If you know the size of the display, you can work out how many pixels are squeezed into one square inch: that's the pixels per inch ppi figure, which is referred to as pixel density. You can easily calculate your phone's ppi using a pixel density calculator. We've got the major bases covered below, but will start with HD resolution or higher, since that's what most smartphones ship with nowadays.

You might also want to pay attention to the stated 'nits' too, which is a rating of brightness for displays. HD stands for high definition. HD simply means a pixel measurement of x pixels. No matter how large the screen is, as long as the pixel measurement remains at this measurement, it's an HD display.

As you can probably tell, the smaller the HD screen the higher the pixel density and, theoretically, the better the picture. So simply having an HD display doesn't mean much, as it will produce a very different image on a 5-inch screen than on a inch screen note: screen sizes are measured on the diagonal to take account of slightly different aspect ratios. According to Apple, ppi is the sweet spot, because that is roughly the point at which the human eye stops being able to discern individual pixels at a certain viewing distance and on a certain sized screen.

Full HD measures x pixels. Again, the pixel density will depend on how large the screen is overall. With smartphones at the 5-inch mark, the pixel density sits around ppi, while on a 5. The pixel measurement for QHD is x pixels. For comparison, the pixel density of a 5.

Definitions are also often referred to by the smaller number of the pixel measurement - HD will sometimes be called p, Full HD gets called p and so on. With QHD though, the 2K name comes from the fact that the bigger of the pixel measurements is over pixels, which can admittedly be a bit confusing and really ought to be referred to as 2.

Many phones from Samsung, Motorola, Huawei and other big name handset manufacturers include 2K displays as the standard nowadays.

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You can probably see where this is going. Like 2K, the 4K name comes from the larger of the two pixel measurements, which are, technically speaking, pixels in 4K and only pixels in Ultra HD. So while these two terms are often used interchangeably, they are actually a little bit different. Ultra HD is x pixels and 4K is x Both definitions frequently get shortened to p and the pixel difference is relatively marginal, but there is a difference.

Sony refers to this display as 4K, but it actually uses the smaller measurement of Ultra HD, not "real" 4K definition. Nevertheless, the Z5 Premium has a pixel density of ppi — far beyond what many smartphones offer, and beyond what many people would say is necessary. While smartphone screens keep getting bigger, there hasn't been a race to 4K from handset makers that we might have expected a year ago.

Instead, what has become the norm at the top of the market is a 2K panel, rather than a higher resolution option. This, among other reasons, probably has a lot to do with concerns about power, as larger, higher-resolution displays demand ever more.

With smartphone battery life already a sore topic for many, handset makers seem reluctant to make that leap just yet. However, could well be the year that we'll see more and more Ultra HD-equipped handsets going on sale, even through the mid-range. But what do these all mean? LCDs also tend to perform quite well in direct sunlight, as the entire display is illuminated from behind, but does suffer from potentially less accurate color representation than displays that don't require a backlight.

Active matrix means that each pixel is attached to a transistor and capacitor individually. The main advantage of TFT is its relatively low production cost and increased contrast when compared to traditional LCDs. It's for these reasons, and falling costs of alternative options, that TFTs are not commonly used in smartphones anymore.

It does this by using two transistors for each pixel combined with a more powerful backlight. The downside is that they require more power than other types of non-LCD display. They still generally use less power than a TFT display though. In that case, it's a proprietary name for a technology created by JDI that claims to eliminate backlight leakage, but it works in the same essential way as any other IPS-LCD display. While this may sound complicated it actually isn't. OLED is an organic material that, like the name implies, emits light when a current is passed through it.

This means that OLED displays have much purer blacks and consume less energy when black or darker colors are displayed on-screen. Color Gamuts. Color Accuracy. Intensity Scales. Display Reflectance. They are based on in-depth laboratory measurements with advanced scientific data analysis using proprietary diagnostic Test Patterns in our DisplayMate Multimedia Editions with proprietary instrumentation in our world-class DisplayMate Test Lab.

Raymond Soneira. They have been published in dozens of Consumer, Video, Computer, Professional Audio-Video, and Research publications worldwide, with an extensive readership that ranges between , and 1. Advanced Display Testing and Optimization for Display and Device Manufacturers DisplayMate Technologies specializes in advanced display Lab testing with our proprietary instrumentation and sophisticated scientific and mathematical display analysis for state-of-the-art strategic comparisons and display performance optimizations in our world-class DisplayMate Test Lab.

These public articles are a lite introductory analysis for general consumer audiences.

For Manufacturers we provide very technically advanced display testing, objective comparisons with competing products, and our expert analysis and recommendations for improving and optimizing prototype and production display performance on a confidential NDA basis for manufacturers for product engineering and marketing.

It's also significantly more expensive. Unless you're desperate to use 5G, stick with the regular version as it's basically exactly the same. Buy now from Mobiles. What we like about it: A fully featured smartphone costing much less than its competitors. W eirdly, OnePlus started with the 7 Pro and worked backwards to create a cheaper model, rather than working upwards to improve the 7.

The differences are minor, to say the least. A slightly smaller 6. Cameras are similar and the UltraShot algorithm is the same on both. It still charges quickly though. It is largely the same as the other two but considerably cheaper.

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No big loss. This is a bit cheaper and more old-fashioned. What we like about it: By far the best camera on a smartphone, capable of taking brilliant pictures with no effort. T he Pixel 3 is one of the best new phones on the market and a worthy competitor to Apple and Samsung's continued dominance of the market, though given the rise of the Pixel 3A which costs almost half the price, the shine has come off the 3 a little bit. Arguably the reason to choose a Pixel 3 over the cheaper 3A is the addition of a second inner camera.

This ensures selfies can be wider and taller, allowing you to capture much more in the selfie frame. The idea is that you won't need a selfie stick or really long arms to make sure you get all your friends, or the whole background in your shot. T here's also a neat wireless charging dock which will turn your Google Pixel 3 into a smart assistant like the simultaneously-announced Google Home Hub.

The charging happens very fast too. A 15 minute charge can give you up to seven hours battery life. The phones are very small and light in the hand, even the XL model doesn't feel unnecessarily cumbersome, although the back of the phone doesn't look quite as premium as the latest iPhone and Samsung Galaxy models.

It seems to me that Sony have basically given up trying to beat the rest with the best camera or the best battery both of which are perfectly good here, by the way, just not remarkable and decided to focus on the thing Sony does best: screens. T hink about it. Sony has a long and proud history of creating not just televisions, but the very movies that appear on them. And so here we have the Sony Xperia 5, a phone designed for watching. The screen itself is long and thin, 6. You can text without pausing your video, or scroll through Facebook while checking Google Maps.

Another nice, but slightly gimmicky feature is Dynamic Vibration. Watching James Bond leap from an exploding building? Of course, a professional movie camera would be much higher quality than the three megapixel cameras on this phone, but my movies came out nicely. Multi-window, Cinema Pro, and various others such as Game Enhancer are apps rather than baked into the software.

It feels like an afterthought rather than the idea which inspired the phone. Both are great phones, but the reason why I put this one so much further down is that it just feels way too big. The S Pen is very good, to be fair. You can use the pen to write on apps or send messages with gifs.



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Another handy feature is that the pen can also be used as a Bluetooth button, allowing you to take a selfie from a distance or with a selfie-stick, for example. The most useful feature is the ability to write memos without unlocking the screen by simply removing the pen from its holster and writing on the screen. H uawei has continued to show it produces some of the best camera technology of the bunch with its latest phone, the Mate 20 Pro.

Univisium, OLEDs and more

But that jump in power and quality comes at a price for the Chinese-made smartphone, which may put some off who are hoping for an alternative to Apple or Samsung. It comes with a bright full HD display at a massive 6. However, Huawei has packed its new phone full of features that may cause a few heads to turn. It also has a world first with a 7nm artificial intelligence powered processor, that helps it manage high-powered tasks and battery performance.