Touch Screens

    The attributes that separate the Texzec touchscreen from the surface acoustic wave type (SAW), are the following:1) Insensitive to liquids on the surface.2) Screen can be as thin as desired.3) Two Texzec sensors on the same screen glass.4) Texzec sensor and projected capacitance sensor on the same or separate sheet of glass.5) Capable of edge to edge touch sensitivity.6) Sensitivity selection depending on the environment.7) Easier to mount to a display. Multiple sensors on the same or separate substrate allows for redundancy which can be important for mission critical applications or for enhanced customer satisfaction, as is the ability to use any type of glove in any weather. In addition, the sensors are inherently low EMI and insensitive to ionizing radiation.

    How Texzec Touch Screens Work

     

    Ultrasonic waves in touch screen glass come in two flavors known as modes. They can cause transverse motion in the touch screen like this known as shear modes

    Or they can cause motion like waves on the surface of a liquid know as Lamb Waves

    When a particular pair of Lamb modes are present and the touch screen is thick enough, they will combine to make a so called surface wave (SAW).

    All of these waves can be created at the edge of the touchscreen by ceramic transducers, and they can be directed across the touchscreen by means of an array. This array consists of a series of echelons arranged in angle, width and spacing to generate a desired sensing wave mode from a transducer generated source mode.

    Each type of wave and its order has a unique response to a finger touch, and anything else on the touchscreen surface as a glove or fluid. It was a Texzec innovation that if the angle of the echelons, their placement and alignment are done correctly, the array of echelons will generate pretty much any type of sensing wave mode and order. That is you could create an ultrasonic touchscreen with selectable characteristics. In practice we select for high touch sensitivity including gloves, with operation in wet conditions, for both thin and thick touch screen glass.

    Two arrays are all that are needed for a Texzec Touch Screen, because the wave modes we use efficiently reflect off a glass edge.

    This frees up the opposing edges for a second pair of arrays and transducers for redundancy increasing touchscreen reliability if needed. In addition the wave modes are not affected by the conductive coatings required for projected capacitive touch systems. This allows Texzec to put a capacitive touch system on the back surface to combine our ultrasonic touch sensor with a capacitive touch sensor for redundancy and the best of both technologies.

    Address

    1400 Chisholm Trail Rd.
    Suite F
    Round Rock, Texas 78681

    Email

    Sales@Activemetal.com

    Support@Activemetal.com