US 2014/0210368 A1 · LED ILLUMINATOR APPARATUS, USING MULTIPLE LUMINESCENT MATERIALS DISPENSED ONTO AN ARRAY OF LEDs, FOR IMPROVED COLOR RENDERING, COLOR MIXING, AND COLOR TEMPERATURE CONTROL

Abstract

An LED array includes three or more strings of bare LEDs mounted in close proximity to each other on a substrate. The strings of LEDs emit light of one or more wavelengths of blue, indigo and/or violet light, with peak wavelengths that are less than 490 nm. Luminescent materials deposited on each of the LED chips in the array emit light of different wavelength ranges that are of longer wavelengths than and in response to light emissions from the LED chips. A control circuit applies currents to the strings of LEDs, causing the LEDs in the strings to emit light, which causes the luminescent materials to emit light. A user interface enables users to control the currents applied by the control circuit to the strings of LEDs to achieve a Correlated Color Temperature (CCT) value and hue that are desired by users, with CIE chromaticity coordinates that lie on, or near to the black body radiation curve. Preferably a transparent material is dispensed on the substrate between the LED semiconductor chips to substantially surround the LED semiconductor chips. Thereafter at least one layer containing luminescent materials is applied on the LED semiconductor chips and the transparent material.

Claims30

Dependent claims

An illumination apparatus, comprising:

an LED array, said array including three or more strings of LEDs, wherein said strings of LEDs emit light of one or more wavelengths of blue, indigo and/or violet light, with peak wavelengths that are less than 490 nm;
said LED array comprising bare LED chips that are mounted in close proximity to each other on a substrate;
luminescent materials that are deposited on each of the LED chips in the array, said materials emitting light of different wavelength ranges that are of longer wavelengths than said light emissions from the LED chips, with the emissions from the luminescent materials being in response to such light emissions from the LED chips;
a control circuit that applies currents to the strings of LEDs, causing the LEDs in the strings to emit light, which causes the luminescent materials to emit light;
and
a user interface that enables users to control the currents applied by the control circuit to the strings of LEDs to achieve a Correlated Color Temperature (CCT) value and hue that are desired by users, with CIE chromaticity coordinates that lie on, or near to the black body radiation curve.

3 more elements

An illumination apparatus, comprising:

a substrate;
an LED array on the substrate, said array including three or more strings of unpackaged LED chips, wherein said strings of LED chips emit blue, indigo and/or violet light of different wavelength ranges, with peak wavelengths that are less than 490 nm;
luminescent materials with different emission spectra on the LED chips in the array emitting light in response to light from the LED chips, said materials emitting light of wavelength ranges that are of longer wavelengths than said light emitted by the LED chips;
a control circuit that applies currents to the strings of LED chips, causing the LED chips in the strings to emit light, which causes the luminescent materials to emit light, wherein multiple strings of said strings of LED chips together with the luminescent materials thereon emit light of differing Correlated Color Temperature (CCT) values, different hues, and different CIE chromaticity diagram coordinates. ;
a user interface that enables users to control the currents applied by the control circuit to the three or more strings of LED chips to achieve a CCT value, hue, and CIE chromaticity diagram coordinates that are desired by users, that is located between the CIE chromaticity diagram coordinates of the individual strings of LED chips, said desired CCT value, hue, and CIE chromaticity diagram coordinates being on, or close to, the black body radiation curve;
and

3 more elements

Dependencies are inferred from the claim text.

LED ILLUMINATOR APPARATUS, USING MULTIPLE LUMINESCENT MATERIALS DISPENSED ONTO AN ARRAY OF LEDs, FOR IMPROVED COLOR RENDERING, COLOR MIXING, AND COLOR TEMPERATURE CONTROL

Life of this patent

LED ILLUMINATOR APPARATUS, USING MULTIPLE LUMINESCENT MATERIALS DISPENSED ONTO AN ARRAY OF LEDs, FOR IMPROVED COLOR RENDERING, COLOR MIXING, AND COLOR TEMPERATURE CONTROL

Life of this patent

Abstract

Claims30