US5324962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-color semiconductor light emitting device
Assignee: Toshiba Corp
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Filing: 1992-06-12
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Granted: 1994-06-28
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Expires: 2012-06-12
Abstract
Abstract A semiconductor light emitting device of this invention has more than three light emitting diodes which includes a pair of diodes connected parallel in the reverse direction for each other. A common terminal connecting each one of the electrodes of said all diodes, the first terminal in which the other electrodes of said diode pair is connected, and the second terminal in which the other electrode of the rest diode is connected, are provide in order to drive said diodes separately.
Inventors
- 👤 Satoshi Komoto
- 👤 Hiroshi Nagasawa
- 👤 Hitoshi Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:31
CPC Classifications
H; H10; H10W; H10W90/00; H05; H05B; H05B45/00; H05B45/20; H05B45/30; H05B45/37; H05B45/3725; H05B45/40; H05B45/42; H05B47/00; H05B47/10; H05B47/155; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W74/00; H10W90/701; H10W90/751; H10W90/756; Y; Y10; Y10S; Y10S257/00; Y10S257/918
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
A semiconductor light emitting device having a plurality of light emitting diodes which emit different colored light when an electric current is passed therethrough in a forward direction, comprising: first, second and third light emitting diodes, each of said first, second and third light emitting diodes having first and second electrodes, said first and second light emitting diodes being connected in parallel in the reverse direction; a common terminal for providing a common electrical connection to each of said first electrodes of said first, second and third light emitting diodes; a first terminal for providing a common electrical connection to the second electrodes of said first and second light emitting diodes; and a second terminal for providing electrical connection to the second electrode of said third light emitting diode.
Claim 2
Dependent Claim
129 words
A semiconductor light emitting device having a plurality of light emitting diodes which emit different colored light when an electric current is passed therethrough in a forward direction, comprising: first, second and third light emitting diodes, each of said first, second and third light emitting diodes having first and second electrodes, said first and second light emitting diodes being connected in parallel in the reverse direction; a common terminal for providing a common electrical connection to each of said first electrodes of said first, second and third light emitting diodes; a first terminal for providing a common electrical connection to the second electrodes of said first and second light emitting diodes; and a second terminal for providing electrical connection to the second electrode of said third light emitting diode.
Claim 3
Dependent Claim
33 words
The semiconductor light emitting device as claimed in claim 1, wherein a GaP green emitting diode, SiC blue emitting diode, and a GaAlAs red emitting diode are included in said light emitting diodes.
Claim 4
Dependent Claim
32 words
The semiconductor light emitting device as claimed in claim 1, wherein said common terminal is comprised of a lead in which all said light emitting diodes are equipped on its top surface.
References Cited (Backward Citations)
JPS5555586A
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US4630183A
Cited
JPS6189683A
Cited
JPS6431473A
Cited
JPH02238680A
Cited
JPH02238679A
Cited
US5008788A
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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) | 1997-06-27 | 1997-12-27 | 1998-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-27 | 2001-12-27 | 2002-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-27 | 2005-12-27 | 2006-06-28 | $7700.00 | Window Closed / Lapsed |