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Diamond Pixel Pattern Clarification

Cole Wollak
Intellectual 475 points
Other Parts Discussed in Thread: DLP4500

Page 11 here: http://www.ti.com/lit/ug/dlpu011b/dlpu011b.pdf

Shows that "every column" creates a zig-zag pattern horizontally across the sensor. Is this actually "every column AND two rows" filled?

As you can see how the rows are marked in this diagram: http://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files/387/7776.dlp3000_5F00_array.png

It would lead me to believe that "every column" should look like the top left figure where you marked "ever other column."

I understand how every row would create a zig-zag pattern vertically down the sensor but not every column, please clarify.

Thank you,

Cole

  • 0
    TI__Mastermind 47950 points

    Hello Cole,

    Sorry for the delayed answer.

    I can understand the confusion. 

    The discussion in the DLP4500 users guide page 11, that you reference at the beginning, is speaking about how lines appear, but I agree it is not really consistent with what the layout of the DLP4500 Data Sheet shows on page 4.

    The Data Sheet reflects how the DMD is loaded.  The columns form a zigzag vertically (when the long edge is the "top"), but rows are a string of the diamond pixel whose centers all lie in a horizontal line.  When the DMD is loaded it is loaded one "column at a time.  Please see the image below:

    The DMD is loaded by columns [0:911] - shown above as light gray and light blue for different columns.  The order of pixels as they are loaded in the column is shown above by the numbers [0:1139] in the center of pixels in Col 0.

    The discussion in the User's Guide is attempting to describe two different ways that lines (vertical or horizontal) can appear on the DMD.  One way is a string of diamonds, the other is a zig-zag line.

    • In order to make a vertical line that looks like a string of diamonds you would turn on every other pixel in a column.
    • To make a vertical zig-zag you would turn on every pixel in a column.
    • To make a horizontal string of diamonds you would turn on the same pixel in every column.
    • To make a horizontal zig-zag line, you would turn on the same two adjacent pixels in every column.

    I hope this helps.

    Fizix