3M 17-8091-206 / 98-0003-2552-6

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Product Description:

3M 17-8091-206 SCT3250 Microtouch Surface Capacitive Touch Screen

Product Drawing:

Applications:

3M 17-8091-206 is widely used in slot machine, aviation system, boat & marine electronics.

Our Advantages:

• We are a manufacturer with over 3000 square meter factory.

• 20000⁺ daily procution capacity

• Strict quality system and teting laboratory to ensure the quality.

The items availabe for 6.71 inch: 17-8091-203, 17-8091-204, 17-8091-205, 17-8091-206, 17-8091-221, 17-8091-223, 17-8091-226, 17-8091-227, 17-8091-218. Welcome for your inquiry.

Self-Capacitance 

In this implementation, the electronics measure the current on each electrode to ground and therefore is called “self-capacitance”. There are two options for how the system can detect touch — multi-pad construction or rows and columns [see figures 3 and 4]. In a multi-pad construction, each electrode, or “pad”, is individually addressable by the electronics requiring an individual connection between the electrode and the controller. This allows multi-pad selfcapacitance to support greater than one touch, but given that each pad must be individually addressed, it makes the implementation of this solution for screens greater than 3.5 inches very challenging. In a row-and-column construction, each row and column is an electrode and therefore is individually addressed by the controller. Even though the intersection of a row and column represents a unique coordinate pair, the electronics are not able to measure each individual intersection as they can only measure each electrode. This limits row and column self-capacitance implementations to single and dual touch detection where “ghost” points can be a problem. Ghost points are the result of imaginary or false row and column intersections in locations other than the touch location [see figure 5]. To sense touch in a self-capacitance implementation, the electronics scan through each electrode and measures the amount of current on each electrode to establish a steady-state current. When a finger or grounded conductive stylus approaches the screen, they couple to the electrodes and increase the current draw as it creates a path to ground. By determining which row and column is closest to the touch location, and using interpolation for higher precision, a controller can determine the location of a touch.

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