What to change the screen or touchscreen. Optical touch screens

The screen of any iPhone can be considered the most important component of the device. Of course, if you do not take into account the amount of memory, operating system, the overall quality of the device, but judged only by appearance. And since the screen is so important, you should treat it with care. But practice stubbornly shows the opposite. Although it must be admitted that this part of the smartphone is the least secure and the human factor has almost nothing to do with it. Materials that cover the front iPhone part, can fail and this is where the fun begins. We run to the service center and ask in a trembling voice to replace only the glass and not touch the display itself.

- So do we change the glass or the display?

- Is there a difference?

That's all the short dialogue demonstrating our incompetence. Therefore, let's try to find out the difference between replacing the glass on an iPhone and replacing the display.

There is a difference

First of all, it should be firmly understood that glass and iPhone display it's like a chandelier and a light bulb. There is no point in replacing the entire chandelier if only the light bulb has burned out, but you can replace the entire chandelier along with the light bulbs or leave them from the old chandelier. Did you get the point? The touch glass and iPhone display are two parts that we are used to calling either a screen, a monitor, or something else. But the essence remains the same: glass and display are not the same thing, although they are mechanically connected to each other and form a display module.

So that our fingers can work wonders on iPhone screen, the devices are equipped with sensitive touch glass, which is installed on top of the display. Consequently, each of these parts has its own functions and purpose: the glass is responsible for finger touches, and the display displays the image.

You don't need to be Einstein to guess: you can replace the glass and display separately if one of them has stopped performing its function. The display may fail, but the touch layer remains fully functional. A similar situation occurs if the parts are swapped: touch glass may be damaged, but the display remains operational.

A spoon of tar

Everything that was said above is the holy truth. But there is one caveat that somewhat aggravates the situation. The fact is that earlier iPhone models actually had a display module that could be disassembled into its components. The later iPhone series are designed in such a way that the display module is not disassembled and is treated as a single whole. Is it good or bad, whether it is advisable or not is not for us to decide. So far, for the iPhone starting with the 4th model, it is impossible to replace the glass and leave the display the same, or vice versa.

But nothing is impossible. The touch glass and display are securely glued together, and you have to try hard to separate this cake. Not every master and not every service center will undertake such an operation. It is simpler and more reliable, although much more expensive, to replace the entire display module if it breaks.

But only use original spare parts! Because native, certified and original is the key long use And correct operation. And everything else, of dubious production, means new headaches and a shattered nervous system.

Brief description of the process

Replacing glass on smartphones accounts for approximately 65% ​​of all repair cases. Therefore, the service center technicians had to get their hands on it to make this operation successful. The third generation iPhones were easy to repair - the display and glass were separate. But in the next generations of smartphones, glass replacement required the intervention of special tools. The separator (that’s what the tool is called) heats up the display so that you can easily separate the glass using a special string.

Important note: spare parts (glass or display) can either be removed from another similar device, or be close in quality to the original ones. The second option does not mean that the glass or display will necessarily be from Apple. You shouldn’t be afraid of the first option either: among the iPhone cemetery there will always be “donors” with a fully working display or intact glass.

Let's find out! We'll try to figure out what went wrong.

Let's start with the reasons. Let's divide them into groups, like everything related to technology. You have heard more than once in your life that the warranty does not cover mechanical damage and liquid spills. Let's start from this.

We can talk for a long time about flooded devices and the reasons for sensor failure after liquid ingress. There can be a lot of them! Liquid and current, this mixture is unpredictable! And it is unpredictable because it can damage almost any element of the system. Or maybe even after liquid gets into the device everything will be fine; after it dries completely, it will work as before. But let me make a reservation right away: you shouldn’t flatter yourself with hopes that everything will pass and the gadget will “come to life”!!!

It can “come to life” only if it has been turned off, sometimes it “comes to life” if it is immediately turned off, but the main thing is that after everything it has dried thoroughly. So with a guarantee that short circuit when turned on, it will not happen. And here there is one important condition, the liquid in which the equipment was “bathed” or filled was WATER. Yes, if it was water, there are chances. If it's sweet tea, beer, wine, juice. Everything that contains sugar, gases, dyes, any impurities. This is detrimental to electronics. Be prepared that after this, expensive repairs may be required, and if water gets in, don’t relax, the repairs can affect everyone. It’s better not to risk it, but to take it to the nearest service center, let them clean it, and restore the damaged parts if necessary. To make a device non-repairable, you need to either complete absence spare parts, which is extremely rare or something fantastic, for example, splitting a device with an ax. Then the opportunity to repair will disappear. But we are talking about liquid ingress; repairs will depend only on the feasibility of restoration. The result is filled in - we go to the service.

Now let's move on to the axe. Just kidding, although an ax is a useful thing, we won’t consider it. Still, if a hatchet actually went through your device, send us a photo, it’s interesting to see. Save the leftovers as keepsakes. (Let's post best photos In this article).

Speaking about mechanical damage, you need to clearly understand that they are all consequences of an impact! There is no such thing as a sensor cracking like ice on its own. Well, since we decided to find out what to change, we need to understand the force of the impact and the scale of the damage. IN any device with a sensor, d The display module consists, roughly speaking, of two parts - a touchscreen and a display. The display is responsible for the picture, the touchscreen for interaction with the device. And if your device shows “signs of life,” then it will need to be repaired.

If the device does not show “signs of life,” then take it to the service center and, after diagnostics, make a decision on the advisability of repair. “Signs of life” when the display and sensor are not working, this is any confirmation of the operation of the device, indication, vibration, sound... This means that the “victim” is still “conscious”, and not all is lost. And if there are no “signs of life”, then only diagnostics can reveal the breakdown; now all devices are repairable, it’s a matter of price. We know of cases where, for the sake of information, the same device - a donor - was purchased and the memory was resoldered. After all, in most cases, personal gadgets become storekeepers of information that are of particular value to the user. Let's move a little away from the topic, let's return to display modules and their mechanical damage...

For modern devices, as a rule, there are 3 replacement options:

• touchscreen

• display

• module (this is a touchscreen and display assembly)

touchscreen- an information input device, which is a surface that responds to touches.

display- an electronic device designed for visual display of text and graphic information.

module- a device designed to visually display information with a touch-sensitive surface.

What does the display module consist of?

Without going into details, the module consists of: touch glass (touchscreen) and display, glued together. Glue provides better color rendition, without an air gap, the picture looks “juicier”. And this method prevents dust from getting between the layers.

IN Lately An active race has begun for display production technologies: LED, AMOLED, IPS, AHVA, PLS. Everyone wants to make their screen brighter, more accurate, and juicier. We will not touch on manufacturing technologies and their differences. But anyone modern display consists of: a polarizing layer, it is needed for more accurate color rendering, the display itself and the backlight.

As a rule, a module is a part completely ready for replacement. Exceptions include some variations where a frame may be required to install the module. The frame serves for tight gluing of the housing and the module. Often, if you repair it yourself, it’s easier to install the module...

So let’s move on to the “symptoms” and consider the options.

• The touch glass is intact, the display is broken.

  Such situations are not fantastic; if the touchscreen is not glued to the display, then it may turn out to be more flexible than the display. And then, at the moment of impact, the sensor will bend and the display will be damaged. After all, touch glass does not imply the presence of glass as such. Now sensors are made from scratch-resistant polymers. While the displays mostly have a fragile glass coating. In such a situation, the display needs to be replaced.

• There is a “cobweb” on the glass of the device, the sensor works, there is an image.

  In such a situation, it’s up to you to decide aesthetically, if it suits you, then use it to your health. Paste the film so as not to get hurt.

• There is a “cobweb” on the device’s display, the sensor does not work, but there is an image.

  If we are talking about a phone or tablet, then it is impossible to use such a device. Definitely replacing the touchscreen or module assembly. If you have a laptop and it does not interfere with your work, then use it to your health.

• There is a “cobweb” on the device display, the sensor does not work, the display is broken.

  Definitely replacing the module, or the touchscreen and display together, in such a situation it is also impossible to use the device.

A simple table for self-diagnosis; it is visually easier to perceive the information.

"cobweb" on glass	sensor works	display is working	recommendations
No	Yes	No	replacing display or module
There is	Yes	Yes	replacing the touchscreen or module
There is	No	Yes	replacing the touchscreen or module
There is	No	No	module replacement

Legend:

• "Cobwebs" on the glass - the presence of chips and/or cracks.
• the sensor works - the device responds correctly to touch.
• The display is in good working order - the display is in full working order, does not ripple, shows “like new”.

Do not be biased by the table, recommendations for replacing the module, everywhere. Yes, the module is more expensive, but the cost of replacing a module is often lower, and it is also faster and more reliable. Usually, if the display was originally glued to the touchscreen, replacing the module In the end it won't be much more expensive than replacing the touchscreen. After all, not all services will undertake to unstick the module; there is a high risk of damaging the display with a piece of touch glass, and sometimes this is simply technically impossible to do. And simply because most equipment does not have separate touchscreens for sale. Therefore, whenever it is necessary to repair equipment with a sensor, we are talking about laptops, tablets and phones. First of all, find out about the possibility and cost of a separate replacement of the display or touchscreen, and compare it with the cost of the module.

We hope that this information was helpful to you, Site Team.​

For driving modern gadgets There is no longer any need to press buttons, just touch the screen. This became possible thanks to the touchscreen (among experts it is simply called “touch” or “touch panel”), which has become an integral part of smartphones and tablets, including iPhones and iPads. It is not surprising that due to frequent use it often breaks down and becomes a headache for the owner of the device. If you understand what this component is and by what principles it works, you can quickly detect a malfunction and avoid awkward situations when contacting a service center.

What is a touchscreen

This term was formed from two English words - touch and screen, which literally translates as “touch screen”. The history of its appearance is long and occurred in several stages. The world's first finger-controlled display was invented and described in his scientific works American E. A. Johnson in 1965. Five years later, Dr. Samuel Hurst, through experiments, developed resistive touch screen, and the actual physical production of the product began only in 1973.

Currently, city residents deal with touch panels almost every day: not only smartphones and tablets are equipped with them, but also ATMs, information terminals and payment acceptance points. Touchscreen connects to display and is sensitive to any touch. It can be described as an information input device that serves to replace a keyboard.

It is important to know that the touchscreen is only part of the overall design, responsible only for the sensor. To transfer an image a display is used, which is a liquid crystal matrix. The unity of these two elements is called a display module, which is practically the main component of any high-tech device.

How the touch panel works

The principle of operation of the touchscreen is simple - any touch on it triggers some function or entails certain actions. The physical features of its operation directly depend on the type of touch panel. There are seven of them in total, but the most common today are three of them.

The cheapest to produce, resistant to dirt and temperature changes. Comprises glass panel and plastic membrane, between which insulators are located. Any pressure causes the glass to push through the micro-insulator, and the membrane and panel close. After this, a special controller reads the changes and converts them into contact coordinates. Weak sides This model has low light transmission, short service life and a high risk of damage if dropped.

Capacitive screen

More reliable and durable, but vulnerable to bad weather, water and pollution. It uses a special touch glass coated with resistive material. passes through it alternating current, which is supplied by electrodes located at the corners of the screen. That is, when you touch the touchscreen, a current leak occurs, which is detected by special sensors. They register these changes and transmit them to the controller.

Surface acoustic wave sensor

One of the most complex screens. The peculiarity of its work is that in the thickness of the glass there are ultrasonic vibrations. When you press the touchscreen, the waves are absorbed and converted into an electrical signal, which is then transmitted to the controller. The advantage of this technology is its long service life, equal to at least 45 million touches. The main drawback is that the screen is extremely sensitive to dirt and electromagnetic interference.

In addition to this, there are several more varieties touch panels. These include:

• Projected capacitive. On the inside of such screens there is a grid of electrodes, which, when pressed, forms a capacitor, the capacitance of which is measured by electronic sensors.
• Infrared. Along their edges there are light emitters and receivers in the IR range; when you touch the screen, part of the light is blocked and thereby the location of the click is determined.
• Tansometric. They are based on simple fixation of screen deformation, are resistant to damage and are often installed outdoors.
• Induction. Inside them there is an inductance coil and wires; when such a screen is touched with a special tool, the voltage of the existing magnetic field changes.

How to check the touchscreen

The touchpad may not work correctly due to physical damage mobile device, for no apparent reason. The following factors indicate that the problem is in the sensor:

There may be several reasons for such a malfunction:

1. Display dirty. If you do not wipe the sensor promptly by special means, then during operation it becomes abundantly covered with fingerprints and greasy marks, which can reduce its sensitivity.
2. Violation temperature regime . Too high or low temperatures, as well as their strong drop - common reason touchscreen malfunction.
3. Damage to the cable. It can peel off from the glass due to mechanical damage, thereby disrupting the connection between the latter and the touch coating.
4. Moisture ingress. If there is liquid inside the gadget, oxidation of the contacts may occur. Sometimes the problem can be solved with a hair dryer.
5. Crash software. In this case, you need to reflash the device; for this you will need a USB cable and the software itself.

How to replace the touchscreen on your phone yourself

Before removing the touch screen, you should turn off your smartphone, remove the battery and SIM card. It is important to remember the disassembly sequence so that you can later put the device back together without damaging the internal elements. Some models may require complete disassembly of the housing, which requires special knowledge. To replace the touch screen on your phone with your own hands, you need to prepare special equipment in advance, namely:

The process of replacing the touchscreen is as follows:

1. Take off back cover telephone;
2. Screwdriver remove all bolts along the perimeter of the body;
3. Carefully insert the spatula between the housing fastening and pry;
4. Hairdryer warm up the glue connecting the sensor to the matrix up to a maximum temperature of 80 °C;
5. Pin to display suction cup, which will allow you to separate the touchscreen from the matrix;
6. Apply thin layer of glue and install a new touchpad;
7. Carefully press it and remove any remaining glue;
8. Reassemble the device in reverse order.

What is the difference between touchscreen and display

The display is the part of the smartphone on which the image is displayed. He is the conductor visual information and makes it accessible to the human eye. A touchscreen is a touch glass, the main purpose of which is to call a particular function. That is, he is only information input tool, but no conclusion.

If the phone is broken and cobwebs appear on it, but the screen continues to work and you can clearly see the picture, then only the sensor needs to be replaced. When the device distorts the image and shows blots, you will have to change the display, which is more time-consuming and cash procedure.

Touch screens have become widespread due to their convenience.

Term Touch Screen formed from two English words. The first means “touch”, and the second means “screen”. This phrase fully conveys the principle of operation of this type displays, which consists of responding to the touch of a person’s fingers and performing certain actions. Although this type technology seems modern to us; the date of invention of the first touch screen is considered to be 1970. It was then that a university teacher from Kentucky, Samuel Hurst, was the first to decide to simplify the process of reading information from recorder tapes. The result of the scientist’s development was the appearance of the world’s first screen that supports the technology touch input.

FOR YOUR INFORMATION!

The new product used the most primitive type of operation: a four-wire resistive method for determining the coordinates of the touch point.

The first devices to receive similar system input of information, computers began to appear, and only in 1998 the first cellular telephone, which used touch typing. It was the brainchild of Alcatel. Next, Ericsson offered its version of a touchscreen in a mobile device. But these prototypes had little resemblance to modern versions touch screens.

The panel was monochrome, small in size and only allowed the user to dial a number. The first model where the touch screen acquired a modern shape was the communicator from HTC Qtek 1010/02 XDA, released in 2002. But for quality new level the idea of ​​using a touchscreen in mobile devices oh brought it out Apple company, which implemented Multitouch capability, or response to two or more fingers touching the screen at the same time.

IMPORTANT!

The invention and mass introduction of touchscreens brought a large number of positive aspects for the user and increased the usability of the smartphone. But this led to one significant drawback - the devices became more “delicate” and required careful attitude, since damage to the glass could destroy the entire sensor.

One of the areas of application of the touchscreen is graphics tablets, the use of which simplifies the process of creating animation

What is a sensor and where is it used?

Modern people can no longer imagine their lives without devices that have touch input, this invention has become so firmly established in life. According to statistics, more than 90% of the entire population of the Earth has at least once encountered a touchscreen, which is used in a variety of electronic devices and gadgets:

• smartphones;
• tablets and tablet computers;
• banking or payment terminals;
• devices for purchasing electronic tickets;
• displays (computer, in refrigerators, household appliances).

The development of touch technology is not limited to mobile devices. There are developments where the touchscreen is embedded in large surface areas.

FOR YOUR INFORMATION!

Not long ago, a smart desk was announced, the surface of which is one large touchscreen. A similar tabletop can be used as multimedia center V " smart home" Also, a few years ago, an entire touch wall was introduced, by pressing any area of ​​which you can call up various functions.

The interactive wall is a technology of the future that also uses a touchscreen

Some non-technical people wonder what a touchscreen on a tablet is and how it differs from a similar input device on a smartphone. The answer to this question is simple - nothing, since the principle of operation of the touch screen is similar, regardless of the device in which it is used.

In a special publication on our portal we will talk in detail about sensory inexpensive smartphones. Can you find out if budget smartphone to be good: advantages and disadvantages, how to choose a smartphone based on parameters: display, memory, processor.

How does the touch screen work?

To fully understand what a touchscreen on a phone is, you need to understand what the smartphone screen is made of and how the sensor works. The main elements of the touch screen are:

1. A matrix consisting of a layer of liquid crystals. Similar display surface technology is used in a television or computer monitor.
2. Microdiodes, which are located in the second layer under the matrix and serve to illuminate the working surface.
3. Diodes located on the surface of the imaging layer, which are the main touch processing tool.
4. Glass that covers the screen itself and prevents it from damage.
5. Anti-glare coating prevents glare and allows you to comfortably look at the screen in sunny weather.

The simplest diagram of a touchscreen device

Based on how the touchscreen works, there are a number of advantages and disadvantages similar technology user dialogue with electronic device, which are divided into pros and cons for stationary devices and mobile equipment.

pros	Minuses
Stationary devices
Increased level of reliability.	Lack of tactile feedback.
High wear resistance, dust resistance and immunity to small impacts.	Placing the device at the level of the human body leads to hand fatigue during prolonged use.
	A small keyboard may cause errors or typos.
Mobile devices
Easy to use.	Lack of tactile sensations.
At small size The device itself has the ability to create the largest possible screen.	Some matrices consume a large amount of energy when illuminated for a long time, which leads to the need for frequent charging.
Convenience of dialing even large volumes text.	Mechanical damage can lead to damage to the touchscreen.
There is an evolution of touch input technology, which leads to the emergence of qualitatively new devices with better capabilities every year.	Lack of the required level of hygiene.

FOR YOUR INFORMATION!

Many manufacturers, especially stationary devices that use a touchscreen, due to their shortcomings, have taken the path of duplicating the ability to input with mechanical keys. This is necessary if the touch screen fails.

The sizes of modern touchscreens depend on the needs of the manufacturer and the device in which they will be used

Types of touch screens

The general classification of touchscreens that are on the market involves dividing them into varieties based on type and design features. The most commonly used are resistive and capacitive types, which are used in most mobile gadgets. There are also:

• matrix;
• infrared;
• projective capacitive;
• optical;
• DST sensors;
• wave;
• induction

The resistive sensor is considered “last century” due to imperfect technology

Resistive touch screen

When talking about what Touch Screen is, the first thing we should mention is resistive screens, which became the first in mass production. Such screens consist of two transparent plates made of plastic, onto which a thin conductive mesh is applied. A dielectric layer is installed between the plates, which is required to sense pressure on the desired area screen by the user.

When the owner of the smartphone performs an action (for example, clicking on the desired area of ​​the screen), the dielectric in this place moves apart, which leads to the contact of the two plates with each other. A current appears, which is registered by a special controller that determines the specific pressing point using a coordinate grid. Next, this data enters the processing program, which, according to a pre-created algorithm, performs the necessary action.

Special electrodes located at the corners of the matrix are responsible for determining the coordinates of the pressing point.

Resistive screens, in turn, are divided into two subtypes:

1. Four-wire sensor. They are made from just one panel made of glass and a plastic membrane, onto which the resistive supply of the screen itself is applied. All free space between glass and plastic is filled with insulators. When you press, the circuit closes, which leads to the appearance of the coordinates of the point of contact.
2. Five-wire. A distinctive feature of this type is the absence of resistive support for the membrane and the presence of a conductive layer. This provides greater reliability, since even after the matrix is ​​damaged, it continues to work. The pressure point is tracked by the degree of change in membrane voltage.

FOR YOUR INFORMATION!

There are also eight-wire resistive screens that improve the accuracy of touch processing, but do not increase the reliability of this type of sensor.

Minus resistive sensor is the lack of multi-touch support

Speaking about resistive touch screens, it should be noted their low cost, the ability to press with a finger, stylus, or even a gloved hand. The disadvantages include:

• low degree of conductivity of light rays;
• susceptibility to scratches and cracks due to impact;
• lack of multi-touch;
• short service life, which averages no more than 34 million clicks;
• the impossibility of implementing the function of sliding across the screen, since the resistive matrix only responds to pressing.

Capacitive touch screen

The modern type of matrix is ​​a capacitive screen type. What it is? The essence of the work of this type is to follow the laws of elementary physics, namely the property of an object with a larger capacity to conduct alternating current.

At the heart of the work capacitive type lies the rule of electrical potential difference

In terms of its structure, this type of matrix is ​​a glass plate, on the surface of which a layer of resistive material is applied.

FOR YOUR INFORMATION!

As the best resistors in in this case alloys of indium oxide and tin oxide are used.

At the corners of the screen there are electrodes that apply a small voltage to the entire surface of the matrix. Upon contact with a person’s finger, a leak occurs, which is recorded by sensors and transmitted to the processing controller, which calculates the coordinates of the point of pressure. Distinctive features of this type of screens are long term service, which is more than 200 million clicks, increased transparency, the ability to not leak liquid. But the surface of this sensor still remains vulnerable to mechanical impact, so similar types of matrix are used in stationary devices located in areas protected from impact. external factors place.

Most modern mobile devices use projected capacitive sensors

Projected capacitive sensors

Speaking about what a touch screen is, you should definitely note the type of matrix that is used in most modern smartphones And tablet computers. We are talking about a projective capacitive sensor. A design of this type is represented, in addition to the usual panel, by a grid of electrodes that are applied to reverse side matrices. The existing electrodes, together with the human body, form a capacitor, and built-in electronics are required to measure the capacitance of the resulting system.

FOR YOUR INFORMATION!

One of the leaders in screen production, Samsung company, managed to fit pressure-sensitive electrodes between sub-piskels, allowing for simplified design and increased transparency.

Increased transparency, the ability to use thick glass (up to 19 mm) - all this reduces the risk of damage to projection-capacitive screens, which is why they are installed in devices located in open areas.

In the infrared sensor, the principle of operation is to interrupt the IR rays at the point of contact

Matrix and infrared touch screens

Among the varieties of sensors, we can mention two not very common types - matrix and infrared screens. Matrix work according to general principles resistive structures, but they distinctive feature is simplicity. Vertical conductive strips are applied to the membrane surface, and horizontal conductive strips are applied to the glass surface. When pressed, the strips come into contact, and the controller calculates the location of contact and determines the coordinates of the point. A significant disadvantage is the impossibility of ensuring high discreteness of the sensor due to the simplicity of the design.

Infrared types use a similar principle of intersecting stripes that represent infrared rays. When you touch the screen with any object, the grid of rays is interrupted at this point. This type is used on devices where it is required high definition image transmission, for example, e-books. The disadvantage of the IR sensor is its susceptibility to contamination.

Interactive maps use strain gauge type sensor

Optical and strain gauge touch screens

The optical type is distinguished by the presence of infrared illumination, which is distributed between the glass and the matrix, and is capable of reflecting up to 100% of light within itself. When touched with a finger, dispersion occurs. The electronics just have to create a scattering pattern to determine the pressing point. This is done in the following ways:

• installing a camera next to the projector;
• introduction of an auxiliary subpixel.

Similar types of screens are used in interactive school boards. The strain gauge sensor is sensitive to screen surface deformation. This type is characterized by increased resistance to damage, so these matrices are used on ticket selling devices and ATMs.

DST technology works on the principle of recording piezoelectric manifestations inside a glass panel when pressed with a finger

DST touch screens

The basis of this type of operation is to capture the piezoelectric phenomenon in the glass panel. Main feature is the ability to respond to touch with any object and operate in any dusty conditions. For high-quality operation, the finger must be constantly in motion.

How to calibrate the touch screen

Owners of gadgets with a touch screen often encounter a problem when the sensor stops “listening” or responding correctly to touches. This can happen due to damage to the matrix, moisture getting inside the device, or replacement of the display.

After moisture gets inside the smartphone, it may be necessary to calibrate the touchscreen

There are two main ways you can calibrate your touchscreen:

• regular means operating system;
• using third-party software.

The built-in calibration technology is almost the same for all smartphone manufacturers. To configure using standard tools, you need:

• go to phone settings;
• find the “Calibration” item;
• press at least three times to the center of the target that appears on the screen.

The device independently remembers touches and adjusts the touchscreen.

It is best to replace the touchscreen at a specialized service center.

The touchscreen does not work - how to determine it

In some cases, the touch screen may malfunction. At mechanical damage There is no need to detect a breakdown of the matrix, since it is visible to the naked eye. Signs indicating the failure of the touchscreen in the absence of external damage are:

• lack of response to touch;
• partial response of the screen to pressing, for example, only a certain area can work;
• distortions in the perception of touch.

The appearance of artifacts on the screen may indicate problems not only with the display itself, but also with the sensor

If the sensor fails, the device will need to be repaired. Modern technologies involve the manufacture of a common display module in which the touchscreen and display are combined into a single unit. Therefore, repairs require a complete replacement of the unit if it is impossible to separate the touchscreen. This can only be done in the terms of service.

Touchscreen and display: what's the difference?

The difference between these two parts lies in the functions they perform. The display is the part of the smartphone that is necessary to display images and information.

Increasingly, manufacturers are combining the touchscreen and display into a single unit

A touchscreen is a touch glass that is used to trigger the device on user actions and respond to pressing to call a certain function. Modern manufacturers have increasingly begun to produce unique “sandwiches” that use lamination technology, when the display and touchscreen are combined into a monolithic unit, glued together with a transparent sealant. This improves performance, but requires complete replacement of the part if any component fails.

Now you will look at your smartphone or tablet PC in a new way. In any case, share your experience of unlocking a “asleep screen” in the comments and ask questions to the author of the article.

Modern gadgets are distinguished by their variety, but they often break down. The most vulnerable part is the screen: display or touch glass. The differences between them are significant. If the display is broken, the picture on the phone or tablet completely disappears, streaks and blots appear. Such a display will be quickly replaced for you at almost any service center.

Touchscreen (touch glass) has several types. The difference from the display is that you need to press your finger on part of the screen to call up a certain function. Sometimes there is no touchscreen, and the display itself is protected by glass, but you won’t learn how to operate such a gadget with your fingers.

How to determine if the touchscreen is broken?

If the screen has not been damaged, but it does not respond to touch, then the cause of the breakdown is usually a failure in software. IN service centers To fix this problem, the gadget is simply re-asked. Sometimes the screen does not work due to disconnection motherboard touchscreen cable. Then only the technician will be able to replace the cable and diagnose the device.

It happens that people mistakenly think that the screen is broken. The lack of an image is the cause of problems with the matrix. To verify this, you need to connect the gadget to another device that can work with images. If you see a picture from the desktop of your tablet on it, then you will have to replace the matrix. You can find out more about the breakdowns on the website. You can also buy the necessary parts to repair your tablet there. If a malfunction occurs, it is better to immediately take the gadget to the experts.

Where can I repair glass or touchscreen?

Some people try to repair their gadget themselves. This option is not suitable if you want:

• get high-quality results,
• return the tablet to functionality,
• maintain the guarantee.

Most service centers provide gadget diagnostics free of charge. The cost of repair depends on the complexity and the need to replace the part. Sometimes it is more profitable to buy a spare part yourself and simply ask a specialist to replace it. It also happens that one breakdown hides another. In this case, independent attempts to restore functionality will not lead to anything good, they will only completely break the device.

When purchasing glass, screen or touchscreen yourself, it is best to opt for new and original parts. In this case, the gadget will definitely not let you down at a crucial moment.

If you prefer to shop online, then you will be interested in checking out the ratings of online stores presented at the link. Shop wisely! You can always take advantage of various discount programs offered by stores.