hang-the-9 :
You can't mirror your iPad to a Sony Bluray player because the Bluray player does not have a screen, and probably does not have any way of accepting video input. You may want to re-word your question.
Actually, my Samsung Blu-Ray player has a screen mirroring function as well and I also cannot figure out how to use it. I don't think the original question was worded wrong. We're simply wondering how to use this function with our Apple products.