Patent US5479284A successfully refreshed from Google Patents.
US5479284A
Expired / Lapsed
US
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Increasing temperature injection methods for a liquid crystal cell
Assignee: Canon Inc
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Filing: 1993-08-17
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Granted: 1995-12-26
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Expires: 2013-08-17
Abstract
Abstract A large-sized liquid crystal panel uniformly filled with a liquid crystal material may be produced through a process including the steps of: fixing a pair of substrates with a sealing member disposed therebetween to form a blank panel having an injection port, reducing a pressure within the panel, applying a liquid crystal material onto the injection port, heating the liquid crystal material to its isotropic temperature, injecting the liquid crystal material into the panel under a pressure, and filling the panel with the liquid crystal material under heating and pressurization from the injection port toward the panel inside. The pressure within the panel before the injection is reduced at a rate not exceeding 25 torr/min. The pressure for injection is increased at varying rates, e.g., with an intermediate constant pressure period. In the filling step, a portion of the liquid crystal material near the injection port is held in its isotropic phase and the liquid crystal material except for the portion is transformed at least once into a smectic phase.
Inventors
- 👤 Yasuyuki Watanabe
- 👤 Kazuya Ishiwata
- 👤 Masaaki Suzuki
- 👤 Noriyuki Nakai
- 👤 Takashi Enomoto
- 👤 Naoya Nishida
- 👤 Tatsuo Murata
- 👤 Mutsuo Mitsui
- 👤 Masayuki Shimamune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:45
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/13392; G02F1/1341; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
The process for producing a liquid crystal panel, comprising the steps of: fixing a pair of substrates with a sealing member disposed therebetween to form a blank panel having a prescribed gap between the substrates and an injection port, reducing pressure within the cell, applying a liquid crystal material onto the injection port, heating the liquid crystal material to its isotropic temperature, and injecting the liquid crystal material into the panel under a pressure which increases at varying rates up to a maximum pressure, said liquid crystal being injected at a temperature which increases during injection.
Claim 2
Dependent Claim
96 words
The process for producing a liquid crystal panel, comprising the steps of: fixing a pair of substrates with a sealing member disposed therebetween to form a blank panel having a prescribed gap between the substrates and an injection port, reducing pressure within the cell, applying a liquid crystal material onto the injection port, heating the liquid crystal material to its isotropic temperature, and injecting the liquid crystal material into the panel under a pressure which increases at varying rates up to a maximum pressure, said liquid crystal being injected at a temperature which increases during injection.
Claim 3
Dependent Claim
25 words
A process according to claim 1, wherein the pressure for injection is held at a constant value for a prescribed period at least one time.
Claim 4
Dependent Claim
13 words
A process according to claim 2, wherein the prescribed period is 1-5 hours.
Claim 5
Dependent Claim
30 words
A process according to any of claims 1-3, wherein the pressure for injection is increased at a rate of at least 135 torr/hour except for a period of constant pressure.
Claim 6
Dependent Claim
117 words
A process for producing a liquid crystal panel, comprising the steps of: fixing a pair of substrates with a sealing member disposed therebetween to form a blank panel having a prescribed gap between the substrates and an injection port, and injecting a liquid crystal material through the injection port into the panel, the liquid crystal material being injected at a temperature which increases during injection, said liquid crystal material progressing within the panel at a speed v(t) at a time t from the start of the injection satisfying 0.5v a ≦v(t)≦1.5v a , wherein v a denotes an average speed within a range of 0.005-0.5 cm/min. determined by: ##EQU3## wherein T denotes a total period of injection.
Claim 7
Dependent Claim
117 words
A process for producing a liquid crystal panel, comprising the steps of: fixing a pair of substrates with a sealing member disposed therebetween to form a blank panel having a prescribed gap between the substrates and an injection port, and injecting a liquid crystal material through the injection port into the panel, the liquid crystal material being injected at a temperature which increases during injection, said liquid crystal material progressing within the panel at a speed v(t) at a time t from the start of the injection satisfying 0.5v a ≦v(t)≦1.5v a , wherein v a denotes an average speed within a range of 0.005-0.5 cm/min. determined by: ##EQU3## wherein T denotes a total period of injection.
Claim 8
Dependent Claim
21 words
A process according to any of claims 1-3 and 5, wherein the liquid crystal material comprises a ferroelectric liquid crystal material.
Claim 9
Dependent Claim
16 words
A process according to claims 1 or 5, wherein the liquid crystal shows a smectic phase.
References Cited (Backward Citations)
US4691995A
Cited
US5078475A
Cited
US4802743A
Cited
JPS62237422A
Cited
JPS6315218A
Cited
JPS63223729A
Cited
JPS6431118A
Cited
US5024255A
Cited
EP0312028A2
Cited
EP0343902A2
Cited
USRE34690E
Cited
EP0347913A1
Cited
US5150239A
Cited
US5269351A
Cited
EP0458321A2
Cited
US5177627A
Cited
JPH04316021A
Cited
US5285300A
Cited
US5355236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-25 | 1999-06-26 | 1999-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-25 | 2003-06-26 | 2003-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-25 | 2007-06-26 | 2007-12-26 | $7700.00 | Window Closed / Lapsed |