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The basic principle and characteristics of smart phone touch screen

Author:admin Time:2017-07-27

We are accustomed to the smart phone touch screen brought about by the convenience, many are not very clear about the principles and characteristics of smart phone touch screen, the following tells you about the principles and characteristics of mobile touch screen.
Smart phone touch screen concept: touch screen is a computer input device, and can realize the input keyboard and click the mouse is different, it can let the user by touching the screen to choose. The computer with touch screen requires little storage space, few moving parts, and can be encapsulated. Touch screens are more intuitive to use than keyboards and mice, and training costs are low.
The main component of the touch screen is (1) a sensor unit for processing the user's choice
(2) a controller that senses, touches, and positions
(3) driven by a software device that transmits touch signals to a computer operating system.
There are five kinds of touch screen sensors: resistance technology, capacitance technology, infrared technology, acoustic technology and near-field imaging technology.
The resistive touch screen usually consists of a flexible top film, and a layer of glass as the base and insulated by insulation points. The inner surface coating of each layer is a transparent metal oxide. The voltage has a difference in each diaphragm. Pressing the top layer film forms an electrical contact signal between the resistor layers.
The capacitive touch screen has a transparent metal oxide as a coating and is bonded to a single layer of glass surface. It is not like any resistive touch screen, touch will form a signal, capacitive touch screen and touch to finger directly, or contact with the conductive stylus. The capacitance of a finger, or the ability to store a charge, absorbs the current of each corner of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four angle so that the touch point is reached.
Light based interrupt technology for infrared touch screen. It does not place a film layer in front of the display surface, but an outer frame around the display. The frame has light source, or light emitting diode, located in the outer side, and the light detector or photoelectric sensor on the other side, the corresponding infrared grid formation crisscross. When the object touches the display screen, the invisible light is interrupted and the photoelectric sensor cannot accept the signal so that the touch signal is determined.
In acoustic sensors, sensors are mounted on the edge of the glass screen to send ultrasonic signals. The ultrasonic wave is reflected through the screen, accepted by the sensor, and the received signal is attenuated. In surface acoustic waves, light waves pass through the surface of the glass, while guided acoustic waves pass through the glass.
The near field imaging touch screen consists of two thin glass layers with a transparent metal oxide coating in the center. An AC signal is applied to the guide point coating to produce an electric field on the surface of the screen. When a finger, do not wear gloves can, or other conductive stylus touch sensor, electric field perturbation, in order to get the signal.
With the use of computer as a source of information on the touch screen grow with each passing day, with its easy to use, durable, fast reaction speed, space saving and other advantages, making the system more and more designers are using the touch screen indeed has great superiority. The touch screen appears in the Chinese market has only just a few years time, the new multimedia device is not as many people contact and understanding, including some system designers are going to use the touch screen, the touch screen is not essential for the equipment, from developed countries to touch screen in China and the course of popularization of multimedia information industry is in the stage of view, this concept also has a certain universality. In fact, the touch screen is a device that enables multimedia information or control over a new look. It gives multimedia systems a new look and is a very attractive new multimedia interactive device. In developed countries the system designers in China and pioneered the use of touch screen system designers already know and touch screen computer for various applications is no longer not essential things, but essential equipment. It greatly simplifies the use of computers, even the computer absolutely ignorant of people, still can come in handy, make the computer show greater charm. It solves the problem that the computer can not solve in the public information market.
The three main categories of touch screen are:
(1) resistance technology touch screen;
(2) surface acoustic wave technology touch screen;
(3) capacitive technology touch screen;
Each type of touch screen has its own advantages and disadvantages, and it is important to understand the principles and characteristics of each touch screen technology to understand the kind of touch screen that is suitable for that occasion.
1 、 resistance technology touch screen:
The main part of resistive touch screen resistive touch screen is a display screen and the resistance of the film surface is very fit, this is a kind of multilayer composite film, with a layer of glass or plastic plate as the base map of the surface with a layer of transparent conductive metal oxide layer on the outer surface covered with a layer of hardening smooth processing, anti rub plastic layer, its inner surface is coated with a layer of ITO coating, among them there are many tiny transparent isolation to two conductive layers separated by an insulating. When the finger touches the screen, the two layer of conductive layer has contact at the touch point position, the controller detects the contact and calculates the position of (X, Y), and then operates according to the way the mouse is simulated. This is the basic principle of the resistive touch screen. Since the resistance screen came into the market, it has been of stable quality and reliable quality

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