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DLP4500: Prolems with displaying 6 bit deep images in patter mode

Maarten Kamermans
Prodigy 20 points
Part Number: DLP4500

We have modified the DPL4500 such that it has 4 LEDs (R, G, B, UV) powered by an external driver and triggered by the DLP4500. We are generating in Matlab images consisting of 4 layers of 6 bit deep. These images are mapped into 3 images of 8 bit depth and send to the DLP4500. If we load these images in the flash memory we indeed can drive the four LEDs independently, showing that the remapping from 4 layer 6 bit images to 3 layer 8 bit images works properly. However, if we stream these images using HDMI, colors are mixed. There seems to be some remapping of the bits by the video card. We once got the HDMI stream to work when we reinstalled the driver of the video card. However, the next day the problems were back again and could not be resolved by reinstallation of the driver. What could be the problem and how can I prevent this problem to happen?

Operating system: Windows 10

Video card: Redeon RX480

Software: Matlab

Computer: HP Z240

Below the settings of the DLP4500 in pattern mode.

  • 0
    TI__Mastermind 20045 points

    Hello Maarten,

    So to confirm, you have the expected operation when using the images loaded from flash memory? Do you have a different computer or graphics card to try the HDMI input streaming? If it worked at one point on the PC it obviously sounds like a graphics driver issue. Have you reached out to AMD to see if their graphics card supports this type of output? Graphics cards may apply image processing functions such as gamma encoding and compression. 

    Thanks,
    Kyle

  • 0 in reply to Kyle Rakos
    Prodigy 20 points

    Hi Kyle,

    We solved the problem. It was the color temperature that could be set in the graphics driver. When set to 6500 K. the system works fine.

    Maarten