1. 3M Touch Systems © 3M 2007. All Rights Reserved 3M CONFIDENTIAL ClearTek II Touch Screen

2. 2 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-Glare Electrode 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

3. 3 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.

4. 4 3M Touch Systems © 3M 2007. All Rights Reserved 3M CONFIDENTIAL Standard Touch Screen Configurations

5. 5 3M Touch Systems © 3M 2007. All Rights Reserved 3M CONFIDENTIAL Serial Number Label Information

6. 6 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

7. 7 3M Touch Systems © 3M 2007. All Rights Reserved 3M CONFIDENTIAL Scratch Resistance – Mohs Scale HardnessMineral Absolute Hardness 10Diamond1500 9Corundum400 8Topaz, Hardened Steel200 7Quartz, Garnet, 3M Capacitive Touchscreen100 6Orthoclase Feldspar, Glass, Iron Pyrite72 5Apatite, Knife Blade48 4Fluorite, Platinum, Iron21 3Calcite, Copper9 2Gypsum, Finger Nail, Gold, Silver2 1Talc1 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.

8. 8 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.

9. 9 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

10. 10 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