ClearTek II Touch Screen © 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 © 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 no sharp metal edges can do not contact or rub against the outside insulating layers of the tail. © 3M 2007. All Rights Reserved 3M CONFIDENTIAL

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

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

Scratch Resistance – Mohs Scale 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. Hardness Mineral Absolute Hardness 10 Diamond 1500 9 Corundum 400 8 Topaz, Hardened Steel 200 7 Quartz, Garnet 100 6 Orthoclase Feldspar, Glass, Iron Pyrite 72 5 Apatite, Knife Blade 48 4 Fluorite, Platinum, Iron 21 3 Calcite, Copper 2 Gypsum, Finger Nail, Gold, Silver 1 Talc © 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. 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. © 3M 2007. All Rights Reserved 3M CONFIDENTIAL

Linearization Non-linear areas of the touch screen Raw glass Conductive coating Resistance of the border pattern © 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. Measured Data X&Y Ideal Data X&Y Before linearization After linearization © 3M 2007. All Rights Reserved 3M CONFIDENTIAL