# US 10,321,534 B1 · Color error corrected segmented LED array

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- Number: US 10,321,534 B1
- Document ID: US10321534B1
- Status: Granted
- Kind: B1
- Application number: 15/819,413
- Filed: 2017-11-21
- Published: 2019-05-23
- Granted: 2019-06-11
- Earliest claimed: 2017-11-21
- Assignees: Lumileds LLC
- Applicants: Lumileds LLC
- Inventors: Nicola Bettina Pfeffer; Arjen Gerben Van Der Sijde; Brendan Moran
- Web page: https://patentgrep.com/patent/US10321534B1

## CPC

- G03B 15/05: Combinations of cameras with electronic flash apparatus; Electronic flash units
- H05B 45/20: Controlling the colour of the light
- H05B 45/22: using optical feedback
- H05B 45/24: using electrical feedback from LEDs or from LED modules
- H05B 47/11: by determining the brightness or colour temperature of ambient light
- G03B 2215/0567: Solid-state light source, e.g. LED, laser
- H10H 20/851: Wavelength conversion means
- H10H 20/8515: {not being in contact with the bodies}
- H10H 29/14: comprising multiple light-emitting semiconductor components
- H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout}
- Y02B 20/40: Control techniques providing energy savings, e.g. smart controller or presence detection
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A method of color error correction for a segmented LED array is disclosed. The method includes calculating a target luminance for LED segments in a segmented LED array based on an initial luminance pattern, determining a luminance ratio based on the target luminance, the luminance ratio defined as a ratio of a primary luminance value of the primary LED segment to a secondary luminance value of the at least one adjacent LED segment, and comparing the luminance ratio to a predefined threshold ratio. If the luminance ratio is greater than or equal to the predefined ratio, then the secondary luminance value of the at least one adjacent LED segment is maintained. If the luminance ratio is less than the predefined ratio, then the secondary luminance value of the at least one adjacent LED segment is increased.

## Claims

### Claim 1

A method of color error correction for a segmented LED array, the method comprising:
(a) calculating a target luminance for LED segments in a segmented LED array based on an initial luminance pattern;
(b) determining a luminance ratio based on the target luminance, the luminance ratio defined as a ratio of a primary luminance value of the primary LED segment to a secondary luminance value of the at least one adjacent LED segment;
(c) comparing the luminance ratio to a predefined threshold ratio, and
(i) if the luminance ratio is greater than or equal to the predefined ratio, then the secondary luminance value of the at least one adjacent LED segment is maintained, or
(ii) if the luminance ratio is less than the predefined ratio, then the secondary luminance value of the at least one adjacent LED segment is increased.

### Claim 2 (depends on 1)

The method of claim 1, wherein the secondary luminance value of the at least one adjacent LED segment is increased in step (c)(i) until the luminance ratio equals the predefined threshold ratio.

### Claim 3 (depends on 1)

The method of claim 1, wherein the predefined threshold ratio is at least 3% and less than 5%.

### Claim 4 (depends on 1)

The method of claim 1, wherein the predefined threshold ratio is 4%.

### Claim 5 (depends on 1)

The method of claim 1, wherein the segmented LED array includes a phosphor layer and a sapphire layer.

### Claim 6 (depends on 1)

The method of claim 1, wherein the segmented LED array is a 2×1 LED array.

### Claim 7 (depends on 1)

The method of claim 1, wherein the segmented LED array is a 3×3 LED array.

### Claim 8 (depends on 1)

The method of claim 1, wherein the at least one adjacent LED segment includes at least one directly adjacent LED segment and at least one diagonally adjacent LED segment, and the secondary luminance value of the at least one diagonally adjacent LED segment is 40-60% of the secondary luminance value of the at least one directly adjacent LED segment.

### Claim 9 (depends on 1)

The method of claim 1, wherein an adaptive flash process is performed during step (a).