To truly understand the ShadowSense advantage, it’s important to explore other touch technologies, how they work, and what they can do.
Surface Wave Acoustic (SAW) technology operates by tracking sound waves above the human hearing range, also known as ultrasonic waves, to detect the location of touch points on the screen. This technology is perimeter-based, such as Infrared and Optical touch technology, but use sound instead of light for its calculations.
How does it work?
A SAW touch screen is made up of a glass sheet with three components: transmitting transducers, receiving transducers, and reflectors. The transmitting transducers produce ultrasonic waves that skim over the surface of the screen, get reflected and are captured by the receiving transducers.
When a soft matter like human skin, touches the screen, the surface acoustic waves are absorbed, and the receiving transducers do not register any input. Based on this lack of sound the sensors can calculate the location of the touch event.
|Surface Wave Acoustic (SAW)||ShadowSense™|
|Durable & long lasting||●||●|
|4K touch resolution||●||●|
|Object transparency detection||●||●|
|Touch response time||10 ms and up||under 10 ms|
Limitations of SAW Touch Screens
- Do not function with a pen or any other hard material
- High multi-touch latency
- Can malfunction when dirt, oil, or droplets stay on the screen
- Perimeter can’t be sealed from the environment and so attracts buildup in bezel
The ShadowSense Advantage
Surface Acoustic Wave has several issues that can impact performance and universal deployment. ShadowSense has significant advantages over SAW touch technology. Curious? – discover the ShadowSense advantage.