US5103331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal cell having substantially uniform distribution of spacers and non-uniform distribution of particulate adhesive
Assignee: Canon Inc
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Filing: 1989-07-31
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Granted: 1992-04-07
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Expires: 2009-07-31
Abstract
Abstract A liquid crystal cell is formed by a pair of substrates each provided with an electrode and disposed spaced apart from each other, spacers and particulate adhesives respectively dispersed between the substrates and a liquid crystal, particularly a ferroelectric liquid crystal, sandwiched between the substrates. The particulate adhesives are dispersed with a non-uniform distribution over the cell extension so as to minimize initial zigzag or serrate alignment defects.
Inventors
- 👤 Osamu Taniguchi
- 👤 Yukio Hanyu
- 👤 Toshiharu Uchimi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:58
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/13392
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
80 words
A liquid crystal cell, comprising: a pair of substrates each of said substrates being provided with an electrode, said pair of substrates being disposed spaced apart from each other; said liquid crystal cell further comprising spacers and particulate adhesives dispersed between the substrates and a liquid crystal sandwiched between the substrates, wherein said particulate adhesives are dispersed with a non-uniform distribution over the cell extension and said spacers are dispersed to have a substantially uniform distribution over the cell extension.
Claim 2
Dependent Claim
80 words
A liquid crystal cell, comprising: a pair of substrates each of said substrates being provided with an electrode, said pair of substrates being disposed spaced apart from each other; said liquid crystal cell further comprising spacers and particulate adhesives dispersed between the substrates and a liquid crystal sandwiched between the substrates, wherein said particulate adhesives are dispersed with a non-uniform distribution over the cell extension and said spacers are dispersed to have a substantially uniform distribution over the cell extension.
Claim 3
Dependent Claim
53 words
A cell according to claim 1, wherein said particulate adhesives are dispersed to have a distribution factor of 2 or larger, said distribution factor being defined as a ratio between a maximum density and a minimum density of the particulate adhesives for regions of 1 mm square arbitrarily taken over the cell extension.
Claim 4
Dependent Claim
21 words
A cell according to claim 2, wherein said particulate adhesives are dispersed to have a distribution factor of 4 or larger.
Claim 5
Dependent Claim
14 words
A cell according to claim 1, wherein said particulate adhesives comprise an epoxy adhesive.
Claim 6
Dependent Claim
21 words
A cell according to claim 1, wherein said particulate adhesives are dispersed to have a distribution in the form of stripes.
Claim 7
Dependent Claim
24 words
A cell according to claim 1, wherein said spacers are dispersed to have a substantially uniform distribution of 50-1000/mm 2 over the cell extension.
Claim 8
Dependent Claim
12 words
A cell according to claim 1, wherein said spacers comprise silica beads.
Claim 9
Dependent Claim
15 words
A cell according to claim 1, wherein said liquid crystal comprises a ferroelectric liquid crystal.
Claim 10
Dependent Claim
26 words
A cell according to claim 8, wherein said ferroelectric liquid crystal is in a ferroelectric liquid crystal phase formed by cooling from a higher temperature phase.
Claim 11
Dependent Claim
138 words
A liquid crystal cell prepared according to a process comprising the steps of: (i) providing a pair of substrates each with an electrode and dispersing spacers at a substantially uniform distribution on at least one of the substrates over the extension thereof; (ii) dispersing particulate adhesives on at least one of the substrate with a non-unform distribution over the extension of the substrate; (iii) disposing the substrates opposite to each other with the spacers and particulate adhesives sandwiched therebetween and sealing the substrates to each other with a space therebetween defined by the spacers to form a blank cell; (iv) filling the blank cell with a ferroelectric liquid crystal in a higher temperature phase than its ferroelectric liquid crystal phase; and (v) cooling the ferroelectric liquid crystal from the higher temperature phase to the ferroelectric liquid crystal phase.
Claim 12
Dependent Claim
138 words
A liquid crystal cell prepared according to a process comprising the steps of: (i) providing a pair of substrates each with an electrode and dispersing spacers at a substantially uniform distribution on at least one of the substrates over the extension thereof; (ii) dispersing particulate adhesives on at least one of the substrate with a non-unform distribution over the extension of the substrate; (iii) disposing the substrates opposite to each other with the spacers and particulate adhesives sandwiched therebetween and sealing the substrates to each other with a space therebetween defined by the spacers to form a blank cell; (iv) filling the blank cell with a ferroelectric liquid crystal in a higher temperature phase than its ferroelectric liquid crystal phase; and (v) cooling the ferroelectric liquid crystal from the higher temperature phase to the ferroelectric liquid crystal phase.
Claim 13
Dependent Claim
28 words
A cell according to claim 10, wherein the step (V) comprises cooling the ferroelectric liquid crystal from cholesteric phase through smectic A phase into ferroelectric chiral smectic phase.
Claim 14
Dependent Claim
31 words
A cell according to claim 10, wherein the step (V) comprises cooling the ferroelectric liquid crystal from isotropic phase through cholesteric phase and smectic A phase into ferroelectric chiral smectic phase.
Claim 15
Dependent Claim
24 words
A cell according to claim 10, wherein the step (iv) comprises filling the blank cell with the ferroelectric liquid crystal in its cholesteric phase.
Claim 16
Dependent Claim
52 words
A cell according to claim 10, wherein said particulate adhesives are dispersed to have a distribution factor of 2 or larger, said distribution factor being defined as a ratio between a maximum density and a minimum density of the particulate adhesives for regions of 1 mm square arbitrarily taken over the substrate.
Claim 17
Dependent Claim
21 words
A cell according to claim 14, wherein said particulate adhesives are dispersed to have a distribution factor of 4 or larger.
Claim 18
Dependent Claim
14 words
A cell according to claim 10, wherein said particulate adhesives comprise an epoxy adhesive.
Claim 19
Dependent Claim
21 words
A cell according to claim 10, wherein said particulate adhesives are dispersed to have a distribution in the form of stripes.
Claim 20
Dependent Claim
23 words
A cell according to claim 10, wherein said spacers are dispersed to have a substantially uniform distribution of 50-1000/mm 2 over the substrate.
Claim 21
Dependent Claim
12 words
A cell according to claim 10, wherein said spacers comprise silica beads.
References Cited (Backward Citations)
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