# US 2013/0154489 A1 · Lighting Apparatus And Light Emitting Diode Device Thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154489 A1 - Document ID: US20130154489A1 - Status: Published application - Kind: A1 - Application number: 13/720,821 - Filed: 2012-12-19 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Assignees: Everlight Electronics Co., Ltd. - Inventors: Chung-kai Chang; Shun-Chang Li; Cheng Hsi Hung - Web page: https://patentgrep.com/patent/US20130154489A1 ## CPC - H05B 45/28: using temperature feedback - H05B 45/18: using temperature feedback - H05B 45/48: having LEDs organised in strings and incorporating parallel shunting devices - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A lighting emitting diode (LED) device includes a first adjust module and a second adjust module. The first adjust module includes at least one first LED and has a first internal impedance having a first characteristic curve. A range covered by the first characteristic curve includes a first incomplete conduction region and a first conduction region. As the current increases from zero value and up, the first internal impedance decreases exponentially in the first incomplete conduction region, is approximately linear in the first conduction region. The second adjust module includes an impedance-providing component and an electronic component coupled in series. The second adjust module is coupled in parallel with the first adjust module. The second adjust module has a second internal impedance having a second characteristic curve. The first characteristic curve and the second characteristic curve match one another. ## Claims ### Claim 1 A light emitting diode (LED) device, comprising: a first adjustment module having a first internal impedance, the first adjustment module comprising at least one first LED and coupled to receive a first current, a first characteristic curve representing a relationship between the first internal impedance and the first current with a range of the first characteristic curve including a first incomplete conduction region and a first conduction region, wherein in the first incomplete conduction region the first internal impedance decreases exponentially as the first current increases, and wherein the first internal impedance is approximately linear in the first conduction region; and a second adjustment module, comprising an impedance-providing component and an electronic component coupled in series and coupled to receive a second current, the second adjustment module and the first adjustment module coupled in parallel, the second adjustment module having a second internal impedance, a second characteristic curve representing a relationship between the second internal impedance and the second current with a range of the second characteristic curve including a second incomplete conduction region and a second conduction region, wherein in the second incomplete conduction region the second internal impedance decreases exponentially as the second current increases, and wherein the second internal impedance is approximately linear in the second conduction region, wherein the first characteristic curve and the second characteristic curve match one another. ### Claim 2 (depends on 1) The LED device of claim 1, wherein the impedance-providing component comprises a semiconductor component or a thermistor having a positive temperature coefficient. ### Claim 3 (depends on 1) The LED device of claim 1, wherein the electronic component comprises a diode, a Zener diode, an LED, a diode array, a Zener diode array, or an LED array. ### Claim 4 (depends on 1) The LED device of claim 1, further comprising: a third adjustment module that comprises at least one second LED, the third adjustment module coupled in series with the first adjustment module and with the second adjustment module, respectively. ### Claim 5 (depends on 4) The LED device of claim 4, wherein the at least one first LED emits light of a first wavelength, and wherein the at least one second LED emits light of a second wavelength that is different from the first wavelength. ### Claim 6 (depends on 5) The LED device of claim 5, wherein the at least one first LED and the at least one second LED comprise a red LED and a blue LED, respectively. ### Claim 7 A light emitting diode (LED) device, comprising: a first LED array having a first internal impedance and coupled to receive a first current, a first characteristic curve representing a relationship between the first internal impedance and the first current; and a second LED array and an impedance-providing component coupled in series, the serially-coupled second LED array and the impedance-providing component coupled in parallel with the first LED array and receiving a second current, the serially-coupled second LED array and the impedance-providing component having a second internal impedance, a second characteristic curve representing a relationship between the second internal impedance and the second current, wherein the first characteristic curve and the second characteristic curve match one another. ### Claim 8 (depends on 7) The LED device of claim 7, wherein: a range of the first characteristic curve includes a first incomplete conduction region and a first conduction region; in the first incomplete conduction region the first internal impedance decreases exponentially as the first current increases; the first internal impedance is approximately linear in the first conduction region; a range of the second characteristic curve includes a second incomplete conduction region and a second conduction region; in the second incomplete conduction region the second internal impedance decreases exponentially as the second current increases; and the second internal impedance is approximately linear in the second conduction region. ### Claim 9 (depends on 7) The LED device of claim 7, wherein each of the first LED array and the second LED array respectively comprises an array of a plurality of red LEDs. ### Claim 10 (depends on 9) The LED device of claim 9, wherein the first internal impedance is approximately equal to an internal impedance of the second LED array. ### Claim 11 (depends on 7) The LED device of claim 7, wherein the impedance-providing component comprises a semiconductor component or a thermistor having a positive temperature coefficient. ### Claim 12 A light emitting diode (LED) device, comprising: a first LED array having a first internal impedance and coupled to receive a first current, a first characteristic curve representing a relationship between the first internal impedance and the first current with a range of the first characteristic curve including a first incomplete conduction region and a first conduction region, wherein in the first incomplete conduction region the first internal impedance decreases exponentially as the first current increases, and wherein the first internal impedance is approximately linear in the first conduction region; and a second adjustment module coupled to receive a second current, the second adjustment module and the first adjustment module coupled in parallel, the second adjustment module having a second internal impedance, a second characteristic curve representing a relationship between the second internal impedance and the second current with a range of the second characteristic curve including a second incomplete conduction region and a second conduction region, wherein in the second incomplete conduction region the second internal impedance decreases exponentially as the second current increases, and wherein the second internal impedance is approximately linear in the second conduction region, wherein the first characteristic curve and the second characteristic curve match one another. ### Claim 13 (depends on 12) The LED device of claim 12, wherein the second adjustment module comprises an impedance-providing component and an electronic component coupled in series. ### Claim 14 (depends on 13) The LED device of claim 13, wherein the impedance-providing component comprises a semiconductor component or a thermistor having a positive temperature coefficient. ### Claim 15 (depends on 13) The LED device of claim 13, wherein the electronic component comprises a diode, a Zener diode, an LED, a diode array, a Zener diode array, or an LED array. ### Claim 16 (depends on 12) The LED device of claim 12, wherein the second adjustment module comprises a second LED array, and wherein each of the first LED array and the second LED array respectively comprises an array of a plurality of red LEDs. ### Claim 17 (depends on 16) The LED device of claim 16, wherein the first internal impedance is approximately equal to an internal impedance of the second LED array. ### Claim 18 (depends on 12) The LED device of claim 12, further comprising: a third adjustment module coupled in series with the first LED array and with the second adjustment module, respectively. ### Claim 19 (depends on 18) The LED device of claim 18, wherein the first LED array comprises at least one first LED, wherein the third adjustment module comprises at least one second LED, wherein the at least one first LED emits light of a first wavelength, and wherein the at least one second LED emits light of a second wavelength that is different from the first wavelength. ### Claim 20 (depends on 19) The LED device of claim 19, wherein the at least one first LED and the at least one second LED comprise a red LED and a blue LED, respectively.