Many
people believe that there are certain touchscreens that detect heat.
For example, an iPhone’s touch screen will detect interactions with
a finger but will not detect activity from a stylus pen. However,
it’s not heat which these kinds of touch screens detect but it is
the conductibility of an object; something that capacitive touch
panels specialize in.
Capacitive
touch panels come in two types—surface capacitive and projected
capacitive. Projected capacitive screens are the second most widely
used sensing technology for touch-sensitive devices. These touch
screens contain a layer that stores electrical charge which transfers
to the user as actions through the touchscreen are performed.
As
the electrical charge is transferred to the user, sensors calculate
the relative differences in charge and thus detects the finger’s
location on the screen. The screen detects conductive material like
your finger and not nonconductive material such as stylus pens and
gloves.
One
advantage of capacitive touch panels is that they transmit more light
compared to resistive touch panel screens. This allows them to
produce a clearer image than the resistive system. Additionally,
although more expensive than the resistive system, capacitive
touchscreens are newer and more common. Plus, they provide excellent
finger touch detection and better durability.
This blog clarifies that capacitive touch panel does not detect heat but it is the conductivity of a human especially the bare finger to work by touching the screen display of the device. The author gives the 2 types of capacitive touch panels, the surface capacitive and projected capacitive. The surface capacitive technology is suitable for large sizes monitor that gives a high resolution and high response speed. It is structurally tough as it is made of only one sheet of glass so that it gives a high visibility. The projective capacitive touchscreen is the second widely used sensing technology. The internal structure of the touch panels consists of a substrate incorporating an IC chip for processing computations, over which is a layer of various transparent electrodes that positioned in specific patterns. The surface is covered with an insulating glass or plastic cover. When a finger approaches the surface, electrostatic capacity among multiple electrodes changes simultaneously, and the position were contact occurs can be identified precisely by measuring the ratios between these electrical currents. That’s the difference between the types of capacitive touch panels.
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