DLP4710EVM-LC: Vertical Pattern shifted

Hello Derlin,

What is the size of the image you are uploading?

Thanks,

Kyle

Hi Kyle,

These png files are about 80kBytes.

Thanks! 

Derlin

Hi Derlin,

Can you please try by flipping the pattern and see are you seeing the shifted pixel on the same side ?

Thanks,

Navneet

Hi Navneet,

Please see attached screenshots showing two similar patterns (white to black/black to white except center thin black line  ) and their projection respectively.

The lower image of each screenshot is image (or pattern) 2 and the upper is image (pattern) 3. Let's look at pattern 2, the number of wider bars on the right hand side of center thin bar on the pattern file is "15", but projected pattern shows "16". The number of wider bars on the left hand side of center thin line on the pattern file is "16", but projected pattern shows "15"  

I believe EVM starts the patter in the center of the image and causes the pattern shift in half. This does not happen to horizontal bars since it makes no different where to start for horizontal patterns. 

In addition, I read through many posts on this forum, I think my problem is same as below post

e2e.ti.com/.../3065313

Thanks!

Derlin

Hi Navneet,

I attached my vertical pattern files, could you please try them on your end?

Pre and post dark time: 1000us

Exposure time: 8000

Color: RGB

Thank you!

Derlin

Thanks!

Hi Derlin,

I will check and get back to you soon.

Thanks,

Navneet

Hi Navneet,

No problem. I am looking forward to your answer!!

Derlin

Derlin,

Thanks for your patience on this issue. We will provide a response as soon as we run test on our setup.

Regards,

Philippe Dollo

Hi Derlin, and Navneet.

I think it is not shifted, but merged with other pattern, maybe the next one.

I have very similar issue, sometimes EVM resolved itself without any answer :)).

Now I am facing with mixing patterns as attached picture:

Some phenomenons I observed:

1. Only vertical and horizontal patterns => Works fine

2. Mixing with Diagonal pattern => got above issue

3. Generating Bin file:

    - Only vertical and horizontal patterns (I have 34 of them in total):  firmware Bin file size: 1.4MB

    - With above Bin file, add diagonal pattern (8 patterns more): firmware Bin file size: 4.5MB

All patterns are generated in 1bit format, file size is 129kB.

I dont understand why it happened in this way?

Any input for this issue would be appreciated.

Thank you.

Best regards. Bui Quang Lam