Touch Screen has become very popular in our daily lives: cell phones, ATM’s, kiosks, ticket vending machines and more all use touch panels to enable the user to interact with a computer or device without the use of a keyboard or mouse. But did you know there are several uniquely different types of Touch Screens? The five most common types are: Resistive Wire Resistive, Projected Capacitive, SAW (Surface Acoustic Wave), and Infrared.
4 Wire resistive touch screen is the preferred solution for low cost applications. It consists of a conductive bottom layer (ITO Glass or Film) and a conductive top layer (ITO Film). The two layers are suspended by many very small spacer dots.
Projected Capacitive touch screen is similar to Surface Capacitive touch screen, but it offers two primary advantages: in addition to a bare finger, it can also be activated with surgical gloves or thin cotton gloves; and it enables multi-touch activation (simultaneous input from two fingers).projected capacitive touch screen is composed of a sheet of glass with embedded transparent electrode films and an IC chip, which creates a three dimensional electrostatic field.
5 Wire resistive touch screen is the preferred solution for applications requiring durability and reliability over time. Similar to the 4 Wire technology, 5 Wire touch screen also consists of a conductive bottom layer (ITO Glass or ITO Film) and a conductive top layer (ITO Film).
|Type||4 wire Resistive||5 wire Resistive||Surface Acoustic Wave||Projected Capacitive||Infrared|
|Durability||3 year||5 year||5 year||5 year||5 year|
|Touch||Finger, gloved fi nger, or stylus pen||Finger, gloved fi nger, or stylus pen||Finger, gloved fi nger, or stylus pen||Finger, gloved fi nger, conductive stylus||Finger, gloved fi nger, or stylus pen|
|Аdvantages||s Low cost (for small sizes), can detect any object||Low cost (for small sizes), can detect any object||Can be deployed to a curved surfaces||Excellent image clarity More resistant to scratching than surface capacitive touch screens Resistant to surface contaminants and liquids- dust, oil, grease, moisture Multi-touch (two-touch)||No overlay, Superior image, can detected any object which blocks|
|Disadvantages||High costs for large areas, very sensitive to scratch, low fidelity and reduces the visibility of the screen||High costs for large areas, very sensitive to scratch, low fidelity and reduces the visibility of the screen||Delicate, expensive and sensitive to scratch||Must be activated via exposed finger, thin surgical or cotton gloves, although some PCAP windows (like those used by AbraxSys) can be triggered by a heavy gloved hand||Expensive, detection placed above screen and sensitive to ambient light|