Actually, I'm not sure the pixel density is higher on those... here is a 4096x21...

spartango · on Nov 1, 2013

NEC has 21.5" 5MP (2048 x 2560) displays[1], and Barco[2] and EIZO have 30" 10MP (4096 x 2560) displays. These come out to 154 and 161 PPI respectively; you're right that it's not the 180-200ppi target listed, but it's still higher than anything consumer grade.

[1] http://www.necdisplay.com/p/medical-diagnostic-displays/md21...

[2] http://www.barco.com/en/Products-Solutions/Displays-monitors...