This touch screen is created from several layers, in this type of touch screens, two screens are located on each other in parallel to a short distance, that there are very small pieces of metal on each screen that do not collide with each other, but when touching the screen with a finger or any other device, two parts of metal collide at that point. Following this collision, the relevant information is sent to an external circuit and after analysis, the detection process of the collision site begins.
This display model is cheaper than other models, but its outer face is very reactive to the crown or touch of the finger and other objects and is easily damaged in contact with sharp objects. On the other hand, this model has a special advantage that is very resistant to moisture and dust. Due to the presence of metal parts under the plates of this model, objects do not directly contact the sensor. This model of touch screen reacts in dealing with any objects and it is not necessary to work with it by hand.This type of display model has a big drawback and this is also that the transparency of the passing image is somewhat reduce.
This model is made of many sensors that are made of ITO Indium Tin Oxide and lead. Also, two chemicals with formulas sno2 and In2o3 are made up of touch screens are constantly passing the electric current uniformly, which makes it always moving within each sensor a certain amount of electron, all sensors are connected to a countercurrer and because the human body is conductive due to the touch of these touch screens and because of the potential difference between the hand and the touch screen, some amount of electron It is sent by hand and this changes the flow in the sensor on which the touch is performed. Changing the flow of these sensors is transmitted to the controllers and the touch location is detected, in this type of touch screen due to the necessity of transferring electron from hand to screen can not be worked with by holding gloves you have to work with it either by hand or with a device called stylus which is made of metal. In this model, unlike previous models, the quality of images is not reduced by plates. Apple's iPhone product uses this type of touch screen.
This touch display model is much less applicable than other models, the speed of transmission of these waves is like the speed of wave movement in the air. The way this system is used is continuously sent at the surface of the screen waves with the speed of sound. Nothing happens until something enters this space, but at the same time as the object or touch enters this range, the reflected wave is received by another receiver. A processor detects the touch location, taking into account the speed of wave propagation and the difference between radiation and its reflection. This saw touchscreen model is one of the most advanced touch screens but is largely vulnerable to external factors such as dust and humidity.
In this model, the plates are operated using infrared waves of the screen, but in this model, the identification of points and objects is very different from the infrared system. A number of infrared light generators emit their light in different directions on the surface of the display, in addition, due to the increase in infrared light propagation at the display level, several reflector screens are located around the touch screen, which by entering each object, the emitted light waves are reflected and broken, and these reflected waves are placed at different angles by infrared cameras. In the processor software, the images of these cameras are matched and after image processing the coordinates of the object are calculated. One of the positive features of this model is the lack of need for different surfaces and therefore a great increase in image quality and due to the use of image processing system in some conditions, the reaction of this system is delayed slightly.
In this model, the imotach touch stand and imutach touch table are equipped with this technology, IR waves are generated by transmitters on two sides of the screen and sent to the opposite two sides with infrared receivers. After the objects are imported to this range, it causes the receivers to disconnect with the opposite senders, which after determining the sequence number of the sensors is disconnected, the details of the object entry are identified, because this model of the screen does not need the surface, the display light is displayed unobstructed and with the original quality.