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Resistive VS Capacitive Touch Screen, What's The Difference Between Them?

Resistive VS Capacitive Touch Screen, What's The Difference Between Them?

August 24 , 2023 0

Touch screen with the passage of time, the level of technology is constantly updated iterative, technology in the continuous innovation, in the level of technology, resistance touch screen and capacitive touch screen between what is the link, compared to them who will be better? This article will analyze the difference between them from the application level, technical level and other aspects!

Capacitive Touch Screen And Resistive Touch Screen

What Is Capacitive Touch Screen

The Basic Principle Of Resistive Touch Screen

Resistive touch screens utilize pressure sensing for control. The main part of the resistive touch screen is a piece of resistive film screen that fits very well with the surface of the display, which is a multilayered composite film with a layer of glass or a hard plastic plate as the base layer, coated with a layer of transparent metal oxide (transparent conductive resistor) conductive layer.
Resistive touch screens utilize pressure sensing for control. The main part of the resistive touch screen is a resistive film screen with the display surface is very compatible, which is a multi-layer composite film, it is a layer of glass or hard plastic plate as a base, coated with a layer of transparent oxide metal (transparent conductive resistance) conductive layer, above and then cover a layer of hardening treatment of the outer surface, smooth friction-proof plastic layer, the inner surface of which is also coated with a layer of coating, between them there are a lot of Tiny (less than 1/1000 inch) transparent isolation point to the two layers of conductive layer insulation.
Resistive technology touch screen of the most basic principles: when the finger touch screen, the two layers of conductive layer in the touch point position there is contact, the resistance changes in the X and Y directions to generate signals, and then sent to the touch screen controller. The controller detects this contact and calculates the position (X, Y), and then operates according to the analog mouse.

Resistive touch screen is the key to the material technology, commonly used transparent conductive coating materials are:

A, ITO, indium oxide, weak conductor, the characteristics of when the thickness drops to 1800 Å (Å = 10-10 meters) below will suddenly become transparent, transmittance of 80%, and then thin down the transmittance instead of decreasing to 300 Å thickness rose to 80%. ITO is all resistive technology touch screen and capacitive technology touch screen are used in the main material, in fact, resistive and capacitive technology touch screen work surface is the ITO coating. ITO is the main material used in all resistive and capacitive touch screens, in fact, the working surface of resistive and capacitive touch screens is ITO coating.

B, nickel gold coating, five-wire resistive touch screen of the outer conductive layer is used in the ductility of the nickel gold coating material, the outer conductive layer due to frequent touch, the use of ductile nickel gold material is designed to extend the service life, but the process cost is more expensive. Nickel-gold conductive layer, although good ductility, but only as a transparent conductor, not suitable for resistance touch screen as the work surface, because it is high conductivity, and metal is not easy to do the thickness is very uniform, should not be used as a voltage distribution layer, can only be used as a probe layer.

Resistive Screen limitations

Whether it is a four-wire resistive touch screen or five-wire resistive touch screen, they are a completely isolated from the outside world of the working environment, not afraid of dust and water vapor, it can be touched with any object, can be used to write and draw, more suitable for the industrial control field and the use of the office of a limited number of people. Resistive touch screen common disadvantage is because the outer layer of the composite film using plastic materials, do not know the person too hard or use a sharp touch may scratch the entire touch screen and lead to scrap. However, within limits, scratches will only hurt the outer conductive layer, the outer conductive layer of scratches for the five-wire resistive touch screen does not matter, while the four-wire resistive touch screen is fatal!

What Is Capacitive Touch Screen

The Basic Principle OF Capacitive Touch Screen

Capacitive touch panels work with human current sensing. The capacitive screen is a four-layer composite glass screen. The inner surface and the middle layer of the glass screen are coated with ITO (Indium Tin Gold Oxide Nano). The outermost layer is a quartz glass protective layer with a thickness of 0.0015mm.

When a user capacitive touch screen, due to the electric field of the human body, your fingers and face to form a coupling capacitance, because the work plane to have a high-frequency signal, so the current on the fingers is very small, respectively, the current from the screen in the electrodes at the four corners of the electrodes, theoretically through the four electrodes with the finger of the current to the four corners of the distance is proportional to the controller through the precise calculation of the ratio of the four currents to arrive at the position. It can achieve 99% accuracy and the response speed is less than 3ms.

What Is Capacitive Touch Screen Technology?

Capacitive touch screen technology Works by utilizing human current sensing. This capacitive touch screen is a four-layer composite glass screen. The inner surface and the middle layer of the glass screen are coated with a layer of ITO. The outermost layer is a thin protective layer of silica clay glass. When the finger touches the metal layer, the user forms a coupling capacitor with the surface of the touch screen due to the electric field in the human body.

The capacitor is a direct conductor of high-frequency current, so the finger draws a small current from the contact point. The current flows from the electrodes at each of the four corners of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position of the contact point by calculating the exact ratio of the four currents.
In order to realize multi-touch on capacitive screens, it is necessary to increase the mutual capacitance electrodes. Simply put, the screen is divided into blocks, and a set of mutual capacitance modules are set up in each area to work independently. Therefore, the capacitive screen can independently detect the touch situation in each area, and simply realize multi-touch after processing.

Comparison OF Resistive Touch Screen And Capacitive Touch Screen Features

A Brief Analysis Of The Differences Between

To put it simply, a resistive screen is actually a sensor. Resistive screen operation, when the film and glass layers collide with each other, the current will have an impact, the chip according to the calculation of the data between the force and the current, assessing the screen that a position under pressure, make a response. It is also because the resistive screen is subject to force touch, so this principle leads to the resistive screen can only be a little touch, it is difficult to realize multi-touch. This principle also makes the resistive screen is mostly used in dusty, large temperature difference, need to wear gloves to operate the industrial harsh use of the scene.

Capacitive screen is actually the use of human current sensing work, can be understood as the need to touch the media with bioelectricity in order to touch. That is to say, capacitive screen is the use of the lower layer of the transmitter signal to the upper layer, when the upper layer is contacted by the conductor, the lower layer will be able to quickly receive the message and make calculations. The lower layer is able to quickly receive the message and make calculations. It determines where the finger is touching and reacts to it. It is precisely for this reason that capacitive screens can not only support multiple points at the same time, but also greatly improve the sensitivity of the hand when touching. Therefore, capacitive screens are mostly used in normal industrial applications without special needs.

1, touch sensitivity

Capacitive screen is the use of human current sensing work, so any non-conductive objects such as fingernails, gloves, etc. can not be recognized by the capacitive sensing system below the screen; resistive screen is working through pressure sensing, using any object touch can be, support stylus.

2, multi-touch feasibility

Capacitive multi-touch screen can be realized, depending on the way to achieve and the use of software; resistive screen multi-touch can not be achieved, unless the resistive screen reorganization and connected to the machine's circuit.

3, damage resistance

Capacitive screen is the outermost layer of the protective layer of silica glass, in the severe impact is likely to break; while the resistive screen is the outermost layer of the film, you need to press it down to reach the pressure of the sensing, and resistive screen to support the stylus, so that the screen is prone to scratches, you need to protect the film and a relatively more frequent calibration, but not easy to fall than the capacitive screen.

4, precision

Capacitive screen can theoretically reach a few pixels, but in practice, due to the limitations of the finger contact area, making it difficult for users to accurately click on the target of less than 1cm; while the accuracy of resistive screen reaches at least a single display pixel, which can be seen when using a stylus. Facilitate handwriting recognition, which helps to operate under the interface using small control elements.

5. Visualization effect

Both capacitive and resistive screens have good visual effects indoors, but the visual effects outdoors, especially under sunlight, show differences. The capacitive screen is better, but the resistive screen is less effective because of the extra screen level reflecting sunlight.

6, the degree of cleanliness

Capacitive screen to use the finger to touch, easy to leave stains on the screen, but because of its outermost glass layer, easier to clean; resistive screen support stylus or fingernail operation, not easy to dirty the screen.

7, environmental adaptability

Capacitive screen typical operating temperature between 0 ° to 35 °, the need for at least 5% humidity; and resistive screen operating temperature is not a specific value, but it has been confirmed that the resistive screen can be in the -15 ° C to +45 ° C temperature under normal operation, the resistive screen is not much of a requirement for humidity.

8, cost

Capacitive screen is more expensive, different manufacturers of capacitive screen than resistive screen is about 10% to 50% more expensive; and resistive screen is cheaper, some cottage machines on the market are mostly resistive screen-based.

9, power consumption

Capacitive screen is more power-consuming than resistive screen.

The End OF The Article

Touch screen is widely used in cell phones, tablet PCs, self-service ticketing machines, retail industry, multimedia applications, public information business query, industrial equipment and other fields, through the touch screen technology users only need to use their fingers to gently touch the picture or text on the display to achieve human-computer interaction operations. Touch screen technology is an interactive input technology with broad prospects for development, has now presented a diverse, multi-functional, large-screen trend, with the gradual development of touch screen technology, touch screen applications will become more and more widespread, the performance will be more superior. Finally summarized, in choosing the right industrial LCD screen and industrial touch screen, need to be based on the product's application environment, the application of the population and the product market decided. Usually through the cost, accuracy, damage resistance, environmental adaptability and other aspects to determine the capacitive touch screen and resistance touch screen in the choice.