The capacitive screen can be simply regarded as a screen composed of four layers of composite screens: from the outside to the inside, they are glass protective layer, conductive layer, non-conductive glass screen, and conductive layer. The innermost conductive layer plays the role of shielding the internal electrical signal, and there are direct leads at the four corners or four sides of the conductive layer in the middle to be responsible for the detection of the direction of the touch point, which is the key part of the whole screen. The double glass protects the conductor layer and the sensor to better support multi-touch.
Advantages of using capacitive screen in industrial tablet PC:
1. Be able to make multi-point contact.
2. High positioning accuracy.
Defects of capacitive screen used in industrial tablet PC:
1. The main defect of the capacitive screen is drift: when the ambient temperature, humidity, and electric field change, it will cause the drift of the capacitive screen, resulting in the inaccurate operation of the industrial tablet computer. For example, after the industrial tablet is turned on, the temperature of the display screen will rise, and it will form a drift; While the user touches the screen, the other hand or side of the body approaches the display, etc. The reason for the drift of the capacitive screen is a congenital deficiency of technology, although the environmental potential surface is far away from the capacitive contact screen, it is much larger than the finger area, which directly affects the determination of the contact direction.
2. The capacitive screen can only sense the contact of objects with bioelectricity, such as fingers, if you want to use other objects to operate the capacitive screen, the industrial tablet computer will not have any repercussions.
A resistive contact screen is a sensor that converts the physical orientation of the contact point (X,Y) in a rectangular area into a voltage representing the X and Y coordinates. The resistive contact screen is a thin film and glass structure, and the adjacent side of the film and glass is coated with ITO (nano-indium tin metal oxide) coating, and ITO has good conductivity and transparency. When the contact operation, the ITO of the thin film base layer will contact the ITO of the upper layer of the glass, send out the corresponding electrical signal through the inductor, send it to the processor through the conversion circuit, and convert it into X and Y values on the screen after calculation, and complete the selected action, and present it on the screen of the industrial tablet computer.
Advantages of using resistive screens in industrial tablet PCs:
1. The cost is cheap, and the response sensitivity is also very good.
2. It can adapt to all kinds of harsh environments, and can operate industrial tablet computers with anything.
Defects of resistive screens used in industrial tablet PCs:
1. Only a single touch, that is, you can only contact one place of the industrial tablet PC at a time, and if you go to contact another place, it will have no effect.
2. Because the resistive screen requires a certain pressure, it is easy to form surface wear after a long time, which affects the service life of the product.
3. The ability of the resistive screen to avoid misoperation is poor, and anything that touches it will cause action.
How to distinguish between capacitive screen and resistive screen
The resistive screen does not support multi-touch, and can be controlled by sharp and insulating objects such as fingernails and stylus; The capacitive screen relies on the capacitance formed by the human body and the electrodes to complete the positioning, and it must be touched by the skin or other objects that can conduct electricity.
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