DLP4710EVM-LC: Adding a dark time between frames when configured for HDMI input

Rodney,

Welcome to the E2E forums and thanks for your interest in our DLP technology.

Can you share any further detail on the frame timing specifications you are looking for?

Regards,

Philippe Dollo

Hi Philippe, I would just like to have some dark time on each frame. Programmable would be best. See the below diagram. I would like to make part of the frame dark (i.e turn off all pixels for a programmable amount of time.)

Rodney,

Have you tried using the DLP4710-LC GUI to program the post-exposure dark time on your patterns? You can find the GUI here:

https://www.ti.com/tool/DLPDLC-GUI

Regards,

Philippe Dollo

Yes, I have, but it can't do what I want it to do. I basically want the projector to run in display mode from the HDMI input but be able to insert a programmable amount of dark time. The external pattern streaming mode can't be configured in the mode I am suggesting because you can't have multiple LEDs during the pattern. For example, turn on red LED for bits 0:7, turn on green LED for bits 8:14, and turn on blue LED for bits 15:23.

Rodney

Rodney,

Thanks for elaborating. I'll review the relevant documentation and give you feedback on the same in the next day or so.

Regards,

Philippe Dollo

Rodney,

I believe you want to display display bits [0:7], [8:15] and [16:23] in different colors, is that right?

If yes, then this is not possible. 

You can display all the 24bits either in R,G, G or RGB colors only. You can checkout the pattern configuration timing diagram of the GUI to get to know all the possible cases of external pattern display. 

Regard,

Mayank 

Hi Mayank, yes, you are correct.  I was also wondering if I can could just configure it for HDMI input mode and simply program a dark time for each frame. It seems like the answer to that is no as well. I could not find any registers that would do that.

Rodney

Rodney,

If I understand your plan, you are considering feeding video data that contains the different colored bits and have the controller add dark time between frames. Is this correct?

Regards,

Austin

Hi Austin, yes, I want to run the EVM as a projector displaying whatever is coming into the HDMI port (i.e. External video port mode) and then add dark time between frames.

Rodney

Rodney,

What you are asking for is a non-standard feature. Can you please accept my friend request on E2E so I can assist you further?

Regards,

Philippe Dollo