Ultra large format multi-touch projected capacitive touch technology

June 04, 2012 // By Julien Happich
Zytronic has developed an innovative, multi-touch solution capable to support 10 simultaneous touch points for large display formats such as those used in self-service, public use and industrial applications.

Like all of Zytronic's Projected Capacitive Technology (PCT) touch sensors, the multi-touch sensor solution uses a matrix of 10 micron diameter copper electrodes embedded within a thick, durable glass laminate which is both impact and scratch resistant.

Current alternative multi-touch solutions have certain drawbacks preventing them from being deployed successfully in self-service and industrial environments. Those using optical mechanisms, such as infrared (IR) or camera based systems, require an exposed bezel for housing the transmitter and receivers, leaving them susceptible to damage and a build-up of dust and dirt in the bezel recesses, which will affect long term performance. Likewise, existing projective capacitive multi-touch products, which primarily use Indium Tin Oxide (ITO), can only effectively detect a touch event through 1 or 2 mm of glass and are mostly limited to sub 22 inch sizes, both of which generally restricts their use to personal consumer devices and point of sales (PoS) terminals in supervised environments. Furthermore, ITO based sensors lack flexibility in that each new design or size requires a new set of photolithographic tools to be created, which can cost thousands of dollars, rendering them unsuitable for low to mid volume applications.

The ZXY200 multi-touch controller and its accompanying touch sensor have the potential for use in ultra large sizes. Initially, the company will be offering 22, 32 and 46 inch sensors, but the release of larger formats is anticipated later in 2012, and custom sizes will be possible in low volumes. The Zytronic product offers superior through glass performance and offers 10 independent points of touch with a 4 mm toughened protective front glass. It also works with gloved hands. Both of these features make it highly suited for a broader range of deployments.

This multi-touch solution has been designed to be plug and play compatible with Microsoft’s multi-touch capable operating systems - Windows 7 and the forthcoming Windows 8.It can also be used in conjunction with multi-touch