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The Basic Principle Of Touch Screen Displays



For ease of operation, people use a touch screen display instead of a mouse or keyboard. When working, we must first touch the touch screen display installed on the LCD or the front of the monitor with your fingers or other objects, and then the system will select the information input according to the icon or menu position of the finger touch. The touch screen display (the operation of the touch screen display) is composed of a touch detection part and a touch screen display controller; the touch detection part is installed in front of the display screen for detecting the user touch position and receiving the rear touch screen display controller; Touch Screen Monitor and the touch screen display controller The main function is to receive the touch information from the touch point detection device, and convert it into contact coordinates, and then sent to the CPU, it can also receive commands issued by the CPU and be executed. This touch screen display is controlled by pressure sensing. The main part of the resistive touch screen display is a resistive film screen that is very compatible with the surface of the display. It is a multilayer composite film with a layer of glass or a hard plastic plate as a base layer coated with a layer of transparent metal (transparent Conductive resistance) conductive layer, which is covered with a layer of external surface hardening treatment, Touch Screen Monitor smooth anti-rubbing plastic layer, its inner surface is also coated with a layer of coating, between them there are many small (less than 1/1000 inch) The transparent barrier points insulate the two layers of the conductive layer. When the finger touch screen display screen, the two layers of conductive layer in the touch point where there is contact, resistance changes, in both X and Y direction of the signal, and then send touch screen display controller. The controller detects this contact and calculates the (X, Y) position, and then operates according to the analog mouse. Touch Screen Monitor This is the resistance technology touch screen touch screen display the most basic principles.

The key to blocking the touch screen display is material technology, commonly used transparent conductive coating materials are: ITO, indium oxide, weak conductor, the characteristic is when the thickness down to 1800 Egypt (Egypt = 10-10 m) will suddenly change Transparent, light transmittance of 80%, Touch Screen Monitor and then thin down the light transmittance but decreased to 300 angstroms and then rose to 80%. ITO is all resistance technology touch screen display and capacitive technology touch screen display are used in the main material, in fact, resistance and capacitance technology touch screen display work surface is ITO coating. Nickel-plated coating, five-wire resistance Touch screen display of the outer layer of conductive layer is the use of good ductility of the nickel coating material, the outer conductive layer due to frequent touch, the use of good ductility of nickel gold material is to extend the service life, But the cost of technology is relatively high. Nickel gold conductive layer although the ductility is good, but can only be transparent conductor, not suitable as a resistance touch screen display surface, because it is high conductivity, and the metal is not easy to do the thickness is very uniform, not for the voltage distribution layer, Touch Screen Monitor only as Exploration layer.

With the increasing use of computers as a source of information, touch screen display with its easy to use, durable, fast response, save space and so on, making system designers more and more feel the use of touch screen display does have a considerable superiority Sex.

Touch screen displays appear in the Chinese market so far only a few years time, this new multimedia device has not been for many people to contact and understand, including some are planning to use touch screen display system designers, but also the touch screen display as a Dispensable equipment, from the developed countries touch screen display popularity and China's multimedia information industry is in the stage of view, Touch Screen Monitor this concept also has a certain universality. In fact, the touch screen display is a multimedia information or control the facelift of the device, which gives the multimedia system with a new look, is a very attractive new multimedia interactive devices. System designers in developed countries and China's first use of touch-screen display system designers have clearly know that touch-screen display for a variety of applications in the computer is no longer a dispensable thing, but essential equipment The It greatly simplifies the use of the computer, even if the computer ignorant of the people, but also able to come in handy, so that the computer show a greater charm. To solve the public information market can not solve the problem of the computer.

Touch screen display of the three main categories are: resistance technology touch screen display, surface acoustic wave technology touch screen display, capacitive touch screen display. Each type of touch screen display has its own advantages and disadvantages, to understand that kind of touch screen display for that occasion, Touch Screen Monitor the key is to understand every type of touch screen display technology works and characteristics.

Introduction to the technical principle of touch screen display

A: Resistive technology Touch screen display:

The main part of the resistive touch screen display is a resistive film screen that fits with the surface of the display. It is a multilayer composite film with a layer of glass or a hard plastic plate as a base layer with a layer of transparent oxidized metal (ITO oxidation Indium, transparent conductive resistance) conductive layer, covered with a layer of outer surface hardened, smooth anti-rubbing plastic layer, its inner surface is also coated with a layer of ITO coating, between them there are many small (less than 1 / 1000 inch) of the transparent isolation points to separate the two layers of conductive insulation. When the finger touch screen display screen, the two layers of conductive layer in the touch point where there is contact, the controller detects the contact and calculate the (X, Y) position, and then according to the way the analog mouse operation. Touch Screen Monitor This is the most basic principle of resistance technology touch screen display.

Resistance screen since entering the market since the stability of the quality, can be * the quality and environmental high degree of adaptability to occupy the majority of the market. Especially in the field of industrial control, due to its high environmental and environmental requirements, but also shows the uniqueness of the resistance screen, so that its products in similar touch products occupy 90% of the market, has become the mainstream products on the market. Its greatest feature is not afraid of oil, dust, water.

G-Touch The latest fourth-generation resistive technology Touch screen display differs from other resistive screen products in that it is a glass-based board that makes the transmittance higher and the reflectivity is more suitable for the user. At the same time, uniform coating of the bottom layer of the conductive layer of the glass on the touch screen display on the electrostatic particles through the ground unloaded to ensure that the touch positioning more accurate and more sensitive to completely lift the charged particles caused by drift phenomenon, , Touch Screen Monitor The reaction is slow, so that it is longer life (physical measurement of a single point for up to 15 years of continuous use), and have the ability to maintain maintenance, scratch resistance has also been greatly improved. Is indeed a quality and reasonable price of the product.

Four-wire resistive screen features:

High resolution, high speed transmission response.

Surface hardness treatment, reduce abrasions, scratches and anti-chemical treatment.

With smooth and matte finish.

A correction, high stability, never drift.

Four-wire resistance analog technology of two layers of transparent metal layer work each layer are increased by 5V constant voltage: a vertical direction, a horizontal direction. A total of four cables are required.

Five-wire resistive screen features:

High resolution, high-speed transmission response.

Surface hardness, reduce abrasions, scratches and access to chemical treatment.

The same point of contact with 30 million can still be used.

Conductive glass as the substrate medium.

A correction, high stability, never drift.

Five-wire resistance analog technology to the two directions of the voltage through the resistor network added to the layer in the metal layer, * both the detection of voltage and detection of the current method of measuring the location of the touch point, while the outer ITO only as Conductor layer, a total of five cables.

B: Surface acoustic wave technology touch screen display

Surface acoustic wave technology is the use of sound waves on the surface of the object to be transmitted, when an object touches the surface, blocking the transmission of sound waves, the transducer detects this change, reflected to the computer, and then the mouse simulation.

Surface sound wave screen features:

High clarity, good light transmission.

High durability, good scratch resistance.

One correction does not drift.

fast reaction.

Suitable for offices, organs and units of the environment more clean places.

Surface acoustic screen need to be regularly maintained, because the dust, oil and even the liquid of the beverage contamination on the screen surface, Touch Screen Monitor will block the touch screen display surface of the waveguide, the wave can not be normal launch, or make the waveform changes and the controller can not be properly identified, thus Affect the normal use of touch screen display, the user must pay strict attention to environmental health. The surface of the screen must always be wiped to keep the screen smooth and regularly erased thoroughly and thoroughly.

C: capacitive technology touch screen display:

Use the body's current sensing to work. When the user touches the screen of the display screen, the user is connected to the surface of the display screen with a coupling capacitor. For the high frequency current, the capacitor is a direct conductor, so the finger sucks a small current from the contact point. This current flows out of the electrodes on the four corners of the touch screen display, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the touch current by accurately calculating the four current ratios position.