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DLP4500NIR: What happened the mirror with HDMI video mode

Part Number: DLP4500NIR


I want to use DMD to make single pixel imaging with DLP4500NIR.

Now, I use the DMD as a second screen with HDMI. After the DMD displays the bitmap of 1bit-depth , the detector detects the light intensity.

1.As a test, I made a 1140*912 bitmap with all 1 value and display a second monitor on Full Screen mode .

When I see the intensity graph (please, see the red line of the attached images) , Sometimes the value increases rapidly.

I don't know why. And Could you tell me the way to fix them?

2.A similar question as no1. I made the bitmap with 0 or 1 and then used the detector to capture its signal intensity.

But I could not get a stable values. Was that caused by video mode setting? What is the best way to display the 1bit-deapth bitmap image?

Thank you,