Hatteland Display 20 inch - HM 20T07 MIL-H - Manual (Page 11)

11
IND100110-10
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 Details
Construction 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.
Positional Accurancy Reported touch coordinates are within 1.0% of true position. (Based on viewing area dimensions)
Touch Contact Requirements 3 ms for finger input.
Enduarance Tested More than 225 million touches in one location without noticable degradation to the surface.
Cleaning Water, isopropyl, alcohol, and similar non-abrasive cleaners.
Liquid Resistance Liquids on screen does not impede touchscreen performance.
Light Transmission Up to 88% at 550 nm; dependant on specific surface finish chosen.
Touch screen products
Touch screen