Light emitting diode circuit and arrangement and device
First Claim
1. A light emitting diode circuit comprising:
- a first sub-circuit comprising at least one first light emitting diode serially connected with a threshold voltage element, the first sub-circuit being connected to a pair of terminals, comprising a first terminal and a second terminal; and
a second sub-circuit comprising at least one second light emitting diode serially connected with a first switch, the second sub-circuit being connected to the pair of terminals in parallel with the first sub-circuit,wherein the first switch, in a conducting state, switches on the second light emitting diode and switches off the first light emitting diode and, in a non-conducting state, switches off the second light emitting diode and switches on the first light emitting diode, andwherein the threshold voltage element is not a light emitting diode, and is configured to increase a first minimum threshold voltage of the first sub-circuit to be greater than a second minimum threshold voltage of the second sub-circuit.
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Accused Products
Abstract
Disclosed are light emitting diode circuits employing first sub-circuits including first light emitting diodes and connected in parallel with second sub-circuits including second light emitting diodes and switches for, in conducting states, switching on the second light emitting diodes and switching off the first light emitting diodes and for, in non-conducting states, switching off the second light emitting diodes and switching on the first light emitting diodes. The first sub-circuits and the second sub-circuits have different signal characteristics such as different minimum threshold voltages to be realized by using different kinds of light emitting diodes, by using different total numbers of serial light emitting diodes, or by adding threshold voltage elements to the first sub-circuits.
30 Citations
19 Claims
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1. A light emitting diode circuit comprising:
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a first sub-circuit comprising at least one first light emitting diode serially connected with a threshold voltage element, the first sub-circuit being connected to a pair of terminals, comprising a first terminal and a second terminal; and a second sub-circuit comprising at least one second light emitting diode serially connected with a first switch, the second sub-circuit being connected to the pair of terminals in parallel with the first sub-circuit, wherein the first switch, in a conducting state, switches on the second light emitting diode and switches off the first light emitting diode and, in a non-conducting state, switches off the second light emitting diode and switches on the first light emitting diode, and wherein the threshold voltage element is not a light emitting diode, and is configured to increase a first minimum threshold voltage of the first sub-circuit to be greater than a second minimum threshold voltage of the second sub-circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light emitting diode circuit, comprising:
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a first sub-circuit comprising at least one first light emitting diode, the first sub-circuit being connected to a first terminal and a second terminal; a second sub-circuit comprising at least one second light emitting diode in series with a first switch, the second sub-circuit being connected to the first and second terminals in parallel with the first sub-circuit, wherein the first switch is configured to switch on the at least one second light emitting diode and switch off the at least one first light emitting diode in a conducting state, and to switch off the at least one second light emitting diode and switch on the at least one first light emitting diode in a non-conducting state; and a third sub-circuit comprising at least one third light emitting diode in series with a second switch, the third sub-circuit being connected to the first and second terminals in parallel with the first and second sub-circuits, wherein the second switch is configured to switch on the at least one third light emitting diode and switch off the at least one first light emitting diode in a conducting state, and to switch off the at least one third light emitting diode and switch on the at least one first light emitting diode in a non-conducting state when the first switch is in the non-conducting state. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for controlling light emitting diodes of a light emitting diode circuit comprising a first sub-circuit comprising a first light emitting diode and connected to a pair of terminals, a second sub-circuit comprising a second light emitting diode and a first switch connected to the pair of terminals in parallel with the first sub-circuit second, and a third sub-circuit comprising a third light emitting diode and a second switch connected to the pair of terminals in parallel with the first and second sub-circuits, the method comprising:
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activating the first light emitting diode by placing the first switch and the second switch to a non-conducting state; activating the second light emitting diode by placing the first switch in a conducting state and the second switch in the non-conducting state; and activating the third light emitting diode by placing the second switch in a conducting state and the first switch in the non-conducting state.
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Specification