The touch industrial display is an intelligent operation display terminal that replaces the traditional control buttons and indicator lights. It can be used to set parameters, display data, and monitor device status. It is convenient, fast and expressive, and can be simplified as PLC control program. The powerful touch industrial display creates a friendly human-machine interface. As a special computer peripheral. Touch industrial display is the most simple, convenient and natural way of human-computer interaction. Touch industrial display are divided into capacitive screens and resistive screens. In the face of complex industrial environments, how do users choose a touch type industrial display that suits them according to their needs?
The capacitive touch industrial display screen is a transparent special metal conductive material pasted on the glass surface. This inductive touch industrial display consists of five layers. The first layer is the glass bottom layer, the second layer is the conductive layer, the third layer is the glass sensing layer, the fourth layer is the anti-reflection matte or bright surface layer, and the fifth layer is the anti-noise protection layer. When the finger touches the surface of the capacitive touch industrial display screen, the sensing method is that the voltage is connected to the four corners of the glass layer, and the voltage is spread on the glass layer through the electrodes to establish a constant voltage electric field, and the capacitance of the contact will occur at the same time. The frequency of the oscillator connected to it changes, and the touch position can be determined to obtain information by measuring the frequency change. Since capacitance varies with temperature, humidity, or grounding conditions, it is less stable and tends to drift. In addition, when the surface layer is touched, the current is collected from the four corners of the glass layer, and the controller calculates the distance from the current to the position of the finger, so as to determine the exact position of the touch.
The working principle of the resistive touch industrial display is mainly to realize the operation and control of the screen content through the principle of pressure sensing. The screen body part of the touch industrial display is a multi-layer composite film that is very compatible with the display surface. The first layer is a glass or plexiglass bottom layer, the second layer is an interlayer, and the third layer is a multi-component resin surface layer. The surface is also coated with a transparent conductive layer, which is covered with a hardened, smooth and scratch-resistant outer surface. plastic layer. The conductive layer and glass layer sensor on the surface of the polyester surface are separated by many tiny partitions; the current passes through the surface layer, when the surface layer is touched lightly, it touches the bottom layer, and the controller reads out the corresponding current from the four corners at the same time. And calculate the distance of the finger position.
This touch industrial display uses two highly transparent conductive layers to form a touch-type industrial display screen, and the distance between the two layers is only 2.5 microns. When a finger touches the industrial display screen, the two conductive layers that are usually insulated from each other have a contact at the touch point. Because one of the conductive layers is connected to the 5V uniform voltage field in the Y-axis direction, the voltage of the detection layer is changed by Zero becomes non-zero. After the controller detects this connection, it performs A/D conversion and compares the obtained voltage value with 5V to obtain the V-axis coordinate of the touch point. Similarly, the X-axis is obtained. Coordinates, this is the most basic principle common to all resistive technology touch industrial displays.
The working principle of this infrared touch industrial display is relatively simple. You only need to add a spot distance frame to the display, without adding a coating or connecting a controller to the screen surface, and then adding a spot distance frame to the display. The infrared emitting and receiving sensing elements are arranged on four sides, and an infrared detection network is formed on the surface of the screen. When any touch object touches a certain point of the industrial display screen, it will block the two horizontal and vertical infrared rays passing through the position, and the computer can calculate it immediately. Touch point location. The infrared touch industrial display is not disturbed by current, voltage and static electricity, and is suitable for some harsh environmental conditions. Since the infrared touch industrial display does not have a capacitive charging and discharging process during operation, the response speed is faster than that of the capacitive type, but the resolution is lower.
The working principle of the surface acoustic wave touch industrial display is mainly based on the principle that mechanical waves propagate on the surface of a certain medium. Work, receive sound waves through the sound wave receiver, and then transmit signals to the touch-type industrial display screen through the sound wave reflector, in which the sound wave generator can send a high-frequency sound wave across the screen surface, when the finger touches the screen, the touch The sound wave is blocked, and the received signal is converted into a coordinate value, thereby determining the coordinate position of the specific touch point. The controller can measure the pressure of the touch-type industrial display screen by the amount of energy absorbed by the sound wave, and return the response at the same time. The coordinate value of the touch pressure size.
On the surface of the surface acoustic wave touch industrial display screen, the X-direction and Y-direction acoustic wave transmitters and acoustic wave receivers are pasted, and around the glass screen, there are 45-degree reflective sound wave stripes engraved. The controller generates a 5.53MHZ signal, which is transmitted to the transmitting transducer through the cable, and the piezoelectric transmitting transducer converts it into ultrasonic energy and sends it out. After two reflections by the reflection stripes, it propagates to the receiving transducer, and is converted into an electrical signal and transmitted to the controller. Since the surface acoustic wave touch industrial display screen is composed of a touch industrial display screen, a sound wave generator, a reflector and a sound wave receiver, especially the sound wave sensor is not affected by environmental factors such as temperature and humidity, and has a very high resolution and excellent performance. Excellent scratch resistance, long life; high light transmittance, can maintain clear and bright image quality; no drift, only one correction during installation; there is a third axis (ie pressure axis) response, which is most suitable for use in public places.
So which one is best for your project?
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