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US5982092A
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Light Emitting Diode planar light source with blue light or ultraviolet ray-emitting luminescent crystal with optional UV filter
Assignee: Solidlite Corp
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Filing: 1997-10-06
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Granted: 1999-11-09
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Expires: 2017-10-06
Abstract
Abstract LED planar light source which introduces blue light or ultra violet rays emitted from luminescent crystals to a light conductive plate from its side surface. After being scattered and diffused by the light conductive plate and reflected from a reflection layer, the incident light and the excited light from a fluorescent pigment layer are mixed and synthesized to form white light or light of another specific wave length. Such a planar light source can be utilized as a back light source for a LCD.
Inventors
- 👤 Hsing Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:02
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/005; G02B6/0055; G02B6/0035; G02B6/0038; G02B6/0051
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A Light Emitting Diode planar light source comprising: a) a non-electrode, light conductive plate having first and second opposite facing surfaces and a plurality of side edges, the first surface having a plurality of corrugations therein to scatter light entering from at least one of the plurality of side edges; b) a diffusing plate located on the second surface of the light conductive plate for uniformly diffusing light emanating from the second surface of the light conductive plate; c) a non-electrode reflector enclosing the plurality of side edges and the first surface of the light conductive plate; d) a layer of fluorescent material located between the first surface of the light conductive plate and the reflector; and, e) at least one luminescent crystal located so as to emit light through at least one of the side edges of the light conductive plate, whereby the light is scattered uniformly by the corrugations and light reflected by the reflector excites the layer of fluorescent material.
Claim 2
Dependent Claim
163 words
A Light Emitting Diode planar light source comprising: a) a non-electrode, light conductive plate having first and second opposite facing surfaces and a plurality of side edges, the first surface having a plurality of corrugations therein to scatter light entering from at least one of the plurality of side edges; b) a diffusing plate located on the second surface of the light conductive plate for uniformly diffusing light emanating from the second surface of the light conductive plate; c) a non-electrode reflector enclosing the plurality of side edges and the first surface of the light conductive plate; d) a layer of fluorescent material located between the first surface of the light conductive plate and the reflector; and, e) at least one luminescent crystal located so as to emit light through at least one of the side edges of the light conductive plate, whereby the light is scattered uniformly by the corrugations and light reflected by the reflector excites the layer of fluorescent material.
Claim 3
Dependent Claim
25 words
The Light Emitting Diode planar light source of claim 1 wherein the at least one luminescent crystal comprises at least one blue light emitting diode.
Claim 4
Dependent Claim
18 words
The Light Emitting Diode planar light source of claim 2 wherein the fluorescent material contains yellow fluorescent powder.
Claim 5
Dependent Claim
29 words
The Light Emitting Diode planar light source of claim 1 further comprising a filter layer located between the second surface of the light conductive plate and the diffusing plate.
Claim 6
Dependent Claim
38 words
The Light Emitting Diode planar light source of claim 4 wherein the at least one luminescent crystal emits ultra violet rays and the filter layer filters ultra violet rays out of the light passing through the filter layer.
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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) | 2002-11-08 | 2003-05-10 | 2003-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-08 | 2007-05-10 | 2007-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-08 | 2011-05-10 | 2011-11-09 | $7700.00 | Window Closed / Lapsed |