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Create binning tables for colour mixing

Posted: 14 Apr 2009     Print Version  Bookmark and Share

Keywords:EZ-Color  HB LED controllers  colour mixing firmware 

EZ-Color HB LED controllers allow the use of LEDs from different manufacturing bins for high colour accuracy colour mixing lighting applications. This application note by Cypress describes the procedure to build the binning tables in firmware for EZ-Color.

One of the caveats with using HB LEDs is that they come in different bins. Manufacturers sort LEDs into different bins based upon measured flux (luminosity), colour (wavelength), and forward voltage (Vf). This translates to substantial variations in characteristics that must be compensated in the colour mixing algorithm. This document shows the effect on light output when changes in the LED characteristics are not compensated for. An advantage of the colour mixing firmware developed by Cypress is that significant care and cost need not be borne to procure LEDs of the same bin. This is because the algorithm is designed in a manner that drives the LEDs on the basis of their rated characteristics. The use of this firmware helps to maintain the characteristics of light output, irrespective of change in certain LED characteristics such as rated flux (luminosity) and dominant wavelength (colour coordinates).

View the PDF document for more information.





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