Method and apparatus for correcting optical non-uniformities in a light emitting diode
First Claim
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1. A light emitting diode (LED), comprising:
- an LED die that emits light in an optical path; and
a filter disposed in the optical path, wherein the filter changes at least one of the color and the intensity of the emitted light, wherein the filter has a filter pattern that changes at least one of the color and the intensity of the emitted light, wherein the filter pattern is generated based on a shift value corresponding to a deviation between at least one of the color and intensity of the emitted light from a reference, further comprising a lens in the optical path, wherein the filter pattern is a printed ink pattern on a surface of the lens, wherein the printed ink pattern includes at least one of a first pattern in a first ink color, a second pattern in a second ink color, and a third pattern in a neutral density ink, wherein the first pattern attenuates wavelengths longer than a first threshold and the second pattern attenuates wavelengths shorter than a second threshold.
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Abstract
The invention adjusts the spectral characteristics of a light emitting diode (LEDs) by placing a filter in the LEDs light emission path. The filter is printed on the lens of the LED or printed on a cap that is later attached to the LED via ink jet printing or another printing method. The specific ink colors selected for the filter depend on the deviation of each LED from a specified tolerance. The filters create a high degree of color and intensity uniformity without requiring labor and cost-intensive binning.
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Citations
14 Claims
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1. A light emitting diode (LED), comprising:
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an LED die that emits light in an optical path; and
a filter disposed in the optical path, wherein the filter changes at least one of the color and the intensity of the emitted light, wherein the filter has a filter pattern that changes at least one of the color and the intensity of the emitted light, wherein the filter pattern is generated based on a shift value corresponding to a deviation between at least one of the color and intensity of the emitted light from a reference, further comprising a lens in the optical path, wherein the filter pattern is a printed ink pattern on a surface of the lens, wherein the printed ink pattern includes at least one of a first pattern in a first ink color, a second pattern in a second ink color, and a third pattern in a neutral density ink, wherein the first pattern attenuates wavelengths longer than a first threshold and the second pattern attenuates wavelengths shorter than a second threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus having at least one light emitting diode (LED), comprising:
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at least one LED die that emits light in an optical path;
at least one LED lens in the optical path of said at least one LED die; and
at least one filter disposed on said at least one LED lens, wherein the filter is a printed ink pattern that changes at least one of the color and the intensity of the emitted light, wherein the filter pattern is generated based on a shift value corresponding to a deviation between at least one of the color and intensity of the emitted light from a reference, wherein the printed ink pattern includes at least one of a first pattern in a first ink color, a second pattern in a second ink color, and a third pattern in a neutral density ink, wherein the first pattern attenuates wavelengths longer than a first threshold and the second pattren attenuates wavelengths shorter than a second threshold. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification