DLP4710LC: Calibrate uniformity

Hi John,

Please see the feedback of our customer below.

We want to use this DMD as light source for 3D printer, and sale light source, the device is still in the early stages of development.

For uniformity, the 3D printer cannot work at normal conditions.

The type of DMD is DLPC4710LC, so, we want to know how to calculate uniformity for DLPC4710LC

Regards,

Danilo

Hi Vivek,

He is the response of our customer.

Yes, I have already read all email, it not enough to solve mine problem

Follow TI engineers support, it looks need a light sensor meter integrate with PCB card

So, I want to know how to selection type for light sensor meter and do a circuit design again.

Could u Pls give me more information, e.g., demo case or demo code.

Regards,

Danilo

Hi Danilo,

Our team will need to look into the selection type for light sensor meter and provide you with more information by the end of this week. 

Thanks,

Lori 

Hi Lori,

We would like to request an update to this inquiry.

Regards,

Danilo

Hi Lori,

Please see the feedback of our customer below.

Today, I do an experiment with UV light meter(cl200A chroma cannot work at this bands) to measure the brightness at 9-point, so that I can calculate the gain and bias at each point.

But my wondering is how can transfer this data to DMD?

Do we have commands for that?

Regards,

Danilo

Hi Danilo,

Let me look into how we might be able to support this for your client. I will reply back here with my findings.

Regards,

Austin

Hi Austin,

We would like to request an update to our customer's inquiry.

Regards,

Danilo

Hello Danilo,

We do not yet have a method for inputting this calibration data. Thank you for your patience as we continue to investigate this.

Regards,

Austin

Hello Danilo,

I notice that we may not have understood customer question correctly.  We understand that they are developing a 3D printer optical engine and image uniformity is concern.

Could you please request customer to describe in detail 

 - Proposed logic/flow for managing uniformity especially how they intend to use the calibration data.

- The term "inputting calibration data" to DMD is not well understand; a flow chart may be helpful.

Hopefully this will help us respond to their query more effectively.

regards,

Vivek

Hi Vivek,

Thank you for handling this post. Here is the update from our customer.

Pls see below flowchart

uniformity calibration flowchart.xls

1. measure 9-point dark and white fields by UV light meter.

2.calculate the gain and bias at each point.

3. transfer gain and bias to EVM, so that EVM can automatically adjust the uniformity of the screen.

The project is in the early stage of development, I do an experiment, as follow

1. create a uniform image, the grayscale is 179

2.segment it into 9 regions and the grayscale value of each region multiple gain and plus bias, then create a new image

3.project new image by EVM, measure the value with UV light meter.

4.the minimum of all values divided maximum gives the final measure of uniformity, here is 99.1%.

5. extend 9 points to more than 200 points, and complete the uniformity adjustment

But so far it has nothing to do with EVM itself, so I want to know the commands which can directly transfer gains and biases to EVM, or the other way can achieve the same function.

Regards,

Danilo

Hello Danilo,

Thank you for this information. We will take this into account.

Regards,

John

Hi John,

We would to request an update to our customer's inquiry.

Regards,

Danilo