COMBINED SERIAL/PARALLEL LIGHT CONFIGURATION AND SINGLE LAYER PCB CONTAINING THE SAME
First Claim
1. An LED illumination assembly comprising:
- a single-conducting-layer PCB having oppositely facing front and rear surfaces;
a first group of LEDs mounted on the front surface of the PCB and connected in both parallel and series with one another by the single conduction layer;
a second group of LEDs mounted on the front surface of the PCB and connected in both parallel and series with one another by the single conduction layer, where the second group is also connected in parallel to the first group by the single conduction layer;
a positive conduction line on the front surface of the PCB and connecting to the first and second groups, where the positive conduction line is defined by the single conduction layer; and
a negative conduction line on the front surface of the PCB and connecting to the first and second groups, where the negative conduction line is defined by the single conduction layer.
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Accused Products
Abstract
An LED circuit using a combination of series and parallel arrangements for optimum current sharing between LEDs. The current paths allow an LED to fail while minimizing the effect on other LEDs and noticeable luminance variance across the circuit. Some embodiments use metallic PCB technology which permits optimal thermal regulation of heat generated by the LEDs. Exemplary embodiments can be used with a single-layer PCB where only one layer of conducting material must be placed on the substrate. This results in a thinner, lighter, and cheaper assembly. The rear surface of the PCB may contain heat sinks or fins and may have air (or other gaseous matter) moved across the surface and/or heat sinks to facilitate cooling of the assembly. An LCD assembly using the same is also disclosed.
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Citations
19 Claims
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1. An LED illumination assembly comprising:
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a single-conducting-layer PCB having oppositely facing front and rear surfaces; a first group of LEDs mounted on the front surface of the PCB and connected in both parallel and series with one another by the single conduction layer; a second group of LEDs mounted on the front surface of the PCB and connected in both parallel and series with one another by the single conduction layer, where the second group is also connected in parallel to the first group by the single conduction layer; a positive conduction line on the front surface of the PCB and connecting to the first and second groups, where the positive conduction line is defined by the single conduction layer; and a negative conduction line on the front surface of the PCB and connecting to the first and second groups, where the negative conduction line is defined by the single conduction layer. - View Dependent Claims (2, 3, 4, 5)
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6. An LED circuit comprising:
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a power source; a positive conduction line connected to the power source; a first group of LEDs connected in parallel with each other and connected to the positive conduction line; a second group of LEDs connected in parallel with each other and connected to the first group of LEDs in series; a third group of LEDs connected in parallel with each other and connected to the second group of LEDs in series; a fourth group of LEDs connected in parallel with each other and connected to the positive conduction line; a fifth group of LEDs connected in parallel with each other and connected to the fourth group of LEDs in series; a sixth group of LEDs connected in parallel with each other and connected to the firth group of LEDs in series; and a negative conduction line connected to the third and sixth groups of LEDs and returning to the power source. - View Dependent Claims (7, 8)
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9. An LED illumination assembly comprising:
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a substrate having front and rear sides; a layer of dielectric material placed on the front side; a single layer of conductive material placed atop the layer of dielectric material and electrically connecting; a positive conduction line; a first group of LEDs connected in parallel with each other and connected to the positive conduction line; a second group of LEDs connected in parallel with each other and connected to the first group of LEDs in series; a third group of LEDs connected in parallel with each other and connected to the second group of LEDs in series; a fourth group of LEDs connected in parallel with each other and connected to the positive conduction line; a fifth group of LEDs connected in parallel with each other and connected to the fourth group of LEDs in series; a sixth group of LEDs connected in parallel with each other and connected to the firth group of LEDs in series; and a negative conduction line connected to the third and sixth groups of LEDs. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A liquid crystal assembly comprising:
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a liquid crystal cell; a backlight assembly placed behind the liquid crystal cell, the backlight assembly having; a single-layer PCB having oppositely facing front and rear surfaces; a positive conduction line on the PCB; a power source electrically connected to the positive conduction line; a plurality of LEDs attached to the front surface of the single-layer PCB and electrically connected such that; a first group of LEDs connected in parallel with each other and connected to the positive conduction line; a second group of LEDs connected in parallel with each other and connected to the first group of LEDs in series; a third group of LEDs connected in parallel with each other and connected to the second group of LEDs in series; a fourth group of LEDs connected in parallel with each other and connected to the positive conduction line; a fifth group of LEDs connected in parallel with each other and connected to the fourth group of LEDs in series; a sixth group of LEDs connected in parallel with each other and connected to the firth group of LEDs in series; and a negative conduction line connected to the third and sixth group of LEDs and returning to the power source. - View Dependent Claims (16, 17, 18, 19)
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Specification