Patent US4298869A successfully refreshed from Google Patents.
US4298869A
Expired / Lapsed
US
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Light-emitting diode display
Assignee: Zaidan Hojin Handotai Kenkyu Shinkokai
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Filing: 1979-06-25
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Granted: 1981-11-03
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Expires: 1999-06-25
Abstract
Abstract A plurality of light-emitting diodes are connected in series to elevate the working voltage. A plurality of said series connection are connected in parallel to maintain display even upon a disconnection accident. The total number of light-emitting diodes provides a bright and failure-safe colored light display at a low power consumption. The conventional colored-light-emitting display can be easily substituted by the novel light-emitting diode display to reduce the power consumption and elongate the service lifetime.
Inventors
- 👤 Yasuo Okuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:20
CPC Classifications
G; G08; G08B; G08B5/00; G08B5/22; G08B5/36; F; F21; F21K; F21K9/00; F21K9/20; F21K9/23; G08G; G08G1/00; G08G1/09; G08G1/095; G09; G09F; G09F13/00; G09F13/20; G09F13/22; H; H05; H05B; H05B45/00; H05B45/30; H05B45/395; H05B45/50; H05B45/54; F21W; F21W2111/00; F21W2111/02; F21Y; F21Y2115/00; F21Y2115/10; G09F13/04; G09F13/0418; G09F13/0472; G09F2013/222; G09F2013/227; Y; Y02; Y02B; Y02B20/00; Y02B20/30; Y10; Y10S; Y10S362/00; Y10S362/80
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
136 words
A light-emitting diode (LED) lamp comprising: a housing including a lamp base of a predetermined shape adapted for effecting electrical connection to a commercial AC power source, said AC power source having a predetermined maximum voltage; a current-regulating means electrically connected to said lamp base and disposed in said base to facilitate dissipation of heat generated by said current-regulating means through said base; and a display panel connected mechanically to said housing and electrically to said current regulating means and including a multiplicity of light-emitting diodes, groups of said diodes being connected in series, said series connected group having an operating threshold voltage at least about one half of said predetermined maximum voltage said groups being electrically connected in parallel said multiplicity of light emitting diodes being driven simultaneously by the current from said regulating means.
Claim 2
Dependent Claim
136 words
A light-emitting diode (LED) lamp comprising: a housing including a lamp base of a predetermined shape adapted for effecting electrical connection to a commercial AC power source, said AC power source having a predetermined maximum voltage; a current-regulating means electrically connected to said lamp base and disposed in said base to facilitate dissipation of heat generated by said current-regulating means through said base; and a display panel connected mechanically to said housing and electrically to said current regulating means and including a multiplicity of light-emitting diodes, groups of said diodes being connected in series, said series connected group having an operating threshold voltage at least about one half of said predetermined maximum voltage said groups being electrically connected in parallel said multiplicity of light emitting diodes being driven simultaneously by the current from said regulating means.
Claim 3
Dependent Claim
35 words
A light-emitting diode lamp according to claim 1, wherein: said display panel comprises a plurality of display units, each display unit including at least one series connection of substantially the same number of light-emitting diodes.
Claim 4
Dependent Claim
35 words
A light-emitting diode lamp according to claim 2, wherein: said plurality of display units are connected in series and each of said display units includes a parallel connection of a plurality of said series connection.
Claim 5
Dependent Claim
18 words
A light-emitting diode lamp according to claim 2, wherein: said plurality of display units are connected in parallel.
Claim 6
Dependent Claim
27 words
A light-emitting diode lamp according to claim 2, wherein: said plurality of display units are connected in a plurality of series connections which are connected in parallel.
Claim 7
Dependent Claim
31 words
A light emitting diode lamp according to claim 1, 2, 3, 4 or 5, wherein: said display panel comprises a reflector having concave reflecting surfaces registered with the respective light-emitting diodes.
Claim 8
Dependent Claim
78 words
A traffic signal system adapted to be driven by a commercial AC power signal having a predetermined maximum voltage, comprising: a red and a green signal lamp, each signal lamp including a plurality of display units connected in parallel, each display unit including a plurality of series connected light-emitting diodes and a current adjusting means, said plurality of series connected light-emitting diodes having an operating threshold voltage of at least about one half of said predetermined maximum voltage.
Claim 9
Dependent Claim
78 words
A traffic signal system adapted to be driven by a commercial AC power signal having a predetermined maximum voltage, comprising: a red and a green signal lamp, each signal lamp including a plurality of display units connected in parallel, each display unit including a plurality of series connected light-emitting diodes and a current adjusting means, said plurality of series connected light-emitting diodes having an operating threshold voltage of at least about one half of said predetermined maximum voltage.
Claim 10
Dependent Claim
129 words
A light-emitting diode display device adapted to be driven by a commercial AC power source having a predetermined maximum voltage said device comprising: a display surface having a plurality of sections; and a multiplicity of light-emitting diodes disposed in each of said sections, groups of said light-emitting diodes being electrically connected in series such that said group has an operating threshold voltage at least approximately one half of said predetermined maximum voltage, said groups being electrically connected in parallel, means for limiting the current through each group in said section, said light-emitting diodes in each section emitting lights of a single color, said display surface including a first number of sections emitting light of a first color and a second number of sections emitting light of a second color.
Claim 11
Dependent Claim
129 words
A light-emitting diode display device adapted to be driven by a commercial AC power source having a predetermined maximum voltage said device comprising: a display surface having a plurality of sections; and a multiplicity of light-emitting diodes disposed in each of said sections, groups of said light-emitting diodes being electrically connected in series such that said group has an operating threshold voltage at least approximately one half of said predetermined maximum voltage, said groups being electrically connected in parallel, means for limiting the current through each group in said section, said light-emitting diodes in each section emitting lights of a single color, said display surface including a first number of sections emitting light of a first color and a second number of sections emitting light of a second color.
Claim 12
Dependent Claim
26 words
A light-emitting diode display device according to claim 8, wherein: said display surface further includes a third number of sections emitting light of a third color.
Claim 13
Dependent Claim
23 words
A light-emitting diode display device according to claim 8 or 9, wherein: said first color is red and said second color is green.
Claim 14
Dependent Claim
26 words
A light-emitting diode display device according to claim 9, wherein: said first color is red, said second color is green and said third color is yellow.
Claim 15
Dependent Claim
114 words
A light-emitting diode (LED) display adapted to be driven by a commercial AC power source having a predetermined instantaneous maximum voltage (E m ), said display comprising: at least one group of luminescent units, each said luminescent unit comprising a plurality of serially connected LED's, each of said units having an operating threshold voltage (V th ) equal to at least approximately one half of said predetermined maximum voltage (E m ) and being electrically connected in parallel to the other luminescent units in said group so that all units in said group are concurrently driven by said AC power source; and current limiting means for limiting the current through each of said units.
Claim 16
Dependent Claim
114 words
A light-emitting diode (LED) display adapted to be driven by a commercial AC power source having a predetermined instantaneous maximum voltage (E m ), said display comprising: at least one group of luminescent units, each said luminescent unit comprising a plurality of serially connected LED's, each of said units having an operating threshold voltage (V th ) equal to at least approximately one half of said predetermined maximum voltage (E m ) and being electrically connected in parallel to the other luminescent units in said group so that all units in said group are concurrently driven by said AC power source; and current limiting means for limiting the current through each of said units.
Claim 17
Dependent Claim
20 words
Light-emitting diode display according to claim 12, wherein: said plurality of light-emitting diodes simultaneously emit lights of a same color.
Claim 18
Dependent Claim
33 words
Light-emitting diode display according to claim 12, further comprising: a rectifying circuit for rectifying an alternating current from said AC source and supplying a rectified electric power to said parallel connection of units.
Claim 19
Dependent Claim
27 words
Light-emitting diode display according to claim 14, further comprising: a charge-storing means for charging and discharging electric charge, connected between said rectifying circuit and said parallel connection.
Claim 20
Dependent Claim
27 words
Light-emitting diode display according to claim 12, further comprising: a total current-limiting means connected in series with said parallel connection for supplying a limited total current thereto.
Claim 21
Dependent Claim
28 words
Light-emitting diode display according to claim 16, wherein: said current limiting means comprises a current-adjusting resistance in each unit serially connected to said series connection of light-emitting diodes.
Claim 22
Dependent Claim
24 words
Light-emitting diode display according to claim 17, wherein: said total current limiting means includes a current stabilizing circuit for supplying a predetermined constant current.
Claim 23
Dependent Claim
44 words
Light-emitting diode display according to claim 16, further comprising: a housing for accommodating said group of luminescent units, including a lamp base of a predetermined shape for providing electrical connections to said source; said total current-limiting means being thermally connected to said lamp base.
Claim 24
Dependent Claim
26 words
Light-emitting diode display according to claim 12, further comprising: a housing for accomodating said group of luminescent units and for providing electrical connections to said source.
Claim 25
Dependent Claim
17 words
Light-emitting diode display according to claim 12, further comprising: at least one other group of luminescent units.
Claim 26
Dependent Claim
129 words
A light-emitting diode lamp adapted to be driven by chargeable battery, comprising: a housing including a standard lamp base having at least first and second terminals; means for limiting current flowing therethrough and electrically connected to said first terminal, and disposed at least partially in said lamp base such that heat generated by said means for limiting current is dissipated through said lamp base; a light-emitting surface coupled to said housing; and light emitting diode circuitry provided in said light-emitting surface and electrically connected between current-limiting means and said second terminal, the circuitry including a plurality of lines connected in parallel, each line including a current-adjusting resistor and a plurality of light-emitting diodes connected in series, all the light-emitting diodes in said circuitry being arranged to be driven simultaneously.
Claim 27
Dependent Claim
129 words
A light-emitting diode lamp adapted to be driven by chargeable battery, comprising: a housing including a standard lamp base having at least first and second terminals; means for limiting current flowing therethrough and electrically connected to said first terminal, and disposed at least partially in said lamp base such that heat generated by said means for limiting current is dissipated through said lamp base; a light-emitting surface coupled to said housing; and light emitting diode circuitry provided in said light-emitting surface and electrically connected between current-limiting means and said second terminal, the circuitry including a plurality of lines connected in parallel, each line including a current-adjusting resistor and a plurality of light-emitting diodes connected in series, all the light-emitting diodes in said circuitry being arranged to be driven simultaneously.
Claim 28
Dependent Claim
91 words
A light-emitting diode lamp according to claim 22, wherein: said housing includes a third terminal; another means for limiting current flowing therethrough and electrically connected to said third terminal and disposed at least partially in said lamp base with low heat resistance therebetween; and another light-emitting diode circuit provided in said light-emitting surface and electrically connected between said third current-limiting means and said second terminal, said another circuit including a plurality of lines connected indiodes connected in series, al the light-emitting diodes in said circuitry being arranged to be driven simultaneously.
Claim 29
Dependent Claim
27 words
A light-emitting diode lamp according to claim 22 or 23, wherein: said light-emitting surface comprises a reflector having concave reflecting surfaces registered with the respective light-emitting diodes.
Claim 30
Dependent Claim
132 words
A light-emitting diode (LED) display adapted for cooperating with a standard light fixture, comprising: a housing including a base portion configured to cooperate with said standard fixture and to effect first and second respective electrical connections with said fixture; at least one group of luminescent units, each said unit comprising a plurality of LED's and a current adjusting device electrically connected in series, each of said units being electrically connected in parallel between said first electrical connection with said fixture and a common node; and current limiting means, for limiting the current flow therethrough, disposed at least partly within said base portion such that heat generated by said current limiting means is dissipated through said base portion and electrically connected between said common node and said second electrical connection with said fixture.
Claim 31
Dependent Claim
132 words
A light-emitting diode (LED) display adapted for cooperating with a standard light fixture, comprising: a housing including a base portion configured to cooperate with said standard fixture and to effect first and second respective electrical connections with said fixture; at least one group of luminescent units, each said unit comprising a plurality of LED's and a current adjusting device electrically connected in series, each of said units being electrically connected in parallel between said first electrical connection with said fixture and a common node; and current limiting means, for limiting the current flow therethrough, disposed at least partly within said base portion such that heat generated by said current limiting means is dissipated through said base portion and electrically connected between said common node and said second electrical connection with said fixture.
Claim 32
Dependent Claim
112 words
A light-emitting diode (LED) display adapted to be driven by a commercial AC power source having a maximum voltage E m , said display comprising: at least two groups of luminescent units, each group including a plurality of luminescent units connected in parallel and each unit including a plurality of LED's connected in series, the respective groups being connected in series so as to drive all the LED's in the respective groups simultaneously from said AC power source, said series connected groups having an operating threshold voltage at least about one half of said maximum voltage E m ; and current limiting means for limiting the current through each of said units.
Claim 33
Dependent Claim
112 words
A light-emitting diode (LED) display adapted to be driven by a commercial AC power source having a maximum voltage E m , said display comprising: at least two groups of luminescent units, each group including a plurality of luminescent units connected in parallel and each unit including a plurality of LED's connected in series, the respective groups being connected in series so as to drive all the LED's in the respective groups simultaneously from said AC power source, said series connected groups having an operating threshold voltage at least about one half of said maximum voltage E m ; and current limiting means for limiting the current through each of said units.
Claim 34
Dependent Claim
22 words
Light-emitting diode display according to claim 26, wherein: said respective groups of luminescent units have substantially the same electric and optical characteristics.
Claim 35
Dependent Claim
21 words
The display of claim 27 further comprising a current limiting device connected in series with said respective groups of luminescent units.
Claim 36
Dependent Claim
31 words
Light-emitting diode display according to claim 28, wherein: said current limiting means comprises a current-adjusting resistance in each luminescent unit electrically connected in series with said plurality of serially connected LEDs.
Claim 37
Dependent Claim
19 words
Light-emitting diode display according to claim 28 wherein: said current limiting device has a saturating current versus voltage characteristics.
Claim 38
Dependent Claim
22 words
The display of claim 17, 18, or 30 wherein: said operating threshold voltage is at most about 0.9 of said maximum voltage.
Claim 39
Dependent Claim
132 words
A light-emitting diode (LED) display adapted to be driven by an AC power source, said source providing a voltage E ac , where E ac =E m sin wt, said display comprising a plurality of luminescent units, each unit comprising a plurality of series-connected LED's, said LED's emitting substantial light only in response to voltages applied across said unit at least equal to a predetermined operating threshold voltage V th , where V th ≧0.5 E m , means for electrically connecting respective ones of said units in parallel to form respective groups of units; current limiting means for limiting the current through each of said units; and means for electrically connecting said groups of units to said source such that each unit in a group is concurrently drawn by said source.
Claim 40
Dependent Claim
132 words
A light-emitting diode (LED) display adapted to be driven by an AC power source, said source providing a voltage E ac , where E ac =E m sin wt, said display comprising a plurality of luminescent units, each unit comprising a plurality of series-connected LED's, said LED's emitting substantial light only in response to voltages applied across said unit at least equal to a predetermined operating threshold voltage V th , where V th ≧0.5 E m , means for electrically connecting respective ones of said units in parallel to form respective groups of units; current limiting means for limiting the current through each of said units; and means for electrically connecting said groups of units to said source such that each unit in a group is concurrently drawn by said source.
Claim 41
Dependent Claim
14 words
The display of claim 32 wherein each unit further comprises a current limiting resistance.
Claim 42
Dependent Claim
17 words
The display of claim 32 or 33 further comprising means for rectifying said voltage E ac .
Claim 43
Dependent Claim
18 words
The display of claim 34 wherein V th is equal to at least approximately 0.9 E m .
Claim 44
Dependent Claim
13 words
The display of claim 34 wherein V th equals approximately √2×E m .
Claim 45
Dependent Claim
25 words
The display of claim 34 wherein V th equals a value in the range of approximately 0.6 E m to approximately 0.7 E m .
Claim 46
Dependent Claim
20 words
The display of claim 32 or 33 wherein V th is equal to at least approximately 0.9 E m .
Claim 47
Dependent Claim
15 words
The display of claim 32 or 33 wherein V th equals approximately √2×E m .
Claim 48
Dependent Claim
27 words
The display of claim 32 or 33 wherein V th equals a value in the range of approximately 0.6 E m to approximately 0.7 E m .
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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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |