Touch Screen Products - Hatteland HM 20T07 MIL User Manual

Touch screen products

Capacitive Touch screen
The 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 touch screens
operate by applying a small amount of voltage to each corner of the touch screen. When the
screen is touched by a human finger it draws a minute amount of current to the X,Y point of
contact. This location is calculated by the touch screen controller and transmitted back to the
computer connected to the touch screen controller.
CAPACITIVE - Brief Specifications
Subject
Construction
Positional Accurancy
Touch Contact Requirements
Enduarance Tested
Cleaning
Liquid Resistance
Light Transmission
Touch screen
IND100110-10
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.
Details
11
INB100005-8 (Rev 5)