All about smartphone screen resolution

The smartphone’s display serves as a crucial component for both inputting and outputting information. The comfort of operating the device relies heavily on the quality of the displayed image. Manufacturers offer a wide range of screens with different characteristics for modern smartphones, which are chosen based on the device’s market position and price. One important aspect to consider when selecting a display is its resolution. However, not everyone is familiar with the concepts of screen resolution and pixel density.

Relationship between screen size and resolution

Every mobile device has its own distinctive features. When consumers are choosing a gadget, they typically prioritize factors such as size and performance. Most smartphones available on the market have a display size ranging from 4 to 5.5 inches, while phablets and tablets can vary from 5.6 to 7 inches. Budget devices usually have a display size smaller than 4 inches. However, many potential buyers often make the mistake of focusing solely on the diagonal measurement of the device. While this parameter is certainly important, it is also crucial to carefully examine the "resolution" characteristic, as it directly influences display quality.

Screen resolution refers to the maximum number of pixels (points) that the display can reflect vertically and horizontally. It is represented in the device specifications as a binary matrix indicating the number of pixels vertically and horizontally, such as 1280×720 px. This indicator determines the working area of the display, impacting both image quality and pixel density (dpi), which is another important parameter.

Android smartphones currently offer several popular screen resolutions that adhere to five density standards: 160, 240, 320, 480, and 640 dpi. On the other hand, iPhones (Apple’s mobile devices) have fixed display sizes and specific standards. For instance, models like the iPhone 5, iPhone 5s, iPhone 5c, and iPhone SE, which have a 4-inch screen, boast a resolution of 640×960 px and a high pixel density.

Table of screen parameters and recommendations

Here is a list of screen resolutions and other display parameters commonly found in today’s smartphones:

Below is a table outlining the different resolutions and densities, diagonal sizes, and price categories of smartphones:

When selecting a gadget with a sizable display (5 inches or larger) to ensure good image clarity, it is recommended to have a minimum matrix resolution of 720×1280 px and a density of 240 dpi. On a large-screen device with low pixel density, the picture may appear blurry and less sharp compared to a display with an optimal combination of interrelated characteristics. The use of a 4K display in smartphones is a subject of debate, as the difference with Full HD is almost imperceptible to the human eye at such sizes. Furthermore, very few smartphone applications currently support this level of picture quality. Therefore, purchasing a smartphone with a high screen resolution is often more of a fashion statement than a practical advantage.

An important note is that the human eye, under ideal conditions, can distinguish points with a density of up to 350 dpi at 100% vision. However, for a comfortable perception, a density of 250 dpi is usually sufficient.

Additionally, it’s important to consider that a smartphone with a high pixel density and resolution may drain the battery faster. Therefore, it is advisable to select a device with an optimal screen resolution that matches its performance level, screen size, and battery capacity. The preferred smartphone screen resolution ultimately depends on the individual preferences of the buyer.

How to find out the screen resolution of your phone and change it

1. Locate the System folder in the file manager.
2. Within the folder, you will come across the build.prop file. Open it using a text editor.
3. Inside the file, you will find the ro.sf.lcd_density line that specifies the pixel density parameter. Modifying it is possible, but it should be done cautiously, making increments no greater than 10. Drastic changes in dpi might result in system errors.
4. Once you have made the desired modifications, save the changes and proceed to restart your smartphone.

Modifying the screen resolution on your smartphone can be made easier with the second method. This method does not require root access. To accomplish this, simply download the SecondScreen app from the PlayMarket. This app is specifically designed for use with Android smartphones on external displays. With SecondScreen, not only can you easily adjust the pixel density and resolution, but you can also connect an external keyboard, prevent screen rotation, and even disable the backlight to conserve battery life.

Pro tip! Before making any changes, it’s important to verify that the default settings do not match the installed extensions in the required applications.

To check the smartphone’s screen resolution, you can usually do so in the "Settings" menu under the section that displays the phone model’s specifications.

If you don’t have that choice available, you have the option to capture a screenshot of the image, then save and examine the properties of the saved file in the designated information section.

Concluding our discussion, it is important to recognize that the optimal screen resolution is the one that completely meets the needs and expectations of the device’s owner.