Looking at the options for LCD screens to be used in our LCD module

We have several displays to check out but we are still waiting for the iPhone 4 to become available.
Will there be much difference between NEC 2.7" QHD and Retina? Pixels per inch are quite different: 400 to 300 but even the current high end moble phone displays at 3.2" inch are almost the same as will the LG/Apple be: About 300+ pixels per inch. Mobile phone displays are cheap when compated to NEC 2.7 that is supposedly used in Sony 12K EVF that is in 12000.00 USD electronic viewfinder. So the only option would be high end mobile display manufacturers like Samsung and LG. Whereas Samsung's Super AMOLED consumes 1/3th less power it actually has less pixels so marketing wise we can not use these - the more statistically the better, right?