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What is a capacitive touch screen?

1. Capacitive technology touch screen
In order to facilitate the operation, people use a touch screen instead of a mouse or keyboard. in working, 
Eight-wire resistive touch screen
Capacitive touch screen
First touch the touch screen installed on the front of the display with a finger or other object, and then the system locates and selects information input according to the position of the icon or menu touched by the finger. The touch screen consists of a touch detection component and a touch screen controller; the touch detection component is installed in front of the display screen to detect the user's touch position, and then send it to the touch screen controller; the main function of the touch screen controller is to receive touches from the touch point detection device Information, and convert it into contact coordinates, and then send it to the CPU, it can also accept the command sent by the CPU and execute it
It uses the current induction of the human body to work. The capacitive touch screen is a four-layer composite glass screen. The inner surface and the interlayer of the glass screen are each coated with a layer of ITO. The outermost layer is a thin layer of silica glass protective layer. The interlayer ITO coating is used as the working surface, and the four corners lead out Four electrodes, the inner ITO is a shielding layer to ensure a good working environment. When a finger touches the metal layer, due to the electric field of the human body, a coupling capacitor is formed between the user and the touch screen surface. For high-frequency current, the capacitor is a direct conductor, so the finger draws a small current from the contact point. This current flows from the electrodes on the four corners of the touch screen, and the current flowing through these four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the ratio of these four currents to get the touch point position.
Infrared touch screen
In the early conception, infrared touch screens had technical limitations such as low resolution, limited touch methods, and susceptibility to environmental interference and misoperation, and thus faded out of the market. Since then, the second-generation infrared screen has partially solved the problem of anti-light interference. The third and fourth generations have also improved resolution and stability, but they have not made a qualitative leap in key indicators or overall performance. However, anyone who knows touch screen technology knows that infrared touch screens are not interfered by current, voltage and static electricity, and are suitable for harsh environmental conditions. Infrared technology is the ultimate development trend of touch screen products. Touch screens that use acoustics and other materials science technologies have their insurmountable barriers, such as damage to a single sensor, aging, fear of contamination of the touch interface, destructive use, and complicated maintenance. As long as the infrared touch screen truly achieves high stability and high resolution, it will replace other technical products and become the mainstream of the touch screen market.
In the past, the resolution of infrared touch screens was determined by the number of infrared pairs in the frame, so the resolution was low. The main domestic products on the market were 32x32 and 40X32. In addition, infrared screens are more sensitive to light environment factors, and the light changes more. It will misjudgment or even crash when it is big. These are the weaknesses of the infrared screens sold by domestic agents of foreign non-infrared touch screens. The resolution of the latest technology fifth-generation infrared screen depends on the number of infrared pairs, scanning frequency and difference algorithm. The resolution has reached 1000X720. As for the infrared screen is unstable under light conditions, from the second-generation infrared touch screen From the beginning, the weakness of anti-light interference has been better overcome.
The fifth-generation infrared touch screen is a new generation of intelligent technology products. It has realized 1000*720 high resolution, multi-level self-adjustment and self-recovery hardware adaptability and highly intelligent discrimination and recognition, which can be used in various harsh environments for a long time Use it at will. And can be customized for users to expand functions, such as network control, sound sensing, human proximity sensing, user software encryption protection, infrared data transmission, etc. The other major shortcoming of the infrared touch screen promoted by the original media is its poor riot resistance. In fact, the infrared screen can use any riot glass that the customer thinks is satisfactory without adding too much cost and affecting the performance. This is something other touch screens cannot imitate.

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