The screen on the Samsung Galaxy S4 is state of the art, and has many useful traits. At 5", it's amongst the largest in the smartphone world, making it ideal for sharing with family and friends, typing, and viewing hi-res content. In fact, Samsung has given the screen a resolution boost, so it now plays back at 1080p full HD, so it's ideal for viewing any true HD content. Where with an older Galaxy S3 you get some slight roughness to images as that screen is only 720p, the new display is perfectly smooth - the pixels that make the screen are so small and tightly packed your eyes physically cannot see them, giving an ultra sharp image. The new screen is also brighter, so performs better in sunlight, but also offers more accurate colour reproduction, so the colours of say your pet dog will be just as they are in real life. In fact, thanks to Adapt Display, the Galaxy S4 can automatically adjust the colours it's displaying to better suit whatever it is you're looking at.
It doesn't stop there. The Samsung Galaxy S III, which uses the same AMOLED technology, had a slight blue/green tint if the screen was viewed at an angle, for example if showing a friend a YouTube™ video. Long story short, due to the way AMOLED screens are made, this was a common downside. Samsung has managed to completely overcome this problem, so the S4's display keeps perfect colour representation from any angle. The final really important feature of the screen is energy efficiency. On an AMOLED display, each colour is made using a combination of red, blue and green pixels, with black colours actually being the result of pixels being turned off. This means that darker colours use less energy as the pixels are shut down. This means AMOLED screens use less power than LCD displays - although remember that AMOLEDs are less efficient for displaying white and very light colours.
The display of the Samsung Galaxy S4 is of course for controlling the phone and viewing content, but the new, larger 5" screen has also had a resolution boost to 1080p HD. First, what does the larger screen let you do? It makes sharing content easier, and really lets the phone act as a true movie watching device as it's more comfortable for your eyes to look at for longer periods. It's also a great games machine, with graphics enlarged and more on-screen space for controls. Like editing your photos and videos? The wider and higher display makes that easier too. Need to do a lot of messaging? The huge keyboard is designed for easy, fast and error-free typing.
The high resolution of the screen basically makes the screen sharper, so sharp in fact that everything is super smooth as your eyes can't detect the pixels that make the screen. At 1080p HD, it's ideal for full HD content like movies, but because of the sharpness, it's a great eReader. Your eyes will find the smoothness much less taxing so you won't get eye strain. A large, sharp screen is also absolutely ideal for web surfing; everything is easy to touch and swipe, and visual content looks superb.
It's also worth remembering that when the screen displays black, this is true black as the pixels are turned off. This means that the screen gives perfect black reproduction, as well as fantastic contrast. If you watch a lot of content that features dark settings, like vampire shows or photos shot at night, it's a real bonus.
The Super AMOLED display of the Samsung Galaxy S4 is made of an arrangement of pixels coloured red, blue and green. When these light up, they blend to make all the colours you see. The darker the colour, the less the pixels need to be lit up. Black requires the pixels to be turned off, making the screen very energy efficient. It also means the screen has amazing contrast of colours. The size of the pixels and their arrangement is so condensed that they actually make for a resolution of 1080p full HD, with 441 pixels per inch (PPI). The special arrangement and size of the pixels is what makes the screen so sharp.