DLPC7540: DLPC7540 : How to change RGB Duty Cycles in the Sequence Sets

Hi Jia,

Have you tried using the LED Variation calculation tool? Click the color bars on the right.

Please note 100% blue duty cycle is not allowed here, but you can do something like I have shown above.

-Aaron

Hi Aaron

I have tried to change the RGB Duty Cycles referring to you suggestion

but it did not work

do you have any other suggestions

Need：

Only one UV Led will be used for the 3D printing Application

and the UV led will  consume all DMD time 

So UV led Duty Cycles is 100

Test: On the DLPC7540EVM 

1. There are three Led EN signals 

LED_EN_RED : to enable Red Led

LED_EN_GRN : to enable Green Led

LED_EN_BLU : to enable Blue Led

The three signals are output alternately when all leds are enable

not this three EN signals are On all time

This mechanism is same to LightControl4710 or Pico 4710EVM

This is Blue EN signal and I have changed Duty Cycles to R=G=15 B=70

We all know Pico 4710EVM uses PAD3005 to drive RGB LEDs alternately 

RGB Leds  share a drive circuit so can not be On at the same time

Then I changed  RGB Duty Cycles to R=G=0 B=100 According to TI's suggestion

and

Use Blue EN signal to control/switch UV Led

So I want to transplant the same configures to DLPC7540 from Pico DLP4710

How can I delete the restriction of minimum duty cycles

How can I build the composer project when changed the before configures

PS:   The RGB Duty Cycles can be changed  in the all below three  projects and the version of Composer is 13.xx not 15.xx

Pico DLP4710

ECD DLPC4422 + DLP660TE

ECD DLPC4420 + DLP780TE

Thank you for any help

Best Regards

Jia

Hello Jia,

The team is checking out the chipset capabilities. The challenge is that you are using the Display chipset for a 3D printing industrial application, so the feature set and capabilities are intentionally different. We will need more time to assess the options for you.

Have you also looked at the DLPC900 + DLP500YX chipset?y

Regards,

Matt

Hi Matt

Thank you for you information

We have been developing DLPC900 x 2 + DLP670s /DLP500 products since early last year

Optically compatible with DLP660te

The product will be released in 2022Q3

It will better if the RGB Duty Cycles can be changed to 3D printing Application

I am waiting for your good news

Thank you

Best Regards

Jia

Hi Jia,

OK, thank you for the launch update. Good to see your industrial application doing well.

Again, we will see what is possible with the RGB performance.

Regards,

Matt 

Hi Matt

Thank your for help

This demand directly determines the success or failure of the product

Please help TI to add this function

I am looking forward to your reply

Thank you

Best Regards

Jia

Hi Jia,

Now that you have the XPR working we can assess your current performance and make sure everything is robust and then plan the next steps.

Regards,

Matt

Hi Jia,

We are looking at what is possible with the existing DLPC7540 software and firmware. The sequences and timing settings are fixed now for the best pixel and image quality performance, and I do not see us making changes any time soon.

We should have an answer by tomorrow on how to get the most out of the operation. I would like to reply to you by email and close this thread. Please let me know if you are ok with that.

Thanks,

Matt