US5426522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating a polymer dispersed liquid crystal panel with measuring thickness, adjusting then hardening
Assignee: Panasonic Holdings Corp
•
Filing: 1993-08-04
•
Granted: 1995-06-20
•
Expires: 2013-08-04
Abstract
Abstract An empty cell is produced by adhering an array substrate and a counterelectrode substrate with a sealant resin of a predetermined height. A mixture liquid comprising liquid crystal and a polymerizable photosetting resin is injected into the empty cell. Then, the cell is interposed between a flat rigid bench and a flat rigid plate, and the mixture liquid is heated to make it transparent. Then, the thickness of the mixture liquid is measured with an interferometer. If the measured thickness deviates from a predetermined range, the flat rigid plate is pressed until the measured thickness changes into the predetermined range. Then, the mixture liquid is irradiated to form a liquid crystal/resin composite layer. Then, the pressure is removed. Thus, a liquid crystal/resin composite layer of uniform thickness can be obtained.
Inventors
- 👤 Hiroshi Takahara
- 👤 Masao Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:59
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334; G02F1/1306; G02F1/1309
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
141 words
A method for manufacturing a liquid crystal panel, which method comprising the steps of: providing a first electrode substrate and a second electrode substrate; adhering the first and second electrode substrate via a support member of a predetermined height provided at the periphery of first and second electrode substrates; providing a mixture liquid comprising a liquid crystal and polymerizable a resin; filling the mixture liquid in a space inside the support member between the first and second electrode substrates; measuring the thickness of the mixture liquid interposed between the first and second electrode substrates; changing the thickness of the mixture liquid within a predetermined range if the measured thickness is outside the predetermined range; and hardening the mixture liquid to separate the mixture liquid into a liquid crystal portion and a resin portion while keeping the thickness within the predetermined range.
Claim 2
Independent Claim
141 words
A method for manufacturing a liquid crystal panel, which method comprising the steps of: providing a first electrode substrate and a second electrode substrate; adhering the first and second electrode substrate via a support member of a predetermined height provided at the periphery of first and second electrode substrates; providing a mixture liquid comprising a liquid crystal and polymerizable a resin; filling the mixture liquid in a space inside the support member between the first and second electrode substrates; measuring the thickness of the mixture liquid interposed between the first and second electrode substrates; changing the thickness of the mixture liquid within a predetermined range if the measured thickness is outside the predetermined range; and hardening the mixture liquid to separate the mixture liquid into a liquid crystal portion and a resin portion while keeping the thickness within the predetermined range.
Claim 3
Dependent Claim
14 words
The method according to claim 1, wherein said support member comprises a sealant resin.
Claim 4
Dependent Claim
32 words
The method according to claim 1, wherein in said step of measuring the thickness, said mixture liquid is changed into a transparent state and the thickness is measured in the transparent state.
Claim 5
Dependent Claim
26 words
The method according to claim 3, wherein said mixture liquid is changed into a transparent state by heating the mixture liquid to become an isotropic state.
Claim 6
Dependent Claim
36 words
The method according to claim 3, wherein in said step of measuring the thickness of said mixture liquid, the thickness is measured at a plurality of positions in a display area of said liquid crystal panel.
Claim 7
Dependent Claim
29 words
The method according to claim 3, wherein in said step of changing the thickness of the mixture liquid, a pressure is applied between said first and second electrode substrates.
Claim 8
Dependent Claim
22 words
The method according to claim 1, wherein said resin is a photosetting resin and said mixture liquid is hardened by light radiations.
Claim 9
Dependent Claim
39 words
The method according to claim 1, wherein said liquid crystal comprises a nematic liquid crystal, said resin is a photo-setting resin, and the normal refractive index of said liquid crystal is substantially equal to that of said photosetting resin.
Claim 10
Dependent Claim
43 words
The method according to claim 1, wherein said support member has a height substantially equal to the thickness of said mixture liquid and said support member is located outside a display area of said liquid crystal between said first and second electrode substrates.
Claim 11
Dependent Claim
23 words
The method according to claim 1, wherein a ratio of liquid crystal in said mixture liquid is between 20 and 90 weight percent.
Claim 12
Dependent Claim
23 words
The method according to claim 10, wherein a ratio of liquid crystal in said mixture liquid is between 50 and 85 weight percent.
Claim 13
Dependent Claim
19 words
The method according to claim 1, wherein the height of said support member is between 5 and 25 μm.
Claim 14
Dependent Claim
26 words
The method according to claim 1, wherein said resin is a thermosetting resin and said mixture liquid is changed into a liquid crystal/resin composite by heating.
Claim 15
Independent Claim
91 words
A method for manufacturing a liquid crystal panel, said method comprising the steps of: providing a first electrode substrate and a second electrode substrate; providing a mixture liquid comprising a liquid crystal and a polymerizable resin; filling the mixture liquid between the first and second electrode substrates; measuring the thickness of the mixture liquid in the isotropic state; changing the thickness to within an allowable range if the measured thickness deviates from the allowable range; and hardening the mixture resin to separate into a liquid crystal portion and a resin portion.
Claim 16
Independent Claim
91 words
A method for manufacturing a liquid crystal panel, said method comprising the steps of: providing a first electrode substrate and a second electrode substrate; providing a mixture liquid comprising a liquid crystal and a polymerizable resin; filling the mixture liquid between the first and second electrode substrates; measuring the thickness of the mixture liquid in the isotropic state; changing the thickness to within an allowable range if the measured thickness deviates from the allowable range; and hardening the mixture resin to separate into a liquid crystal portion and a resin portion.
Claim 17
Dependent Claim
31 words
The method according to claim 14, further comprising a step of changing the thickness within an allowable range if the thickness measured in the measuring step deviates from the allowable range.
Claim 18
Independent Claim
83 words
A method for manufacturing a liquid crystal panel, said method comprising the steps of: providing a first electrode substrate and a second electrode substrate; providing a mixture liquid comprising a liquid crystal and a polymerizable resin; filling the mixture liquid between the first and second electrode substrates; heating the mixture liquid to form an isotropic state; measuring the thickness of the mixture liquid in the isotropic state; and hardening the mixture resin to separate into a liquid crystal portion and a resin portion.
Claim 19
Independent Claim
83 words
A method for manufacturing a liquid crystal panel, said method comprising the steps of: providing a first electrode substrate and a second electrode substrate; providing a mixture liquid comprising a liquid crystal and a polymerizable resin; filling the mixture liquid between the first and second electrode substrates; heating the mixture liquid to form an isotropic state; measuring the thickness of the mixture liquid in the isotropic state; and hardening the mixture resin to separate into a liquid crystal portion and a resin portion.
References Cited (Backward Citations)
US4435047A
Cited
US4944576A
Cited
US5150232A
Cited
JPH0358021A
Cited
JPH0484121A
Cited
US5305126A
Cited
US5278685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-19 | 1998-12-19 | 1999-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-19 | 2002-12-19 | 2003-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-19 | 2006-12-19 | 2007-06-20 | $7700.00 | Window Closed / Lapsed |