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Touch screen classification

Release time:2022-11-21 Hit:583

1. Infrared touch screen: composed of infrared emission and reception sensing components

Principle: A horizontally and vertically intersecting infrared matrix,

Poor stability

-External or built-in, does not affect the appearance of the monitor, and can adapt to large-sized screens

-Possible interference from light

-Good riot prevention performance

-Any object touch

-ompletely enclosed and maintenance free, suitable for harsh environments

-Completely maintenance free after installation

2. Surface acoustic wave touch screen:

The mechanical waves propagating along the surface of the medium are composed of a touch screen, a sound wave generator, a reflector, and a sound wave receiver.

Advantages: Surface acoustic wave touch screen is not affected by environmental factors such as temperature and humidity, with extremely high resolution, excellent scratch resistance, and long lifespan (50 million)

(Secondary fault free), able to maintain clear and transparent image quality; No drift, only one calibration is required during installation; There is a third axis (i.e. pressure axis) response,

Most suitable for use in public places.

Disadvantage: Small size, due to the inability of this technology to be encapsulated, it is easily damaged by surface dirt and moisture, making it unsuitable for many industrial and commercial applications

Application products. Dirty surfaces can cause dark spots to appear on the screen, requiring regular cleaning of the sensor and periodic calibration. Based on the operation of technology itself

The method makes it difficult to avoid unnecessary interference, such as external sound interference.

3. Resistance touch screen:

A resistive touch screen is a type of sensor that is essentially a structure of thin film and glass, with ITO (nano indium) coated on the adjacent side of the film and glass

Tin metal oxide coating, ITO has good conductivity and transparency. When touched, the ITO on the lower layer of the film will come into contact with the glass

The ITO of the layer transmits corresponding electrical signals through sensors, which are then converted into X and Y values on the screen through a conversion circuit and sent to the processor through computation,

And complete the selected action and present it on the screen,

Advantages:

1. The resistive touch screen has high accuracy, up to the pixel level, and is suitable for a maximum resolution of 4096x4096.

2. The screen is not affected by dust, moisture, and oil, and can be used in higher temperature environments.

3. The resistive touch screen uses pressure sensing and can be touched by any object, even when wearing gloves, and can be used for operation

Handwriting recognition.

4. Resistance touch screens are relatively inexpensive due to their mature technology and low threshold.

Disadvantages:

1. A resistive touch screen can be designed with multiple touch points, but when two points are simultaneously pressed, the pressure on the screen becomes unbalanced, leading to touch errors,

Therefore, the implementation level of multi touch is relatively difficult.

2. The proportion of resistive touch screens is prone to scratches, resulting in damage to the touch part of the screen.

3. Low transmittance and low temperature sluggishness

Capacitive touch screen:

Capacitive touch screen technology works by utilizing the human body's current induction. A capacitive touch screen is a four layer composite glass screen, which is

The inner surface and interlayer are each coated with a layer of ITO. The interlayer ITO coating serves as the working surface, and four electrodes are led out from the four corners. When fingers touch the metal layer

When on, due to the electric field of the human body, a coupling capacitor is formed between the user and the touch screen surface.

Advantages:

1. A capacitive touch screen only requires touch and does not require pressure to generate signals.

2. The capacitive touch screen only needs to be calibrated once or completely after production.

3. The lifespan of the capacitor solution is longer because the components in the capacitor touch screen do not require any movement.

4. Capacitor technology is superior to resistance, infrared, and acoustic technology in terms of light loss and system power consumption.

5. A capacitive touch screen can support multi touch technology.

Disadvantages:

1. The main problem is drift: when the environmental temperature and humidity change, and the environmental electric field changes, it will cause drift of the capacitive screen, causing touch

Inaccurate, (surface dirt, customer usage environment such as static electricity, temperature, magnetic field, unstable voltage)

Optical touch screen:

CCD optical sensors have significantly improved accuracy, response speed, and lifespan, which is a future trend.

Advantages:

1. Supports multi touch and dual writing.

2. Suitable for various displays such as LCD, PDP, LED, and projectors (front projection, back projection), with sizes ranging from 15 inches to 250 inches.

3. With multi screen interactive function, a computer can connect up to 4 touch screens.

4. Driver free, the touch screen can be directly used after connecting to the PC host, without the need to install drivers. It can still be used normally after replacing different computers.


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