LED LIGHT STRIP AND METHOD FOR MANUFACTURING THE SAME
First Claim
1. A light emitting diode(s), LED, light strip comprising:
- a first plurality of LED strings positioned along a length of the LED strip and arranged for being powered in parallel through a first supply path and a first return path, each LED string of the first plurality of LED strings comprising at least one LED of a first type of LED and at least one resistive component of a first type,a second plurality of LED strings positioned along the length of the LED strip and further arranged for being powered in parallel through a second supply path and a second return path, each LED string of the second plurality of LED strings comprising at least one LED of a second type of LED different from the first type of LED, and at least one resistive component of a second type,at least three electrical conductors positioned along the length of the LED strip,wherein a first set of at least two electrical conductors of the at least three electrical conductors are arranged to provide the first supply path and the first return path for the first plurality of LED strings, and a second set of at least two electrical conductors of the at least three electrical conductors are arranged to provide the second supply path and the second return path for the second plurality of LED strings andwherein the three electrical conductors are arranged such that the resistance of the combined supply path and return path of a LED string of the first plurality of LED strings is different from the resistance of the combined supply path and return path of a LED string of the second plurality of LED stringscharacterized in that the first plurality of LED strings and the second plurality of LED strings have different electrical characteristics in at least one of a forward voltage of the LED comprised in the LED string and a drive current of the LED string; and
wherein the first plurality of LED strings comprise a LED type with a higher forward voltage than the LED type comprised in the second plurality of LED strings, and wherein the resistance of the combined supply path and return path of a LED string of the first plurality of LED strings is less than the resistance of the combined supply path and return path of a LED string of the second plurality of LED strings;
orwherein the first plurality of LED strings has a higher drive current than the second plurality of LED strings, and wherein the resistance of the combined supply path and return path of a LED string of the first plurality of LED strings is greater than the resistance of the combined supply path and return path of a LED string of the second plurality of LED strings.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a light emitting diode(s), LED, light strip arranged for providing improved color consistency over its length. The LED light strip comprises LED strings positioned along the length of the LED light strip and powered in parallel, for emitting, for example, red, green, blue and white light. The resistance of the supply and return traces, in combination with variations in the current drawn by or the forward voltage of the various LED and resistors used in the LED strings of different color, causes a voltage drop along these traces leading to inconsistent color rendering. By adjusting the resistivity of the traces, such as through providing return paths having different resistances for LED strings of different color, the consistency of the color rendering can be improved.
24 Citations
13 Claims
-
1. A light emitting diode(s), LED, light strip comprising:
-
a first plurality of LED strings positioned along a length of the LED strip and arranged for being powered in parallel through a first supply path and a first return path, each LED string of the first plurality of LED strings comprising at least one LED of a first type of LED and at least one resistive component of a first type, a second plurality of LED strings positioned along the length of the LED strip and further arranged for being powered in parallel through a second supply path and a second return path, each LED string of the second plurality of LED strings comprising at least one LED of a second type of LED different from the first type of LED, and at least one resistive component of a second type, at least three electrical conductors positioned along the length of the LED strip, wherein a first set of at least two electrical conductors of the at least three electrical conductors are arranged to provide the first supply path and the first return path for the first plurality of LED strings, and a second set of at least two electrical conductors of the at least three electrical conductors are arranged to provide the second supply path and the second return path for the second plurality of LED strings and wherein the three electrical conductors are arranged such that the resistance of the combined supply path and return path of a LED string of the first plurality of LED strings is different from the resistance of the combined supply path and return path of a LED string of the second plurality of LED strings characterized in that the first plurality of LED strings and the second plurality of LED strings have different electrical characteristics in at least one of a forward voltage of the LED comprised in the LED string and a drive current of the LED string; and wherein the first plurality of LED strings comprise a LED type with a higher forward voltage than the LED type comprised in the second plurality of LED strings, and wherein the resistance of the combined supply path and return path of a LED string of the first plurality of LED strings is less than the resistance of the combined supply path and return path of a LED string of the second plurality of LED strings;
orwherein the first plurality of LED strings has a higher drive current than the second plurality of LED strings, and wherein the resistance of the combined supply path and return path of a LED string of the first plurality of LED strings is greater than the resistance of the combined supply path and return path of a LED string of the second plurality of LED strings. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 11)
-
-
6. (canceled)
-
7. (canceled)
-
12. A method of manufacturing a LED light strip, the method comprising:
-
printing at least three traces on a circuit board, the at least three traces arranged for providing at least three electrical conductors positioned along the length of the LED strip, populating the circuit board with a least a first plurality of LED strings positioned along a length of the LED strip and arranged for being powered in parallel through a first supply path and a first return path, each LED string of the first plurality of LED strings comprising at least one LED of a first type and at least one resistive component of a first type, a second plurality of LED strings positioned along the length of the LED strip and further arranged for being powered in parallel through a second supply path and a second return path, each LED string of the second plurality of LED strings comprising at least one LED of a second type, different from the first type of LED, and at least one resistive component of a second type, wherein a first set of at least two electrical conductors of the at least three electrical conductors are arranged to provide the first supply path and the first return path for the first plurality of LED strings, and a second set of at least two electrical conductors of the at least three electrical conductors are arranged to provide the second supply path and the second return path for the second plurality of LED strings; and wherein the three electrical conductors are arranged such that the resistance of the combined supply path and return path of a LED string of the first plurality of LED strings is different from the resistance of the combined supply path and return path of a LED string of the second plurality of LED strings; characterized in that the LED of a first type and the LED of a second type have different electrical characteristics in at least one of a forward voltage of the LED and a drive current of the LED; and wherein the first plurality of LED strings comprise a LED type with a higher forward voltage than the LED type comprised in the second plurality of LED strings, and wherein the resistance of the combined supply path and return path of a LED string of the first plurality of LED strings is less than the resistance of the combined supply path and return path of a LED string of the second plurality of LED strings;
orwherein the first plurality of LED strings has a higher drive current than the second plurality of LED strings, and wherein the resistance of the combined supply path and return path of a LED string of the first plurality of LED strings is greater than the resistance of the combined supply path and return path of a LED string of the second plurality of LED strings. - View Dependent Claims (13)
-
Specification