Types of Touch Screens

Types of Touch Screens
Touch screens come in many varieties. In this article, you will learn about Surface
capacitive, Projected capacitive smart film pdlc, Surface Acoustic Wave, and Planar. These types of
touch screens are used in a variety of different devices. This article also provides
some examples of products that use touch screens.

What is Touch Screen Technology? - GeeksforGeeks
Projected capacitive
Projected capacitive touch screens use a similar technology to conventional
capacitive touch screens ฟิล์ม ส มา ร์ ท เท ค. These touch screens work by combining two sensing
arrays with a drive line. Electrical currents flow along the drive line, and the
controller determines when the touch sensor is in contact with a finger or other
object. The controller sends these electrical currents to different layers of the touch
screen and creates an electrical field with nodes.
Unlike conventional touch screens, projected capacitive technology is very robust
and durable. It has multiple features and can be easily integrated into any
embedded application. It also features flexible mounting options. Finally, it is
completely sealed, which allows it to be used in public settings without worrying
about dust or water damage.
Surface Acoustic Wave
There are many types of touch screens available. Surface Acoustic Wave is a form of
touch screen technology that uses ultrasonic waves to detect a finger’s touch event.
The touch event is then relayed to a system controller to take action. Since this type
of touch screen technology does not use any layers or metallic parts, it offers the
highest image clarity and the highest light transmission. A finger or stylus can be
used to detect a touch event.
To implement SAW technology on touch screens, the system must have two
transducers placed on the glass surface. The transmitting transducer sends out the
waves that travel along the edge of the touch screen panel. These waves are
reflected back toward the receiving transducers, which then converts them into an
electrical signal.

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Planar
Planar touch screens are ideal for a variety of environments, including hospitality
and retail. Their zero bezel design provides 100 percent touch screen surface area,
making them easy to clean and visually appealing. They feature a 100mm VESA
mounting pattern and VGA and DVI video inputs. In addition, they come with built-in
speakers and a two-port USB hub.
Planar touchscreens have two layers: a conductive and a non-conductive layer. The
top layer is typically a PET film that is hard-coated to resist scratches. The bottom
layer may be glass, and both are coated with ITO. To help prevent electrical arcing,
the layers are separated by printed dots. The touch screen is then activated by a
controller that provides voltage to the unit. Depending on the application, the touch
screen may be combined with a display.