Touchscreen for tablet is one of the key components. You could say fundamental. If not for him, then work with the gadget would be performed using mechanical control buttons.
What is this
Touchscreen for a tablet or any other technology is a means of entering information. This device is a screen that responds to touching it. It is he who is responsible for supplying control signals to the operating system or applications on the gadget. If we draw an analogy, then the touch screen is a mouse and keyboard for a tablet.
Views:
- Resistive. A touchscreen of this type is a transparent membrane with a conductive coating, under which there is a glass containing a similar layer. The principle of operation of this device is quite simple. When you press a stylus or a finger on the screen, the membrane and glass close at a certain point, as a result of which the voltage changes in it. The microprocessor captures these fluctuations and calculates the coordinates. Such a touch screen has a low cost. Also in his favor is the possibility of responses to touch with any objects. But it has low strength and a small working life, which is about 35 million clicks for each point. And - no less important - the lack of the ability to implement multi-touch. Also, the operation of this display is accompanied by a large number of errors in the processing of gestures "sliding" and "swiping". This technology is not widely used in tablets. Today you can find single models of devices equipped with a similar touch screen. For example, touchscreen for tablet "TEXET TM-7020".
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touchscreen for texet tablet Capacitive. This is the second technology used to create touch screens. These touch screens can only be operated with a finger or a conductive stylus. This type of touchscreen can be divided into two categories: conventional and projected-capacitive. In the first type of devices, a conductive layer is applied to the glass. Electrodes are placed at the corners of the display, which apply an alternating voltage to the coating. When you touch the screen with your finger, current leakage occurs. The microprocessor monitors the point of contact. This is done by changing the readings of the electrodes, since the current strength increases significantly at the nearest electrode and the resistance decreases. Full multi-touch on this type of screens will not work.
- More advanced technology is projected-capacitive. The inner side of the display in this case is covered with a grid of electrodes. When one of them is touched, a capacitor is formed, according to the capacitance of which the coordinates are calculated. Thistechnology allows you to implement a full-fledged multitouch. That is, such a display is capable of supporting 2, 5 or even 10 simultaneous touches. A striking example of the implementation of this technology is the touchscreen for the tablet "EXPLAY sQuad 9.71".
Mounting Methods
Installing the touch screen to the gadget is done by gluing. The touchscreen for the tablet is mounted either on the display or on the case. In the first case, the adhesive base can be applied only around the perimeter or over the entire area of the screen. In the second case, it is distributed over the body parts with which the sensor is in contact.
Material
Touchscreen for a tablet can be made of glass or plastic. In the first case, the touch screen has lower strength characteristics. In addition, when it is damaged, cracks are immediately visible. Devices made of plastic are more durable. And in case of damage, the appearance of cracks is unlikely.
