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TCL has a 39 inch model available I don't own it though so I can't comment on it but I guess the screen is Skyworth one.
Universal Tcon's are rarely any good.They would either need to add a DisplayPort-Only Timing Controller or use a TCON which supports both HDMI and DisplayPort.
The following WQXGA DisplayPort TCON costs $7 in 100k quantities.
http://www.paradetech.com/products/displayport-lcd-timing-controller-products/dp628-4-lane-dp-tcon/
Even with a DisplayPort TCON, it would be restricted to 4K@30p since there isn't any DP TCONs that can handle 4K@60p shipping yet.
They really should be bringing these things out with dual TCONs like the ASUS PQ321Q and Sharp monitors while we wait for the 4K@60p silicon to be taped out.