
Dependent Claim
20 words
A method according to claim 29, wherein the rubbing roller rotational speed is varied by at least 1% per substrate.
Claim 37
Dependent Claim
20 words
A method according to claim 29, wherein the rubbing roller pressing depth is varied by at least 1% per substrate.
Claim 38
Dependent Claim
13 words
A method according to claim 29, wherein the rubbing intensity is varied stepwise.
Claim 39
Dependent Claim
13 words
A method according to claim 29, wherein the rubbing intensity is varied linearly.
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