Hello my name is Chris Todd and I am director of marketing for touch products. Originally we were quantum research group, more recently we are a part of ATMEL Corporation but in total we have over 13 years of experience in the area of capacitive touch sensing. This represents thousands of designs and many tens of millions of chips in the field. Touch screens are rapidly becoming accepted as a user interface of choice. They enrich the user experience and of course they provide more place for bigger brighter display. Resistive touch is the most common type of touch screen this is found quite commonly in games consoles, portable navigation devices, cell phones and many other products. Resistive touch screens have a number of disadvantages including the fact that they are quite easily damaged. Since they sit on the front surface of the device and also they have some optical disadvantages, since they absorb and scatter some of the light. There has been quite a fast evolution in touch products since the mid 1990s. They started out in the area of buttons, moved to sliders wheels onto low resolution touch surfaces and more recently its pointed the way to capacitive touchscreens. These work from behind the front cover. In this case you can see we have a sensor stuck to the back of the front cover and a single driver chip with TWI interface to connect to the host. More recently over the past year or so the evolution of touchscreen has gain some momentum. The next generation of touchscreen driver chips is well developed. They have covered the territory between single touch and genuine multi touch they uniquely report the position of two fingers on the touch surface and also they can recognize and report a range of gestures which can be used to shortcuts for user interface. Let me show you how it works on the screen you can see a representation of the surface where the day to from the chip. As I bring my finger in towards the touch surface you can see that finger is detected and as I move around screen it tracks of course in this case we can also track one, two, three, four or more touches and not only that we can also do things like we can shape on the surface or began to develop simple gestures for example a swipe gesture.

In this visualization software its easier to see how a finger can be tracked on the touch screen so you can see it follows my finger around as I move across the screen also If I put two fingers on the screen you can see I can track each other and they are genuinely independent touches also if you look closely at the screen you will see as I prep touch and then press could it gives the size and depth of the touch in the screen too this is also the case that it works with two fingers and of course a different size digit will give a different result. In this next visualization screen we can demonstrate some gestures, which are embedded in the chip in this case, you can see the flick and the tab gesture in action .Now I move my finger down the screen you can see, and then the other direction. These are interpreted and reported by the chip .also the chip can read and drive a range of auxiliary devices a particular interest in touch screens are devices like four sensors and hepticaptuators but also in user interface its often useful to be able to drive LEDs and the ATMEL chip can do this. in the future the device will recognize and track and increased number of touches limited really only by the number of fingers and the size of the screen we also will embed the ability to recognize shapes. In any good design it’s important that the interface is robust. ATMEL have developed many advanced power algorithms over the years in very difficult environments for example automotives and wide goods where it’s crucial that mission critical applications are compromised. All of the techniques are based on the charge transfer process to collect the capacitive information from the surface this software is a great signal to voice ratio making the base line design easy and helping the whole process. In addition to the more advance user interfaces ATMEL also offers single-touch touch screens these are lower costs and use an inexpensive silicon chip. The ATMEL proprietary single layer sensor design is also key in producing a lower cost product over all this product can also have better optical properties because of the single layer nature of the design. These are useful for simple interfaces such as buttons and slider’s wheel right through to the medium complexity user interfaces. All of that touch screen technology is based on the industry leading AVR. The performance of the AVR under pins all of that technology in touch screens. We utilize the peak or power feature and combine with our advance controls and sleep mechanisms. We can provide bigger advantages for battery-operated devices. The devices are easy to use they just wake up and work there is no user calibration needed and the interfaces are event driven this means that the return and reports activity to the system host when is a touch on the surface providing a low overhead. In summary ATMEL provides a range of touch screen controllers useful for many applications and available at various price points from the simplest single touch device to the genuine multi-touch devices, they can work for a range of interfaces. We also provide visualization software and debugging tools these help with your project. We can offer reference designs for the sensors and of course we will help with implementation in your project. Thanks for listening.