Touchscreen Technologies Explained

Touchscreen Technologies Explained

Touchscreen Technologies Explained


Touchscreens, touch screens, touch panels or touchscreen panels are display overlays, which are typically either pressure-sensitive (Resistive), electrically sensitive (Capacitive) or acoustically-sensitive (SAW-Surface Acoustic Wave). The effect of such overlays allows a display to be used as an input device, removing the keyboard and/or the mouse as the primary input device for interacting with the display’s content.

Such displays can be attached to computers or, as terminals, to networks. Touch screens are very resistant to harsh environments where keyboards might eventually fail. They are used in a wide range of applications and typical software will use on-screen buttons large enough to be pressed with the finger.

Resistive Touchscreens :

A Resistive touch screen panel is coated with a thin metallic electrically conductive and resistive layer that causes a change in the electrical current which is registered as a touch event and sent to the controller for processing.

Resistive touch screen panels are generally more affordable but can offer lower optical clarity, also sharp objects can damage the layer. Resistive touch screen panels are not affected by outside elements such as dust or water.

Resistive sensors can be operated with a finger, gloved hand or stylus.

Capacitive Touchscreens :

Capacitive Touch Screens are an all-glass touch screen with a transparent metallic conductive coating. An electrode pattern printed along the edges which distributes a low voltage field over the conductive layer.

When a finger touches the screen and draws a minute amount of current to the point of contact, creating a voltage drop.

The current flow from each corner is proportional to the distance to the touch point. The X/Y location of the point of contact is calculated by the controller and transmitted to the computer.

Capacitive sensors must be touched with a finger or a conductive device being held by a bare hand.

Projected Capacitive Touchscreens :

Projected Capacitive Touch technology works by accurately detecting and locating touch, sensing peak change in frequency. When a user touches the screen, capacitance occurs between the finger and the sensor grid, whereupon the sensor’s electromagnetic field is disrupted. The peak change in frequency is measured, and by determining which row and column is closest to this peak change in frequency, the position of the user’s touch can be very accurately determined.
PCT technology will detect a finger, conductive stylus and even a gloved hand, through glass thicknesses approaching 20mm. Yet, it ignores raindrops, leaves, dirt, ice, etc, making it ideal for self-service, industrial and public use. It is dependable, vandal-resistant and is practically immune to most types of physical, mechanical and chemical abuse.

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We Manufacture Industrial and Commercial Touchscreen Displays, Rugged IP65 PCs, Digital Signage & Rugged Computer Kiosks

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