Conversation so far:
when did apple come out with retina display
Retina Display was introduced with the iPhone 4 in June 2010.
what is in apple's retina display
Retina Display refers to devices and monitors with a resolution and pixel density so high that a person is unable to discern the individual pixels at a normal viewing distance.
how does apple's retina display work
Apple 'converts' a device's display to Retina by doubling the number of pixels vertically and horizontally, meaning it has four times as many pixels as its non-Retina counterpart.
is the retina display the best display on the market
The Retina display on Apple products isn’t necessarily the best display on the market with high pixel density and a crisp display.

Question: what is an alternative
Self-contained rewrite: what is an alternative to retina display