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US5648829A
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Method for fabricating a liquid crystal display including irradiating an alignment film with UV light
Assignee: Kyocera Corp
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Filing: 1995-02-03
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Granted: 1997-07-15
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Expires: 2015-02-03
Abstract
Abstract A liquid crystal display device and a method for fabricating the same are provided. In fabricating a liquid crystal display device, the method enables liquid crystal alignment operation to be easily and accurately carried out in such a way that liquid crystal alignment is changed between adjacent minute regions. An alignment film is formed on a glass substrate formed with transparent electrodes, and then rubbing operation is performed using a rubbing cloth in one direction with respect to the alignment film, so that the alignment film is caused to maintain a high pretilt condition. After a mask substrate is so positioned as to register with the glass substrate, ultraviolet light irradiation is effected to form a high-pretilt keeping region and a low-pretilt keeping region on the surface of the alignment film. In the display device, it is arranged that one high-pretilt keeping region is disposed opposite one low-pretilt keeping region. Use of ultraviolet light in forming the high-pretilt keeping and low-pretilt keeping regions provides for good simplicity in the fabricating process involved.
Inventors
- 👤 Wataru Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:57
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/13378; G02F1/133788; G02F1/133753; G02F1/133761
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
250 words
A method for fabricating a liquid crystal display device, comprising: forming on a first glass substrate a first transparent electrode and a first alignment film comprising an organic material, subjecting the first alignment film to rubbing, locally irradiating the first alignment film with ultraviolet light after subjecting the first alignment film to rubbing to thereby form a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, forming on a second glass substrate a second transparent electrode and a second alignment film comprising an organic material, subjecting the second alignment film to rubbing, locally irradiating the second alignment film with ultraviolet light after subjecting the second alignment film to rubbing to thereby form a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, bonding the first substrate to a second glass substrate having a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, the first and second substrates being arranged so that the region for keeping liquid crystal at a high pretilt angle of the first substrate is substantially opposite the region for keeping liquid crystal at a low pretilt angle of the second substrate, and introducing liquid crystal between the first and second substrates, wherein the ultraviolet light defines an integral quantity of light not lower than 1000 mJ/cm 2 .
Claim 2
Independent Claim
250 words
A method for fabricating a liquid crystal display device, comprising: forming on a first glass substrate a first transparent electrode and a first alignment film comprising an organic material, subjecting the first alignment film to rubbing, locally irradiating the first alignment film with ultraviolet light after subjecting the first alignment film to rubbing to thereby form a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, forming on a second glass substrate a second transparent electrode and a second alignment film comprising an organic material, subjecting the second alignment film to rubbing, locally irradiating the second alignment film with ultraviolet light after subjecting the second alignment film to rubbing to thereby form a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, bonding the first substrate to a second glass substrate having a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, the first and second substrates being arranged so that the region for keeping liquid crystal at a high pretilt angle of the first substrate is substantially opposite the region for keeping liquid crystal at a low pretilt angle of the second substrate, and introducing liquid crystal between the first and second substrates, wherein the ultraviolet light defines an integral quantity of light not lower than 1000 mJ/cm 2 .
Claim 3
Independent Claim
252 words
A method for fabricating a liquid crystal display device, comprising: forming on a first glass substrate a first transparent electrode and a first alignment film comprising an organic material, locally irradiating the first alignment film with ultraviolet light, subjecting the first alignment film to rubbing after locally irradiating the first alignment film with ultraviolet light to thereby form a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, forming on a second glass substrate a second transparent electrode and a second alignment film comprising an organic material, subjecting the second alignment film to rubbing, locally irradiating the second alignment film with ultraviolet light after subjecting the second alignment film to rubbing to thereby form a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, bonding the first substrate to a second glass substrate having a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, the first and second substrates being arranged so that the region for keeping liquid crystal at a high pretilt angle of the first substrate is substantially opposite the region for keeping liquid crystal at a low pretilt angle of the second substrate, and introducing liquid crystal between the first and second substrates, wherein the ultraviolet light defines an integral quantity of light not lower than 1000 mJ/cm 2 .
Claim 4
Independent Claim
252 words
A method for fabricating a liquid crystal display device, comprising: forming on a first glass substrate a first transparent electrode and a first alignment film comprising an organic material, locally irradiating the first alignment film with ultraviolet light, subjecting the first alignment film to rubbing after locally irradiating the first alignment film with ultraviolet light to thereby form a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, forming on a second glass substrate a second transparent electrode and a second alignment film comprising an organic material, subjecting the second alignment film to rubbing, locally irradiating the second alignment film with ultraviolet light after subjecting the second alignment film to rubbing to thereby form a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, bonding the first substrate to a second glass substrate having a region for keeping liquid crystal at a high pretilt angle and a region for keeping liquid crystal at a low pretilt angle, the first and second substrates being arranged so that the region for keeping liquid crystal at a high pretilt angle of the first substrate is substantially opposite the region for keeping liquid crystal at a low pretilt angle of the second substrate, and introducing liquid crystal between the first and second substrates, wherein the ultraviolet light defines an integral quantity of light not lower than 1000 mJ/cm 2 .
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2000-07-14 | 2001-01-13 | 2001-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-14 | 2005-01-13 | 2005-07-15 | $3760.00 | Window Closed / Lapsed |
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