US5214522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display with back light and conductive diffuser
Assignee: Sony Corp
•
Filing: 1991-07-11
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Granted: 1993-05-25
•
Expires: 2011-07-11
Abstract
Abstract A liquid crystal display with a back light is provided, in which a diffuser (diffusing plate) mounted on a front surface of a casing in which the back light is housed is rendered conductive to thereby reduce the leakage of electromagnetic waves.
Inventors
- 👤 Koichi Tagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:10
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133553; G02F1/133308; G02F1/133334
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A liquid crystal display with a back light for illuminating said liquid crystal display characterized by rendering electrically conductive a diffuser attached to a rear surface of said liquid crystal display which is mounted on a front surface opening of an electrically conductive casing for housing said back light, wherein said diffuser is rendered conductive by mixing a predetermined amount of conductive material into said diffuser in the manufacturing process of said diffuser, and further comprising an electrically conductive fitting means mounted on an inner surface of said electrically conductive casing and being in contact with said diffuser for making electrical continuity between said diffuser and said casing.
Claim 2
Dependent Claim
108 words
A liquid crystal display with a back light for illuminating said liquid crystal display characterized by rendering electrically conductive a diffuser attached to a rear surface of said liquid crystal display which is mounted on a front surface opening of an electrically conductive casing for housing said back light, wherein said diffuser is rendered conductive by mixing a predetermined amount of conductive material into said diffuser in the manufacturing process of said diffuser, and further comprising an electrically conductive fitting means mounted on an inner surface of said electrically conductive casing and being in contact with said diffuser for making electrical continuity between said diffuser and said casing.
Claim 3
Dependent Claim
23 words
A liquid crystal display with a back light according to claim 1, wherein said conductive material is very small particle powder of carbon.
Claim 4
Dependent Claim
107 words
A liquid crystal display with a back light for illuminating said liquid crystal display characterized by rendering electrically conductive a diffuser attached to a rear surface of said liquid crystal display which is mounted on a front surface opening of an electrically conductive casing housing said back light, wherein said diffuser is rendered conductive by vapor depositing a conductive metal thin film to a rear surface of said diffuser and further comprising an electrically conductive fitting means mounted on an inner surface of said casing and being in electrical contact with said conductive film on said diffuser for making electrical continuity between said diffuser and said casing.
Claim 5
Dependent Claim
107 words
A liquid crystal display with a back light for illuminating said liquid crystal display characterized by rendering electrically conductive a diffuser attached to a rear surface of said liquid crystal display which is mounted on a front surface opening of an electrically conductive casing housing said back light, wherein said diffuser is rendered conductive by vapor depositing a conductive metal thin film to a rear surface of said diffuser and further comprising an electrically conductive fitting means mounted on an inner surface of said casing and being in electrical contact with said conductive film on said diffuser for making electrical continuity between said diffuser and said casing.
Claim 6
Dependent Claim
21 words
A liquid crystal display with a back light according to claim 3, wherein said metal thin film is made of gold.
Claim 7
Dependent Claim
21 words
A liquid crystal display with a back light according to claim 3, wherein said metal thin film is made of titanium.
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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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |