TECH NOTES: Avago Technologies - RGB LED color mixing using linear dimming techniques
July 4, 2007
This paper describes RGB LED color mixing control using linear dimming with Avago Technologies' color management controllers, ADJD-J823 and HDJD-J822.
The evaluation circuit consists of the LED backlight driver board, the HDJD-JD04 kit, and a small LED backlight screen. The LED driver board has a field sequencing mode to sequence the RGB colors.
From the results, linear dimming with or without field sequencing is a viable method to achieve precise RGB color control. The maximum du'v' result obtained is 0.006.
One possible application in linear dimming is the DLP projector.
This paper also explains why the pixel memory synchronization can be easily resolved with linear dimming.
Download the Avago paper (PDF, 400K)