Methods, apparatus and articles of manufacture to calibrate lighting units

摘要

A system and appertaining method calibrate a color LED light unit comprising at least first-, second-, and third-color LEDs, comprising: a) defining a target color on a color map to calibrate; b) selecting initial calibration coefficients associated with the target color; c) storing the initial or updated calibration coefficients in a non-volatile memory of the light unit; d) controlling the light unit to drive the LEDs to attempt to emit the target color, producing an attempted color, utilizing the calibration coefficients; e) measuring the attempted color to determine if it matches the target color within a predefined tolerance; f) if the attempted color matches the target color, then terminating the method; g) if the attempted color does not match the target color, then performing the following; h) selecting a color component; i) adapting at least one calibration coefficient associated with the selected color component; and j) performing (c)-(i) again.

主权项

1. A method for calibrating a color LED light unit comprising at least first-, second-, and third-color LEDs, comprising:
a) defining a target color on a color map to calibrate that requires a contribution from at least the first- and second-color LEDs, wherein the defined target color is one of at least three target colors and the three colors define a color gamut as three points of vertices of a triangle; b) selecting first and second initial calibration coefficients associated with the first- and second-color contributing LEDs that contribute to the target color; c) storing the initial or updated first and second calibration coefficients in a non-volatile memory of the light unit; d) controlling the light unit to simultaneously drive the first and second LEDs to attempt to emit the target color, producing an attempted color, utilizing the calibration coefficients; e) measuring the attempted color to determine if it matches the target color within a predefined tolerance; f) if the attempted color matches the target color, then terminating the method; g) if the attempted color does not match the target color, then performing the following; h) selecting a color component corresponding to the first-color LED; i) updating the first calibration coefficient associated with the selected color component; j) performing (c)-(f) immediately again; k) if the attempted color does not match the target color, then performing the following; l) selecting a color component corresponding to the second-color LED; m) updating the second calibration coefficient associated with the selected color component; n) performing (c)-(f) again; performing (a)-(j) for one or more target colors of the at least three target colors; measuring a statistically significant plurality of LEDs of each color class; determining a variance for each color class LED; defining a worst case color gamut within a predetermined probability; and defining the three points to specifically bound the worst case color gamut.