US5402324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface illuminant device
Assignee: Enplas Corp
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Filing: 1994-06-02
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Granted: 1995-03-28
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Expires: 2014-06-02
Abstract
Abstract A surface illuminate device illuminates a liquid crystal display panel by diffused light produced through a diffusing plate disposed on the front of an illuminant section. A prism sheet having many triangular prisms is disposed on the exit side of the diffusing plate so that the longitudinal direction of each prism is nearly parallel to the plane of polarization of a polarizing plate placed on the prism sheet side of the liquid crystal display panel. Thus, the surface illuminant device can provide bright illumination suitable for the backlight of the liquid crystal display panel.
Inventors
- 👤 Kazuaki Yokoyama
- 👤 Tsuyoshi Ishikawa
- 👤 Kayoko Watai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:55
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/005; G02B6/0053; F; F21; F21V; F21V9/00; F21V9/14; G02B6/0051; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133504; G02F1/133507; G02F1/1336; G02F1/133602; G02F1/133606; G02F1/133607
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A surface illuminant device for illuminating a liquid crystal display panel by diffused ,light produced through a diffusing plate disposed on a front of an illuminant section, wherein a prism sheet having a plurality of elongated prisms of triangular cross section is disposed on an exit side of said diffusing plate, said prism sheet being situated so that a longitudinal direction of each of the prisms is substantially parallel to a plane of polarization of a polarizing plate placed on a side of said prism sheet closet to the liquid crystal display panel.
Claim 2
Dependent Claim
93 words
A surface illuminant device for illuminating a liquid crystal display panel by diffused ,light produced through a diffusing plate disposed on a front of an illuminant section, wherein a prism sheet having a plurality of elongated prisms of triangular cross section is disposed on an exit side of said diffusing plate, said prism sheet being situated so that a longitudinal direction of each of the prisms is substantially parallel to a plane of polarization of a polarizing plate placed on a side of said prism sheet closet to the liquid crystal display panel.
References Cited (Backward Citations)
US4017155A
Cited
US4011001A
Cited
US4020336A
Cited
EP0212415A1
Cited
US4789224A
Cited
US5126882A
Cited
US5064276A
Cited
US5341231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |