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DLP LightCrafter 6500 Evaluation Module / eliminate inhomogeneous illumination of the Chip with frequency on each mirror?

Admir Asanoski
Prodigy 115 points

Hi all

ive got an urgent question. I bought the DPL6500 evaluation module. I illuminate the DLP chip and image the chip with an objective on a plane.

My Problem now: On the imaging plane i didnt have on each pixel the same intensity (see attached picture). Can i eliminate this problem with a pattern frequency of each mirror? Can i controll each mirror with an other frequency? If yes, how can i controll it? Is it also possible to work with grayscale? If yes, how can i work with a grayscale?

At the moment i use the free software to controll the Chip. I work in the "pattern on the fly mode" (see attached picture).

I hope you can help me.

Thank you in advance

Admir

 

 

  • 0
    TI__Genius 13235 points
    Hi Admir,

    I'm moving your question to the forum where we are currently supporting LightCrafter6500 questions and discussions.

    Thanks,
    Clinton
  • 0
    TI__Expert 6370 points

    Hello Admir,

    I am not sure I completely understand all of your questions, so feel free to follow up if I don't cover what you are looking for.

    Yes, you can use gray scale. The result of using gray scale, as you suggest, would be that the pixels would show up with different intensity when integrated over time. I see in the picture above (thank you for attaching the picture, it is helpful) that you are using a 1-bit depth image. This uploaded image appears black and white as is set as 1-bit depth. If you upload a gray scale image, and change the bit depth drop down box in the GUI to 8, for example, the DMD will display the gray scale image.

    For more help, the LightCrafter 6500 & 9000 User's Guide has more information on using the GUI.

    As does this series of videos:

    Part 1

    Part 2

    Part 3

    Best regards,

    Trevor

  • 0 in reply to Trevor Dowd
    Prodigy 115 points

    Hi Trevor,

    thank you for your answer! Can you tell me how can i create a gray scale picture? At the moment i draw the pictures with PAINT and save the files as a 256-Bitmap Datatype. ( have you got a better software solution to draw pictures?) .

    Whats the different of Bit depth 1-8? When i use which bit depth?

    i hope my last question :) : why i have in the projected image a frame? This frame is no in my picture (see attached picture).

    Thank you in advance Trevor!!

    Best regards

    Admir

     

  • 0 in reply to Admir Asanoski
    TI__Expert 6370 points
    Hi Admir,

    Looking at it more closely, in addition to a "frame" appearing around your image, the image seems to be inverted. What is white in the preview GUI image is black and black is white. Knowing this, I believe your illumination is coming from the opposite side that it should be. With your illumination 180 degrees off, you are illuminating the "off-state" mirrors.

    As background for what's happening, the active DMD array of mirrors is surrounded by a few rows of mirrors that remain in the off state during operation, we call this the Pond of Mirrors or the POM (this should be covered in the array characteristics of the datasheet). With your illumination coming from the opposite angle, you are illuminating the areas of the image that should appear black, including the POM.

    Therefore, if you flip your DMD or optics 180 degrees, this problem should go away.

    Let me know if you have any other issues.

    Best regards,
    Trevor
  • 0 in reply to Trevor Dowd
    Prodigy 115 points

    Hi Trevor,

    ahh now i know what you mean! Thanks!

     

    Can you anything tell about about question 1 and 2 ?

    1.  Can you tell me how can i create a gray scale picture?Have a gray scale picture also a Bitmap Datatype? 

    At the moment i draw the pictures with PAINT and save the files as a 256-Bitmap Datatype. ( have you got a better software solution to draw pictures?) .

    2. Whats the different of Bit depth 1-8? When i use which bit depth?

    Thanks in advance!

     

    Best regards

    Admir

  • 0 in reply to Admir Asanoski
    TI__Expert 6370 points

    Hi Admir,

    1. There are many image editors available, you can do a search to find one that works for you. It is also possible to edit your image in paint. Just use different shades of black, white, and gray. Have the image in Paint look just like the image you would like to project. Paint should allow you to save it in a few different bitmap formats. You can choose 24 bit, and set the bit depth to your preferred value in the GUI when you set your pattern settings.

    2. A 1-bit depth image is monochrome, only black and white, there is no gray. Increasing the bit depth allows increasing shades in the image. There are a lot of great resources online for learning about bit depth, let me know if you cannot find any good ones or have further questions on it. The downside to increasing the bit depth on DLP devices is that it limits the maximum pattern speed, check out the LightCrafter DLP6500 and 9000 User's Guide for more information.

    Best regards,

    Trevor