Capacitive versus resistive. Capacitive or resistive screen for secure gadgets

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Resistive or capacitive screen? Resistive! October 26th, 2014

What is the difference between the capacitive screens used in the iPhone and other modern mobile devices ah, from other types of touch displays? And is this the future?

You need to choose a RESISTIVE SCREEN!

Review and explanation

I have been convinced many times that regular users absolutely do not suspect the existence different types touch screens and learn with genuine amazement that the lack of response of the display of a newly purchased communicator to the usual poking with a pencil is not at all a sign of a malfunction. It's just a different screen, built on a different technology. Even some sellers are confused in the readings, attributing to displays of one type the properties of others. So first we will conduct brief educational program, after which you will be able to distinguish different types of screens literally by touch. And then we’ll talk about which of them is the future.

Modern mobile devices - smartphones, communicators, players - use two types of touch screens: resistive and capacitive. Moreover, more than 90% of all touch screens today are of the resistive type, although there is already a clear trend toward an increase in the share of capacitive screens.

To stop getting confused, just remember: resistive screens are pressure sensitive, while capacitive screens are touch sensitive. This difference is due to the design of the displays, and it is in principle impossible to train, for example, a capacitive screen to recognize pencil presses.

A resistive screen is a glass liquid crystal display on which a flexible membrane is applied. A resistive composition is applied to the contacting sides, and the space between the planes is divided by a dielectric. Electrodes (four or eight, five or six and seven) are attached to the edges of the plates. It is easy to guess that when pressed, the screen and the membrane come into contact at the point of pressing, the coordinates of which are calculated by sequentially applying current to the upper and lower plates and measuring the voltage at the point of contact of the plates. That is why you can press such a screen with any hard object - from a fingernail and a stylus to a pencil or a match, and it will work.

Operating principle of a five-wire resistive screen

Due to their design, resistive screens and, especially, their conductive layer are subject to gradual wear, which is why there is a need for periodic calibration of the screen. The simplest and cheapest four-electrode screens can withstand only 3 million clicks on one point. Several times more reliable - up to 35 million clicks - are five-wire ones, where four electrodes are located on the screen plate, and the fifth is on a membrane coated with a conductive composition and serves only as a kind of “probe”. In addition, five-wire and its modifications 6 and 7-wire screens continue to work even if part of the membrane is damaged.

The disadvantages of resistive screens also include low light transmission - no more than 70-85%, which requires increased backlight brightness. But these screens are extremely cheap to produce, which explains their wide distribution.

Capacitive touch screen In general, it is a glass panel on which a layer of transparent resistive material is applied. Electrodes are installed at the corners of the panel, supplying low-voltage power to the conductive layer. AC voltage. Since the human body is capable of conducting electricity and has some capacity, when you touch the screen, a leak appears in the system. The location of this leak, that is, the point of contact, is determined by a simple controller based on data from the electrodes at the corners of the panel.

Operating principle of a capacitive screen

There are no flexible membranes on the screen, which ensures high reliability and allows you to reduce the brightness of the backlight. Unfortunately, you cannot poke them with a stylus or fingernail, since the command simply will not be recognized. Only with your finger. Such a screen also does not like negative temperatures: at best, the accuracy of determining coordinates decreases; at worst, it simply stops responding.

Operating principle of a projected capacitive screen

Unfortunately, on the simplest capacitive screen, which is now installed in the cheapest “touch” phones, it is impossible to organize a fashionable “multi-finger” multi-touch interface - four electrodes in the corners are capable of recording only one click at a time. Projected capacitive displays, in which reverse side the screen has a whole grid of conductors (or rows of electrodes), to which a weak current is applied, and the place of contact is determined by the points with increased capacity. By the way, such screens are capable of reacting even to the approach of a hand (and therefore to a gloved hand) - it all depends on the sensitivity settings.

Many experts, not without reason, believe that resistive screens are a thing of the past, and capacitive screens are the future. Indeed, just the transition from a mechanical-electrical input system to a purely electrical one is certainly progress. Reliability and accuracy of coordinate determination have increased, the need for calibration has disappeared, and a “multi-finger” interface has appeared.

The abandonment of resistive displays stimulated the development of truly convenient user interfaces, optimized for finger control. In modern communicators, you no longer need to aim a sliver at microscopic interface elements inherited from the “big ones” operating systems. Note, latest Windows Phone 7 is absolutely nothing like the rest of the family of “mobile windows” of previous generations, in which there was nothing to do without a tiny stylus.

Skeptics will note that you can no longer draw on a capacitive screen with a regular plastic stylus or some random object, or write down a memo by hand. To do this, you will have to buy a special stylus with an electrical capacity. HTC even patented such a capacitive stylus (http://www.devicewire.co.uk/official-htc-hd2-capacitive-stylus) and asks about $30 for it. But how often do we draw on our phones or use handwriting? As they say in certain circles, a little less often than never. But touch tablets for drawing use completely different technologies, and they are not going anywhere.

The only reason why resistive screens still occupy the lion's share of the market is because they are extremely cheap. In addition, over the course of several years, all the largest vendors managed to produce such a number of very diverse and not at all cheap handsets with resistive displays that it would be like death for them to immediately write them into the category of obsolete. In any case, there will be more and more devices with capacitive screens, and fewer and fewer devices with resistive screens. In a few years, we won’t even remember that we once poked special thin slivers into the screen of smartphones.

ANALYSIS AND CONCLUSION

Analyzing the operating principle of the two different screens, we can conclude that in resistive the screen has no effect on the human body electromagnetic radiation and indirectly by electric shock. Conversely, the screen capacitive this is practically an electromagnetic field into which you immerse your hand to perform certain actions. Moreover, this electromagnetic field begins to be physically felt already from a distance of 5-10 cm from the screen.

Do not forget that blood in the human body is carried by hemoglobin, which contains iron. Using capacitive screen, you actually conduct electromagnetic treatment of your blood, which then distributes these results throughout the body.

A rheumatist, as a person most sensitive to effects on the cardiovascular system, will immediately answer: “After five minutes from the capacitive screen, my hand hurts and my bones ache! Throw away this shit immediately! Don’t give it to children!”

If you work a lot and often with touch screens, then always choose a resistive one. In principle, children should not be given access to capacitive screens. We don't need multitouch if such crap accompanies its use. Improve resistive screens to multi-touch and don’t come to us with capacitive screens.

Analysis and conclusion: Judicial technical expertise institutions of CNEAT Samara:

If you are not one of those savvy technically users and you will soon be faced with a question of choice mobile phone or a smartphone with a touch screen, you are likely to come across terms such as “capacitive screen” or “ resistive screen" And then it will come to your mind completely logical question– which one is better: resistive or capacitive? Let's find out the differences touch displays, what types of them exist and what are their advantages and disadvantages.

RESISTIVE SCREENS

If we talk accessible language, avoiding wise technical terms and phrases, a resistive touch screen is a flexible transparent membrane on which a conductive (in other words, resistive) coating is applied. Under the membrane there is glass, also covered with a conductive layer. The principle of operation of a resistive screen is that when you press the screen with a finger or stylus, the glass shorts...

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Touch screens on devices are divided into two main types, which have significant differences.

Resistive touch screen.

This screen consists of several layers. When you press the screen, a short circuit occurs with the membrane. The gadget registers this change, converts it into coordinates, by which it determines where exactly you clicked, and reacts to the click accordingly. For example, opens a program or selects a specific menu.

High strength. Such screens are made from various types of fiberglass. Low cost. The resistive screen has a simple operating principle.

The disadvantage is low sensitivity. Simple finger touches are often not recognized by the device, so you will have to use a stylus or long nails.

Capacitive touch screen.

This screen consists of a layer of glass covered electrical conductor. The human body is a good conductor of electricity, so when you touch the screen...

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Before considering a capacitive or resistive screen, you need to decide what touch technology is in general. Everything is clear here: this is the screen that determines the coordinates of the press. In scientific terms, this refers to a method of controlling the interface with which the user can click directly on the place of interest. On this moment There are several methods for implementing touch screens. It is worth considering each separately.

Resistive technology

To decide which type of screen, capacitive or resistive, is best for you, you need to consider them. The second option involves using a certain production technology. At the bottom there is a glass panel, on top of which there is a transparent flexible membrane. There is a conductive coating on the panel and membrane, that is, resistive. When you press the screen, a short circuit occurs at a certain point. If you know the voltage on...

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Can be found a large number of touch displays, differing not only design features, but also the principle of operation. Today, there are the following types of touch screens: resistive, capacitive, projection-capacitive, matrix, surface acoustic wave touch screen, infrared, strain gauge, inductive.

IN currently V electronic technology There are two main types of touch screens used: resistive and capacitive. We will talk about them in more detail, and also try to highlight the strong and weak sides everyone.

Resistive touch screen

First, let's look at the operating principle of a resistive touch screen. It consists of a glass panel and a flexible plastic membrane, on which a resistive coating is applied. The space between the glass and the membrane is filled with micro-insulators, which in turn reliably insulate the conductive surfaces, evenly distributed over the active area of the screen. When you click on...

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Capacitive vs resistive ArchivesMobilis

How do capacitive screens used in the iPhone and other modern mobile devices differ from other types of touch displays? And is this the future?

I have repeatedly been convinced that ordinary users are completely unaware of the existence of different types of touch screens and are truly surprised to learn that the lack of response of the display of a freshly purchased communicator to the usual poking with a pencil is not at all a sign of a malfunction. It's just a different screen, built on a different technology. Even some sellers are confused in the readings, attributing to displays of one type the properties of others. So first we will conduct a brief educational program, after which you will be able to distinguish different types of screens literally by touch. And then we’ll talk about which of them is the future.

Modern mobile devices - smartphones, communicators, players - use...

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Often, when choosing an Internet tablet, a person reads a lot of reviews and reviews and simply drowns in new, unfamiliar terms and concepts. So, for example, not everyone knows what a resistive screen is. There is hardly any need to prove that the display is the most important part tablet PC (and any other mobile device), so let’s understand this concept.

What is a resistive screen?

The answer can be very short:

A resistive touch screen is a display made of the same technology. This provides its special properties compared to another common type of screen - capacitive.

Now let’s figure it out in detail, what kind of technology this is and what it means for the end user (tablet buyer).

Resistive display manufacturing technology

If in general outline, then the problem of turning a stylus or fingernail into something like computer mouse is achieved as follows.

The sensor consists of two (usually) layers: glass and...

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Resistive or capacitive touch screen

Working principle of resistive touch screen

A resistive touch screen is like a sandwich consisting of layers, if we speak in analogies. When you press the screen, it closes with the membrane, the device registers the change in resistance and converts it into coordinates, so your tablet knows that you pressed here and reacts accordingly. For example, opens an application or pauses the game. Their strengths the fact that they are quite durable, as they are made from various types of fiberglass. Considering that this is enough simple development, the resistive screen also has a relatively low cost, so the resistive touch screen...

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A touch screen is an information input device based on the coordinate sensing principle that responds to touch. They usually become an alternative a whole bunch mechanical buttons, which is very convenient, as it allows you to combine the display and input device. Reliability of operation similar system much higher due to the fact that there are no mechanical or moving parts.

The very first models of touch screens were created back in the late sixties of the last century, it was then that the scientist Samuel Hurst realized that he did not want to read kilometers of recorder tapes. In 1971, he founded the Elotouch company, which released the eliograph, which was the first computing device to have a resistive touch screen. After some time, his company merged with another called Siemens, after which it became known as Elographics. Thanks to this collaboration, touch panels for picture tubes were developed...

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Display: capacitive or resistive, which is better? When choosing touch smartphone The question may arise, which touchphone is better: with a resistive or capacitive screen? Let's say right away that none of these technologies is qualitatively superior to the other; both of them have their pros and cons. So the user should compare all the advantages and disadvantages and choose the lesser of two evils =)
In this article, we will talk about the advantages and disadvantages of capacitive and resistive screens.
Features of resistive type screen:
The resistive touch screen is characterized by a relatively low cost and maximum resistance to contamination. The resistive screen responds to touch with any hard, smooth object: a hand (including a gloved one), a stylus, credit card, pen, while in some phones touches are accompanied by a response, vibration feedback, which makes work more comfortable and enjoyable. Plus, resistive technology allows the use...

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Your phone's touchscreen: resistive, capacitive or projected capacitive

Touch screens today are an integral attribute of a modern mobile phone, although they became widespread relatively recently - in 2007. And if you are planning to buy a smartphone, you are unlikely to find among the new models those that are not equipped with a touch screen. Despite the fact that adherents of conventional hardware keyboards have difficulty switching to touch control, sensory devices are being produced more and more. And for those who value convenient typing, they release touch phones in a classic form factor or in a side slider form factor, which are additionally equipped with hardware QWERTY keyboards.

Touch phones and smartphones in different form factors

Often the phrase “touch screen” is replaced by another - “touchscreen”, which is a combination of two English words (touch - touch, touch and screen -...

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Tablets, or as they are also called - tablets, based on the operating room Android systems are some of the fairly new gadgets that will allow you to chat with your friends, view World Wide Web (Internet), as well as watch movies and listen to your favorite music. They are usually small flat shape, have lost a significant part of their mass and a rather voluminous keyboard, which is now associated with their older brother, the laptop. If there is no keyboard, you ask, then how to work with them?

Every tablet has a touch screen. It's a screen that responds to your touch, just like a laptop's touchpad. This way, instead of clicking on icons with your mouse, you can simply touch them with your finger or stylus (looks like a pen, but without the ink).

Exist different kinds touch displays, so let's figure out what they are and what the differences are between them:

Resistive touch screen

Resistive...

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Hello dear readers. Because I’m already tired of the fact that various unscrupulous (and more often simply ignorant) journalists are constantly speculating on the topic of touch screens, I decided to introduce a small educational program on the concepts of resistive touch screen, capacitive touch screen and multitouch. After reading this article, you will understand why the presence of a capacitive touch screen does not mean multi-touch, and also why the iPhone has real multi-touch, while others have only a crooked attempt to imitate it. I warn you in advance that the article was not paid for by anyone, and the power structures of the Russian Federation have nothing to do with its appearance at all.

So, first, let's define what a touch screen is. Everything is simple here: this is a screen that tracks the coordinates of the press. Or, more scientifically, it is a method of controlling an interface that allows the user to tap directly on the screen. In short, it’s a no brainer what it is. There are several methods for implementing a touch screen. About...

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Screens modern devices can not only display an image, but also allow you to interact with the device via sensors. Initially, touch screens were used in some pocket computers, and today touch screens are widely used in mobile devices, players, photo and video cameras, information kiosks, etc. Moreover, each of the listed devices can use one or another type of touch screen. Currently, several types have been developed touch panels, and accordingly, each of them has its own advantages and disadvantages. In this article we will look at what types of touch screens there are, their advantages and disadvantages, as well as which type of touch screen is better.

There are four main types of touchscreens: resistive, capacitive, surface acoustic wave, and infrared. In mobile devices, only two are most widespread: resistive and capacitive....

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With the era of the advent of touch screens, people who buy a Chinese mobile phone often do not suspect that there are different types, and if the sensor on your phone does not work well, this does not mean that your mobile phone is broken, but perhaps simply that this phone has a different one. a type of screen you're not yet used to.

And now we will help you sort out this confusion. There are two types of touch screens in Chinese phones These are: resistive screen and capacitive screen. Next we will talk in more detail about each of them. Then you will be able to distinguish these screens from the first touch.

So that you stop getting confused, I suggest you remember simple truth in these screens, resistive screens are pressure sensitive, and capacitive screens are touch sensitive. They have a completely different display design, and it is basically impossible to accustom, for example, a Chinese mobile phone with a capacitive screen to a stylus or to a nail.

The resistive screen is a glass...

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Nowadays, touch screens have long ceased to be exotic. They all look similar on the outside, but are these displays actually the same? Let's look at the design of the main types of sensitive screens, their advantages, disadvantages and scope of application.

Today, the most widely used sensors are those based on capacitive and resistive technologies, as well as their varieties.

"Multi-touch"

This is the name of the technology that allows you to recognize touch screen presses at several points simultaneously. This opens up new possibilities in device management. An example of the use of multi-touch technology is the interface Apple iPhone.

Capacitive touch screens

Touch display operating on capacitive principle, actually responds to touch. It consists of a glass panel coated with a transparent conductive compound. At the corners of the panel there are four electrodes to which alternating current is supplied....

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A touch screen is a device for input and output of information through a touch- and gesture-sensitive display. As you know, the screens of modern devices not only display images, but also allow you to interact with the device. Initially, familiar buttons were used for such interaction, then the equally famous “mouse” manipulator appeared, which significantly simplified the manipulation of information on the computer display. However, the “mouse” requires a horizontal surface to work and is not very suitable for mobile devices. This is where an addition to the regular screen comes to the rescue - Touch Screen, which is also known as Touch Panel, touch panel, touch film. That is, in fact, the touch element is not a screen - it is additional device, installed on top of the display from the outside, protecting it and serving to enter the coordinates of touching the screen with a finger or other object.

Usage

Today touch screens...

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The first appearance of touch screens occurred in the era of handhelds of yesteryear - PDAs or, in English, PDAs. The gadgets were interesting, but absurdly low-functional, and therefore did not catch on, unlike touchscreens.

Moreover, the latter not only stood the test of time, but also became the cornerstone of the concept of all modern mobile gadgets. It’s almost impossible for us to imagine something non-stationary and with a QWERTY keyboard, but for last years touch displays have “learned” to be truly responsive and easy to use. Although their designs have hardly changed in principle and are divided into the same 3 main categories.

Resistive systems

Imagine a conductor in the form of a thin and flexible metal plate, and opposite it is a glass panel coated with conductive paint. If you press something on the metal plate, it will bend and touch the coating on the glass. And since electric currents are constantly running across both surfaces...

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How do capacitive screens used in the iPhone and other modern mobile devices differ from other types of touch displays? And is this the future?

Operating principle of a five-wire resistive screen

A capacitive touch screen is generally a glass panel on which a layer of transparent resistive material is applied. Electrodes are installed at the corners of the panel, supplying low-voltage alternating voltage to the conductive layer. Since the human body is capable of conducting electrical current and has some capacitance, when touching the screen, a leak appears in the system. The location of this leak, that is, the point of contact, is determined by a simple controller based on data from the electrodes at the corners of the panel.

Operating principle of a capacitive screen

Operating principle of a projected capacitive screen

Unfortunately, on the simplest capacitive screen, which is now installed in the cheapest “touch” phones, it is impossible to organize a fashionable “multi-finger” multi-touch interface - four electrodes in the corners are capable of recording only one click at a time. Projected-capacitive displays are free from this drawback, in which a whole grid of conductors (or rows of electrodes) is applied to the back of the screen, to which a weak current is supplied, and the point of contact is determined by points with increased capacitance. By the way, such screens are capable of reacting even to the approach of a hand (and therefore to a gloved hand) - it all depends on the sensitivity settings.

The move away from resistive displays has spurred the development of truly seamless user interfaces optimized for finger control. In modern communicators, you no longer need to aim a sliver at microscopic interface elements inherited from “large” operating systems. Please note, the latest Windows Phone 7 is absolutely nothing like the rest of the family of “mobile windows” of previous generations, in which there was nothing to do without a tiny stylus.

Illustrations: all diagrams are published under license Creative Commons Attribution-Share Alike 3.0 Unported by Mercury13.

The screens of modern devices can not only display images, but also allow you to interact with the device through sensors.

Initially, touch screens were used in some pocket computers, and today touch screens are widely used in mobile devices, players, photo and video cameras, information kiosks, and so on. Moreover, each of the listed devices can use one or another type of touch screen. Currently, several types of touch panels have been developed, and, accordingly, each of them has its own advantages and disadvantages. In this article we will look at what types of touch screens there are, their advantages and disadvantages, and which type of touch screen is better.

There are four main types of touch screens: resistive, capacitive, with the detection of surface acoustic waves and infrared . In mobile devices, only two are most widespread: resistive and capacitive . Their main difference is the fact that resistive screens recognize pressure, while capacitive screens recognize touch.

Resistive touch screens

This technology is most widespread among mobile devices, which is explained by the simplicity of the technology and low production costs. The resistive screen is LCD display, on which two transparent plates are superimposed, separated by a dielectric layer. The top plate is flexible, as the user presses on it, while the bottom plate is rigidly fixed to the screen. Conductors are applied to surfaces facing each other.

Resistive touch screen

The microcontroller supplies voltage in series to the electrodes of the top and bottom plates. When the screen is pressed, the flexible top layer flexes and its inner conductive surface touches the lower conductive layer, thereby changing the resistance of the entire system. The change in resistance is recorded by the microcontroller and thus the coordinates of the touch point are determined.

The advantages of resistive screens include simplicity and low cost, good sensitivity, and the ability to press the screen with either a finger or any object. Among the disadvantages, it is necessary to note poor light transmission (as a result, you have to use a brighter backlight), poor support for multiple clicks (multi-touch), they cannot determine the force of pressing, as well as fairly rapid mechanical wear, although in comparison with the life of the phone, this disadvantage is not so important, as usual faster phone fails than the touch screen.

Application: Cell Phones, PDAs, smartphones, communicators, POS terminals, TabletPC, medical equipment.

Capacitive touch screens

Capacitive touch screens are divided into two types: surface-capacitive and projected-capacitive . Surface capacitive touch screens are glass on the surface of which a thin transparent conductive coating is applied, on top of which protective covering. Along the edges of the glass there are printed electrodes that apply low-voltage alternating voltage to the conductive coating.

Surface capacitive touch screen

When you touch the screen, a current pulse is generated at the point of contact, the magnitude of which is proportional to the distance from each corner of the screen to the point of contact, thus, it is quite simple for the controller to calculate the coordinates of the point of contact and compare these currents. The advantages of surface capacitive screens include: good light transmission, short response time and long touch life. Among the disadvantages: the electrodes placed on the sides are not suitable for mobile devices, they are demanding on external temperature, they do not support multi-touch, you can touch them with your fingers or a special stylus, and they cannot determine the pressing force.

Application: Information kiosks in secure areas, at some ATMs.

Projected capacitive touch screens They are glass with horizontal leading lines of conductive material and vertical defining lines of conductive material applied to it, separated by a layer of dielectric.

Projected capacitive touch screen

Such a screen works as follows: a microcontroller sequentially applies voltage to each of the electrodes in the conductive material and measures the amplitude of the resulting current pulse. As the finger approaches the screen, the capacitance of the electrodes located under the finger changes, and thus the controller determines the location of the touch, that is, the coordinates of the touch are intersecting electrodes with increased capacitance.

The advantage of projected capacitive touch screens is fast speed touch response, multi-touch support, more accurate coordinate determination compared to resistive screens, and pressure detection. Therefore, these screens are used to a greater extent in devices such as the iPhone and iPad. It is also worth noting the greater reliability of these screens and, as a result, a longer service life. Among the disadvantages, it can be noted that on such screens you can only touch with your fingers (drawing or writing by hand with your fingers is very inconvenient) or with a special stylus.

Application: payment terminals, ATMs, electronic kiosks on the streets, touchpads of laptops, iPhone, iPad, communicators and so on.

SAW touch screens (surface acoustic waves)

The composition and operating principle of this type of screen is as follows: piezoelectric elements are placed at the corners of the screen, which convert the electrical signal supplied to them into ultrasonic waves and direct these waves along the surface of the screen. Reflectors are distributed along the edges of one side of the screen, which distribute ultrasonic waves across the entire screen. On the opposite edges of the screen from the reflectors there are sensors that focus ultrasonic waves and transmit them further to the transducer, which in turn converts the ultrasonic wave back into an electrical signal. Thus, for the controller, the screen is represented as a digital matrix, each value of which corresponds to a specific point on the screen surface. When a finger touches the screen at any point, waves are absorbed, and as a result, the overall pattern of propagation of ultrasonic waves changes and as a result, the transducer produces a weaker electrical signal, which is compared with the digital matrix of the screen stored in memory, and thus the coordinates of touching the screen are calculated.

SAW touch screen

The advantages include high transparency, since the screen does not contain conductive surfaces, durability (up to 50 million touches), and surfactant touch screens allow you to determine not only the coordinates of pressing, but also the pressing force.

Among the disadvantages, we can note the lower accuracy of determining coordinates than capacitive ones, that is, you won’t be able to draw on such screens. A big disadvantage is malfunctions when exposed to acoustic noise, vibrations or when the screen is dirty, i.e. Any dirt on the screen will block its operation. Also, these screens only work correctly with objects that absorb acoustic waves.

Application: surfactant touch screens mainly in secured information kiosks, in educational institutions, V slot machines and so on.

Infrared touch screens

The design and operating principle of infrared touch screens is quite simple. Along two adjacent sides of the touch screen there are LEDs that emit infrared rays. And on the opposite side of the screen there are phototransistors that receive infrared rays. Thus, the entire screen is covered with an invisible grid of intersecting infrared rays, and if you touch the screen with your finger, the rays overlap and do not hit the phototransistors, which is immediately registered by the controller, and thus the coordinates of the touch are determined.

Infrared touch screen

Application: Infrared touch screens are mainly used in information kiosks, vending machines, medical equipment, etc.

Among the advantages we can note the high transparency of the screen, durability, simplicity and maintainability of the circuit. Among the disadvantages: they are afraid of dirt (therefore they are used only indoors), cannot determine the force of pressing, average accuracy in determining coordinates.

P.S. So, we looked at the main types of the most common touch technologies(although there are also less common ones, such as optical, strain gauge, induction, and so on). Of all these technologies, resistive and capacitive ones are most widely used in mobile devices, as they have high accuracy in determining the point of contact. Of them best characteristics have projected capacitive touch screens.

The text was prepared based on materials from open sources Methodists in Technology Karabin A.S., L.V. Gavrik, S.V. Usachev

If you are not one of the tech-savvy users and you will soon be faced with the question of choosing a mobile phone or smartphone with a touch screen, you will probably come across terms such as “capacitive screen” or “resistive screen” when reading the specifications of mobile devices. And then a completely logical question will come to your mind - which one is better: resistive or capacitive? Let's find out how touch displays differ, what types exist, and what their advantages and disadvantages are.

RESISTIVE SCREENS

To put it in simple language, avoiding clever technical terms and phrases, a resistive touch screen is a flexible transparent membrane on which a conductive (in other words, resistive) coating is applied. Under the membrane there is glass, also covered with a conductive layer. The principle of operation of a resistive screen is that when you press the screen with a finger or stylus, the glass closes with the membrane at a specific point. The microprocessor records the change in membrane voltage and calculates the contact coordinates. The more precise the press, the easier it is for the processor to calculate the exact coordinates. Therefore, with resistive screens it is much easier to work with a stylus.

The main advantages of resistive screens are that they are relatively cheap to produce, and also that this type The display responds to pressing by any objects. This is very useful when making presentations, especially since the prices of projectors today are falling every day.

The disadvantages of resistive screens are: low strength; low durability (about 35 million clicks per point); impossibility of implementation; big number errors when processing gestures such as sliding and flipping.

So which screen is better: resistive or capacitive?

If you read carefully this article, then you can draw your own conclusion without any problems. I will only say that this dispute is doomed to failure. Some users like to work with a stylus and are not comfortable with capacitive displays. But most people are more comfortable operating a device equipped with capacitive screen– it’s more convenient, and the possibility of multi-touch decides a lot. It's not all for nothing modern smartphones and tablets running under Android control, have capacitive displays.

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Capacitive versus resistive. Capacitive or resistive screen for secure gadgets

Resistive technology

Resistive touch screen

What is a resistive screen?

Resistive display manufacturing technology

Resistive touch screen

"Multi-touch"

Capacitive touch screens

Usage

Resistive systems

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