What is the difference between a resistive touch screen and a capacitive touch screen

To put it simply, the sensitivity is different, the resistive type is not as sensitive as the capacitive type, and it needs to be used more forcefully than the capacitive type to change the resistance value (impedance), while the capacitive type only needs to be gently pressed or approached to change the capacitor capacity (capacitive reactance).

The resistive touch screen will respond only when touched with hardware (and it is very difficult to press), and the capacitive screen can respond when you press the flesh of your fingers and supports multi-touch.

1. Touch sensitivity.

Resistive touch screen: It is necessary to use pressure to make the layers of the screen come into contact, and you can use your fingers (even if you are wearing gloves), fingernails, stylus, etc. Stylus support is important in the Asian market, where gesture and text recognition are valued.

Capacitive touchscreen: The slightest contact from the surface of a charged finger activates the capacitive sensing system underneath the screen. Non-living objects, fingernails, gloves are not effective. Handwriting recognition is more difficult.

2. Accuracy. Resistive touchscreen: accurate to at least a single display pixel, visible with a stylus. It facilitates handwriting recognition and facilitates operation in an interface using small control elements.

Capacitive touch screens: Theoretically accurate to a few pixels, but in practice limited by the contact area of the fingers. So much so that it is difficult for users to accurately click on targets that are less than 1cm2.

3. Cost. Resistive touchscreen: very inexpensive.

Capacitive touch screens: Capacitive screens** from different manufacturers** are 10% to 50% more expensive than resistive screens. This extra cost doesn't matter for a flagship, but it can be prohibitive for mid-priced phones.

4. Damage resistance.

Resistive touch screen: The fundamental characteristics of the resistive screen determine that the top of the resistive screen is soft and needs to be able to be pressed. This makes the screen very susceptible to scratches.

Resistive screens require a protective film as well as comparatively more frequent calibration. On the plus side, resistive touchscreen devices that use a plastic layer are generally less vulnerable to damage and less likely to break.

Capacitive touch screen: The outer layer can be glass. Although it is not indestructible and has the potential to shatter under severe impact, the glass is better coped with everyday scratches and stains.

Of course the capacitance is good. Capacitive touch is sensitive, supports multi-touch, the representative of the resistor is nokia, and the screen is very insensitive.

The resistive screen should have pressure, and the capacitive screen should not be used.

1. Principle comparison:

1.Resistive touch screen.

The main part of the resistive touch screen is a resistive film screen that is very compatible with the surface of the display, which is a multi-layer composite film, which uses a layer of hard plastic flat plate or glass as the base layer, and the surface is coated with a transparent oxide metal (transparent conductive resistance) conductive layer, which is covered with a layer of outer surface hardening, smooth and anti-rub plastic layer, and its inner surface is also coated with a layer of coating, and between them there are many small (less than 1 1000 inches) transparent isolation points to separate the two layers of conductive layer insulation.

When the finger touches the screen, the two conductive layers are in contact at the touch point, and the resistance changes, generating signals in the x and y directions, and then sending them to the touch screen controller. The controller detects this contact, calculates the position of (x,y), and then behaves in a way that simulates a mouse.

2.Capacitive touch screen.

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 (coated conductive glass), the outermost layer is a thin layer of silica glass protective layer, ITO coating as the working surface, four electrodes are drawn out at the four corners, and the inner layer ITO is the shielding layer to ensure a good working environment. When the finger touches the metal layer, the finger draws a small current from the contact point due to the formation of a coupling capacitance between the human electric field, the user and the surface of the touch screen, which is a direct conductor for high-frequency currents. 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, and the controller obtains the position information of the touch point through the accurate calculation of the proportion of these four currents.

2. Comparison of advantages and disadvantages:

1.Resistive touch screen.

Advantages After years of application and development, the technology has been quite mature.

l** is lower and cost saving.

l Easy to use, any contact can be used.

l Never drift.

l Work in an environment completely isolated from the outside world, not afraid of dust, water vapor and oil stains.

Disadvantages: Because the outer layer of the composite film is made of plastic, it may scratch the touch screen if you use too much force or touch with a sharp object.

l Must be pressed to operate.

l Currently only supports single touch.

2.Capacitive touch screen.

Advantages l The light transmittance and clarity of the capacitive touch screen are better than those of the four-wire resistive screen, but they cannot be compared with the five-wire resistive screen.

l It can currently support multi-touch.

l Capacitive touch is made of glass, which has a long service life.

l Just touch, no need to press to operate.

Disadvantage l The human body becomes a part of the line, so the drift phenomenon is more serious.

l Resistant to most environmental pollutants.

l Wearing gloves does not work.

l Frequent calibration is required.

l Not suitable for metal cabinets.

l When there is inductance and magnetic inductance in the outside world, it will make the touch screen fail.

l Human touch is required, if the screen is small, it is difficult to touch.

The upstairs is very nice. Said.

Resistive touch screen (touch panel of resistance), also known as resistive touch panel, is an inductive liquid crystal display device that can receive input signals such as contacts, when touching the graphic buttons on the screen, customize the resistance screen, capacitive screen, find the full touch Lu Shuyun, she is the number of 183, the middle is 2005, the back four digits are 9375, the haptic feedback system on the screen can drive various connection devices according to the pre-programmed program, which can be used to replace the mechanical button panel, And through the LCD screen to create vivid audio and video effects.

Capacitive touch screen technology works using the body's current sensing. 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 silicone glass protective layer, the laminated ITO coating is used as the working surface, four electrodes are drawn out at the four corners, and the inner layer ITO is the shielding layer to ensure a good working environment. When the finger touches the metal layer, due to the electric field of the human body, the user and the surface of the touch screen form a coupling capacitance, which is a direct conductor for high-frequency currents, so the finger draws a small current from the contact point.

This current flows out of the electrodes on the four corners of the touch screen, and the current flowing through these four electrodes is proportional to the distance of the finger to the four corners, and the controller derives the position of the touch point by accurately calculating the proportion of these four currents.

Looking at the application environment, the resistive screen is suitable for the industrial environment.

The capacitive screen is suitable for self-service terminal equipment, inquiry machine, cash register, calling machine, etc

Each has its own use, depending on what you use it in.

It can be said that each is good in its own way. The capacitive screen supports multi-touch. Resistive screens are not supported.

Depending on the use environment, if it is too humid, don't capacitor.