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US4786268A
Expired / Lapsed
US
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Liquid-crystal display manufacturing method
Assignee: Nokia Deutschland GmbH
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Filing: 1986-09-11
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Granted: 1988-11-22
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Expires: 2006-09-11
Abstract
Abstract The introduction of liquid-crystal material into a liquid-crystal cell is simplified by cooling the liquid-crystal material until it has a paste-like viscosity suitable for printing. After a spacer has been positioned on a first substrate, the liquid-crystal material is introduced within the interior portion of the spacer using printing techniques. A second substrate is then placed on the spacer, and the display is sealed.
Inventors
- 👤 Rolf Zondler
- 👤 Jurgen Pottharst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:41
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1341
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A method of manufacturing a liquid-crystal display containing liquid-crystal material between two substrates comprising: (a) providing a suitably prepared first substrate; (b) printing a predetermined two-dimensional pattern of unencapsulated liquid-crystal material having a predetermined temperature onto said first substrate, said predetermined temperature being selected to provide an optimal viscosity for printing; (c) covering said liquid-crystal material with a suitably prepared second substrate; and (d) sealing the region between said first and second substrates containing said two-dimensional pattern of liquid-crystal material.
Claim 2
Independent Claim
80 words
A method of manufacturing a liquid-crystal display containing liquid-crystal material between two substrates comprising: (a) providing a suitably prepared first substrate; (b) printing a predetermined two-dimensional pattern of unencapsulated liquid-crystal material having a predetermined temperature onto said first substrate, said predetermined temperature being selected to provide an optimal viscosity for printing; (c) covering said liquid-crystal material with a suitably prepared second substrate; and (d) sealing the region between said first and second substrates containing said two-dimensional pattern of liquid-crystal material.
Claim 3
Dependent Claim
46 words
The method as claimed in claim 1, comprising the additional step of temporarily cooling said liquid-crystal material to said predetermined temperature during said printing step, whereby the viscosity of said liquid-crystal material during normal operation of said display is independent of said optimal viscosity for printing.
Claim 4
Dependent Claim
24 words
The method as claimed in claim 2, wherein said printing step is performed by means of a silk screen process in a cooled room.
Claim 5
Dependent Claim
25 words
The method as claimed in claim 2 wherein said printing step is performed by means of a cylinder printing process using a cooled printing cylinder.
Claim 6
Dependent Claim
24 words
The method as claimed in claim 2 wherein said printing step is performed by means of a tampon process using a cooled printing plate.
Claim 7
Dependent Claim
39 words
The method of claim 1, comprising the additional step of providing a spacer on said first substrate prior to said printing step, and wherein said printing step deposits said liquid crystal material within the interior portion of said spacer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |