# US 12,191,286 B2 · Chip-on-board design with color mixing

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- Number: US 12,191,286 B2
- Document ID: US12191286B2
- Status: Granted
- Kind: B2
- Application number: 18/174,458
- Filed: 2023-02-24
- Published: 2023-10-19
- Granted: 2025-01-07
- Earliest claimed: 2015-03-16
- Assignees: Bridgelux, Inc.
- Applicants: Bridgelux, Inc.
- Inventors: Vladimir Odnoblyudov; Cem Basceri; Peng Chen
- Web page: https://patentgrep.com/patent/US12191286B2

## CPC

- H10W 90/00: Package configurations
- F21K 9/23: Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
- F21L 4/027: {the light sources being a LED}
- F21W 2131/103: of streets or roads
- F21Y 2115/10: Light-emitting diodes [LED]
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21L: LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
- F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

Some embodiments of the disclosure provide for a lighting system including a substrate. The lighting system includes several blue light emitting diodes (LEDs) supported by the substrate. The lighting system includes at least one red LED supported by the substrate. The lighting system includes a light conversion material covering the blue LEDs and the at least one red LED.

## Claims

### Claim 1

A lighting system, comprising:
a substrate;
a first string of light emitting diodes (LEDs) comprising a plurality of blue light emitting diodes (LEDs) supported by the substrate and at least one red LED supported by the substrate, wherein the at least one red LED is surrounded by the plurality of blue LEDs;
a second string of LEDs electrically parallel to the first string of LEDs, wherein the second string of LEDs comprises a plurality of blue LEDs and at least one red LED; and
a light conversion material covering the plurality of blue LEDs and the at least one red LED on the first string.

### Claim 2 (depends on 1)

The lighting system of claim 1, wherein the second string of LEDs is supported by the substrate and covered by the light conversion material.

### Claim 3 (depends on 1)

The lighting system of claim 1, wherein a current applied to the first string of LEDs is greater than 0.1 mA.

### Claim 4 (depends on 1)

The lighting system of claim 1, wherein a current applied to the first string of LEDs is greater than 0.1 mA and less than or equal to 1 mA.

### Claim 5 (depends on 1)

The lighting system of claim 1, wherein a number of the red LEDs in the first string of LEDs is associated within an efficacy tolerance.

### Claim 6 (depends on 1)

The lighting system of claim 1, wherein the plurality of blue LEDs are driven by a first driver and the at least one red LED is driven by a second driver.