# US 2021/0345461 A1 · Light sources that increase object chroma when dimmed

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0345461 A1
- Document ID: US20210345461A1
- Status: Published application
- Kind: A1
- Application number: 17/373,310
- Filed: 2021-07-12
- Published: 2021-11-04
- Earliest claimed: 2017-03-02
- Assignees: The Penn State Research Foundation
- Applicants: The Penn State Research Foundation
- Inventors: Kevin Houser
- Web page: https://patentgrep.com/patent/US20210345461A1

## CPC

- H05B 45/20: Controlling the colour of the light
- H05B 45/10: Controlling the intensity of the light
- H05B 45/395: Linear regulators
- H05B 47/155: Coordinated control of two or more light sources
- H05B 47/19: via wireless transmission
- H10W 90/00: Package configurations
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A method of increasing the color gamut of a multi-emitter light emitting device when dimming includes the steps of independently driving each emitter in the device, and increasing the lumen output of at least one emitter while simultaneously decreasing the lumen output of at least one other emitter, such that total color gamut increases while total lumen output of the light emitting device decreases. A light emitting device is also disclosed.

## Claims

### Claim 1

A method of increasing the color gamut of objects illuminated by a multi-emitter light emitting device when dimming, comprising:
independently driving each emitter in the device; and
increasing the lumen output of at least one emitter while simultaneously decreasing the lumen output of at least one other emitter, such that total color gamut increases while total lumen output of the light emitting device decreases.

### Claim 2 (depends on 1)

The method of claim 1, wherein the plurality of LED emitters includes at least 7 LED emitters.

### Claim 3 (depends on 2)

The method of claim 2, wherein the at least 7 LED emitters include a red emitter, a lime emitter, an amber emitter, a green emitter, a cyan emitter, a blue emitter and an indigo emitter.

### Claim 4 (depends on 1)

The method of claim 1, wherein the plurality of LED emitters includes at least 4 LED emitters.

### Claim 5 (depends on 4)

The method of claim 4, wherein the at least 4 LED emitters include a red emitter, a green emitter, a royal blue (indigo) emitter, and a white emitter.

### Claim 6 (depends on 1)

The method of claim 1, wherein the plurality of LED emitters includes at least 5 LED emitters.

### Claim 7 (depends on 6)

The method of claim 6, wherein the at least 5 LED emitters include a red emitter, a lime emitter, a green emitter, a cyan emitter, and a royal blue (indigo) emitter.

### Claim 8 (depends on 1)

The method of claim 1 further comprising:
decreasing the IES TM-30-15 fidelity index (Rf) as lumen output decreases.

### Claim 9 (depends on 1)

The method of claim 1 further comprising:
decreasing the IES TM-30-15 fidelity index (Rf) from about 96 at full output to about 48 at minimum dimmed level.

### Claim 10 (depends on 1)

The method of claim 1 further comprising:
increasing the IES TM-30-15 gamut index (Rg) as lumen output decreases.

### Claim 11 (depends on 1)

The method of claim 1 further comprising:
increasing the IES TM-30-15 gamut index (Rg) from about 101 at full output to about 140 at minimum dimmed level.

### Claim 12 (depends on 1)

The method of claim 1 further comprising:
decreasing Duv as lumen output decreases.

### Claim 13 (depends on 1)

The method of claim 1 further comprising:
decreasing Duv from about 0.0 at full output to about −0.03 at minimum dimmed level.

### Claim 14 (depends on 1)

The method of claim 1 further comprising:
increasing the IES TM-30-15 chroma shift in hue bin one (Rcs,h1) as lumen output decreases.

### Claim 15 (depends on 1)

The method of claim 1 further comprising:
increasing the IES TM-30-15 chroma shift in hue bin one (Rcs,h1) from about −0.1% at full output to about +35.4% at minimum dimmed level.

### Claim 16 (depends on 1)

The method of claim 1 further comprising:
maintaining a constant correlated color temperature as lumen output decreases.

### Claim 17

A light emitting device comprising:
at least 2 LED emitters;
at least one internal controller;
a plurality of driver circuits configured to independently drive the plurality of LED emitters via the at least one internal controller; and
programming logic configured to increase the lumen output of at least one emitter while simultaneously decreasing the lumen output of at least one other emitter, such that total color gamut of objects illuminated by the light emitting device increases while total lumen output of the light emitting device decreases.

### Claim 18 (depends on 17)

The light emitting device of claim 17, wherein each of the at least 2 LED emitters are configured to emit a different color.

### Claim 19 (depends on 17)

The light emitting device of claim 17, wherein the at least 2 LED emitters are selected from the group consisting of a red emitter, a lime emitter, an amber emitter, a green emitter, a cyan emitter, a blue emitter, an indigo emitter, and a white emitter.

### Claim 20 (depends on 17)

The light emitting device of claim 17, wherein the light emitting device is further configured to decrease the IES TM-30-15 fidelity index (Rf) as lumen output decreases.

### Claim 21 (depends on 20)

The light emitting device of claim 20, wherein the light emitting device is further configured to decrease the IES TM-30-15 fidelity index (Rf) from about 96 at full output to about 48 at minimum dimmed level.

### Claim 22 (depends on 17)

The light emitting device of claim 17, wherein the light emitting device is further configured to increase the IES TM-30-15 gamut index (Rg) as lumen output decreases.

### Claim 23 (depends on 22)

The light emitting device of claim 22, wherein the light emitting device is further configured to increase the IES TM-30-15 gamut index (Rg) from about 101 at full output to about 140 at minimum dimmed level.

### Claim 24 (depends on 22)

The light emitting device of claim 22, wherein the light emitting device is further configured to increase the IES TM-30-15 gamut index (Rg) to at least 120 at a 50% dimmed level.

### Claim 25 (depends on 17)

The light emitting device of claim 17, wherein the light emitting device is further configured to decrease Duv as lumen output decreases.

### Claim 26 (depends on 25)

The light emitting device of claim 25, wherein the light emitting device is further configured to decrease Duv from about 0.0 at full output to about −0.03 at minimum dimmed level.

### Claim 27 (depends on 17)

The light emitting device of claim 17, wherein the light emitting device is further configured to increase the IES TM-30-15 chroma shift in hue bin one (Rcs,h1) as lumen output decreases.

### Claim 28 (depends on 27)

The light emitting device of claim 27, wherein the light emitting device is further configured to increase the IES TM-30-15 chroma shift in hue bin one (Rcs,h1) from about −0.1% at full output to about +35.4% at minimum dimmed level.

### Claim 29 (depends on 17)

The light emitting device of claim 17, wherein the light emitting device is further configured to maintain a constant correlated color temperature as lumen output decreases.

### Claim 30 (depends on 17)

The light emitting device of claim 17, wherein each of the plurality of LED emitters comprises an LED die.

### Claim 31 (depends on 17)

The light emitting device of claim 17, wherein the plurality of LED emitters are arranged in a single LED package.

### Claim 32 (depends on 17)

The light emitting device of claim 17, wherein the light emitting device is a luminaire.

### Claim 33 (depends on 17)

The light emitting device of claim 17, further comprising an external controller interface communicatively connected to an external controller and the internal controller.

### Claim 34

A light emitting device comprising:
at least 2 LED emitters; and
a plurality of driver circuits configured to independently drive the plurality of LED emitters;
wherein the light emitting device emits light at a first fixed output level, the output level having a lower total lumen output than would be emitted if all the LED emitters were driven equally; and
wherein objects illuminated by the light emitting device have a higher color gamut than if all the LED emitters were driven equally.

### Claim 35 (depends on 34)

The light emitting device of claim 34, wherein the light emitting device is also configured to emit light at a second fixed output level, the second fixed output level having a lower total lumen output and a higher total color gamut than the first fixed output level.

### Claim 36 (depends on 34)

The light emitting device of claim 34, wherein the light emitting device is configured to emit light at an ordered set of fixed output levels; and
wherein each subsequent fixed output level in the set has a lower total lumen output and a higher total color gamut of objects illuminated by the light emitting device than all previous fixed output levels in the set.