(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2012/0069560 A1
`(43) Pub. Date:
`Mar. 22, 2012
`Miskin et al.
`
`US 2012O069560A1
`
`(54) MULTI-VOLTAGE AND MULTI-BRIGHTNESS
`LED LIGHTING DEVICES AND METHODS
`OF USING SAME
`
`(75) Inventors:
`
`Michael Miskin, Sleepy Hollow, IL
`(US); Robert L. Kottritsch,
`Shefford (GB)
`
`(73) Assignee:
`
`Lynk Labs, Inc., Elgin, IL (US)
`
`(21) Appl. No.:
`
`13/322,796
`
`(22) PCT Filed:
`
`May 28, 2010
`
`(86). PCT No.:
`
`PCT/US 10/O1597
`
`S371 (c)(1),
`(2), (4) Date:
`
`Nov. 28, 2011
`
`Related U.S. Application Data
`(60) Provisional application No. 61/217.215, filed on May
`28, 2009.
`
`100
`
`
`
`90
`
`v
`
`Publication Classification
`
`(51) Int. Cl.
`(2006.01)
`B60O 1/02
`(2006.01)
`H05K I3/00
`(52) U.S. Cl. ........................................ 362/227; 29/592.1
`(57)
`ABSTRACT
`A single chip multi-voltage or multi-brightness LED lighting
`device having at least two LED circuits having at least two
`LEDs connected seates, and electrically unconnected in a
`parallel relationship, a forward operating dative Voltage of at
`least six volts and are monolithically integrated on a single
`Substrate, configurable by means of connecting the circuits so
`as to provide optional operating Voltage level and/or desired
`brightness level wherein the electrical connection at the LED
`packaging level when the single chips are integrated into the
`LED package Alternatively, the LED package may have
`external electrical contacts that match the integrated chips
`within Optionally allowable, the drive voltage leveland/or the
`brightness level select-ability may be passed on through to the
`exterior of the LED package and may be selected by the LED
`package user, the PCB assembly facility, or the end product
`manufacturer.
`
`102
`
`PGR2023-00016 - Home Depot
`Ex. 1016 - Page 1
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`Patent Application Publication
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`Mar. 22, 2012 Sheet 1 of 8
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`US 2012/0069560 A1
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`PGR2023-00016 - Home Depot
`Ex. 1016 - Page 9
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`

`

`US 2012/0069560 A1
`
`Mar. 22, 2012
`
`MULTI-VOLTAGE AND MULTI-BRIGHTNESS
`LED LIGHTING DEVICES AND METHODS
`OF USING SAME
`
`RELATED APPLICATIONS
`0001. The application is a continuation-in-part of U.S.
`patent application Ser. No. 12/287,267, filed Oct. 6, 2008,
`which claims the priority to U.S. Provisional Application No.
`60/997,771, filed Oct. 6, 2007; this application also claims
`priority to U.S. Provisional Application No. 61/217.215, filed
`May 28, 2009; the contents of each of these applications are
`expressly incorporated herein by reference.
`
`TECHNICAL FIELD
`0002 The present invention generally relates to light emit
`ting diodes (“LEDs) for AC operation. The present invention
`specifically relates to multiple voltage level and multiple
`brightness level LED devices, packages and lamps.
`
`FEDERALLY SPONSORED RESEARCHOR
`DEVELOPMENT
`
`0003. None.
`
`BACKGROUND OF THE INVENTION
`0004. 1. Field of the Invention
`0005. The present invention generally relates to light emit
`ting diodes (“LEDs) for multi-voltage level and/or multi
`brightness leveloperation. The present invention specifically
`relates to multiple voltage level and multiple brightness level
`light emitting diode circuits, single chips, packages and
`lamps “devices” for direct AC voltage power source opera
`tion, bridge rectified AC voltage power source operation or
`constant DC voltage power source operation.
`0006 2. Description of the Related Art
`0007 LEDs are semiconductor devices that produce light
`when a current is supplied to them. LEDs are intrinsically DC
`devices that only pass current in one polarity and historically
`have been driven by DC voltage sources using resistors, cur
`rent regulators and Voltage regulators to limit the Voltage and
`current delivered to the LED. Some LEDs have resistors built
`into the LED package providing a higher Voltage LED typi
`cally driven with 5V DC or 12V DC.
`0008. With proper design considerations LEDs may be
`driven more efficiently with direct AC or rectified AC than
`with constant Voltage or constant current DC drive schemes.
`0009. Some standard AC voltage in the world include
`12VAC, 24VAC, 100VAC, 11 OVAC, 120VAC, 220VAC,
`230VAC, 240VAC and 277VAC. Therefore, it would be
`advantageous to have a single chip LED or multi-chip single
`LED packages that could be easily configured to operate at
`multiple Voltages by simply selecting a Voltage and/or current
`level when packaging the multi-voltage and/or multi-current
`single chip LEDs or by selecting a specific Voltage and/or
`current level when integrating the LED package onto a
`printed circuit board or within a finished lighting product. It
`would also be advantageous to have multi-current LED chips
`and/or packages for LED lamp applications in order to pro
`vide a means of increasing brightness in LED lamps by
`Switching in additional circuits just as additional filaments are
`Switched in for standard incandescent lamps.
`0010 U.S. Pat. No. 7,525.248 discloses a chip-scale LED
`lamp including discrete LEDs capable of being built upon
`electrically insulative, electrically conductive, or electrically
`
`semi conductive substrates. Further, the construction of the
`LED lamp enables the lamp to be configured for high voltage
`AC or DC power operation. The LED based solid-state light
`emitting device or lamp is built upon an electrically insulating
`layer that has been formed onto a Support Surface of a Sub
`strate. Specifically, the insulating layer may be epitaxially
`grown onto the substrate, followed by an LED buildup of an
`n-type semiconductor layer, an optically active layer, and a
`p-type semiconductor layer, in Succession. Isolated mesa
`structure of individual, discrete LEDs is formed by etching
`specific portions of the LED buildup down to the insulating
`layer, thereby forming trenches between adjacent LEDs.
`Thereafter, the individual LEDs are electrically coupled
`together through conductive elements or traces being depos
`ited for connecting the n-type layer of one LED and the p-type
`layer of an adjacent LED, continuing across all of the LEDs to
`form the solid-state light emitting device. The device may
`therefore beformed as an integrated AC/DC light emitter with
`a positive and negative lead for Supplied electrical power. For
`instance, the LED lamp may be configured for powering by
`high Voltage DC power (e.g., 12V, 24V, etc.) or high Voltage
`AC power (e.g., 110/120V. 220/240V, etc.).
`(0011
`U.S. Pat. No. 7,213,942 discloses a single-chip LED
`device through the use of integrated circuit technology, which
`can be used for standard high AC voltage (110 volts for North
`America, and 220 volts for Europe, Asia, etc.) operation. The
`single-chip AC LED device integrates many smaller LEDs,
`which are connected in series. The integration is done during
`the LED fabrication process and the final product is a single
`chip device that can be plugged directly into house or building
`power outlets or directly screwed into incandescent lamp
`sockets that are powered by standard AC voltages. The series
`connected Smaller LEDs are patterned by photolithography,
`etching (such as plasma dry etching), and metallization on a
`single chip. The electrical insulation between small LEDs
`within a single-chip is achieved by etching light emitting
`materials into the insulating Substrate so that no light emitting
`material is present between Small LEDs. The Voltage crossing
`each one of the small LEDs is about the same as that in a
`conventional DC operating LED fabricated from the same
`type of material (e.g., about 3.5 volts for blue LEDs).
`0012. Accordingly, single chip LEDs have been limited
`and have not been integrated circuits beyond being fixed
`series or fixed parallel circuit configurations until the devel
`opment of AC LEDs. The AC LEDs have still however been
`single circuit, fixed single Voltage designs.
`0013 LED packages have historically not been integrated
`circuits beyond being fixed series or fixed parallel circuit
`configurations.
`0014. The art is deficient in that it does not provide a
`multi-voltage and/or multi-current circuit monolithically
`integrated on a single Substrate which would be advanta
`geous.
`0015. It would further be advantageous to have a multi
`Voltage and/or multi-brightness circuit that can provide
`options in voltage level, brightness level and/or AC or DC
`powering input power preference.
`0016. It would further be advantageous to provide mul
`tiple voltage level and/or multiple brightness level light emit
`ting LED circuits, chips, packages and lamps “multi-voltage
`and/or multi-brightness LED devices” that can easily be elec
`trically configured for at least two forward voltage drive
`levels with direct AC voltage coupling, bridge rectified AC
`Voltage coupling or constant Voltage DC power source cou
`
`PGR2023-00016 - Home Depot
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`

`US 2012/0069560 A1
`
`Mar. 22, 2012
`
`pling. This invention comprises circuits and devices that can
`be driven with more than one AC or DC forward voltage
`“multi-voltage' at 6V or greater based on a selectable desired
`operating Voltage level that is achieved by electrically con
`necting the LED circuits in a series or parallel circuit con
`figuration and/or more than one level of brightness “multi
`brightness' based on a Switching means that connects and/or
`disconnects at least one additional LED circuit to and/or from
`a first LED circuit. The desired operating voltage level and/or
`the desired brightness level electrical connection may be
`achieved and/or completed at the LED packaging level when
`the multi-voltage and/or multi-brightness, circuits and/or
`single chips are integrated into the LED package, or the LED
`package may have external electrical contacts that match the
`integrated multi-voltage and/or multi-brightness circuits and/
`or single chips within, thus allowing the drive Voltage level
`and/or the brightness level select-ability to be passed on
`through to the exterior of the LED package and allowing the
`voltage level or brightness level to be selected at the LED
`package user, or the PCB assembly facility, or the end product
`manufacturer.
`0017. It would further be advantageous to provide at least
`two integrated circuits having a forward Voltage of at least
`12VAC or 12VDC or greater on a single chip or within a
`single LED package that provide a means of selecting a
`forward Voltage when packaging a multi-voltage and/or
`multi-brightness circuit using discrete die (one LED chip at a
`time) and wire bonding them into a circuit at the packaging
`level or when packaging one or more multi-voltage and/or
`multi-brightness level single chips within a LED package.
`0018. It would further be advantageous to provide multi
`Voltage and/or multi-brightness level devices that can provide
`electrical connection options for either AC or DC voltage
`operation at preset forward voltage levels of 6V or greater.
`0019. It would further be advantageous to provide multi
`brightness LED devices that can be switched to different
`levels of brightness by simply Switching additional circuits on
`or off in addition to a first operating circuit within a single
`chip and or LED package. This would allow LED lamps to
`switch to higher brightness levels just like 2-way or 3-way
`incandescent lamps do today.
`0020. The benefits of providing multi-voltage circuits of
`6V or greater on a single chip is that an LED packager can use
`this single chip as a platform to offer more than one LED
`packaged product with a single chip that addresses multiple
`Voltage levels for various end customer design requirements.
`This also increase production on a single product for the chip
`maker and improves inventory control. This also improves
`buying power and inventory control for the LED packager
`when using one chip.
`0021. The present invention provides for these advantages
`and solves the deficiencies in the art.
`
`SUMMARY OF THE INVENTION
`0022. According to one aspect of the invention at least two
`single Voltage AC LED circuits are formed on a single chip or
`on a substrate providing a multi-voltage AC LED device for
`direct AC power operation. Each single voltage AC LED
`circuit has at least two LEDs connected to each other in
`opposing parallel relation.
`0023. According to another aspect of the invention, each
`single voltage AC LED circuit is designed to be driven with a
`predetermined forward voltage of at least 6VAC and prefer
`ably each single Voltage AC LED circuit has a matching
`
`forward voltage of 6VAC, 12VAC, 24VAC, 120VAC, or other
`AC voltage levels for each single voltage AC LED circuit.
`0024. According to another aspect of the invention, each
`multi-voltage ACLED device would be able to be driven with
`at least two different AC forward voltages resulting in a first
`forward voltage drive level by electrically connecting the two
`single Voltage AC LED circuits in parallel and a second for
`ward voltage drive level by electrically connecting the at least
`two single voltage level AC LED circuits in series. By way of
`example, the second forward voltage drive level of the serially
`connected AC LED circuits would be approximately twice
`the level of the first forward voltage drive level of the parallel
`connected AC LED circuits. The at least two parallel con
`nected AC LED circuits would be twice the current of the at
`least two serially connected AC LED circuits. In either circuit
`configuration, the brightness would be approximately the
`same with either forward voltage drive selection of the multi
`voltage LED device.
`0025. According to another aspect of the invention, at least
`two single voltage series LED circuits, each of which have at
`least two serially connected LEDs, are formed on a single
`chip or on a substrate providing a multi-voltage AC or DC
`operable LED device.
`0026. According to another aspect of the invention, each
`single voltage series LED circuit is designed to be driven with
`a predetermined forward voltage of at least 6V AC or DC and
`preferably each single Voltage series LED circuit has a match
`ing forward voltage of 6V, 12V, 24V, 120V, or other AC or DC
`Voltage levels. By way of example, each multi-voltage AC or
`DC LED device would be able to be driven with at least two
`different AC or DC forward voltages resulting in a first for
`ward voltage drive level by electrically connecting the two
`single Voltage series LED circuits in parallel and a second
`forward voltage drive level by electrically connecting the at
`least two single voltage level series LED circuits in series.
`The second forward voltage drive level of the serially con
`nected series LED circuits would be approximately twice the
`level of the first forward voltage drive level of the parallel
`connected series LED circuits. The at least two parallel con
`nected series LED circuits would be twice the current of theat
`least two serially connected series LED circuits. In either
`circuit configuration, the brightness would be approximately
`the same with either forward voltage drive selection of the
`multi-voltage series LED device.
`0027. According to another aspect of the invention, at least
`two single Voltage AC LED circuits are formed on a single
`chip or on a Substrate providing a multi-voltage and/or multi
`brightness AC LED device for direct AC power operation.
`0028. According to another aspect of the invention, each
`single voltage AC LED circuit has at least two LEDs con
`nected to each other in opposing parallel relation. Each single
`voltage AC LED circuit is designed to be driven with a pre
`determined forward voltage of at least 6VAC and preferably
`each single Voltage AC LED circuit has a matching forward
`voltage of 6VAC, 12VAC, 24VAC, 120VAC, or other AC
`voltage levels for each single voltage AC LED circuit. The at
`least two AC LED circuits within each multi-voltage and/or
`multi current AC LED device would be left able to be driven
`with at least two different AC forward voltages resulting in a
`first forward voltage drive level by electrically connecting the
`two single Voltage AC LED circuits in parallel and a second
`forward voltage drive level by electrically connecting the at
`least two single voltage level AC LED circuits in series. The
`second forward voltage drive level of the serially connected
`
`PGR2023-00016 - Home Depot
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`

`US 2012/0069560 A1
`
`Mar. 22, 2012
`
`AC LED circuits would be approximately twice the level of
`the first forward voltage drive level of the parallel connected
`ACLED circuits. The at least two parallel connected AC LED
`circuits would be twice the current of the at least two serially
`connected AC LED circuits. In either circuit configuration,
`the brightness would be approximately the same with either
`forward voltage drive selection of the multi-voltage LED
`device.
`0029. According to another aspect of the invention at least
`two single Voltage LED circuits are formed on a single chip or
`on a Substrate, and at least one bridge circuit made of LEDs is
`formed on the same single chip or Substrate providing a
`multi-voltage and/or multi-brightness LED device for direct
`DC power operation. Each single voltage LED circuit has at
`least two LEDs connected to each other in series. Each single
`voltage LED circuit is designed to be driven with a predeter
`mined forward voltage and preferably matching forward volt
`ages for each circuit such as 12VDC 24VDC, 120VDC, or
`other DC voltage levels for each single voltage LED circuit.
`Each multi-voltage and/or multi-brightness LED device
`would be able to be driven with at least two different DC
`forward Voltages resulting in a first forward Voltage drive
`level when the two single voltage LED circuits are connected
`in parallel and a second forward voltage drive level that is
`twice the level of the first forward voltage drive level when the
`at least two LED circuits are connected in series.
`0030. According to another aspect of the invention at least
`two single Voltage LED circuits are formed on a single chip or
`on a substrate providing a multi-voltage and/or multi-bright
`ness LED device for direct DC power operation. Each single
`voltage LED circuit has at least two LEDs connected to each
`other in series. Each single Voltage LED circuit is designed to
`be driven with a predetermined forward voltage and prefer
`ably matching forward Voltages for each circuit such as
`12VAC, 24VAC, 120VAC, or other DC voltage levels for each
`single Voltage LED circuit. Each multi-voltage and/or multi
`brightness LED device would be able to be driven with at least
`two different DC forward voltages resulting in a first forward
`voltage drive level when the two single voltage LED circuits
`are connected in parallel and a second forward Voltage drive
`level that is twice the level of the first forward voltage drive
`level when the at least two LED circuits are connected in
`series.
`0031. According to another aspect of the invention at least
`two single Voltage LED circuits are formed on a single chip or
`on a Substrate, and at least one bridge circuit made of LEDs is
`formed on the same single chip or Substrate providing a
`multi-voltage and/or multi-brightness LED device for direct
`DC power operation. Each single voltage LED circuit has at
`least two LEDs connected to each other in series. Each single
`voltage LED circuit is designed to be driven with a predeter
`mined forward voltage and preferably matching forward volt
`ages for each circuit such as 12VDC 24VDC, 120VDC, or
`other DC voltage levels for each single voltage LED circuit.
`Each multi-voltage and/or multi-brightness LED device
`would be able to be driven with at least two different DC
`forward Voltages resulting in a first forward Voltage drive
`level when the two single voltage LED circuits are connected
`in parallel and a second forward voltage drive level that is
`twice the level of the first forward voltage drive level when the
`at least two LED circuits are connected in series.
`0032. According to another aspect of the invention a
`multi-voltage and/or multi-current AC LED circuit is inte
`grated within a single chip LED. Each multi-voltage and/or
`
`multi-current single chip AC LED LED comprises at least
`two single Voltage AC LED circuits. Each single Voltage AC
`LED circuit has at least two LEDs in anti-parallel configura
`tion to accommodate direct AC Voltage operation. Each single
`Voltage AC LED circuit may have may have at least one
`Voltage input electrical contact at each opposing end of the
`circuit or the at least two single voltage AC LED circuits may
`be electrically connected together in series on the single chip
`and have at least one Voltage input electrical contact at each
`opposing end of the two series connected single Voltage AC
`LED circuits and one Voltage input electrical contact at the
`center junction of the at least two single voltage AC LED
`circuits connected in series. Theat least two single Voltage AC
`LED circuits are integrated within a single chip to form a
`multi-voltage and/or multi-current single chip AC LED.
`0033 According to another aspect of the invention, at least
`one multi-voltage and/or multi-brightness LED devices may
`be integrated within a LED lamp. The at least two individual
`LED circuits within the multi-voltage and/or multi-bright
`ness LED device(s) may be wired in a series or parallel circuit
`configuration by the LED packager during the LED packag
`ing process thus providing for at least two forward Voltage
`drive options, for example 12VAC and 24VAC or 120VAC
`and 240VAC that can be selected by the LED packager.
`0034. According to another aspect of the invention a
`multi-voltage and/or multi-current AC LED package is pro
`vided, comprising at least one multi-voltage and/or multi
`current single chip AC LED integrated within a LED package.
`The multi-voltage and/or multi-current AC LED package pro
`vides matching electrical connectivity pads on the exterior of
`the LED package to the electrical connectivity pads of the at
`least one multi-voltage and/or multi-current single chip AC
`LED integrated within the LED package thus allowing the
`LED package user to wire the multi-voltage and/or multi
`current AC LED package into a series or parallel circuit
`configuration during the PCB assembly process or final prod
`uct integration process and further providinga ACLED pack
`age with at least two forward Voltage drive options.
`0035. According to another aspect of the invention mul
`tiple individual discrete LED chips are used to form at least
`one multi-voltage and/or multi-current AC LED circuit
`within a LED package thus providing a multi-voltage and/or
`multi current AC LED package. Each multi-voltage and/or
`multi-current AC LED circuit within the package comprises
`at least two single Voltage AC LED circuits. Each single
`voltage AC LED circuit has at least two LEDs in anti-parallel
`configuration to accommodate direct AC Voltage operation
`The LED package provides electrical connectivity pads on
`the exterior of the LED package that match the electrical
`connectivity pads of the at least two single voltage AC LED
`circuits integrated within the multi-voltage and/or multi-cur
`rent AC LED package thus allowing the LED package to be
`wired into a series or parallel circuit configuration during the
`PCB assembly process and further providing a LED package
`with at least two forward voltage drive options.
`0036. According to another aspect of the invention a
`multi-voltage and/or multi-current single chip AC LED and/
`or multi-voltage and/or multi current AC LED package is
`integrated within an LED lamp. The LED lamp having a
`structure that comprises a heat sink, a lens cover and a stan
`dard lamp electrical base. The multi-voltage and/or multi
`current single chip AC LED and/or package is configured to
`provide a means of Switching on at least one additional single
`
`PGR2023-00016 - Home Depot
`Ex. 1016 - Page 12
`
`

`

`US 2012/0069560 A1
`
`Mar. 22, 2012
`
`voltage AC LED circuit within multi-voltage and/or multi
`current AC LED circuit to provide increased brightness from
`the LED lamp.
`0037 According to another broad aspect of the invention
`at least one multi-current AC LED single chip is integrated
`within a LED package.
`0038 According to another aspect of the invention, at least
`one single chip multi-current LED bridge circuit is integrated
`within a LED lamp having a standard lamp base. The single
`chip multi-current LED bridge circuit may be electrically
`connected together in parallel configuration but left open to
`accommodate Switching on a Switch to the more than one on
`the single chip and have at least one accessible electrical
`contact at each opposing end of the two series connected
`circuits and one accessible electrical contact at the center
`junction of the at least two individual serially connected LED
`circuits. The at least two individual circuits are integrated
`within a single chip.
`0039. According to another aspect of the invention When
`the at least two circuits are left unconnected on the single chip
`and provide electrical pads for connectivity during the pack
`aging process, the LED packager may wire them into series or
`parallel connection based on the desired Voltage level speci
`fication of the end LED package product offering.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`0040 FIG. 1 shows a schematic view of a preferred
`embodiment of the invention;
`0041 FIG. 2 shows a schematic view of a preferred
`embodiment of the invention;
`0042 FIG. 3 shows a schematic view of a preferred
`embodiment of the invention;
`0043 FIG. 4 shows a schematic view of a preferred
`embodiment of the invention;
`0044 FIG. 5 shows a schematic view of a preferred
`embodiment of the invention;
`0045 FIG. 6 shows a schematic view of a preferred
`embodiment of the invention;
`0046 FIG. 7 shows a schematic view of a preferred
`embodiment of the invention;
`0047 FIG. 8 shows a schematic view of a preferred
`embodiment of the invention;
`0048 FIG. 9 shows a schematic view of a preferred
`embodiment of the invention;
`0049 FIG. 10 shows a schematic view of a preferred
`embodiment of the invention;
`0050 FIG. 11 shows a schematic view of a preferred
`embodiment of the invention; and,
`0051 FIG. 12 shows a schematic view of a preferred
`embodiment of the invention;
`
`DETAILED DESCRIPTION OF PREFERRED
`EMBODIMENTS
`0052 FIG. 1 discloses a schematic diagram of a multi
`voltage and/or multi-brightness LED lighting device 10. The
`multi-voltage and/or multi-brightness LED lighting device
`10 comprises at least two AC LED circuits 12 configured in a
`imbalanced bridge circuit, each of which have at least two
`LEDs 14. The at least two AC LED circuits have electrical
`contacts 16a, 16b, 16c, and 16d at opposing ends to provide
`various connectivity options for an AC Voltage source input.
`For example, if 16a and 16c are electrically connected
`together and 16b and 16d are electrically connected together
`
`and one side of the AC voltage input is applied to 16a and 16c
`and the other side of the AC voltage input is applied to 16b and
`16d, the circuit becomes a parallel circuit with a first operat
`ing forward voltage. If only 16a and 16c are electrically
`connected and the AC Voltage inputs are applied to electrical
`contacts 16b and 16d. a second operating forward Voltage is
`required to drive the single chip 18. The single chip 18 may
`also be configured to operate at more than one brightness
`level “multi-brightness” by electrically connecting for
`example 16a and 16b and applying one side of the line of an
`AC voltage source to 16a ad 16b and individually applying
`the other side of the line from the AC voltage source a second
`voltage to 26b and 26c.
`0053 FIG. 2 discloses a schematic diagram of a multi
`voltage and/or multi-brightness LED lighting device 20 simi
`lar to the multi-voltage and/or multi-brightness LED lighting
`device 10 described above in FIG.1. The at least two AC LED
`circuits 12 are integrated onto a substrate 22. The at least two
`AC LED circuits 12 configured in a imbalanced bridge cir
`cuit, each of which have at least two LEDs 14. Theat least two
`AC LED circuits have electrical contacts 16a, 16b, 16c, and
`16d on the exterior of the substrate 22 and can be used to
`electrically configure and/or control the operating Voltage
`and/or brightness level of the multi-voltage and/or multi
`brightness LED lighting device.
`0054 FIG. 3 discloses a schematic diagram of a multi
`voltage and/or multi-brightness LED lighting device 30 simi
`lar to the multi-voltage and/or multi-brightness LED lighting
`device 10 and 20 described in FIGS. 1 and 2. The multi
`voltage and/or multi-brightness LED lighting device 30 com
`prises at least two AC LED circuits 32 having at least two
`LEDs 34 connected in series and anti-parallel configuration.
`The at least two AC LED circuits 32 have electrical contacts
`36a, 36b, 36c, and 36d at opposing ends to provide various
`connectivity options for an AC Voltage source input. For
`example, if 36a and 36c are electrically connected together
`and 36b and 36d are electrically connected together and one
`side of the AC voltage input is applied to 36a and 36c and the
`other side of the AC voltage input is applied to 36b and 36d.
`the circuit becomes a parallel circuit with a first operating
`forward voltage. If only 36a and 36c are electrically con
`nected and the AC Voltage inputs are applied to electrical
`contacts 36b and 36d. a second operating forward Voltage is
`required to drive the multi-voltage and/or multi-brightness
`lighting device 30. The multi-voltage and/or multi-brightness
`lighting device 30 may be a monolithically integrated single
`chip 38, a monolithically integrated single chip integrated
`within a LED package 38 or a number of individual discrete
`die integrated onto a substrate 38 to form a multi-voltage
`and/or multi-brightness lighting device 30.
`0055 FIG. 4 discloses a schematic diagram of the same
`multi-voltage and/or multi-brightness LED device 30 as
`described in FIG.3 having the at least two AC LED circuits 32
`connected in parallel configuration to an AC voltage source
`and operating at a first forward Voltage. A resistor 40 may be
`used to limit current to the multi-voltage and/or multi-bright
`ness LED lighting device 30.
`0056 FIG. 5 di