With the Edge, Samsung is offering a practical use for the curvature. While the main screen remains flat like previous phones, the right edge extends and curves until it reaches the back. That creates a side display so information such as weather and time can be seen from the side when the phone is laid on a table or nightstand.
With the side display, the phone's camera functions more like a stand-alone, point-and-shoot camera, as the shutter button and other functions appear on top when the phone is held horizontally.
The side display also provides one-tap access to various apps and functions normally found on the home screen, like the flashlight and stopwatch, akin to what Apple offers in the iPhone's Control Center with a swipe up from the bottom. Samsung will look to app developers to find new ways to use the feature.
Samsung didn't announce prices. In the U.S., last year's Galaxy Note 3 went for about $700 without a contract, or $300 with one. Prices are likely to be similar when the Note 4 comes out in October through all four national carriers in the U.S. The Edge will likely cost more.
Analysts said the new display feature could cut both ways.
"An edge-based display will give Samsung's smartphone clear differentiation in a crowded market," said Ian Fogg, an analyst covering the mobile industry at IHS in London. "But for Samsung to maximize the potential of an edge display it needs third party apps to support the display with additional Samsung-specific functions," he said.
If the South Korean giant wants to avoid paying developers to kick start the development of such apps, it might have to make the feature standard across its broad smartphone portfolio, said Fogg.
Samsung made the announcements at the IFA trade show, one of the world's longest-running showcases for consumer electronics and home appliances.
The new phones were announced amid expectations that Apple will unveil new iPhones next week. The iPhone 6 is expected to feature a 4.7-inch screen, up from the current 4 inches, to make it more competitive with larger smartphones made by Samsung and other companies. There has been speculation that Apple may also unveil an iPhone with a 5.5-inch screen.
Samsung's Galaxy S5, which came out in April, has a 5.1-inch screen. The Note is Samsung's line of larger phones and emphasizes note-taking with an included stylus. The Note 4 will have a 5.7-inch screen, while the Edge's will be 5.6 inches. To support such power-hungry large screens, Samsung says it has improved battery life.
Samsung news hits Apple
Apple shares are getting bit by a rival.
The iPhone maker's stock fell more than 4 percent Wednesday after Samsung unveiled two new smartphones at a trade show in Berlin. Samsung's unveiling came less than a week before Apple will reveal its new products a larger iPhone and possibly a computerized watch next Tuesday.