Capacitive Touch Screens

Capacitive Touch Screens are all-glass panels with a transparent metallic conductive coating. electrode pattern printed along the edges which distributes a low voltage field over the conductive layer. So when a finger touches the capacitive touch panel and draws a minute amount of current to the point of contact, it creating a voltage drop. This current flow from each corner that is proportional to the distance of the touch point allows the location of the point of contact to be calculated by the controller.

Capacitive touch screens are much different than resistive touch screens in the way that they function. These screens are coated with those stores electrical charges. The coating is typically indium tin oxide, which allows the capacitive touch panels to continuality carry an electrical charge.

When the panel is touched, a charge is created and that specific information is sent to be processed. Unlike its resistive counterpart, capacitive touch screens must be touched by a human finger or some sort of conductive device being held by a human hand.

Specification of Touch Screen:
Electrical Maximum Circuit Rating 5V DC, 35mA
Insulation Resistance Maxtrix 20MΩ or more at 50V DC
  Analog 20MΩ or more at 25V DC
Dielectric Withstand 250V Rms (50-60Hz 1min)
Contact Bounce 30ms or less
Mechanical Actuation Force 10g to 100g
Linearity 1.5% or less
Life Expectancy 35,000,000 touches
Surface Hardness 3H or more
Glass Thickness 0.7mm, 1.1mm, 2.0mm, 3.0mm
Environmental Operation Temperature -10°C to + 60 °C
Storage Temperature -20°C to + 70 °C
Humidity 40°C , 90% to 95% for 240 hours
Optical Transparency ≥80% ± 2%
Structure Film to Glass

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