5 Operating Principles of Resistive Touch Screen

https://www.youtube.com/watch?v=2X30LkAtHjg

 

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Mr Touch screen talks about the Operating Principle of Resistive Touch Screen in this youtube video.

 

Video Transcripts

Touchscreen is basically a data input device.

It is a screen which responses to a touch.

There are various types of touch screens
which work according to different
physical principles.

List of Resistive Touch Screen Monitors & Displays – Faytech North America

Let’s consider the operating principle of a resistive
touchscreen.

A resistive touchscreen consists of a glass board and the
flexible plastic membrane.

Both the board and the membrane are covered with
resistant coating. The space between the
glass and the membrane is filled with
micro insulators which are evenly
distributed along the screens active
area.

They insulate conduction surfaces
when you touch the screen. The board in
the membrane close up the controller
and registers change in resistance with the
help of analog to digital converter.

That converts into coordinates of the
touch.

There are 5 & 8 wired touch screens. They improve tracking accuracy
but do not increase reliability.

Initially all four electrodes are asked
and the membrane is pulled by the
resistor up to plus 5 volts membrane.

Voltage level is constantly tracked by
the analog to digital converter when the
screen remains untouched. The voltage
equals 5 volts as soon as the screen is
touched.

The microprocessor detects the
membrane voltage change and starts
calculating coordinates

A 5 wire screen is more reliable as the membranes
resistive coating is replaced with a
conductive layer.

A 5 wire screen continues working even with a cut
membrane. The back glass has a resistive
coating with four electrodes along the
corners.

Resistive touchscreens are cheap
and have a maximum pollution resistance.

Resistive screens respond to a touch by
any smooth solid object.

This can be a hand a feather credit card or scalpels
blunt and one of the disadvantages of
resistive screens is their low light
transmittance .

No more than 85% for five
wire models and law parameters for four
wire models.

They also have a short
lifespan normal than 35 million touches
per one point.

These resistive screens are used in
payment terminals information kiosks
sales automation equipment handheld
computers and operator boards in the
industry.

Visit Faytech North America for their list of resistive touch screen and other touch screen monitors if you are interested.

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