Apple used OLED screens for the first time in its iPhone X. In the past, it relied on LCD screens or "Liquid Crystal Display" which were very widespread in many cell phones.

And since Apple will use LCD screens, it will not use them as they are, as you must add their own flavor to them, so these screens have developed into what is known as the "Retina" screen, which was used for the first time in the iPhone 4, instead of having 4 pixels per inch (1 An inch = 2,54 cm) Apple doubled this to 20 pixels per inch, and the screen resolution became higher and clearer.

The pixel density per inch is symbolized by the abbreviation “ppi” or Pixels per inch, so the more pixels per inch the higher the quality of the image.

Then this technology was developed after that until we found 801 pixels per inch in the distinctive Sony Xperia XZ Premium phone provided by the giant Sony, while the iPhone 8 Plus comes with a density of 401 pixels per inch only.

There are advanced types of LCD screens one type symbolized by the abbreviation "TFT" and another type symbolized by the abbreviation "IPS" and the latter is what Apple has adopted since the iPhone 6.

LCD screens consist of several layers, one of which contains crystals arranged on a very thin surface, and these crystals are divided into a pixel, and these pixels are illuminated with a backlight so that the lighting passes over the pixels and then you see what is displayed on the screen, and since it is lit from the back, this leads to The loss of the actual black color, which leads to a decrease in the contrast in the displayed image, which is one of the disadvantages of these screens.

One of the advantages of this screen is that its production cost is low, it consumes less energy, and has higher clarity in sunlight. What distinguishes these screens is their long life.

OLED or "Organic Light-Emitting Diod" screens

The idea of ​​inventing these screens is not born today. Researchers at Eastman Kodak Company invented the fundamentals of this technology in 1987. What matters to us here is where this technology has reached, how it works, avoids its problems and makes the most of it.

How OLED screens work

These screens are made of organic materials that light up if an electric current passes through them, and do not need backlighting such as LCD screens, and the idea of ​​the screen is based on the operation and lighting of the pixels that we only need and the rest is switched off by default and does not have an electrical voltage, which is thus energy-saving in a very, very large degree . For example, if you type a specific letter, the pixels of the letter are the only ones that light up, and the rest of the pixels are completely disabled and have no electrical current.

As for the black color in this screen, it is completely closed, not illuminated, has no electric current, and is not exposed to backlight, thus acquiring a true complete blackness. Because of this, the screen has high color accuracy and contrast. What is wrong with these screens is their very high price. As well as its short life compared to LCD screens such as AMOLED and Super AMOLED, and there is no doubt that it is one of the best screens in the world today.

Apple provides advice to iPhone X users to avoid screen pixels burn

Apple stated on its website that the iPhone X screen is the best OLED screen launched in the smart phone market, and it is characterized by a very high contrast rate and an ideal degree of accuracy, because it works without backlighting, as OLED technology can emit lighting from each pixel separately, and it is done Accurate color calibration at all times for perfect viewing.

And if you were looking at the OLED screen from a far angle, you might notice slight changes in color and tone. This is a regular feature of OLED screens. With continued use in the long term, OLED screens may also exhibit slight changes. This is to be expected.

This is what we call "pixel burn-in" or "ghost effect", which is the appearance of the effects of the image that was previously displayed on the screen on the current image, and this is due to the fact that the pixels used for a long time do not lose their consistency, color accuracy and lighting at once, but gradually lose it until it disappears in end of the day.

Apple says, "We have treated the Super Retina screen to become the best among competing screens in terms of reducing the impact of" stress "resulting from the use of OLED technology.

It is no secret to everyone what happened to the Google "Pixel 2 XL", as the problem of pixel burning completely appeared after one week of using the phone. Some pictures showed that the pixels burned out in the lower half of the phone and turned gray without any external causes.

Google stated that it will conduct an investigation into this problem, adding that all products are subject to a comprehensive quality test process, and that the effect of the so-called burning pixels of the display is common and consistent with other mobile devices working with OLED screens. And that updates related to solving these problems must reach the phones as soon as possible.

Apple tips for iPhone X users to avoid pixel burn

1

 

Update iPhone X to the latest iOS version. When a new update is available, you will see an update request. You can also check for updates in Settings> General> Software Update.

2

 

Use auto lighting to be able to adjust screen brightness based on the ambient lighting in your location. This setting is on by default. To check this setting, go to Settings> General> Accessibility> Screen facilities.

3

 

Set your phone to turn off the screen when not in use. It is recommended that you choose a short time. To adjust this setting, you can go to Settings> Display & Brightness> Auto-lock.

4

 

Avoid displaying static images at maximum brightness for long periods of time. And if you have an app that keeps the screen on when your phone is inactive, you can temporarily turn down the brightness using Control Center.

If you are an iPhone X user, have you encountered this problem? Let us know in the comments.

Source:

businessinsider|engadget

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