Retina Displays, 4K, and True Tone are among the screen resolutions available in the tablet market. But which ones are worth the cost and which are just marketing buzzwords?

Is spending the money on a 4K tablet really worth it? And how does it stack up to the Retina Display and True Tone? We'll explain.

Overall Findings

There's an important difference between a tablet and a television. A television is used primarily to watch video. To get the most out of the videos you watch, your television's resolution should match the resolution of the video.

So, even though televisions come in different sizes, the industry needs a standard screen resolution to match the video produced with the resolution of the television. 

It doesn't do any good to have a higher resolution for a bigger television when the picture on the screen is shown at a lower standardized resolution.

While 4K is an important standard for the television industry, tablets are used for much more than streaming videos from Netflix and Amazon Prime.

So, in terms of a tablet, the 4K designation has less meaning. Does that make Retina or True Tone (or both) a better option?

Retina Display Pros and Cons

• Comes with many different screen resolutions.

• Beautiful visuals.

• No extra viewing benefits beyond a certain point.

• Uses more graphics power and deplete the battery faster.

A Retina Display is a screen with a pixel density high enough that individual pixels can no longer be discerned by the human eye when the device is held at a normal viewing distance, according to Apple.

The normal viewing distance is an important part of this equation, because the closer you hold the device, the smaller the individual pixels need to be before they become indistinguishable from one another.

Apple considers the normal viewing distance of a smartphone to be between 10 and 12 inches, and the normal viewing distance for a tablet is around 15 inches.

The Retina Display distinction is important because any higher screen resolution doesn't provide extra viewing benefits. Once the human eye can no longer distinguish individual pixels, the display is as clear as it can be.

And, higher screen resolutions require more graphics power, which depletes the battery faster. So exceeding a Retina Display can actually detract from the device.

The confusing part about a Retina Display is that it comes with many different screen resolutions. A 4K display is generally a 3840 x 2160 resolution regardless of its size, but a Retina Display's resolution usually changes based on its size.

The 9.7-inch iPad Pro has a 9.7-inch display measured diagonally with a 2048 x 1536 resolution. This gives it a PPI of 264, which Apple considers enough to be a Retina Display for a tablet. The 12.9-inch iPad Pro has a resolution of 2732 x 2048, which also gives it 264 pixels per inch (PPI).  

A PPI of around 250 or above is key to achieving that Retina display range in tablets. The iPad Mini 4 has a PPI of 326 because it has the same screen resolution as an iPad Air 2 with a smaller 7.9-inch screen.

Apple thought that keeping the resolution the same from a compatibility standpoint was more important than the extra drain on the battery, but the display itself would look about the same with a smaller resolution.

4K Pros and Cons

• Sharper videos.

• 3840 x 2160 or 2160p resolution.

• More pixels per inch (PPI) than HD.

• Only benefits streaming video.

• Best on tablets that measure 12 inches diagonally or more.

• A limited selection of movies and TV in 4K.

• Streaming 4K video requires more bandwidth.

In terms of buying a tablet, the 4K designation should only be a concern if you primarily use the device to watch television and stream video.

The real number to look for is the display's pixels per inch (PPI). PPI is based on screen size and screen resolution. Most tablets now display it in their specifications. 

A 4K resolution on a tablet should generally be considered only on tablets that measure 12 inches diagonally or more. Smaller tablets with a 4K resolution are jumping on the bandwagon for a display that uses more battery power but doesn't provide any clearer resolution than an iPad.

When Samsung released the 4K Galaxy Tab S3 tablet, it sported a decidedly non-4K resolution of 2048 x 1536. This is the same resolution as the 9.7-inch iPad Pro.

Samsung marketed this Galaxy Tab S3 as a 4K tablet because it can accept 4K video, even though it cannot output it onto its display. This labeling basically takes marketing buzz words into the bait-and-switch area. It also means you should be skeptical of any tablet referring to itself as 4K.

While 3D TVs have proved to be a bit of a fad, 4K television sets are likely here to stay, but it may take longer than some think for 4K TVs to become the true standard. It takes more space to store a 4K video and, more importantly, it takes more bandwidth to stream 4K. 

It takes around 5-6 Megabytes-per-second (Mbps) to stream 1080p high definition video. If you take into account the need to buffer and deal with the varying speeds of Wi-Fi, 8Mbps would be more ideal.

And while 4K video streaming requires between 12 Mbps and 15 Mbps, the ideal connection is around 25Mbps. 

Most internet providers offer a baseline of 200Mbps to 300Mbps, which makes 4K streaming even easier and more reliable as more streamers expand their 4K content offerings.

On the other hand, those with slower connections could feel a major slowdown if two people on their network tried to watch a 4K movie at the same time.

While 4K televisions aren't yet standard in every household, they have reached a higher level acceptance at the consumer level. In a few years, many may think the extra$100 spent to upgrade to a 4K screen is worth it.

True Tone Pros and Cons

• Capable of producing DCI-P3 Wide Color Gamut.

• Detects ambient light and mimic real-world light.

• Can be turned on and off.

• Uses a tiny amount of battery.

The Apple iPad Pro line has what it's calling a True Tone display. The True Tone display is capable of producing DCI-P3 Wide Color Gamut, which is a standard used by the music industry.

The move toward Ultra-High Definition (UHD) in the TV industry is in the direction of a wider color gamut as opposed to just increasing screen resolution.

Another feature of the Apple True Tone display is the ability to detect ambient light and alter the shade of white shown on the screen to mimic the effect of light in the real world.

This dynamic is similar to how a sheet of paper might look more white under shade and more yellow directly under the sun.

Which Should You Choose?

If you're an avid film and television buff who primarily uses a tablet for streaming video, you might want to invest in 4K.

It provides zero benefits to other forms of media like e-books, though, and the 4K video game selection on mobile platforms is limited.

If you use your tablet more as a multi-purpose device, you might want a Retina display instead. As for True Tone, it's a welcome addition, but hardly necessary.