What Differences Between Capacitive Touch and Resistive Touch?

We often have two touch methods in industrial screens, namely capacitive touch and resistive touch. What is the difference between them?

First of all, let’s learn the basic principles of industrial flat panel resistive touch and capacitive touch.

The Working Principle:

1) Resistive Touch: Only 1 Layer Glass Backing Panel

In electrical engineering, a resistive touchscreen is a touch-sensitive computer display composed of two flexible sheets coated with a resistive material and separated by an air gap or microdots.

There are two different types of metallic layers. The first type is called matrix, in which striped electrodes on substrates such as glass or plastic face each other. The second type is called analogue which consists of transparent electrodes without any patterning facing each other.

Resistive touchscreens typically have high resolution (4096 x 4096 DPI or higher), providing accurate touch control. Because the touchscreen responds to pressure on its surface, contact can be made with a finger or any other pointing device, with precise touch positioning.

Applications: restaurants, factories, and hospitals due to their high tolerance for liquids and contaminants. A major benefit of resistive touch technology is its low cost.

Additionally, as only sufficient pressure is necessary for the touch to be sensed, they may be used with gloves on, or by using anything rigid as a finger substitute.

Disadvantages: include the need to press down, and the risk of damage by sharp objects. Resistive touchscreens also suffer from poorer contrast, due to having additional reflections (i.e. glare) from the layers of material placed over the screen. It does not support multi-touch, and the sensitivity is not as high as that of a capacitive screen.

2) Capacitive Touch: Outer layer is tempered glass, explosion-proof.

Regular indoor capacitive touch does not have Protective Anti-reflective Coating and Bonding Layer.

Anti-reflective: Outdoor, High Brightness, Big Sunshine Environment

Optical Bonding: High Water Vapor Environment, or High Temperature

A capacitive touchscreen panel consists of an insulator, such as glass, coated with a transparent conductor, such as indium tin oxide (ITO). As the human body is also an electrical conductor, touching the surface of the screen results in a distortion of the screen’s electrostatic field, measurable as a change in capacitance.

Applications: It is therefore most often used in simple applications such as industrial controls and kiosks.

Unlike a resistive touchscreen, some capacitive touchscreens cannot be used to detect a finger through the electrically insulating material, such as gloves. This disadvantage especially affects usability in consumer electronics, such as touch tablet PCs and capacitive smartphones in cold weather when people may be wearing gloves. It can be overcome with a special capacitive stylus or a special application glove with an embroidered patch of conductive thread allowing electrical contact with the user’s fingertip. Since capacitive touch changes with temperature, humidity, or grounding conditions, its stability is not as good as resistive touch, and drift may occur.

Comparison:

The Difference between the Advantages and Disadvantages of Resistive and Capacitive Touch

HMIvision, the manufacturer of Industrial Panel PC, Touch Monitor, and BOX/Mini PC.

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