For high-frequency current, capacitors direct conductor, so the finger from the contact point to a very small current Current outflow from the electrodes on the four corners of the touch screen, and flows through four electrodes with finger to the four corners proportional to the distance, the controller through the accurate calculation of the four current ratio, draw the location of the touch points. The capacitive touch screen schematic: compared to traditional resistive touch screen, capacitive touch screen advantages are mainly the following aspects: new operation. The capacitive touch screen supports multi-touch operation more intuitive, more fun. The resistive touch screen only supports single touch. And also, this kind of cell phone jammer is one of the main products.
Not easy to inadvertently. The capacitive touch screen sensor to the body's current, only the human body in order to operate, and will not touch with other objects accordingly, so basically to avoid the possibility of inadvertently. Durability. Compared to the resistive touch screen, capacitive touch screen in a dust-proof, waterproof, wear better performance. As a legitimate red touch-screen technology, the capacitive touch screen with a gorgeous interface, multi-touch, only the human body sensors and other advantages, but at the same time, it also has the following disadvantages: the accuracy is not high. For technical reasons, the accuracy compared to the capacitive touch screen resistive touch screen, which had been lacking. The advanced technology of cell phone jammers is adopted by more customers for the high quality and performance.
And only use your finger to input, difficult to achieve recognition complex on a small screen handwriting input. Vulnerable to environmental impact. Environmental factors like temperature and humidity changes can also lead to instability of the capacitive touch screen and even drift. Such as a user in the use of the body close to the screen may cause drift, even in a crowded operation can also cause drift. This is mainly due to the capacitive touch screen technology works, although the distance from the screen of the user's finger is closer, but around the screen, there are a lot of volume is much larger than the electric field of the fingers simultaneously, which would affect the judgment of the touch location. (3) high cost. In addition, the capacitive touch-screen touch pad attached to the LCD panel step there are still some technical difficulties, so virtually has also increased the cost of capacitive touch screen. It is towards the parameter and performance of phone jammer .
Projected capacitive multi-touch capacitive screen technology the projective Capacitive technology, multi-touch hope. Its basic principle is still mainly based on capacitive sensing, but compared to surface capacitive touch screen, projected capacitive touch screen with multi-layer ITO layer, each layer ITO layer are connected to the electrode and processor to form a matrix distribution to X axis, Y-axis cross-distribution as the capacitance matrix, when the finger touches the screen by the X-, Y-axis scan to detect the touch position capacitance changes and then calculate the finger lies. Based on this framework, a projected capacitive multi-touch operation can be done. However be noted that the axis interleaved multi-touch gesture recognition capabilities. The technology can ensure the high quality and performance of cellphone jammer .
To locate the multi-point touch the correct position is still difficult. Because during the two axial scan, the two touch points, respectively, in the X-axis and Y axis have two peaks, the intersection of up to produce four contacts, two of which is a pseudo touch points. This causes the system can not be the correct interpretation. The solution is to increase the axial identifiable contact position, the number of each an axial multi-identification of 1:00 (2:00 identifiable, such as 3-axis, 4 axis 3:00); in theory, each add a layer of ITO layer will add a little more touch. However, such technology because of the limitations of their mobile phone screen size, the ITO layer can not be too much, used in mobile phones which can only have up to four layers. The technical innovation of cell phone jammer should be increased.
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