What are tiny yellow white bug or parasite that crawl across my iPad screen?

So I put my iPad under my bed every night cuz that is where I charge it. But today I notice a lot of this tiny yellow white tiny bug crawl around my screen. At first I thought it was dirt, but than I relize dirt can't crawl. At first I was thinking it was bed bug ( since it was under my bed) but I can't find any on my bed, but this thing seem to be way smaller than bug bed. Here's a thing tho, I only seen it on my iPad screen, but not anywhere else. They are just crawling around my iPad screen, they don't appear anywhere else other than my iPad. So what are this thing called?

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