Acicular ITO for LED array
First Claim
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1. In an array of LEDs coupled between a transparent substrate and an electrode, the improvement comprising:
- a region of acicular ITO between at least one LED and the transparent substrate for electrically coupling to the light emitting surface of the LED.
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Abstract
In an array of LEDs coupled between a transparent substrate and an electrode, a light emitting surface of each LED is in electrical contact with a region of acicular ITO. By contacting the light emitting surface of the die, the acicular ITO also provides light scattering. The contact regions are interconnected to form the array. The acicular ITO acts as a ballast resistance for each die and the resistance can be trimmed for more uniform current among the LEDs. Because each LED is individually ballasted, the LEDs in an array can be driven in any pattern or all simultaneously at a consistent brightness.
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Citations
12 Claims
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1. In an array of LEDs coupled between a transparent substrate and an electrode, the improvement comprising:
a region of acicular ITO between at least one LED and the transparent substrate for electrically coupling to the light emitting surface of the LED. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light emitting device comprising:
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a semiconductive die having a junction that emits light through a surface of the die when the junction is forward biased;
a layer of acicular ITO on said surface.
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8. A method for making an array of light emitting diodes, said method comprising the steps of:
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forming a plurality of conductive areas on a substrate, wherein each conductive area is acicular ITO;
attaching an LED on each conductive area; and
positioning each LED in such a way that a light emitting surface of the LED is in contact with the acicular ITO. - View Dependent Claims (9)
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10. In an array of LEDs, each including a p-n junction and a conductor for supplying current to at least one p-n junction, the improvement comprising:
a region of acicular ITO between one side of at least one p-n junction and said conductor for electrically coupling the p-n junction to the conductor. - View Dependent Claims (11, 12)
Specification