The Cost of Missing Touch: From Glass Interfaces to Piezo Haptics, Rebuilding Certainty in Digital Interaction

1.The Tactile Crisis in Digital Interfaces
2.Perception to Vibration: Piezoelectric Shift
3.Where Haptic Precision Really Counts
4.Next Layer: AI-Adaptive Haptics and Invisible Interfaces.
5.Conclusion

The Tactile Crisis in Digital Interfaces
Glass is all over now. Smartphones, car dashboards, home appliances and medical devices, they all have what is known as a smooth featureless surface. It looks clean and photographs well. However there is a problem with it. Nothing does it tell you.
The physical buttons have never served two purposes at a time. They allow you to act and it is what they confirm-the act. You press a button, it makes a clicking sound and your brain forms the thought: done. This is closed less than 50 milliseconds. No second-guessing and no repeat press.
However, the loop was interrupted with touch screens.
On a glass surface, when you tap the surface, nothing can move. A change of color may be flashed on the screen. A sound might play. But no test is made physically. The brain poses a simple question, did that register? on which one no immediate answer is made. So it waits. Or it taps again. Or look the screen away from the road.
A visual inspection of the center console during 1 second in a vehicle at 100 km/h triggers a movement of the vehicle of meters without any attention of the driver. The wrong control can determine a severe mistake: in a surgical console a hesitant double-tap on the incorrect control may be a serious mistake. Uncertain input in a factory panel brings about variance and risk.
Smart cabins, connected home and industrial HMI panel are all converging to fully-touch operation. Fewer physical controls. More flat surfaces. Engagement in more open feedback loops. So haptics needs to bear the load that buttons bear.

Perception to Vibration: Piezoelectric Shift
The majority of the population is familiar with haptics referring to the vibration of a smartphone. That sound is the one of a spinning eccentric motor an ERM (Eccentric Rotating Mass). It is inexpensive, is very common and it functions. But it is slow. Spin-Up Time is 20-30ms. The mode of vibration is determined. One thing you feel is a generic rumble.
This was improved on by LRA motors (Linear Resonant Actuators). The reaction time decreased to about 10-15 milliseconds. The vibration was narrowed down. Nevertheless the inherent constraint was that they were mechanical systems whose resonant frequencies they are. It is possible to adjust the buzz to a tune you find more pleasing, however, it is impossible to mold it into the shape that is more accepted to you.
So introduce multilayer piezoelectric ceramics. Piezoelectric actuators are not operated on the same principle. An electrical charge is applied and the ceramic material will deform. You can control voltage waveform, the deformation, velocity, amplitude and shape, etc. The response time is reduced to micro-second range. The actuator does not spin-up or coast-down. It has an immediate response.
Bestarsensor employ the inverse piezoelectric effect in their multilayer piezoelectric ceramics to produce high accuracy in shape and form of their tactile output. The same element which can replicate the snick of a mechanical shutter can also give an effect of slow rolling texture, such as running a finger across the ribbed metal by simply changing the drive signal.
This is no vibration. This is touch which is programmable.
More importantly, when stressed-that is, squeezed together-piezoelectric materials conduct electricity-the direct piezoelectric effect. This is because it is possible to use the same component delivering feedback to determined the force acting on the component. 

Where Haptic Precision Really Counts
1.Intelligent Cabs and Safety in Driving
The haptic feedback is most required in the automotive haptics input. The conditions are very tough. Latency of the response time needs to remain less than 10 milliseconds in order to be perceived as being at the same touch. The actuator should be enduring temperatures, both at the lowest and highest ranges of temperature: lower by -40°F（-40°C）and higher by 185°F（85°C）. It should be able to comply with durability standards of vibration and shock. And it should be slim enough so as to be placed in the background of a piece of glass or ornamental paneling, without exposing the visual design.
2.Precise Control of Medical and Industrial
The similarity between remote surgery systems and the highly sensitive industrial control panel is that the operator needs to feel what he is operating on.
In the context of a haptic interface between a surgeon and a robotic tool, the difference between certain technique and uncertainty guessing is called "force feedback". An effective haptic provides feedback of tissue resistance, tool contact as well as pressure limits but in the form of the hand. The operator upholds the mental image of the physical contact although there is no physical contact between the two individuals.
The same is a problem with the industrial panel operators. Input confidence is needed to make precision adjustments to the equipment of high value. The haptic validation of all control actions minimizes errors in inputs, and minimizes the time that a task takes to be completed.
High-performance piezoelectric components are important in giving the force resolution and responsiveness needed by these environments. They are not bringing any comfort. They are creating a linkage of operations in settings when open loops do not exist.

Next Layer: AI-Adaptive Haptics and Invisible Interfaces
A beginning point are the possible static haptic patterns. Next development is the dynamic and context-based feedback. Moving towards the models of individual user behavior, AI systems are starting to systematically model this behavior. Patterns in response, the delay to respond, repeat-tap frequency-probability, all these signals are used to determine whether the current haptic feedback is functioning well or not. Adaptive system uses the data of the user to increase or decrease the intensity, duration, and pattern of feedback used. Powerful, more explicit confirmations pulses are given to a new user. The knowledgeable user receives quicker, easier to use feedback, which does not in any way get in the way.
The other significant tendency is that the very screen will become extinct. The use of screenless design is on the rise. Automotive soon interiors are exploring integrated surfaces of the automotive interior, such as wooden trim, leather panels, metal controls which carrying touch input zones but having no visible display. The interface of smart homes is shifting to an input layer comprising of walls, furniture and textile used. The screen is hidden. Instead, it is the surface which becomes the interface.
The manufacturing of Bestarsensor helps such a direction. They have thin components, which are reliable and compatible with non-glass substrates in terms of their processes. Wood, leather, brushed aluminum, composite panels, any of these can be turned into a touch interface that has haptics response. The actuator is positioned on the back-side. The technology never is visible to the user. They simply get the reaction.
What the design of an invisible interface really needs at the hardware side is this. Not a concept. Not a render. A part that is fitting, lasting and working.

Conclusion
Haptic Feedback is not aimed at recreating the past. Making a comeback are physical buttons. The idea is to recover a thing that, using glass surfaces, they took away certainty.
Definiteness that the input is registered. Assurance that the order that was issued. Confidence that the operator is in command.
That certitude makes a real end. It minimizes the inattentiveness within automobiles; minimizes mistakes in health care and industry applications; decreases friction in consumer products. And it decreases that cognitive load that accumulates with each and every touch interaction leaving behind a small question mark.
This is at the material level through the work of Bestarsensor in piezoelectric haptics components. Physics of the technology (microsecond response, programmable waveform, pressure, thin form, etc.) directly aligns with what is actually required by modern interfaces.
The feature of haptic is not present. Digital interaction becomes reliable due to the feedback component. And credible interaction is the minimum preconditions of all the next generation of interactive interfaces is attempting to accomplish.    

If you want to know more about haptic feedback, welcome to contact Bestarsensor team.