How to programme constant current of a LED Driver for various current levels?
If I understand your text you are asking how to control LEDs in the following scenarios:


Continuous backlight dimmable.
Strobed backlight where LEDs strobe in-synch with 3D lenses, also dimmable but at same average brightness as continuous mode.


You seem to think that you will have to use a different peak current for the two situations despite using PWM control. This is incorrect. What you do is set the max current of your system so that at, say, 40% PWM the LEDs are giving the required brightness. When you switch to 3D mode you pulse at 80% PWM but modulate the LEDs at the required strobe rate. Effectively you have a high-speed PWM controlling the average current to the LEDs and a low speed strobe synchronised with your camera.



Upper trace shows LED PWM current waveform during strobed mode. Note long on-time. Lower trace shows continuous LED lighting at half-current thus maintaining same average brightness on a longer time scale.