US5939735A
Expired / Lapsed
US
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Semiconductor light emitting device
Assignee: Rohm Co Ltd
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Filing: 1997-12-18
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Granted: 1999-08-17
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Expires: 2017-12-18
Abstract
Abstract A semiconductor light emitting device includes a substrate and semiconductor overlying layers formed on the substrate. A light emitting layer is formed in the semiconductor layer so as to emit light. The substrate is transmittable of the light emitted by the light emitting layer. A light reflecting layer is formed on a part of a back surface of the substrate. As a result, a semiconductor light emitting device is obtainable by easily dividing a wafer having thereon a light emitting film through recognizing, from a wafer back side, semiconductor layer chip pattern formed overlying the main surface of the wafer.
Inventors
- 👤 Tsuyoshi Tsutsui
- 👤 Shunji Nakata
- 👤 Yukio Shakuda
- 👤 Masayuki Sonobe
- 👤 Norikazu Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:46
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/84; H10H20/841; H10H20/01; H10H20/011; H10H20/013; H10H20/0133; H10H20/01335; H10H20/872
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
A semiconductor light emitting device comprising: a substrate made of sapphire; semiconductor overlying layers made of gallium-nitride based compound semiconductor formed on said substrate; a light emitting layer formed in said semiconductor overlying layers so as to emit light; wherein said substrate is transmittable of the light emitted by said light emitting layer; and a light reflecting film pattern formed on a whole back surface of said substrate so that a peripheral part of a chip is at least partially exposed.
Claim 2
Dependent Claim
81 words
A semiconductor light emitting device comprising: a substrate made of sapphire; semiconductor overlying layers made of gallium-nitride based compound semiconductor formed on said substrate; a light emitting layer formed in said semiconductor overlying layers so as to emit light; wherein said substrate is transmittable of the light emitted by said light emitting layer; and a light reflecting film pattern formed on a whole back surface of said substrate so that a peripheral part of a chip is at least partially exposed.
Claim 3
Dependent Claim
25 words
A semiconductor light emitting device according to claim 1, wherein said light reflecting film pattern is provided in a circular or rectangular regular pattern form.
Claim 4
Dependent Claim
24 words
A semiconductor light emitting device according to claim 1, wherein said light reflecting film pattern is provided in an irregularly and dotted pattern form.
Claim 5
Dependent Claim
41 words
A semiconductor light emitting device according to claim 1, wherein said light reflecting film pattern is provided in a reticulate pattern form so that portions free of said light reflecting film pattern are dotted on the back surface of said substrate.
Claim 6
Dependent Claim
24 words
A semiconductor light emitting device according to claim 1, wherein said light reflecting film pattern is formed of a metal having high light reflectivity.
Claim 7
Dependent Claim
29 words
A semiconductor light emitting device according to claim 1, wherein said light reflecting film pattern is formed of a metal oxide or ceramics that has a high light reflectivity.
Claim 8
Dependent Claim
41 words
A semiconductor light emitting device according to claim 1, wherein said light reflecting film pattern covering the back surface of said substrate is in a total area of 50 to 90% with respect to the back surface area of said substrate.
Claim 9
Dependent Claim
33 words
A semiconductor light emitting device according to claim 1, wherein said light reflecting film pattern being formed such that slicing lines can be recognized when viewed from said back surface of said substrate.
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) | 2002-08-16 | 2003-02-15 | 2003-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-16 | 2007-02-15 | 2007-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-16 | 2011-02-15 | 2011-08-17 | $7700.00 | Window Closed / Lapsed |