In terms of overall integration, touch sensors and their related components are probably the most seamless technologies. From automated teller machines (ATMs), cell phones, and video games to test-and-measurement and medical equipment, touch interfaces can be found nearly everywhere. And unless they’re confusing or inoperable, they’re taken for granted by most users.
In a brief period, touchscreens have evolved beyond the simple, single-button entry format. State-of-the-art components offer multifunction buttons, sliders, scrolling, simultaneous inputs, and unique human gestures. With each new interface variation offering more functionality, some users may ask where we go from here and what’s next.
Price Slice
Like every sector, lowering future costs is a top priority in the touch-sensor arena. “In the area of touchscreens, performance and cost reduction are the two areas where customers are driving most aggressively for innovation,” says Eric Itakura, director of marketing and business development at Leadis Technology.
“Fundamentally reducing the cost of the touch sensor itself by simplifying its construction or reducing the number of required ITO (indium tin oxide) layers, without giving up functionality and performance, is a potential game-changer in this market,” adds Itakura.
“Most consumer electronics companies are subject to the current economic downturn, thereby driving the search for competitive technologies,” says Chris Ard, director of marketing at Atmel’s touch technology division. “The main challenges are differentiating products and price. We are finding that the demand for low-cost and reliable touch-sensing controls remains strong.”
Present economic circumstances and resolutions aside, the quest for the lowest-cost yet highly reliable and functional touch sensors continues unabated.
Room For Innovation
Where will we see the greatest focus of touch-sensor innovation in 2009? Size reductions? Greater functionality? According to Ard, achieving a richer user interface will come out of innovations in X-Y touchscreens, especially multi-touch interactions.
For this, Ard sees capacitive touch-sensing technology surpassing resistive touchscreens in terms of reliability. Compared to resistive components that install on the front of a panel and require multiple layers with air gaps, he says, “Capacitive sensing controls situate behind a cover and are consequently more resilient across all operating environments.”
In addition, when it comes to reducing size and weight, Ard said the thinner structure of a single-layer capacitive sensor makes it easier to implement the structure and requires less backlighting. In contrast, Leadis’ Itakura foresees enhanced robustness against LCD electromagnetic interference (EMI) and multi-touch gesture recognition as just two examples of performance-related innovation in the capacitive-touch segment.
“Even though the consumer market has only recently started to adopt capacitive touch technology, the competition among end products is still fierce,” says Itakura. “For touch-button, slider, and scroll applications, the innovation will come in the form of functionality integration.”
Markets And Challenges
The market for touch sensors is pretty wide, and predicting where the greatest demand will come from may be tricky. “Every touch-sensor market is interesting right now, basically everywhere there is a button. The technology is spreading quickly into automotive designs, children’s toys, and games, and the design criteria are very similar across most segments. But cost drivers vary, particularly in high-volume applications,” says Ard.
“Buttons and scrollers are ubiquitous in consumer and mobile applications. Touchscreens in any volume have only been in mobile devices to date, but are moving very fast at the moment and are likely to become the interface of choice for over-display applications in the coming years,” adds Ard. “Manufacturers are now working with smaller engineering teams, so we (Atmel) find ourselves increasingly supporting prototype developments.”
“For touchscreens, the consumer market, mobile handsets in particular, is the most aggressive in driving innovation. With lower barriers to consumer adoption and faster product cycle times, there’s little doubt in my mind that the consumer market has the great potential for innovation and growth for touchscreens in 2009,” says Itakura.
“Customers are not satisfied with the touchscreen solutions available now. This provides a challenge and opportunity for touch-sensor designers and manufacturers,” continues Itakura. “What’s necessary is a solution that takes into consideration the requirements of the entire system and addresses the full range of performance parameters, including resolution, accuracy/linearity, data rate, and multi-touch, all in the most cost-effective and streamlined way.”
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