A similar solution itroduced Samsung: AMOLED screens.
Retina is also a very high screen resolution:
- 2560 x 1600 in 13-inch MacBook Pro
- 2880 x 1800 in 15-inch MacBook Pro
- 960 x 640 in iPhone4 / 4s
- 2048 x 1536 in the new iPad
Moreover Retina displays use IPS technology that enables wide viewing angles without loss of image quality.