Currently, global manufacturers have begun to produce smartphones with IPS screen, which significantly exceeds the capabilities of conventional displays in its parameters. So, among the main characteristics of this element it is necessary to note:
- Excellent reproduction of the entire existing spectrum of colors. Now the consumer will be able to see an image that maximally conveys the smallest features of the object’s texture.
- The matrix is very resistant to physical or mechanical impacts. If conventional displays begin to distort the image when pressed, then these screens do not suffer from such distortions.
- The quality of the picture, which is unable to create vision problems, regardless of the time of constant use of the phone. This characteristic has been verified using special tests by highly qualified ophthalmologists.
- Quite wide viewing angles. Now the consumer has the opportunity to watch his favorite programs or play games even on public transport, without feeling the slightest inconvenience. The viewing angle is 178 degrees vertically and horizontally.
- The response takes a very short amount of time, despite the established stereotype about the low productivity of such devices. Choosing a smartphone with an IPS screen means purchasing a high-quality product that is ready to optimally fulfill any requirements of its immediate owner.
- The ability to watch videos and play games in maximum quality. Along with this display, phone models are often equipped with a high-frequency processor that can guarantee maximum performance of all device processes.
These excellent devices do not cost much at present. Thus, for a smartphone with an IPS screen, the price is consistently calculated for all average citizens of the state. Purchasing such a masterpiece of technology is also quite simple, since numerous stores already work directly with branches of manufacturers. The consumer needs to decide on the model he likes and the company that developed it, and then place an order via the Internet or personally visit the point of sale. These devices can radically change a person’s standard of living and give him the opportunity to relax, no matter where he is.
The smartphone may have powerful filling and take excellent pictures, but the user will still not be completely satisfied with it if the screen quality leaves much to be desired. Unfortunately, in terms of display characteristics, many buyers are complete laymen. Therefore, it is so important to consider what types of smartphone displays are available and what parameters you need to pay attention to when choosing a gadget.
Previously all displays touch phones classified into:
- Capacitive. The principle of operation is as follows: the user’s finger transmits the charge, and the device’s software calculates in which area of the screen the change occurred.
- Resistive. Behind the screen there are two metal plates. When the first one is pressed against the second one, the smartphone reacts. To smartphones with resistive screens styluses were often included.
Using resistive displays was inconvenient, as you had to apply force when pressing. Resistive displays finally disappeared from storefronts in 2011, and the last “swallow” was the model Samsung S5230 Star , once very popular among the fair sex.
Common Display Technologies
The following types of displays are available:
TFT
Screens made using this technology are mounted in budget gadgets. The image quality can be very decent, but some shortcomings will still be noticeable (for example, minimal viewing angles). The peculiarity of TFT displays is that they are not capable of producing perfect black - only dark gray.
IPS
Improved TFT technology, which guarantees high contrast, rich colors (in particular, black and white), large viewing angles. Lately, IPS phone displays have become increasingly common - even Chinese sellers are abandoning TFT technology.
AMOLED
Matrix consisting of organic light-emitting diodes. This technology not only provides brighter colors than IPS, but also allows the smartphone to work longer. offline mode, because the black color is formed by turning off some of the LEDs. AMOLED displays can usually be found on Samsung, which is not surprising, since it was the Korean company that developed them.
SuperAMOLED
Later she improved the design of AMOLED displays by removing the air gap between the screen and the touch layer. Due to this, image detail and color saturation have increased, and the display itself has become thinner. It’s interesting that people use screens Super AMOLED nicknamed “acid” because of their excessive brightness.
SuperLCD
Such screens are rare on smartphones - one of the gadgets with a similar display was the One X. SLCD technology provides warm and rich colors, but shrinks the smartphone faster than AMOLED and IPS.
What does screen resolution give?
Any screen consists of a huge number of “squares” - pixels that fit tightly together. Each pixel in turn consists of 3 subpixels (subpixels): red (R), green (G), blue (B). As food comes in, they mix in different proportions and produce some color. You can calculate the number of pixels on a device screen by multiplying two display resolution parameters: height and width. For example, HD display ( 1280 * 720 ) comprises 921600 pixels. That is, the higher the resolution, the clearer the picture will be. On gadgets with a minimum resolution, the “squares” will be visible to the naked eye.
There is another indicator - DPI, which reflects the density of dots per inch of the screen. When choosing a gadget, you need to pay even more attention to the DPI indicator than to the resolution, because smartphone screen sizes are different. Please note that a person with excellent vision and ideal conditions capable of distinguishing densities up to a maximum of 350 DPI. In real conditions, 250 DPI is enough. This means that for a smartphone with a diagonal of 4.5-5 inches, a display with HD resolution is sufficient. Buying a gadget with cooler display characteristics will only lead to negative consequences: firstly, the buyer will overpay, and secondly, the smartphone will discharge faster.
What screen sizes are best?
Visionary Apple Steve Jobs determined that the most suitable screen diagonal for a smartphone is 3.5 inches; that's exactly what they had popular models 4 and 4S. With a diagonal of 3.5 inches, the average user can reach even the most distant point of the display with the thumb of the hand (which holds the gadget).
However, you can now find a smartphone with such a diagonal only in a showcase with budget models. The trend of increasing display sizes continues to gain momentum - large companies are already releasing smartphone-class devices with screens as big as 6 inches! For comfortable work, 4.7-5 inches is enough - such a gadget can still be controlled with one hand. A larger smartphone will cause inconvenience both when using and when storing in your pocket.
Conclusion
When choosing a smartphone, you need to remember that chasing outstanding display characteristics is pointless - the owner of a device with a 4K screen resolution will not receive any visible advantages. On the contrary, the user will be doomed to constantly carry the charger, since the duration battery life smartphone directly depends on the display parameters.
How can you recognize the screen you need among the many symbols? It is now difficult for an unprepared buyer to make a choice. This article will orient you in this matter and will not make you feel like a “teapot” in the eyes of consultants.
In the characteristics touch displays The following terms are used:
Resolution - the number of pixels from which the picture is formed;
Diagonal – the size of the screen itself (in inches);
Pixel density (ppi) – the number of pixels per inch;
Touchscreen type – touch-sensitive coating;
Display type – the properties of the phone depend on it.
Now more details about each.
Permission
Screen resolution is very important characteristic phone, affecting the picture quality. It should be as high as possible. WITH big screen and at a low resolution the graininess of the image will be visible. Full HD screens provide ultra-clear images.
The most common display resolutions today are:
- 320x480 pixels – budget smartphones. The grainy picture is clearly visible and has the term HVGA.
- 480x800 (WVGA) – an inexpensive phone that looks acceptable with a screen up to 4 inches.
- 540x960 (qHD) – a mid-budget smartphone with acceptable image quality when the display is up to 4.8 inches.
- 720x1280 (HD) – a picture with excellent detail if the screen is up to 5.5 inches.
- 1080x1920 (Full HD) – excellent image quality.
Diagonal
Size matters these days! The screens of most smartphones range from 4 to 7 inches.
Up to four inches - a regular phone; up to 5.5 inches – smartphone; 5.5-7 inches – phablet.
Pixel Density
Pixel density is important point, when screen sharpness is taken into account. Comfort when browsing websites and reading books depends on them. It depends on the size of the screen and the number of pixels on it. On big screen with a low resolution the pixel density will be low. Today they focus on a density of 300 ppi, because... the user will not see the error in the picture. The best option will be a smartphone with an indicator of 200-300 ppi.
Touchscreen type
The most common touchscreen types: resistive and capacitive.
Resistive - two-layer, on each of which conductor tracks are applied. It is no longer popular and was installed on budget phones.
Advantages: low cost and response from pressing any object.
Disadvantages: they scratch quickly, are short-lived, and the screen brightness loses over time.
Capacitive screens do not scratch easily and have good brightness. They are complex, which is why they are expensive. They only respond to finger touches. This technology works by leaking current when touched with a finger. Sometimes glass is used together with touch film.
Many modern expensive models use tempered glass GorillaGlass providing scratch resistance.
To prevent the glass from becoming dirty, it is coated with an oleophobic coating.
Display type
Modern displays are: LCD (liquid crystal matrix) and OLED (organic light-emitting diodes). The most popular is LCD, divided into TN, IPS and PLS.
TN are the most common due to their low cost and fast response. But they have a poor viewing angle and poor color rendering.
IPS - came to the world of telephony from monitors. This expensive technology with excellent color rendition, good viewing angles, contrast and clarity.
PLS is a much improved TN matrix that costs less.
OLED and AMOLED displays use LEDs instead of an LCD matrix. They do not need a backlight, which is installed around the perimeter of the LCD screen.
Disadvantages: unreliable, high energy consumption.
There is an upgraded Super AMOLED system. It has impressive colors, brightness and viewing angles.
The screens in modern mobile phones amaze the imagination and delight the eye: sometimes it even seems that the colors on the screen look more realistic than in life! These days, the quality and type of display can become decisive factor when choosing mobile phone, therefore, we decided to talk about the different types of screens used in modern mobile smartphones and phones, or rather about their advantages and disadvantages.
Everyone has heard such terms as “AMOLED”, “Super AMOLED” and even “Retina display”, which, let us remember, is used in Apple iPhone 4. But few people know that, for example, “Retina display” is just a TFT screen with extremely high resolution, a Super AMOLED differs from a regular AMOLED screen not only by a twenty percent increase in brightness, but also by a significant reduction in the thickness of the screen itself, as well as its power consumption.
In this article we will talk about these and others interesting facts. But first, a little theory.
STRUCTURE OF MOBILE PHONE DISPLAYS
TFT screens based on liquid crystals consist of two polarizing filters (vertical and horizontal); Between these filters there are electrodes, which in turn are in direct contact with the liquid crystals. The color filter is responsible for the color of the pixel. When voltage is applied, the LCD molecules change shape, which makes it possible to influence the transmission (or non-transmission) of light, that is, to form the color of the pixel. An indispensable attribute of TFT screens is the light source, or rather, backlighting of the display. Light, passing through the structure described above, takes on the required color (color).
OLED screens are based on organic light-emitting diodes. When an electric current is passed through, the diodes emit light of a given color. This determines the main difference between OLED displays and TFT displays: “diode” screens do not require “background” display backlighting, without which not a single TFT mobile phone screen will work.
RETINA DISPLAY: EXPOSED
Translated from English, the word “retina” means “retina”. This display name (more correctly, this is Apple’s marketing ploy to promote the Apple iPhone 4) is based on the assertion that the retina of the human eye can process maximum amount image details with a resolution of 300 dpi at a distance of 30 centimeters. According to Apple, making screens of higher resolution is unreasonable and irrational, although some experts assure us that the human eye, from the same distance, is capable of recognizing and processing information from a 470 dpi display.
Be that as it may, the Retina display in the Apple iPhone 4 is distinguished by high resolution (with an incredibly small pixel size: only 78 micrometers), as well as stunning viewing angles, since it is actually made according to IPS technology. However, Retina display is still a TFT screen with all the attendant disadvantages and disadvantages.
TFT VS AMOLED
TFT touch screens, roughly speaking, consist of 4 layers: protective glass, touch panel, screen itself and backlight. OLED displays, as we have already found out, do not need backlighting, and therefore consist of 3 layers: glass, touch panel and screen.
What does this difference give us, users? Firstly, of course, shorter response times (especially when it comes to AMOLED displays, that is, OLED with an active matrix). Secondly, OLED screens traditionally have higher brightness and contrast, although TFT displays made using IPS technology can be compared to AMOLED screens in these indicators. But it is unmistakable to distinguish TFT display OLED allows black color: it is impossible to achieve truly black color in TFT screens, due to their mandatory backlighting. But in OLED displays, as they say, “black is black”.
BENEFITS OF SUPER AMOLED
The main achievement of Super AMOLED technology is that it allows you to remove another extra layer from the AMOLED screen. Touchpad is no longer needed, it is integrated into the display itself, located under protective glass. Naturally, this allows the screen thickness to be reduced (by about 40% compared to AMOLED displays and almost half compared to TFT matrices). Moreover, the two-element circuit provides better light transmission, better color rendition and higher brightness Super AMOLED displays compared to AMOLED screens (not to mention TFT displays, even those based on IPS technology). The last but not least important advantage of Super AMOLED is the behavior of this type of screens in the sun: according to independent experts, this technology allows you to increase the volume of perceived information by 20% when direct sunlight hits the screen.