"French manufacturer MicroOLED has announced a 5 million dot OLED suitable for use as an electronic viewfinder - far beyond the resolution of the current best units used in recent Sony cameras. The 5.2M effective dots mean it can display 1280x1024 pixel resolution in color, assuming a four-dots-per-pixel layout. Imaging Resource has written an article in which they suggest it could spell the end of the optical viewfinder.
They also point out that the company (majority owned by French defense company Photonis), is targeting the high-end photography, industrial and military markets with its product, rather than the more mass-market products in which Sony has included its 1024x768 pixel (2.8M dot) OLED viewfinders."