Touch panel

Touch panel, a first-class input signal to receive touch of inductive LCD display device that, when contact on the screen of the graphic buttons, screen tactile feedback system can accordingto programming program drive connections device, substitute for mechanical buttons panels, and borrows by liquid crystal display pictures create vivid audio effect.

introduction

With the growing of multimedia information query, more and more people talking about touch screen, because touch screen is durable and reaction speed, save a space, easy communication and many other advantages. Using this technique, our users as long as fingers lightly touch computer screen map operator or text can achieve to host operation so that the human-computer interaction more straightforward, this technology greatly facilitate those who do not know how to operate computer users.

Touch screen as a kind of the latest computer input device, it is currently the most simple, convenient and natural way of a kind of human-computer interaction. It is endowed with multimedia with a brand new look, is intriguing new multimedia interactive devices. Touch screen application in our country range is very wide, main is public information query, Such as telecommunication bureau, tax bureau, bank, electric power industries business query; The city streets and information query; Besides applied to leadership office, industrial control, military command, electronic games, the song order, the multimedia teaching, presale property, etc. In the future, touch screen will walk into family.

With use computers as an information source increases, touch screen with its easy to use, durability and reaction speed, save a space etc, and makes the system designers more and more feel use touch-screens indeed possess a considerable advantages. Touch screen appears in the Chinese market since only a few short years time, the new multimedia devices have yet to many people, including some contact and understanding are planning to use touch-screens systems designer, also all the touch screen as optional equipment, from developed countries and China's popularization of course touch screen multimedia information is in the stage of perspective, this kind of idea still has certain universality. In fact, touch screen is a make multimedia information or control revamped equipment, it is endowed with multimedia system with a brand new look, is intriguing new multimedia interactive devices. The developed countries of the system designers and China's pioneered the use of touch screen system designers have clear know, touch screen for various applications of computer is no longer dispensable things, but the indispensable equipment. It greatly simplifies the use of computers in the computer, even the ignorant, so also can exist, make computer more enchantful. Solve the public information on the market by computers can't solve the problem.

With city towards informational development and computer network in the national life of infiltration, information query are already with touch screen realization - showing the content may touch of form. In order to help you to touch screen has a probably understanding, author will provide some relevant here touch screen relevant knowledge, hope these content to everybody have useless.

Working principle

In order to operate convenient, people use touch screen to replace the mouse or keyboard. Work, we must begin with a finger or other objects in front of the monitor installation touch touch screen, then the system according to the fingers of the ICONS or menu position to locate the choice information input. Touch screen by touching detection components and touch screen controller composed; Touch detection components are installed in the display screen, which is used to detect users touch front position, accept to touch screen controller, And touch screen controller main effect from touching point detection device receives touch information, and convert it into contacts coordinates, before sending it to the CPU, it also can receive orders from the CPU and apply execution.

Main types

From the technical principle to distinguish touch screen, can be divided into five basic categories: vector pressure sensor technology touch screen and resistance, capacitance technology technology touch screen touch screen, infrared technology touch screen, surface acoustic technology touch screen. Including vector pressure sensor technology touch screen have withdrawn from the stage of history, Infrared technology touch screen, but its low price to go up the casing outside fragile, easy to generate light interference, surface cases distortion; Capacitor technology design conception is reasonable, but touch its image distortion problem is difficult to get fundamental solutions, Resistance technology touch screen accurate positioning and but its price is quite high, and lest scraping the vulnerability, Surface acoustic touch-screen solves the touch screen, various defects of the clear not easily damaged, suitable for various occasions, defect is screen surface if there is water and dust will make touch screen become slow, even don't work. According to the work principle and touch screen transmit information medium, we put the touch screen is divided into four kinds, they are classified as resistive, capacitance inductive, infrared type and surface acoustic type. Every kind of touch screen has its own advantages and disadvantages, to understand which touch screen applies to which occasions, the key lies in the need to know every kind of touch screen technology principle and the characteristics of. Under the face of all these various types of touch screen briefly introduce:

1, resistive touch screen (resistive touch screens work principle chart)

The touch screen by using pressure sensor is controlled. Resistance of main part is a touch screen with the resistance of the display surface cooperated with the film screen, this is a kind of multilayer composite films, it with a piece of glass or hard plastic plate as the basic unit, the surface coated with transparent metal oxide (transparent conductive resistance) conductance layer, again above bore a layer of outside surface hardening treatment, smooth waterproof wipe plastic layer, it is also the inner surface of the coated with coating, among them many tiny (less than 1,000 inch) transparent isolation point two layers separated conductance layer insulation. When a finger touch the screen, two layer conductance layer in touch point had contact resistance changes, in the X and Y directions on signal generation, then sends touch screen controller. Controller to detect the contact and compute (X, Y) position, then based on the simulation of the mouse operate. This is the most basic resistance technology touch screen the principle. Resistance of the key materials technology touch screen, the commonly used transparent conductive coating materials:

A, ITO, oxidation indium, weak electrical conductor, characteristic is when thickness to 1,800 Evans (eloise = 10-10 meters) below will suddenly become transparent, euphotic rate for 80%, again thin down light transmittance instead decline, to 300 ella thickness and up to 80%. ITO is all resistance and capacitance technology touch screen technology touch screen all use main material, actually resistance and capacitance touch-screen mining technology is ITO coating.

B, nickel gold coating, five line resistance touch screen outer conductance layer is using ductility good nickel gold coating material, outside conductance layer by the frequent touch, the use of ductility good nickel gold materials purpose is to prolong service life, but relatively high processing cost. Nickel gold conductance layer though ductility is good, but only do transparent conductor, do not suit as resistance, because it touch screen face high conductivity, and metal thickness is very even and be very difficult to do, unfavorable make voltage distribution layer, only as agent layer.