Produce Discount Capacitive Touchscreens Glass Promotions Price


Capacitance Touchscreens Glass

Surface capacitive touch screen is to sense the touch behavior of the screen surface through electric field induction. Its panel is a uniformly coated ITO layer, and each of the four corners of the panel has an outgoing line connected with the controller. When working, the surface of the touch screen generates an even electric field. When a grounded object touches the surface of the screen, the electrode senses a change in the surface charge and determines the coordinates of the contact point.

Surface capacitive touch screen has long service life, high light transmittance, but low resolution and does not support multi-touch. Currently, it is mainly used in large-size outdoor touch screens, such as public information platform (POI) and public service (sales) platform (POS).

Projective capacitive touch screen uses the electrostatic field line emitted by the touch screen electrode for induction. Projective capacitive sensing technology can be divided into two types: self-capacitance and interactive capacitance.

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Self-capacitance, also known as absolute capacitance, takes the sensing object as another electrode of the capacitor, which senses the electric charge between the sensing electrode and the sensing electrode, and determines the position by detecting the change of the coupling capacitance. However, if it is a single touch, there is only one set of coordinates determined in the X and Y axis direction through the capacitance change, and the combined coordinates are also unique. If two points are touched on the touch screen and they are not in the same X direction or the same Y direction, and there are two coordinate projections in the X and Y directions respectively, then 4 coordinates are combined. Apparently, only two coordinates are real, and the other two are commonly known as ghost points. As a result, self-capacitive screens cannot be truly multitouch.

Mutual capacitance, also known as spanning capacitance, is a capacitor generated by coupling adjacent electrodes. When an object is perceived to be near an electric field line from one electrode to the other, the change of mutual capacitance will be felt. When the transverse electrodes send excitation signals successively, all the longitudinal electrodes receive signals at the same time. In this way, the capacitance values at the intersection points of all the transverse and longitudinal electrodes can be obtained, that is, the capacitance values of the two-dimensional plane of the whole touch screen. When human fingers are close to each other, local capacitance will be reduced. According to the two-dimensional capacitance variation data of the touch screen, the coordinates of each touch point can be calculated. Therefore, the real coordinates of each touch point can be calculated even if there are multiple touch points on the screen.

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In both types of projective capacitive sensors, the sensor capacitance can be designed in such a way that it can detect a finger touch, not just one finger, but multiple fingers, at any given time. Since the great success of apple's iphone and iPad series in 2007, projective capacitive screen has started the development of gusher type, rapidly replacing resistive touch screen and becoming the mainstream touch technology in the current market.

Infrared touch screen is to use X, Y direction of dense infrared matrix to detect and locate the user's touch. Infrared touch screen in the front of the display installed a circuit board outer frame, the circuit board in the screen four sides arranged infrared transmitter tube and infrared receiver tube, one by one corresponding to the cross infrared matrix. When the user touches the screen, his finger blocks two infrared rays that pass through the screen, which allows him to determine the position of the touch point on the screen.

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Infrared touch screen has the advantages of high light transmittance, free from the interference of current, voltage and static electricity, and high touch stability. However, the infrared touch screen will be affected by the change of ambient light, remote control, high-temperature objects, incandescent lamp and other infrared sources, and its accuracy will be reduced. The early infrared touch screen appeared in 1992, with a resolution of only 32×32, which is easily affected by environmental interference and requires to be used in a certain shading environment.

After 20 years of development, the current advanced infrared touch screen has a life span of more than 7 years under normal working environment. When tracking the finger movement track, the accuracy, smoothness and tracking speed can meet the requirements. The user's writing can be smoothly converted into the image track, and the handwriting recognition input is fully supported. Infrared touch screen is mainly used in all kinds of public places, offices and industrial control places without interference of infrared and strong light.

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