Capacitive Touch Panels
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 screen 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 screen panels are much different than resistive panels 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 screen 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 |
| 