US6099786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making accurate dimension alignment film for LCD
Assignee: E Ink Holdings Inc
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Filing: 1996-02-23
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Granted: 2000-08-08
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Expires: 2016-02-23
Abstract
Abstract A method of making accurate alignment layers in a liquid crystal display (LCD) cell is provided so that the LCD seal band can be placed as close to the pixel as possible. This method is implemented by ablating the apolyimide film on the glass substrates of the LCD cell to remove the alignment film where the sealing material is to be dispersed later. Thus, the sealing band can butt against the liquid crystal mixture without any clearance. In so doing, the display area is increased, and the reliability of the seal is improved.
Inventors
- 👤 Dyi-chung Hu
- 👤 Sheng-Heisn Lin
- 👤 Tai-Kang Wu
- 👤 Sywe N. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:14
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; C; C09; C09K; C09K2323/00; C09K2323/02; G02F1/1337; G02F1/133711
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
197 words
A method of making alignment layers with accurate dimensions in a liquid crystal display (LCD) cell having two transparent substrates, one containing thin film transistors (TFT) and another containing color filters (CF), liquid crystal mixture between said substrates, spacers for maintaining the gap between said substrates, an alignment layer inside each one of said substrates, and a seal band for sealing the periphery of said substrates, comprising the steps of: depositing a transparent electrically conductive electrode on each one of said substrates, coating a layer of alignment film on the surface of each one of said substrates, curing said alignment film, rubbing said alignment film in a desired desirable direction, then ablating the alignment film selectively to remove the alignment film where said sealing band is to be located, dispersing said spacers onto the surface of a first one of the two transparent substrates, screen printing a sealant onto the ablated surface of a second one of the two transparent substrates to form said sealing band, aligning the said substrates, filling the space between said substrates with said liquid crystal mixture by injecting through an injection hole, and sealing said liquid crystal cell by curing said sealant.
Claim 2
Independent Claim
197 words
A method of making alignment layers with accurate dimensions in a liquid crystal display (LCD) cell having two transparent substrates, one containing thin film transistors (TFT) and another containing color filters (CF), liquid crystal mixture between said substrates, spacers for maintaining the gap between said substrates, an alignment layer inside each one of said substrates, and a seal band for sealing the periphery of said substrates, comprising the steps of: depositing a transparent electrically conductive electrode on each one of said substrates, coating a layer of alignment film on the surface of each one of said substrates, curing said alignment film, rubbing said alignment film in a desired desirable direction, then ablating the alignment film selectively to remove the alignment film where said sealing band is to be located, dispersing said spacers onto the surface of a first one of the two transparent substrates, screen printing a sealant onto the ablated surface of a second one of the two transparent substrates to form said sealing band, aligning the said substrates, filling the space between said substrates with said liquid crystal mixture by injecting through an injection hole, and sealing said liquid crystal cell by curing said sealant.
Claim 3
Dependent Claim
30 words
A method as described in claim 1, wherein said liquid mixture is selected from a group of liquid crystals consisting of twisted nematic (TN), super twisted nematic (STN) and ferroelectrics.
Claim 4
Dependent Claim
42 words
A method as described in claim 1, wherein said alignment film is selected from a group of organic films consisting of polyimide, polyvinyl alcohol, polyvinyl acetal, polyvinylchloride, polystyrene, polyamide, polyamideimide, polyester, polyesterimide, polycarbonate, cellulose resin, melamine resin, urea resin, and acrylic resin.
Claim 5
Dependent Claim
25 words
A method as described in claim 1, wherein said alignment film is modified by ultra-violet curing to modify the orientation of the liquid crystal mixture.
Claim 6
Dependent Claim
19 words
A method as described in claim 1, wherein said coating step is selected between roller coating and spin coating.
Claim 7
Dependent Claim
27 words
A method as described in claim 1, wherein said step of curing alignment film is selected between heating in an oven and heating on a hot plate.
Claim 8
Dependent Claim
20 words
A method as described in claim 1, wherein said step of ablating said excess alignment film is implemented by laser.
Claim 9
Dependent Claim
24 words
A method as described in claim 7, wherein said laser is a Excimer laser with a wavelength selected from 318, 245 and 198 nm.
Claim 10
Dependent Claim
21 words
A method as described in claim 7, wherein said laser is a Nd-YAG laser operating in a triple frequency UV range.
Claim 11
Dependent Claim
15 words
A method as described in claim 7, wherein the beam of said laser is scanned.
Claim 12
Dependent Claim
16 words
A method as described in claim 7, wherein said ablation is implemented by moving said substrate.
Claim 13
Dependent Claim
12 words
A method as described in claim 1, wherein said sealant is dispensed.
Claim 14
Dependent Claim
13 words
A method as described in claim 1, wherein said sealant is screen printed.
Claim 15
Dependent Claim
19 words
A method as described in claim 1, wherein said step of ablating and said step of rubbing are reversed.
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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) | 2003-08-08 | 2004-02-07 | 2004-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-08-08 | 2008-02-07 | 2008-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-08-08 | 2012-02-07 | 2012-08-08 | $7700.00 | Window Closed / Lapsed |