What is the diagonal of a smartphone and how to find out the screen size in inches and centimeters

How to measure phone screen dimensions: ruler in centimeters

So the question is, how do you measure your phone screen size?”
arises for those who want to purchase a new smartphone or simply measure the screen of their phone, but usually the size is indicated in inches and not every buyer understands how much it is. Therefore, now we will figure out how to correctly measure the screen size in centimeters. There is also another problem related to the fact that not everyone knows how to convert inches that are written on boxes or on the Internet into centimeters. We will also look into this and answer all frequently asked questions. There are several ways to find out the phone screen size.

First way

: take a regular ruler, measure the phone screen with a cross, namely, draw a diagonal from one corner to the opposite corner and measure it. Then you will see the size directly in centimeters.

Second option

: This is to find information on the Internet about what size the phone is in inches. One inch is 2.54 cm. To find out the size in centimeters, you need to multiply the indicated number of inches by 2.54 cm, which will show how many centimeters your phone screen is. If, on the contrary, you want to convert from centimeters to inches, then you need to divide the number of centimeters by 2.54 cm. And then you will find out the number of inches.

Third way

: to find out the phone screen size, you need to find the phone box and look at the information there. Usually the information says the size in inches, so to be guided by centimeters, you can convert it to them. Namely, multiply the number of inches by 2.54 cm, then you will get the screen size in centimeters.

Fourth method

created for those who do not have a ruler at hand or cannot find information about the phone, you can measure the screen with matches. If you take all the matches, they will be the same size, namely, each of them will be equal to two inches. When you find the number of inches on the screen and do the same thing, namely, either convert it to cm if you need it, or leave it in inches for your convenience.

How to find out the diagonal of a tablet

Hello dear site visitor! If you suddenly have a question about how to measure the diagonal of a tablet, then here you are, in this simple and accessible instruction, you will learn how to find out the diagonal of a tablet.

There are two ways to find out the diagonal of the tablet; the first way is to measure the diagonal of the tablet with a special inch ruler. The second way to find out the diagonal of the tablet is using a special program system info droid. Now let's look at each method separately. The first method is to take a special inch ruler and place this ruler diagonally on your tablet and see how many inches your tablet is. The inch line can be purchased in stores that sell school supplies, notebooks, drawing instruments, and albums.

This is how the inch ruler looks like, on one side you can see centimeters, and on the other side you can see inch sizes of 1 inch, 2 inches, 3 inches and so on up to twelve inches.

Second way. You can also find out the diagonal of the tablet using a special program system info droid, this program can be downloaded from the play market application. If you have not yet installed the system info droid program or you do not know how to install this application, then you can read the instructions on how to download and install the system info droid program on your tablet. After you install the system info droid program on your tablet, you will need to run the system info droid program on your tablet.

After you launch this software, you will need to click on the “DISPLAY” item once, after which a section will open in which you will see a special Screen Size line, in which you will see the diagonal size of your tablet in inches and centimeters. In these simple ways you can find out the diagonal of your tablet or phone.

That's all for me, good luck everyone! See you again at computerhom.ru.

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Ruler application for phone

Google Play has many applications of various lines for your smartphones. You can use this method

To find out the size of your phone's screen, you don't need to complicate this process; you can simply find information on the Internet, or on the box, or measure the screen yourself using a ruler or matches. Therefore, this can be done using improvised means, without coming up with anything complicated. Even a child can cope with this task, so use the tips on how to measure the size of your smartphone screen.

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How to measure the diagonal of a tablet with a ruler

The dimensions of devices are checked in two ways:

In the first case, the ruler is placed to the diagonal of the device. It is important that it is pressed tightly against the screen. Such a ruler can be purchased at a regular office supply store.

The program must be downloaded from Google Play or Apple Store. Otherwise, the utility will introduce a virus onto the tablet. After installation, click on Display, and then on Screen Size.

What is the diagonal of a smartphone

The phone screen diagonal is the distance from the bottom left corner to the top right corner. It's quite easy to measure. And anyone with a ruler can do it. The diagonal is indicated in inches. This is because the first devices with screens – televisions – appeared in the USA. And there the so-called “imperial” system of measures was adopted. It is also called English.

How to find out the diagonal of a smartphone in centimeters

To convert inches to centimeters, multiply the diagonal value by 2.54. 1 inch = 2.54 cm or centimeters. For example. If the screen diagonal is 6.2', then in centimeters it will be 6.2 * 2.54 = 15.75 cm.

What is the difference between screen resolution and diagonal

Read more about screen resolution here. In short, the resolution of a smartphone is the number of pixels along the X-axis and Y-axis. For example, 720x1280 pixels.

As you can see, the diagonal tells us about the size of the screen itself. While resolution is how many pixels are on the screen. The more there are, the clearer and more detailed the picture will be. The smaller, the more “grainy” the screen will be.

That is why in the characteristics of smartphones there is still such a thing as pixel density. This is the number of pixels that fit in one inch of a device's screen.

It turns out that the larger the screen diagonal, the higher the resolution should be. This is when the pixel density will be acceptable. For example, a smartphone screen with a diagonal of 5.5 inches and a resolution of 720*1280 pixels will be better in quality than a 6.2-inch screen with the same resolution. This is because in the first case there will be more pixels for every inch of the screen.

What are the diagonals of smartphone screens?

According to Deviceatlas.com, in the first half of 2022, the most popular smartphone diagonals in the hands of users around the world were still 5.5 and 4.7 inches. And this despite the fact that in 2019, a rare manufacturer released models smaller than 5.8 inches onto the market. It seems that in 2022, the first place will be taken by phones with screens from 5.8'.

The maximum smartphone screen size can be considered 6.7 inches. Phones with such screens are also called phablets. Anything larger is already a tablet.

What is the viewing area (viewport) of a smartphone screen

The term “viewport” was coined so that website and application creators could create highly readable and distinguishable elements on any smartphone.

In fact, this is a trick that allows smartphone manufacturers to write beautiful resolution numbers, such as Full HD (1280x1920 pixels), etc. But in fact, in a browser or application in real life, much lower values ​​are used - 414x736. Do you feel the difference?

The viewport makes websites appear differently on mobile devices than they do on a desktop screen. Users don't have to zoom in to see small text and buttons. Thus, the viewing area of ​​a smartphone screen means a resolution at which it will be convenient to view websites or application interfaces.

An example of the relationship between viewing area, resolution and diagonal of iPhone screens:

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Viewing methods

To view the characteristics of a smartphone, we need to have access to the Internet, a working official application store from Google called Google Play, or at least a browser. Alas, the characteristics of the smartphone are not written anywhere in the system itself, since the developers hide them from the Settings application.

Some parameters can be found out by reading them on the box. But, as a rule, very little information is indicated there.

There are a lot of ways to find out all the characteristics of a phone, but they are all essentially divided into two:

For the first case, we need to know the phone model, and for the second, download the utility. Both of these options are quite good and suitable depending on the situation. Read more about them below.

The first way is through a search engine

In order to view the characteristics of a phone through a search engine, you need to find out the make and model. Fortunately, these two characteristics are present in the smartphone settings. To do this, follow these steps:

The search results will appear in front of you. You can open any convenient website and view the complete data. For more detailed information, you can go to the model discussion thread on the popular 4pda forum. To do this, simply write the smartphone model with the prefix “4pda discussion”.

The second way is through the AIDA64 application

AIDA64 is the most popular application on Google Play, which allows you to monitor the full characteristics of the gadget in real time.

You can download it completely free of charge. But this version will have some advertising. If you wish, you can buy the full version of the program for a little more than $1 (the price varies depending on the dollar exchange rate and the country). The full version of AIDA64 only removes ads, it does not open up any new features.

After installing the application, open it. Inside we will find a convenient menu with various data.

The main screen looks like the screenshot below and it contains:

To obtain specific characteristics, you need to go to the desired section and all the available information will already be there.

As you can see in the screenshot above, there are quite a lot of sections and they allow you to get maximum data about the device. You won't find so much information on any website. There is even such unique information as the heating of the device (processor, battery, etc.). It will also be quite useful to learn about the smartphone’s codecs and look at the characteristics of applications, both built-in and installed during operation.

To view the model, brand, memory and information about sensors, open the “System” window.

The “CPU” window shows all the data related to the central system of the smartphone: the processor, its architecture, frequency, number of cores, the strength of each core at the moment, and so on.

Let's look at each item separately in the following table:

In general, by examining each window, you can put together a complete picture about the gadget, having learned almost all possible information about it.

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Calculation of all screen sizes - calculators and tables

There are two calculators on the page: 1. Conversion from inches to centimeters and vice versa 2. For online calculation of the width (aka length) and height of the screen of any device. To calculate these dimensions, you will need the diagonal and aspect ratio.

Two tables: 1. Display sizes of smartphones and tablets 2. Display sizes of TVs, monitors and laptops

The dimensional characteristics of the display consist of 2 aspects: diagonal and aspect ratio. Often, the diagonal size is indicated in inches, which is not convenient. And the format of a TV, monitor, laptop or smartphone has aspect ratios, for example 16:9 is the most common. Although smartphones are now more often made in 18:9, which makes them look more elongated.

Calculator for converting from inches to centimeters and vice versa

Calculator for calculating screen width and height

The tables are divided by device. Smartphones and tablets are in the first table, and monitors, laptops and TVs are in the second table. Sizes overlap. For example, 19 inches is typical for both a laptop and a monitor, but it won’t be difficult to navigate. If you need diagonals in centimeters, they are in the second column. It may not exactly match what you requested, since the translation does not produce integers.

Table of diagonals, heights, lengths for tablets and smartphones

Help on aspect ratios in mobile technology. There are a lot of different ones, but the standard tends to 16:9, with 18:9 gaining popularity.

What sizes can Android and iPad tablets have?

Tablet PC models are varied. Their dimensions are measured in centimeters and inches. The last option is more common. Gadgets come in the following sizes:

Devices are measured in centimeters as follows:

Important! Different countries have their own units of measurement. This must be taken into account when purchasing a gadget from abroad. Only Russian standards are described above.

Table of screen sizes for smartphones and tablets

Dimensions in inches, which are converted to centimeters and based on these data the height and width are calculated. Attention! The height and width are affected by the ratio; here the now popular 18:9 ratio is used for calculation. If yours is different, use a calculator.

Table of diagonals, heights, lengths for TVs, monitors and laptops

Help on screen formats for desktop devices and laptops. At the beginning of the table are laptops, they are often with a diagonal of 10 to 17 inches, although there are also 21 inches. Monitors, especially old ones, can start from 15 inches.

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How are smartphone screens different? Everything you need to know about types, resolutions and frequencies

When it comes to smartphone screens, there are many parameters that describe them. But understanding so many abbreviations and numbers is not so easy. This article will help you navigate when choosing a smartphone if its screen parameters are really important to you. Full HD or 2K, LCD or AMOLED? What is 300 ppi and 2160p? You will find answers to these and other questions below.

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If you know the size of your display, you can determine how many pixels fit into one square inch: this is pixel density (ppi). If you wish, you can easily calculate the ppi of your phone using a calculator.

So, the main screen resolutions of modern smartphones are:

HD means high definition or high resolution. If we talk about the number of pixels, an HD screen contains 1280 x 720 pixels regardless of its size.

Naturally, the smaller the screen, the higher the pixel density and, theoretically, the better the image. Therefore, the mere presence of an HD display does not matter much, since the picture quality on a 5-inch screen will be different from that on a 10-inch one.

For example, a 4.3-inch screen has a pixel density of 342 ppi. On the 4.7-inch screen, the pixel density will drop to 312 ppi, but both will remain HD displays. According to Apple, 300 dpi is the sweet spot because it's about the point at which the human eye stops distinguishing individual pixels at a certain viewing distance (and on a certain screen size).

Full HD

Full HD resolution was the next step in the evolution of smartphone displays and is now the standard, although 2K (QHD) has been gaining popularity on high-end devices since the Oppo Find 7 and LG G3, the first commercially available devices with QHD screens.

QHD, Quad HD or 2K

QHD stands for Quad HD, which is four times the resolution of standard HD, or 2560 x 1440 pixels. The 5.5-inch QHD display has a density of 538 ppi.

Many phones from Samsung, Motorola, Huawei and other well-known brands now come with 2K displays as standard.

4K or Ultra HD

Sony calls this display 4K, although its actual resolution is actually slightly lower. However, the Z5 Premium has a pixel density of 806 ppi - which is much higher than many smartphones offer, and even beyond what users consider necessary.

Trends

While smartphone screens continue to get bigger, devices with 4K displays aren't as common. That's why Sony continues to lead the way in this area with the Xperia Z5 Premium and XZ Premium.

As a result, 2K screens have become the norm for phones. It's likely that this has a lot to do with the issue of device battery life, since large, high-resolution displays consume much more power. Since battery life has become a sore point for many smartphones, manufacturers seem reluctant to move towards 4K.

Panel types

Smartphones use different types of displays: LCD, OLED, AMOLED, Super AMOLED, TFT, IPS and the rarer TFT-LCD. Recently, IPS-LCD panels are one of the most common. But what do all these abbreviations mean?

LCD or Liquid Crystal Display means a liquid crystal display whose matrix is ​​created using backlit liquid crystals. The relatively low cost of such displays makes them popular with manufacturers of phones and other equipment.

The main advantage of TFT is its relatively low cost and increased contrast compared to traditional LCD displays. The disadvantages of TFT LCD are higher power consumption than other types of LCD screens, less impressive viewing angles and not very accurate color reproduction. It is for these reasons that TFT displays are being used less and less in smartphones.

IPS stands for In-Plane Switching and it is an improved version of TFT LCD. This display provides better color reproduction and, most importantly, a wider viewing angle. This is achieved by using two transistors for each pixel in combination with a more powerful backlight. The disadvantage is high power consumption. But, as a rule, IPS screens still consume less energy than TFT ones.

There are other types of abbreviations that can be found in combination with IPS, for example, IPS-NEO. In this case, this is the proprietary name of the technology created by JDI, but it works the same as in any other IPS-LCD display.

AMOLED

This means that OLED displays have much purer blacks and consume less power when blacks or darker shades are displayed on the screen. However, lighter themes on AMOLED screens consume significantly more power than LCD displays. OLED screens are also more expensive to produce.

On the other hand, AMOLED technology makes screens thinner than LCD (since they don't require a backlit layer) and also makes them flexible.

What is the difference between OLED, AMOLED and Super AMOLED?

OLED stands for Organic Light Emitting Diode. An OLED display is made up of thin sheets of electroluminescent material, the main advantage of which is that it produces its own light and therefore does not require a backlight, reducing power consumption. As mentioned above, AM in AMOLED stands for Active Matrix, which is different from passive OLED, which is less common in smartphone screens.

Retina

Given that 5.5-inch QHD screens are already common in top-of-the-line Android smartphones, with some devices boasting 534 ppi, Apple eventually had to capitulate to the theory that 300 ppi was plenty. As a result, the latest iPhone models, XS and XS Max, have displays with a density of 458 ppi.

Refresh rate: what do 60, 90 and 120 Hz mean?

The disadvantage of 90 Hz screens (and 120 Hz, among others) is that the battery life of the device is significantly reduced.

Screens of the future

Micro-LED

Micro-LEDs do not require backlighting and do not require a polarizing filter. The layer of glass above the panel can be made even thinner. Micro-LED brightness levels per watt are higher than OLED panels and significantly superior to LCDs. At the same brightness, a micro-LED display consumes half the energy of an OLED screen. Extremely small diodes also allow for higher resolutions - for example, a smartwatch with a 4K screen resolution would be entirely possible using micro-LED technology. Last but not least, micro-LED screens are not as prone to pixel burn-in as OLED displays.

The main disadvantage of this technology at the moment is its cost. The production of micro-LEDs is quite complex, there are very few production lines for this, and the defect rate is still high. All this increases costs. However, many of these problems can be solved by mass production when it can become so.

Which screen is better?

As you can see, the difference in manufacturers has also given rise to a difference in terminology, although recently these lines have been blurred. AMOLED screens aren't always exclusive to Samsung anymore, and Retina isn't always reserved for Apple. LCD displays for the iPhone are currently made by LG, while Samsung makes screens for the iPad.

In general, when comparing screens, it is necessary to take into account not only the numbers and manufacturing technologies that we discussed above. When choosing a smartphone with the best screen, you need to see it in real life to understand whether its color rendering is too cold or warm, whether you like its saturation, brightness or contrast, what its viewing angles are, and so on.

If you're under pressure to conserve battery power or are simply obsessed with eye-popping colors and contrasts, take a look at AMOLED displays. In a word, the choice is yours.

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Method 1: from technical specifications

First of all, you will need to find out the device model. On a TV or monitor, this information can be found on the nameplate, which is usually located on the back. In the case of laptops, you need to turn the device over and look at the sticker on the bottom. Information about the phone or tablet model can be found in the settings, section “About the device”.

Next, use a search engine to find the technical specifications of the device on the Internet. Here the desired diagonal value will be indicated.

Screen aspect ratio

Aspect ratio shows the ratio of the horizontal and vertical sides of the screen to each other. For example, a 1:1 format is a square image. Typically, specific resolutions have specific aspect ratios.

Which ratio is better depends directly on the format of the film or game. There are usually no problems with games, since they easily adapt to different formats, but when watching a movie of the wrong resolution, black lines may appear at the edges of the screen.

The most popular aspect ratios for which most multimedia content is adapted are 16:10 and 16:9.

Method 2: measure the diagonal

The second way is to measure the diagonal using a ruler or tape measure. Measure the distance from the upper left to the lower right corner of the device, and it is the screen that needs to be measured; the body is not taken into account when calculating the diagonal.

To avoid accidentally scratching the display, we recommend measuring the distance using a thread, and then measuring the thread itself with a tape measure.

As a result, we will get the diagonal value in centimeters. All that remains is to convert it to inches. One inch equals 2.54 cm, so we need to divide the value obtained earlier by 2.54. The resulting result is rounded.

What resolution do most phones have?

In recent years, all flagship Android OS devices have had

Full HD (1080x1920) and QHD (1440x2560). In 2022, several devices with non-standard resolutions appeared on the market, mainly due to the new trend for edge-to-edge screens (the entire width of the device).

Interesting materials:

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How is screen diagonal measured?

Until recently, most mobile devices had a standard rectangular display with an aspect ratio of 16:9, and this was the most convenient time to measure diagonals. In fact, the measurements were as simple as possible: you just had to apply a ruler from the upper left edge of the display to the lower right edge, or vice versa - the upper right and lower left edges allowed you to get exactly the same result. If information is printed on the ruler in inches, then it is possible to immediately obtain the result and correlate it with what the manufacturer indicates in the official technical specifications. Why might this be needed? In fact, even well-known manufacturers can round the diagonal up to get beautiful numbers, while little-known brands are even able to inflate the result by several tenths of an inch. I would like to hope that this is a thing of the past.

If the ruler only has values ​​in centimeters, this is also not a problem. Considering that there are 2.54 centimeters in 1 inch, it is enough to divide the result obtained by 2.54. The result is the diagonal in inches.

A more complex way to measure the diagonal is to use the Pythagorean theorem. This is possible if the length and width of the screen are known. They can be measured using a ruler or obtained similar information from some applications, for example, through AIDA64 (sometimes the data may not be specified or specified accurately: rounded up or, less likely, down).

So, let's use the same formula for measuring the diagonal of a rectangle: c² = a² + b² , where “a” and “b” are the sides of the rectangle (in our case, a rectangular screen), and “c” is the diagonal.

For example, let's take the old ASUS ZC520KL. Using a ruler and applications, it was determined that its sides are 6.5 and 11.5 cm. We substitute these values ​​into the formula, obtaining c² = 6.5² + 11.5².

When calculating squares, that is, when multiplying numbers by themselves, we get c² = 42.25 + 132.25, and after addition the result will be: c² = 174.5.

Now we need to extract the square root of both sides of the equation, as a result of which the formula takes the following form: √c² = √174.5. After counting and rounding, we get c = 13.21 cm, or, converting centimeters into inches (13.21 divided by 2.54), we find out that the screen diagonal is 5.2″, which corresponds to the data specified by the manufacturer of the ASUS ZC520KL smartphone.

But the problem is that smartphone models with a perfect rectangular screen, although they are still being produced, are becoming increasingly rare every year. Most often on sale you can see displays with rounded corners, which reduce the actual or, as it can also be called, visible diagonal, and make part of the information on the screen inaccessible for viewing. In the technical characteristics of various devices, it is customary to indicate the full diagonal without taking into account rounded corners, but some manufacturers may explain in their advertising materials that the actual diagonal will be smaller. It all depends on how strongly the corners are rounded. It is not difficult to guess that the more curvature, the smaller the visible part of the screen.

As with a regular rectangular screen, you can measure the diagonal visible to the eye using a ruler. Only when calculating we need to take into account the area on which the picture is displayed, while the frames will no longer be of interest to us - regardless of what shape they have.

Smartphone display dimensions in inches, pixels, centimeters

16:9 or 16:10 is the display aspect ratio of the majority of smartphones. To describe screen characteristics such as diagonal, it is customary to use inches, and when it comes to sensitivity, pixels.

Smartphone screen sizes in inches

The growth of smartphone screen sizes is a seemingly continuous process. If in 2007 a diagonal of 3 inches was considered the norm, then in 2012 it grew to 4 inches. If a device has a screen smaller than 3”, then it is no longer considered a smartphone. Several years have passed and the 5″ mark has ceased to be the limit. And it seems that we should not expect a change in this trend. This is due to the growing popularity of phablets.

If anyone doesn’t know, a phablet is a hybrid whose components are a tablet and a smartphone. They are also called lampshades or tablet phones. Its distinguishing feature is its large display, larger than all average devices on the market.

As the diagonal increases, the terminology also changes. If in 2011 the Galaxy Note fit the definition of a phablet, today only devices whose screen has a diagonal of at least 5.5 inches are so called.

The clear line separating phablets and tablets has blurred. It all depends on the manufacturers. According to Samsung's classification, even the Galaxy W, which has a 7-inch screen, is a phone. And Huawei believes that a device with a screen of the same size should be considered a mini-tablet, with a built-in module for cellular communications.

Smartphone screen sizes in centimeters

To get a complete picture of the physical dimensions of the matrix, it is possible to convert inches into more familiar centimeters, based on the fact that one inch is equal to 2.54 cm.

Pixels in a smartphone display

Pixels are not used to determine the physical size of a monitor. They display the size of the image located on it. When we talk about resolution, we mean the number of dots located both horizontally and vertically. This indicator, together with the diagonal, measured in inches, is used to calculate pixel density. A high value guarantees a clearer picture.

For a user holding the device no closer than 30 cm from the eyes, it is difficult to concentrate on individual points if the ppi exceeds 300. Back in 20110, such density was available only on Apple devices made using Retina technology. However, in today's realities, even Chinese phablets belonging to the middle class are equipped with FullHD screens (1920 by 1080 pixels).

Five-inch smartphones may well have HD resolution (1280 by 720 pixels). Some manufacturers install displays with a resolution of 2K (2560 by 1440) and 4K (3840 by 2160) on their smartphones. However, the benefits of such innovations can only be seen when familiarizing yourself with VR content.

What screen diagonals do smartphones have?

Modern technologies allow manufacturers to create devices with fairly thin frames, the thickness of which will likely become even smaller over time. How convenient this is for a real user is a separate question, but the fact is that screen diagonals are steadily growing. The popular statement that anything larger than 7 inches is already a tablet is losing its relevance, since smartphones with the same diagonal always turn out to be more compact than tablets, including due to narrow frames and screens with an aspect ratio of 18:9, 19: 9, etc., but we’ll look at the effect of aspect ratio on the dimensions of the device a little later.

According to statistics on the diagonals and sizes of smartphones from the DNS store, the smartphone with the largest screen was the Honor 8X Max, which received a display with a diagonal of 7.12 inches. However, in reality the device turns out to be much smaller than tablets.

The new product, called Tecno Pouvoir 4, shows that a seven-inch smartphone can not only be relatively compact, but also budget-friendly, not exceeding the cost of 10,000 rubles.

But compact smartphones these days will be very difficult to find. Among the few exceptions, the Apple iPhone SE 2022 stands out, which remained aloof from fashion trends, having received a small screen with a diagonal of 4.7″. It also has a classic aspect ratio - 16:9. There is only one disappointment: due to the large frames, the usable screen area is at a fairly low level.

what is it, how to find out the display size, optimal values ​​for smartphones

When studying the parameters of a smartphone in the Yandex.Market service or on the website 4pda.ru, in the “Screen” section the user sees the line “Resolution” and 2 multiplied numbers. This article will tell you what screen resolution is on a smartphone, why it is needed, what it is on different devices, and whether this parameter can be changed.

What is screen resolution and why is it needed?

This value shows how many pixels can fit on the screen.

The higher the value, the better the image will be displayed - there will be no graininess (as on push-button phones), the letters will be neat, without “jags,” and more elements will fit in the workspace. Therefore, it is recommended to buy devices with a resolution of at least 1280x720.

Screen resolution of popular devices

Depending on the manufacturer, it may vary. Companies producing smartphones with Android OS use standard values:

Apple smartphones have their own standards for permissions.

For Apple devices

Apple devices have their own standards for permissions

For Android devices

Permission standards for Android devices

How to find out the screen resolution on your phone

There are 3 ways:

Is it possible to change the resolution

You can't change the resolution like you can on a computer, but you can change the pixel density per square inch (ppi).

The procedure will require: root rights, the Root Explorer file manager and a text editor. The procedure is as follows:

To summarize, resolution is an important display characteristic. The comfort of using the device, the quality of the played video and graphics in games depend on it.

What is usable screen area?

Usable screen area is the ratio of the display area to the total area of ​​the front side of the smartphone. There is even a separate English term for this, screen-to-body, which can often be found in the news about new smartphone models.

To better understand the issue, let’s again take the ASUS ZC520KL, whose case sides are 15.05 and 7.33 cm. To calculate the area of ​​the case, we multiply the indicators, resulting in 110.3165 cm². We carry out the same operation to determine the display area: 6.5 cm × 11.5 cm = 74.75 cm². Having the area of ​​the smartphone body (and therefore the front panel) and the display area, you can calculate the usable screen area using the following formula: 74.75 (display area) : 110.3165 (front area) × 100 = 67.76. Thus, the usable screen area of ​​the ASUS ZC520KL smartphone is 67.76%, which is small by modern standards. This is due to the wide bezels around the screen.

It is also necessary to take into account that when indicating the usable area, manufacturers often resort to tricks, measuring only the front panel, which is highlighted in orange in the picture below, while parts of the side faces (indicated in blue in the image), which also occupy the area on the front side of the smartphone, are not taken into account. One can argue for a long time whether this is the right approach, but for the average user it is almost impossible to accurately measure the area of ​​the front panel alone.

With the advent of displays that extend onto the side edges of smartphone cases, including so-called waterfall screens with a curve of about 90 degrees or more, the usable area of ​​the screens is sometimes not only almost 100%, but even exceeds this figure.

For example, in Xiaomi Mi Mix Alpha, which was never put into mass production, the figure was a fantastic 180%, but this begs the question of how you can get more than 100%? In fact, it is customary for manufacturers to measure the area of ​​the entire screen, and even those parts of it that extend beyond the front side of the device. Given this, it is not surprising that the display area will exceed the area of ​​​​the front side and go beyond the 100% mark.

What is PPI

Most owners of electronic devices know that the screen consists of many squares that can change color - pixels. As long as we are not trying to depict on the screen anything more complex than a “black square”, there are no problems. But as soon as diagonal lines appear, jagged edges become noticeable on the screen.

Obviously, the smaller the pixels, the less noticeable they are. However, as the pixel size decreases, the number of pixels will inevitably increase (we don’t want the screen to get smaller too). The number of pixels is indicated by a parameter such as screen resolution. For example, a resolution of 2400x1080 means that the screen fits 2400 pixels horizontally and 1080 pixels vertically. Is it a lot or a little?

To answer this question, resolution alone is not enough, because the size of the screen is unknown. But if you divide the number of pixels horizontally by the width of the screen (or vertically by height), you get PPI - the number of pixels per inch of length (in English PPI stands for “Pixel Per Inch”, translated into Russian - “ Pixels Per Inch"). So, 200 PPI means that there are 200 pixels per inch of screen.

What is aspect ratio and how does it affect the size of smartphones?

In simple terms, the screen aspect ratio, which in English literature is referred to as aspect ratio, refers to the ratio of screen sizes - width and height. In practice, if we take a screen with approximate dimensions of 6.5 and 11.5 cm, then dividing the larger number by the smaller one, we get a result of 1.7. The exact same number will come out if 16 is divided by 9. All this indicates that the screen aspect ratio is the classic 16:9, but it will be easier to focus on the screen resolution, which is necessarily indicated in all technical specifications. For example, if the screen resolution is 1280 × 720 pixels, then with a similar division of the numbers (1280: 720) we again get an indicator of 1.7, indicating an aspect ratio of 16:9.

But this ratio is gradually becoming a thing of the past. It is being replaced by 18:9 (2:1), 18.5:9, 19:9, 19.5:9, 20:9 and so on. Everything will be limited only by the ideas of the creators of smartphones and screens for them. In other words, the screens are increasing in length, which, on the one hand, will make them in some cases more convenient to use, but, on the other hand, with a similar diagonal, the screen area will be larger in the version with an aspect ratio of 16:9.

Therefore, it is not surprising that even models with the same frame sizes and the same diagonal will have different body sizes. Options with sides 18:9, 18.5:9, 19:9 and so on will be more compact than devices with a 16:9 aspect ratio. The price for compactness will be the loss of a few tenths of an inch of the display (when converted to a 16:9 ratio), but in reality few people notice this shortage, even taking into account the fact that the area will be further reduced due to the rounded corners.

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Aspect ratio from inches to centimeters

The 7″ diagonal of a tablet is almost ideal if you make the right choice. Such a device fits in a clutch or in a men's handbag, and even in a jacket pocket if a person wears business clothes.

A game

You can watch TV series - the tablet screen allows you to see everything you need.

The only drawback is that the screen size makes it difficult to work with texts. Horizontally, the keyboard will take up almost the entire screen, and a person will not see the lines. In a vertical position, it becomes inconvenient to operate the keys.