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3 3M Touch Systems © 3M All Rights Reserved 3M CONFIDENTIAL ClearTek II - Tail Design Tail has 4 corner wires in a copper layer It also has a conductive shield – top & bottom This is connected to pin 3 of the controller This shield protects the 4 corners from EMI interference Insulation layer protecting the shield layers The insulating layers protect the shield from shorting out During integration, ensure sharp metal edges do not contact or rub against the outside insulating layers of the tail.
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
ClearTek II Touch Screen
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
ClearTek II Touch Screens - Construction
Proprietary Scratch-Resistant Top Coat
ClearTek Hard Coat with Anti-GlareElectrode Pattern
Conductive Coating
Glass
• All glass touch screen with transparent, thin-film conductive coating applied to surface
• A narrow electrode pattern is printed along the edge of the conductive layer
• Transparent glass hard coat with anti-glare properties is fused over the conductive coating
• Proprietary scratch-resistant top coat added• Tail design with solder-less connection and
taped strain relief
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
ClearTek II - Tail Design
•Tail has 4 corner wires in a copper layer• It also has a conductive shield – top & bottom
• This is connected to pin 3 of the controller• This shield protects the 4 corners from EMI interference
• Insulation layer protecting the shield layers • The insulating layers protect the shield from shorting out• During integration, ensure sharp metal edges do not contact or rub against the outside insulating layers of the tail.
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
Standard Touch Screen Configurations
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
Serial Number Label Information
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
Example of a Serial Number Label
Example of 14 digit serial number – NA170611300126 AAAA – NA17 – Machine ID # YY – 06 – Year Manufactured 2006 MM – 11 – Month Manufacture 11 or November DD – 30 – Day Manufactured 30 SSSS – 0126 – Sequence # for the day Manufacturing date – Nov 30, 2006; 126 touch screen of the day
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
Scratch Resistance – Mohs Scale
Hardness Mineral Absolute Hardness
10 Diamond 1500
9 Corundum 400
8 Topaz, Hardened Steel 200
7 Quartz, Garnet, 3M Capacitive Touchscreen 100
6 Orthoclase Feldspar, Glass, Iron Pyrite 72
5 Apatite, Knife Blade 48
4 Fluorite, Platinum, Iron 21
3 Calcite, Copper 9
2 Gypsum, Finger Nail, Gold, Silver 2
1 Talc 1
The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science.
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
How Does Capacitive Work
Voltage source (V) applied to surface Amplifiers (A1 – A4) measure current &
gain from the corners. Gain is in phase for all 4 corners correct ?
When a touch occurs a new circuit is introduced.
Current is drawn from the touch screen, through the person, to ground.
The Ratios of the current in each corner is used to calculate the position of the touch.
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
Linearization
Non-linear areas of the touch screen Raw glass Conductive coating Resistance of the border pattern
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3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
Linearization Process
Linearization corrects non-linearity of the glass, conductive coating process, electrode pattern process
Linearization compares measured data points to ideal data points.
Comparison generates correction coefficients for X & Y position.
Correction coefficients are stored either in the controller or with the touch screen.
Each touch screen has unique correction coefficients, Novram or mated controllers should not be separated from the touch screen it was paired with.
Before linearization
After linearization
Measured Data X&Y
Ideal Data X&Y
