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DLP4710EVM-LC: Strange images in external 1440 Hz mode

Mark Wexler
Intellectual 480 points
Part Number: DLP4710EVM-LC

Hello everyone,

I just got a DLP4710EVM-LC. I connected up the exteral HDMI input, and the images look great.

Then I connected the USB cable and fired up the GUI. The first thing that I noticed is it told me that the firmware version was incorrect. So I downloaded the 1.1.0 firmware on the system's web page and updated. I no longer get these errors.

I then switched into what I was hoping would be 1-bit, 1440 mode. This is what the GUI page looks like.

Here's what the projector's output looked like before switching into this mode: [I can't seem to insert another image, so I'll continue in the next message]

  • 0
    Intellectual 480 points

    Here's what the projector's output looked like before switching into this mode:

    and this is what it looks like after switching into this mode:

    As you can see from the above image, a lot of blocks in the input image are copied over and over in the output image. Also there's a horizontal strip in the bottom half of the output image that flickers.

    I thought that if I switched into a monochrome 1-bit 1440 Hz mode, I should just get a (monochrome) copy of my input image, right?

    Can you tell me what I'm doing wrong?

    Mark

  • 0 in reply to Mark Wexler
    Intellectual 480 points

    P.S. There's one more weird thing I noticed. When I go into Display/Video and Color, and get the video information, it shows

    Although the signal that I'm sending is 1920 x 1080 x 60 Hz (this is what my video card driver is telling me).

  • 0 in reply to Mark Wexler
    Intellectual 480 points

    OK, I've just made some progress on my own. When I go to Display/Display Settings in the GUI, and put "Scale input image to size" to 1280 x 720, and then go to the 1440 Hz monochrome setting on the Light Control page as before, I don't get any distortion or flicker: just a green (or whatever) version of my image centered in the middle of the larger image (like a 720p image centered in a 1080p image). So I guess the trouble is that it thinks I'm sending it 720p image -- whereas I'm really sending a 1080p image.

    So how do I get it to recognize that I'm sending a 1080p image?

  • 0 in reply to Mark Wexler
    Intellectual 480 points
    Sorry, I just realized that my video card wasn't outputing 1080p signal but a 720p signal. When I got a real 1080p signal, the 1440 Hz mode seems to work fine.

    You can probably just delete this whole thread...

    Mark