Unlike desktop computers, functions and programs in tablets are controlled by lightly pressing the fingertip on the screen at the desired point. The tablet reacts to touch thanks to a thin transparent glass plate superimposed on the display screen. When you press on the glass (touchscreen), depending on the type of sensors, the resistance, inductance or capacitance of the mesh applied to the glass changes and thus the tablet receives instructions for a specific action.

The touch glass is very thin, but strong enough to break with your finger. But if the tablet is dropped on a hard surface or hit with a sharp object, the touch screen cracks, which is what happened with the glass of the children's MonsterPad tablet shown in the photo.

Checking the tablet's functionality using the mouse

The image on the screen was uniform without defects or distortions. The tablet remained operational, since when you pressed the Power button, a window popped up with a menu to turn off the tablet, but it became impossible to control its operation by touching the screen with your finger.

To fully check the functionality of the tablet, and the ability to turn it off before repair, it was necessary to connect a mouse to the Micro USB connector located on the side of the tablet. Mice usually have a USB connector. Therefore, I had to buy a USB-Micro-USB adapter.

When a mouse was connected, the tablet system automatically detected it, and an arrow-shaped mouse cursor appeared on the screen. Diagnostics showed that the tablet’s electronics are in good condition. Therefore, to repair the tablet, it is enough to replace the touchscreen with your own hands. After diagnostics, the tablet was turned off using the mouse.

While waiting to purchase a touchscreen, it is necessary to keep the tablet's battery charged, since deep discharge sharply reduces the tablet's battery life.

Where can I buy a touchscreen for a tablet?

The search for a store to purchase a touchscreen for a children's tablet MonsterPad at a minimal cost led to the website of the time-tested Chinese online store AliExpress. The site presented a large assortment of sellers of touchscreens for the MonsterPad tablet.

A seller with a large number of positive reviews and a high rating with an average price and free shipping was selected. When choosing a touchscreen, pay attention to the presence of double-sided tape on it. If the screen is without adhesive tape, then replacing it will be complicated by the need to purchase such adhesive tape, cut it and secure it.

If you can’t find a touchscreen by the name of the tablet, you can try searching by its markings, which are usually applied to the flat cable running from the touchscreen.

The touchscreens of many tablet models are interchangeable. The main thing when choosing is to pay attention to the type of sensor and its diagonal size, expressed in inches. For example, the MonsterPad requires a 7" touchscreen.

The resulting parcel was a large, compared to the size of the touchscreen, polystyrene box completely wrapped in adhesive film. It is convenient to open such packaging by cutting the film with a knife along the line of connection of the box halves.

The touchscreen was removed from the packaging and carefully inspected for defects. Everything was in perfect condition. Trying on the glass on the tablet confirmed the size matches. To check its functionality, all that remains is to disassemble the tablet and connect the touchscreen to the motherboard.

How to disassemble the MonsterPad children's tablet

Before starting to repair the tablet, to avoid scratches on its case and display and dust getting between the display and touch glass, you need to wipe the table with a damp cloth and cover its surface with a soft, lint-free cloth. The only tools you need are a knife and a couple of small screwdrivers with a Phillips and a flat blade. After preparing the workplace, you can begin repairs.

The MonsterPad children's tablet is easy to disassemble thanks to the screw fastening of the back cover. Using a sharp tool, remove the four plug legs glued with adhesive and unscrew the four screws using a Phillips screwdriver.

Then, even without the help of a plastic card, grab the case halves with your fingernails in the area where the tablet's power button and connectors are installed, and carefully move the halves apart. The power and volume buttons must be immediately removed and set aside so that they do not get lost and cannot scratch the tablet screen if they fall under it.

The tablet has been disassembled sufficiently to begin replacing the touch glass. All that remains is to remove the cable coming from the touchscreen from the connector. In the photo the connector is in the far right corner.

If the tablet was disassembled to replace the battery, then its type is clearly visible in the photo. To replace the battery, you first need to unsolder the red and black wires coming from it from the motherboard and carefully remove it, overcoming the adhesion force of the double-sided tape.

To release the touchscreen cable, you need to use a screwdriver blade to move the clamps a couple of millimeters in the direction indicated by the red arrows in the photo. After this, the cable can be removed from the connector without effort.

How to check the touchscreen before installing it in a tablet

After removing the back cover from the tablet, it became possible to test the new touchscreen for functionality. To do this, without removing the protective film, you need to place a new touch screen on the broken one, carefully turn the tablet over, and observing the numbering of the cable, insert it into the connector on the motherboard and return the latches to their place. Then turn the tablet over with the display facing up and turn it on using the power button.

After downloading the software, you need to tap on any icon or just work a little on the tablet. If there is a reaction on the display when touching and scrolling through pages, then everything is in order and you can start replacing the broken glass. Before starting the repair, you must turn off the tablet with the power button and disconnect the cable of the new touchscreen from the connector.

How to remove a cracked touchscreen

To remove a cracked touchscreen, use the end of a knife to pry it at any of the corners and try to lift it up.

In the MonsterPad tablet, the glass was glued weakly; there was no need to even heat the glued area with a hairdryer. The force of the fingers was enough to peel it off. The main thing is not to rush and perform this operation very slowly and smoothly.

Preparing the tablet frame and installing the touchscreen

After removing the cracked touchscreen, use a rag soaked in alcohol to degrease and remove any remaining adhesive from the frame.

Fortunately, the cracked glass did not crumble into pieces and there was no need to use a vacuum cleaner or hair dryer to blow off the small fragments. For the same reason, it is not recommended to scrape off glue residue with a tool.

To ensure that the cable did not interfere with the positioning of the touchscreen when gluing, a piece of polyvinyl chloride tube was inserted next to its release hole, as in the photo.

In the next step, the protective film was removed from the touchscreen from the applied adhesive layer to the edges.

All that remains is to tuck the cable into the hole in the tablet frame, rest the corner of the touchscreen near the cable into the notch of the frame and slowly attach it to the frame, controlling the accuracy of the placement in the opposite corner diagonally.

The touchscreen fit into the recess of the frame exactly, without gaps or displacement on the first try. There is no need to press the glass tightly at this stage of repair. It is advisable to do this after fully assembling and checking the operation of the tablet.

The cable is long enough, which is convenient for installation. However, to prevent the cable from breaking if it gets caught between the covers when they are closed, it must be folded in half and pressed a little, avoiding sharp bends.

All that remains is to install the pushers of the buttons for turning on the tablet and adjusting the sound volume and snap the back cover to the base of the tablet. Screw in the four self-tapping screws and install the removed plugs on them.

The independent repair of the tablet was successfully completed, it began to work and look like new, and the child can play his favorite games again. Now, I believe, he will be more careful with his tablet and other gadgets. I did not remove the protective outer film from the touch screen; let the owner of the tablet remove it and be the first to tap (touch) the surface of the screen.

I hope that the step-by-step instructions provided will help any home craftsman, even those who do not have experience in repairing such devices, cope with the repair of a tablet or smartphone.

The cost of replacing the tablet's touch glass with your own hands was less than 10% of the original cost of the tablet.

Articles and Lifehacks

Surely many users have previously heard of the term touch-screen. Our article will briefly tell you what a touchscreen is on a tablet, as well as how to replace it.

What is this element and what does it look like?

• This term was borrowed from the English language, where the word “screen” means “screen” and “touch” means “touch”. In other words, we mean a touch screen that can be controlled using your fingers.
• This display is used on modern smartphones, tablets and tablet computers. This is quite convenient, given that the user no longer needs an external keyboard to enter text, or a mouse to enter commands.
• The touchscreen is also called a touchpad. Such a panel can be capacitive, resistive, or even ultrasonic. Each of them has its own advantages and disadvantages. The most inexpensive panel is considered to be one made using resistive technology.
• Unfortunately, it often stops working, and many users think that the problem is with the display. This plays into the hands of unscrupulous service workshop workers who, instead of replacing the sensor, replace the entire screen, thus earning significantly more.
• In fact, replacing the touchscreen is very simple, and it is relatively inexpensive (for example, you can buy it on ebay).

Replacing the touchscreen

To replace the touch-screen, we will need tweezers, a utility knife, a set of small screwdrivers (including a Phillips screwdriver) and a hair dryer (preferably a construction hair dryer, although, in extreme cases, an ordinary home hair dryer used in everyday life will do).

Please note that the difficulty of replacing the touchscreen depends on the tablet model. For example, in Nexus 7 it is actually impossible to change only the sensor and glass - a modular replacement will be required.

This is due to the fact that the glass and matrix are already connected. Of course, if you lack sufficient skills or the obvious complexity of the entire process, it is better to contact a specialist.

1. If we nevertheless decide to start replacing the sensor, first we need to find two screws near the connector where the charger is connected and unscrew them with a screwdriver.
2. After this, we pry up the frame using a stationery knife or spatula and slightly move it to the side on all sides.
3. We unscrew the corner and end screws, remove the cover on the back of the device, the battery and the cables.
4. Now we take a hairdryer and heat the edge of the touchscreen. The main thing is that the temperature is not too high, otherwise there is a high probability of spots appearing on the matrix.
5. Being careful, we insert some thin object (like a stationery knife) between the device body and the glass and heat the glass where it is located. This way the sensor is gradually moved away and removed. In this case, you should monitor the safety of the matrix.
6. After we have removed the sensor, we get rid of the remaining tape and dust and begin to glue the new touchscreen. To do this, we will need to glue double-sided tape (it is advisable that it is no thicker than 1 millimeter).
7. It is recommended to first verify that the new sensor is working properly.

To control modern gadgets, there is no longer any need to press buttons; you just need to 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 by the American E. A. Johnson in 1965. Five years later, Dr. Samuel Hurst, through experiments, developed resistive touch screen, and the physical production of the product itself 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. The weaknesses of this model are 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. An alternating current passes through it, 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 types of 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 either if the mobile device is physically damaged or 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 promptly wipe the sensor with special means, then during operation it will become 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, are a common cause of touchscreen malfunctions.
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 of the phone;
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. It is he who is the conductor of 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 a more time-consuming and expensive procedure.

Quite a few years have passed, and almost every second person on Earth has experienced all the delights of new technological progress. More recently, one could observe people dialing SMS or a person’s number using buttons, but modern times are making great achievements. Now almost 90% of the population uses simple touches on the screen of this or that equipment:

Demand for smartphones over the past 5-10 years has grown by almost 40-45%, which once again proves their uniqueness, versatility, accessibility, and interest in everything new.

But when buying any “newly made” equipment, when the seller talks about it, many are interested in the same question - “touchscreen”, what is this part, and what does it serve?

This article will provide extensive information about its appearance, as well as reveal all aspects of its occurrence, types and significance of its use.

Touchscreen, appearance

To begin with, I would like to pay special attention to the most interesting foreign term "tachksrin"? It came from two words, each of which has its own meaning in this phrase:

• "Touch"- touch, feel, touch;
• "Screen"- screen;
• TouchScreen- "touch screen".

Positive and negative qualities

“+” and “-” in pocket devices for communication:

• Ease of use and versatility when pressing;
• Mobile and other devices may not be particularly large in size, but the screen will pleasantly surprise you with its parameters;
• With manual dexterity and a little training, you can type text of any complexity in a matter of minutes;
• The possibilities are growing every year, which significantly increases the use and sales of these devices.

• There is no tactile transmission of the screen;
• The battery discharges too quickly with prolonged use and excessively bright percentage;
• Any mechanical impact on the touchscreen may cause malfunctions;
• The touch screen does not have a high level of hygiene.

“+” and “-” in stationary devices:

• Reliability at the highest level when using this type of screen;
• Wear resistance also prevails over other types of screens, has a high level of dust resistance, moisture resistance, and protects against small impacts.

• There is no tactile feedback from the screen;
• Working with such devices, which are located at the level of your body, leads to frequent hand fatigue, so they are used only occasionally (little, meaningfully, with quick operation for ease of use);
• When working with, in some cases the screen may be blocked by the shadow of the hands, or by the hands themselves:
• When working with a small one, errors may occur in calculations, writing, and movements on the keyboard;
• When using such displays in public places, there is a risk of contamination, which may also reduce the performance of the touchscreen. In such a situation, specialized means of protection against moisture, sweat, dust, dirt, etc. are available for sale.

During the manifestation of these shortcomings, many developers have come to the conclusion that in addition to touch data input, regular buttons should be created (even if the sensor is faulty, you can top up your account or buy a ticket using button input).

Classification

If you delve deeper into the types of touchscreens, you can identify the following popular types of screens, after which Let's look at each of them:

• Resistive;
• Matrix;
• projective capacitive;
• infrared;
• optical;
• DST touch screens;
• wave;
• induction and many others.

Resistive

The presented type consists of a pair of plates made of plastic material, inside of which there is a mesh that conducts current, the width of which reaches no more than 1-2 millimeters. The same grid can be seen when parsing. They can be safely called the “recent past”, “on the heels” of which capacitive screens are stepping.

Also, between these plates there is a layer of dielectric material, which makes it possible to carry out a certain set of software inside any sensor device, and they already ensure the interaction of all existing programs.

That is, when you touch a certain area of ​​the screen, you launch a certain process of implementing one or another function of the phone, device, etc. Coordinate points of touch on the screen (X and Y) contribute to the launch of a certain, previously programmed algorithm of actions.

Resistive ones have their own subtypes:

four-wire– they consist of one glass panel and a plastic membrane, the surface of which is covered by the resistive support of the screen. All free space between the panel and the membrane is occupied by insulators. When you press , the panel and membrane are closed, which leads to the start of the required touch coordinate, thereby launching one or another phone function (menu, viewing photos, etc.);

five-wire- in this version of the touchscreen, not resistive, but conductive, is applied to the membrane. This gives greater reliability during use, even if the membrane is damaged in some places, the device will continue to function.

There are also eight-wire, which, although they are able to work with your touch more accurately, are in no way capable of increasing the level of reliability when used.

Reading process This type of touchscreen is as follows:

• A voltage of +5V is applied to the upper electrode, while the lower one conducts grounding. The left and right are connected briefly and the voltage on them is checked. This voltage corresponds to the Y-coordinate of the screen.
• Similarly, +5V and ground are supplied to the left and right electrodes, and the X-coordinate is read from the top and bottom.

The resistance at the touch screen contacts is as follows:

• Y-,Y+=550 Om (without pressing);
• X-,X+=350 Om (without pressing);
• Y+,X+=from 0.5 to 1.35 kOm (measurements were made in different corners of the screen, when pressing, and without touching it, the resistance is infinity);
• Y-,X- = from 1.35 to 0.5 kOm (measurements were taken in different corners of the screen when pressed, and without touching it, the resistance is infinity).
• In different types of touch screens, the resistance can fluctuate from higher to lower.

If we talk about resistive touchscreens in general, it is worth noting their low cost and ease of operation: you do not need to use only your fingers; to start the operation, you can press with gloves, or with the help of a plastic card, or a stylus.

This kind of screens can be seen in medical services, in payment terminals, in industry, PDAs, etc. They are not particularly resistant to temperature changes and awkward movements of a hand or other object.

But resistive screens also have disadvantages:

• rather low degree of penetration of light rays;
• scratches, bumps, cracks, and finger stains appear on it more quickly;
• a small number of clicks to completely exhaust the vital activity of the screen. There are about thirty-four million times;
• inability to implement multi-touch;
• There is no way to use screen sliding functions, only a single press is required.

Matrix

Also one of the inexpensive types of touch screens, which are produced similarly to resistive ones, but have minor manufacturing features. Conductors of the horizontal type are applied to the panel, but conductors of the vertical type are applied to the membrane.

As soon as you touch any point on the touchskin, these conductors come into contact, and the required function performs its work. When the matrix screen malfunctions, it is replaced with a resistive one.

Projected capacitive (PCSE) (Capacitive)

At the bottom of the touchscreen there is a grid of electrodes, each of which, together with human heat, is able to form condensation.

It was not difficult to create sensitive electrodes between the subpixels of the screen, which makes it possible for it to be more transparent, and the equipment to be more durable in use.

Projected capacitive screens are almost 92% transparent, which makes them possible for long-term use, and the use of glass up to 19 mm reduces the risk of damage. It is for this reason that they are placed even on machine guns and equipment standing in open areas.

Infrared

These types of screens have a kind of infrared panel in the form of a grid consisting of vertically and horizontally located rays that react to any touch on the screen (with any object).

With the help of an embedded controller, the point where the touch was made is recorded in order to implement a particular program.

Such screens are often used where there is not a lot of dust, dirt, or debris - e-readers, sensors in military structures, Neonode brand phones.

Optical

The glass panel has infrared illumination, which on the line between the glass and the air mass can produce 100% reflection inside, and light scattering occurs between the glass panel and your finger, the object. A small matter is to create this scattering picture. Scientists were able to create several technologies to make this progress:

1 A camera is installed on the screen next to the projector.

2 Using the auxiliary fourth sub-pixel of the LCD screen, produce a light-sensing process.

3 While working with this screen, The lights inside are able to distinguish between touching human skin and a foreign object. Thanks to this development, it was decided to expand the boundaries of the size of such touch surfaces (from minimal screens to large school boards).

Dispersive Signal Technology

This type captures the piezoelectric phenomenon in a glass panel. It is possible to touch either with your hand or with any object. Can function in any dusty environment without leaving your finger idle.

Wave bright screens (Surface acoustic wave)

These types of screens can be safely called our bright, beautiful, unique future!

Coordinate points of touch on the screen (X and Y) contribute to the launch of a certain, previously programmed algorithm of actions. At the ends of each of the axes there are converters, and each of them has its own principles of influence: one of them transmits information, and the second receives it. In addition to them, there are reflectors on the glass panel that reflect the electrical signal that passes from one converter to another.

Transducers in the form of receivers are quite smart mechanisms that can “feel” whether a tap on the screen occurred, and in which exact coordinates it happened (guarantees long-term use and accurate data entry). The glass panel in this type of screen is completely devoid of metal coating, which is one of the main advantages - a person will see all the colors of the image, without distortion, as well as all the beauty of these colors!

For those, who works on your touchscreen device, and their work is related to small signs, details, graphs, tables, then for them the wave screen is simply excellent option for purchasing. After all, if we take the above types of screens as an example, this or that number or value will not be so clearly visible on them, but on a wave screen, even when zoomed in, you will be able to see even the smallest detail in all its beauty and clarity. In other types of touchscreens, in 80% there is incomplete image distortion, and all this is directly related to light delay.

Induction

This type of touchscreen is intended only for a special pen (a pen for performing any action on the touch screen, often sold together with a tablet or pocket PC).

Some distinctive features of these types of screens

1 Some of the cheapest touch screens are resistive. They convey brightness and clarity least clearly to human vision, and are the most vulnerable of all. Even the most awkward movement can damage it.

2 If we take the most expensive touchscreens, then these are wave ones. They are the brightest, most comfortable, accurate, beautiful.

3 Resistive screens- these are already relics of the past, but wave and capacitive ones are a strong present and a bright future!

4 When using a resistive screen, It doesn't matter too much what you touch him with.- pen, card, finger.

5 And here capacitive screens, on the contrary, strictly know how to work with them- only objects that conduct current through themselves. In 80% of cases it’s your fingers.

6 The wave screen is still in terms of use and pressing will be equivalent to a resistive screen.

Functionality table

	Matr	4prov	5 wire		Project	IR - mesh	Wholesale		DST	Induct
Functionality
Glove	+	+	+		-	+	+		+	-
The wire. Item	+	+	+		+	+	+		+	+
Non-wired item	+	+	+		-	+	+		+	-
Sensing body heat from pen	-	-	-		+	-	+		-	-
Long touch	+	-	+		+	+	+		-	-
Setting the touch force	-	-	-		+	-	+		-	+
Glass transparency	85	75	85		90	100	95			90
Pressing accuracy	-	+	+		+	-	+		+	+
Reliability in use
Implementation period	35	10	25	∞		∞	∞	∞		∞
Protective reactions to dust, moisture	+	+	+	+		-	+	+		+
Resistant to impacts, burglaries and scratches	-	-	-	+		-	+	-		-
usage	Ogre	Ogre	Ogre	Street		Placed	Placed	Placed		OGR

Calibration

Since no type of touch screen can give you a guarantee of its durability, The sensor may malfunction:

• errors when pressing;
• non-response to your touch on the screen;
• incorrect response to pressing a particular function (instead of Menu, you come into Gallery and vice versa, etc.).

If there are such discrepancies in the operation of the screen, or when replacing the sensor, many technicians will offer touchscreen calibration. This kind of manipulation is not particularly complicated, but the correct operation of the screen response will depend on them.

– this is a set of techniques for improving the performance of the screen’s response to your touch, or using special pens and pens. To find out whether your device requires calibration, you should (if it has one) thoroughly wipe the screen.

Then find any bookmarks, SMS, documents on your device, and when the keyboard lights up, press any of the letters. In the event that the letter you press does not correspond to the one you wanted to see on the screen, you will need to calibrate the screen. Each type will require its own calibration:

Resistive. This type of screen, when turned on for the first time, must undergo screen calibration. For this purpose, there is a programmed activation, and you cannot avoid this procedure in any way. It is also advisable to carry out calibration if the resistive screen has been hit or fallen, it will be replaced with a new one due to a software failure. Almost every device with this type of screen has a built-in program - ts_calibrate, which is located in the phone settings, in the Calibration sub-item. After selecting this program, your screen will darken, and a dot, cross, sign, of any color will appear in the center and you will need to click on it to begin the screen calibration process. You should be careful when pressing, and after correctly entering 4-6 times at a given point, the device will save all the correct data, and the phone, tablet, PDA will work properly and accurately.

Capacitive. This type of screen has failures, but much less often than the one described above. The capacitive screen does not already have a built-in program for this procedure, but you can download it without any problems and completely free of charge - TouchScreen Tune. With the help of this program, even the most inexperienced person can carry out the entire cycle of procedures without any problems.

Something to remember! Resistive screens must be calibrated once every 30-35 days, especially if the screen is constantly used. When calibrating on a capacitive screen, you should be careful, since if the procedure is carried out incorrectly, the touchscreen may completely fail and return to the initial settings.

This only means that if you are not confident in your abilities, then it is better to entrust this nuance to specialists in this matter!

Is it possible to replace

In the event that it requires replacement:

• Broken;
• Broken;
• Cracked;
• Has stopped functioning (does not respond, does not turn on, etc.),

It is not advisable to carry out independent actions, and just as suggested above, contact specialists who can help you in any situation. We strongly recommend that touchscreen replacements be carried out only in service centers, where a quality guarantee will be provided for any work.

Every person constantly encounters a touchscreen when making calls on a smartphone or withdrawing money from an ATM. Let's take a closer look at the operating features of this device.

What is touchscreen, where is the technology used?

A touchscreen is a touch screen with which the user can give commands to the device by touching it. This technology has made it possible to abandon push-button phones; now to control a mobile device you need to interact with the screen - this is convenient and practical.

The name “touchscreen” comes from two English words – touch (touch) and screen (screen). Touch screen devices are ubiquitous, and these are not only mobile phones, but also:

• tablets;
• ATMs;
• information terminals at airports and train stations;
• household appliances, etc.

Although the touchscreen has become widespread in smartphones. Regardless of the device in which the technology is used, the operating principle is always the same - you issue commands by touching the desired elements on the screen. Then the algorithm of a specific program comes into play.

The basis of any touchscreen is a liquid crystal matrix. On the back side there are diodes (they act as a backlight), on the front side there are several layers that record pressing (in resistive screens) or touch (in capacitive taps).

Resistive touchscreen is an outdated technology

There are several systems used to create touch screens. The most common are resistive and capacitive technologies, which have significant differences. You can find out more about what a touchscreen is; the website describes different systems, indicating their pros and cons.

Old smartphones had resistive screens that required the use of styluses (small pointers with which the user gave commands to the phone). The resistive system is glass coated with an elastic film and a layer that conducts electricity.

There is empty space between these two elements. The display surface is protected by a special coating that protects the screen from scratches and other mechanical damage. But for better protection, a film is provided (it came with old smartphones).

Resistive touchscreens have a number of disadvantages:

• the need to press on the screen (touching is more convenient);
• screen calibration resulting from redistribution of the mass of the insulating layer;
• rapid deterioration in the quality of the touchscreen (appearance of cracks, scratches, stains, etc.);
• short service life, which is explained precisely by the rapid appearance of damage;
• lack of sliding ability (as on modern smartphones), etc.

Today, resistive touchscreens are becoming increasingly rare. Smartphone manufacturers have abandoned them; now they are mainly used in ATMs and various terminals.

Capacitive touchscreen is the most popular system

This technology involves the use of glass with a conductive layer. Touching the display releases an electrical charge (at the location touched). Microcircuits record every touch on the display, transmitting this information to the touchscreen program.

Advantages of capacitive touchscreens:

• long service life and resistance to dirt;
• high level of transparency (at least 90%);
• better response to impact, reliability;
• excellent brightness (the picture looks clearer);
• moisture resistance, MultiTouch support.

Most often, smartphones use touch screens with protective tempered glass Gorilla Glass; it withstands light mechanical impacts, including scratches. Capacitive touchscreens began to replace their resistive counterparts in 2009.

But technology is improving, there is no doubt that in the future smartphones will be equipped with even more responsive, practical and durable displays.