Haptic feedback technology makes the interaction full of details

Currently, smartphone users can feel vibrations when they receive a notification, text message, or tap the glass surface of the screen. This is haptic feedback technology.

Think about how important haptic feedback is to improve the user experience when using their smartphone in noisy or poor lighting conditions, such as outdoors at night, and even more so to enhance the sense of interaction.

In fact, we are not unfamiliar with this technology. Haptic feedback is widely used in touch screens such as mobile phones, tablets, cameras, etc., almost everywhere, throughout our daily life.

Smartphones today almost all have some type of touchscreen, as do tablets, airport check-in counters, vehicle center consoles, and the cameras in our hands have all been converted from physical buttons to touchscreens for us Bring a new user experience and fun.

With the deepening of the research on haptic simulation technology, haptic feedback implementations with various excitation methods such as electromagnetic, piezoelectric, pneumatic and electrical stimulation have appeared on the market.

Judging from the actual use effect and market feedback, the electromagnetic type requires a complex mechanism, the structure is thicker, and the response time is long; the pneumatic type requires complex nozzle arrays and pneumatic components, which is difficult to control; the electrical stimulation type is mainly used For the simulation of pain sensation in the game, the equipment is huge.

Mechanical buttons are generally reliable and provide inherent tactile feedback, and users can often feel the actual change in the button when using the mechanical button. However, as electronic devices become more and more space-constrained, mechanical buttons also pose a number of space issues and design constraints.

Therefore, in the conventional field, piezoelectric haptic feedback elements that are light, reliable and easy to drive are the majority.

The realization principle of piezoelectric tactile feedback technology: using the positive and inverse piezoelectric effect of piezoelectric ceramics, when external force is applied to the ceramics, the ceramics are deformed, and the internal polarization state changes, thereby generating electric charges; when the ceramics are loaded with drive When the voltage is applied, the ceramic produces mechanical deformation, which causes vibration.

▲Schematic diagram of driving circuit example

Piezoelectric ceramic actuator is an emerging tactile feedback technology in the market, which has received extensive attention. Piezoelectric ceramic actuator is not a motor type. It has a very short start-stop response time and higher efficiency. The volume ratio is ERM (deflection mass motor) and LRA (Linear Resonant Actuator) smaller. Piezo actuators can generate more deterministic feedback than ERMs and LRAs. It can also create highly detailed effects to share a variety of information, something LRA and ERM cannot do. Compared with the above two working principles, piezoelectric ceramic actuators have higher reliability and lower energy consumption, which is more in line with people's expectations for mature electronic products.

▲BPH-6206S-2.0MF-HF

For example, one of the best-selling products of BESTAR piezoelectric ceramics: No. BPH-6206S-2.0MF-HF is composed of piezoelectric ceramics and substrates. The ceramic performance is relatively stable, the size is small and thin, and the thickness is about 0.56mm, which is suitable for thin installation requirements. Not only that, piezoelectric ceramics have low power consumption, large amplitude, fast response speed, and long service life. Moreover, it can freely change amplitude and frequency through pulse control, and can cope with various forms of vibration, suitable for tactile and feedback scenarios.

Piezoelectric haptic feedback has a wide range of applications, including consumer electronics, automotive electronics, home appliances, and gaming equipment.

The experience at your fingertips is constantly being upgraded, and the related electronic technologies are also constantly innovating. Different markets require different types of haptic feedback technologies. As these markets continue to evolve, we witness that the future haptic feedback technology is moving towards The direction of innovation is changing and placing new demands on products and designers, and engineers are constantly striving to provide haptic feedback for products that are more widely used.

With the rapid development of my country's electronics industry, the application fields of piezoelectric ceramics continue to expand, the demand for piezoelectric ceramics continues to rise, and piezoelectric ceramics are widely used. In the future, under the background of 5G commercialization, the piezoelectric ceramics industry will maintain rapid development.