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What is a capacitive touch screen?

The touch screen has become one of the promoters of this new connected society in which we all use our smartphone, tablet or any other similar device daily. And it is that, without them, it would be really complicated that the so complex operating systems of our mobiles had been developed. However, as with almost any object that becomes daily in our life, we lose the sense of its operation. It becomes so obvious that we don’t even ask ourselves what is the technology behind it. A Capacitive Touch Screens is a type of capacitive sensor that is made up of an electrical insulation layer and that is covered with a transparent conductor. Since the human body is an electrical conductor, when contact is made with the surface of said screen, a distortion of its electromagnetic field is generated. This field is measured thanks to the change in capacitance, also called electrical capacity. Different technologies can be used for this. The position must be sent to the controller for processing. In addition, these types of screens allow to obtain a higher quality image, with an improved response and, in some cases, the use of several fingers at the same time is allowed. However, these are more expensive displays and should not be used with a common type pointer, but will require a specific pointer for a capacitive display. A touch screen is something like an invisible keyboard attached to the front of a monitor. To understand how Capacitive Touch Screens work, it is first vital to know how an ordinary keyboard works, where basically each key is an electrical switch. When one of them is pressed, a circuit is completed and a current flows, which varies depending on the key that is pressed and this is how the team realizes what we are writing Touchscreens try to achieve something similar to normal keyboards but obviously cannot use switches, plastic membranes and other materials, since otherwise they would obstruct the visibility of what is shown on the screen, so they must use clever tricks to detect touch completely invisible.

How Capacitive Touch Screens Works?

Touchscreens work in different ways. Some can only detect one finger at a time and become too confused if two different places are pressed at the same time, while others can with this action. The arrival of touchscreens in our lives brought “swear words” like “resistive screen” or “capacitive screen” that in the end many people cannot distinguish. Touchscreen devices have a two-dimensional detection system that is made of 2 sheets of material and dividers to separate these sheets. Humans are good drivers of this technology, so using your fingers to close an electrical circuit will make it extremely simple to accurately detect human contact. Touchscreens have 3 vital components: a touch sensor, a touch controller, and a software controller. The screen itself is an input device, and the touch input system can be completed by combining it with a monitor or PC.

Touch sensor
A touch sensor is a transparent glass panel on which the touch surface is highly sensitive. Each sensor would use a different method to detect the input. This touch panel is placed on top of a display screen so that the display area of the video screen is covered by the sensitive area of the panel. There are numerous touch sensor technologies on the market, each of which uses different methods to detect touch input. This sensor will also have an electrical signal going through it and touches the screen to cause a signal or voltage change. This signal change is used to discover the location of the touch on the screen.

Touch controller
The touch controller is a PC card that is connected between the PC and the touch sensor. It is usually installed inside the touch monitor to integrate monitors. The controller translates the information from the touch sensor into information that the PC can understand. The driver will determine the type of connection the PC needs. There are built-in touch monitors that have a cable connection on the back of the screen. Other specialized drivers in Capacitive Touch Screens are available and will work on DVD players and other devices.

Software driver
This driver will provide a software update for the PC system that would allow the touch screen and PC to work together. This determines how the PC operating system would interpret the touch event information sent from the controller. Most touch screen drivers emulate the mouse type driver. In this way, touching the screen would be the same as clicking the mouse on the same location on the screen. This enables the touch screen to work with existing software and provides the opportunity to create new applications without the need for specific touch screen programming. Devices such as specialized computer systems, thin client terminals, and DVD players do not use software drivers or have their own built-in touch screen driver. The touchscreen is one of the simplest PC interfaces to use, making it the ideal interface for a variety of applications. Touchscreen devices have gained prominence over the years with a constant drop in price in the last decade. Touchscreens are commonly used in ATMs, PDAs, cell phones, supermarket terminals, and more prominently in video games.