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Touchscreen products
Introduction to products with touchscreen
Both Resistive and Capacitive touchscreen solutions are used for our products. Please visit our
website to find your exact type number and then determine if it uses Resistive or Capacitive.
If you have a customized or tailored product, please check the specifications in this manual or
third-party specifications from your supplier.
Capacitive Touchscreen
Capacitive touchscreens operate using oscillator circuits that are located in each corner of the
glass overlay and measure the capacitance of the area to be "touched". Depending on where the
user touches the overlay, the oscillators will vary in frequency. A touchscreen controller then
measures the frequency variations to ascertain the coordinates of the person's touch. This glass
overlay has a coating that stores the charge deposited over its surface electrically. It will not
operate with either a gloved hand or with a mechanical stylus.
CAPACITIVE - Brief Specifications
Subject
Construction
Positional Accurancy
Touch Contact Requirements
Enduarance Tested
Cleaning
Liquid Resistance
Light Transmission
Resistive Touchscreen
It generally uses a display overlay composed of layers, each with a conductive coating on the
interior surface. Special separator "dots" are distributed evenly across the active area and
separate the conductive interior layers. The pressure from using either a mechanical stylus or
finger produces an internal electrical contact at the "action point" which supplies the controller with
vertical and horizontal analog voltages for data input. The resistive touchscreens are anti-glare to
reduce reflective shine intensity, which will slightly diffuse the light output throughout the screen.
Resistive technology activation can be initiated by; a gloved hand, fingernail, mechanical stylus
or an ungloved finger.
RESISTIVE - Brief Specifications
Subject
Construction
Positional Accurancy
Touch Activation Force
Expected Life Performance
Chemical Resistance
(Exposed for one hour)
Light Transmission
Touchscreen
IND100110-1
Top: ClearTek protective overcoat protects the sensors and increase durability.
Inside: Electrode X/Y grid pattern and conductive coating.
Bottom: Glass and conductive coating.
Small amount of voltage is applied to the four corners for measuring X and Y coordinates of the touch point.
Reported touch coordinates are within 1.0% of true position. (Based on viewing area dimensions)
3 ms for finger input.
More than 225 million touches in one location without noticable degradation to the surface.
Water, isopropyl, alcohol, and similar non-abrasive cleaners.
Liquids on screen does not impede touchscreen performance.
Up to 88% at 550 nm; dependant on specific surface finish chosen.
Top: Polyester with outside hard-surface coating with clear or anti-glare finish.
Inside: Transparent conductive coating.
Bottom: Glass substrate with uniform conductive coating.
Top and bottom layers separated by separator dots.
Standard deviation of error is less than +- 0.080-inch (2mm).
Typically 57 to 133 g
More than 35 million touches in one location without failure, using a stylus similar to a finger.
Acetone, Ammonia-based glass cleaners, Common food and beverages,
Hexane, Isopropyl alcohol, Methylene chloride, Methyl ethyl ketone,
Mineral spirits, Turpentine
Typically 75% over visible light spectrum.
Details
Details
1
INB100026-1 (Rev 9)
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