US5283674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backlight apparatus having ventilating holes for liquid crystal display
Assignee: Sony Corp
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Filing: 1992-09-30
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Granted: 1994-02-01
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Expires: 2012-09-30
Abstract
Abstract A liquid crystal display apparatus which prevents illumination of light by non-uniform brightness from a fluorescent lamp employed for the backlight illumination which is caused by mercury enclosed in the fluorescent tube being deposited on the inner surface of the tube of the fluorescent lamp. The liquid crystal display apparatus comprises a liquid crystal display panel, a backlight apparatus including a fluorescent lamp disposed on the rear face side of the liquid crystal display panel for directing illuminating backlight upon the liquid crystal display panel, and a reflecting plate disposed remote from the liquid crystal display panel with respect to the fluorescent lamp. The reflecting plate has a plurality of ventilating holes formed at portions of a recessed portion thereof opposing to an outer periphery of the fluorescent lamp.
Inventors
- 👤 Shunsuke Hanaoka
- 👤 Arifumi Etoh
- 👤 Heihachi Ide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:24
CPC Classifications
F; F21; F21V; F21V29/00; F21V29/50; F21V29/70; F21V29/83; F21V19/00; F21V19/0075; F21V19/0095; F21V29/502; F21V29/505; F21V7/00; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133604; G02F1/133605; G02F1/133611; H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/32; H01J61/325; F21Y; F21Y2103/00; F21Y2103/30; F21Y2103/37; G02F1/133628
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
A liquid crystal display apparatus comprising: a liquid crystal display panel; a backlight apparatus including a fluorescent lamp disposed on the rear face side of said liquid crystal display panel for illuminating backlight therefrom upon said liquid crystal display panel; and a reflecting plate disposed remote from said liquid crystal display panel with respect to said fluorescent lamp and having a plurality of ventilating holes formed at portions thereof opposing to an outer periphery of said fluorescent lamp, said plurality of ventilating holes being of a width less than a diameter of said fluorescent lamp to restrict deposits inside said fluorescent lamp to an area less than a diameter of said fluorescent lamp.
Claim 2
Dependent Claim
113 words
A liquid crystal display apparatus comprising: a liquid crystal display panel; a backlight apparatus including a fluorescent lamp disposed on the rear face side of said liquid crystal display panel for illuminating backlight therefrom upon said liquid crystal display panel; and a reflecting plate disposed remote from said liquid crystal display panel with respect to said fluorescent lamp and having a plurality of ventilating holes formed at portions thereof opposing to an outer periphery of said fluorescent lamp, said plurality of ventilating holes being of a width less than a diameter of said fluorescent lamp to restrict deposits inside said fluorescent lamp to an area less than a diameter of said fluorescent lamp.
Claim 3
Dependent Claim
38 words
A liquid crystal display apparatus according to claim 1, wherein said width is considerably smaller than the diameter of said fluorescent lamp and said ventilation holes are of a length less than a length of said fluorescent lamp.
Claim 4
Dependent Claim
43 words
A liquid crystal display apparatus according to claim 1, wherein said reflecting plate has a recessed portion formed thereon in which said fluorescent lamp is accommodated, and said ventilating holes are formed at the bottom of said recessed portion of said reflecting plate.
Claim 5
Dependent Claim
32 words
A liquid crystal display apparatus according to claim 1, wherein said fluorescent lamp has a generally U-shaped profile, and said ventilating holes are formed successively along the U-shape of said fluorescent lamp.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |