DLP3010: LED brightness control with duty

Hello, TI Experts,

Our customer sent  us a question about DLP3010.

They start to evaluation with DLP® LightCrafter Display 3010 EVM.

Question:

   Is there any way to LED brightness control with duty like PWM on DLP3010?

They found the explanation of LED brightness control with voltage as below.

  7.3.3 LED Current Control: http://www.ti.com/lit/ds/symlink/dlpa2005.pdf

But they could not  find any explanation of LED brightness with duty like PWM.

So they are considering to add the original PWM-circuit on R,G,B each LED line by using LED_SEL0 and LED_SEL1 signals.

We would appreciate if you tell us the recommended way of LED brightness control with duty like PWM on DLP3010.

Best regards,