Theres a seller right now, not me, on Ebay that has 3 Pimax 4K’s for sale. No reserve and bidding started low, around $25
https://www.ebay.com/sch/i.html?_sop=10&_nkw=pimax&_sacat=293&ul_noapp=true
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Not myself. But nice price for sure if you can get it that low. 4k replacement screen for Xperia 5 is something like $60+.
I want an overhead projector. 
What brand are you leaning towards? 4K?
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School like Overhead Projector. Put 4k panel on it with backlight removed. 
Oh a DIY? Does that work??
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One example may not need to remove backlight.
Artograph Tracer Projector And Enlarger https://www.amazon.ca/dp/B000KNHRG2/ref=cm_sw_r_cp_apa_i_h9ddCb6JW4T8N
But more like this
There is also diy projects as well.
Sounds like me, if I dont have a project just ahead of me, then I wouldnt know what to do with myself .
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