Transparent piezoelectric film (under development)
The new transparent piezoelectric film developed by Daikin features a unique property called ferroelectricity that converts force, strain, temperature change, and electrical energy in both directions. Additionally, because of its excellent transparency and flexibility, it is expected to become a key material for pressure-sensitive touch panels and wearable devices.
What is ferroelectric material?
Fig.1 Ferroelectricity (piezoelectricity and pyroelectricity)
Solution
Fig.2 External view of film
Fig.3 External view of film (high transparency)
Features and grades
- High transparency and piezoelectricity
- Greater piezoelectric heat resistance than that of stretched PVdF (see Fig.4).
- Isotropy (differences in physical properties are small between vertical and horizontal in-planes [birefringence, d31 ≒ d32])
- Reliability
- High temperature and high humidity tests: No significant deterioration at 85℃/85RH% x 240 hr
- Heat shock test: No significant deterioration at -40℃ ⇔ 85℃ x 200 cycles
- Low heat shrinkage: 0.9% or less in 75℃ x 1 hr test, especially 0.2% or less in the Y40-T
- High-quality film with few fluctuations and defects due to Daikin’s unique continuous processing technology
- Roll specifications (width [mm]: 500, length [m]: 50-300)
Table.1 Physical characteristics / functions of piezoelectric film (under development)
Fig.4 Electrical properties of transparent piezoelectric film (development product)
(Aging of d33 at 90°C)
Fig.5 External view of roll
Expected industries and applications
- Human Machine Interface (HMI) in information terminals/ PCs (flat keyboards such as dual displays and folding devices, proximity sensors, and ultrasonic sensors)
: Transparent and highly sensitive piezoelectric and pyroelectric films
- Automotive (e.g., navigation touch panels, seat sensors, and collision impact sensors)
: Film that excels in design
- Healthcare (sleep sensors for mattresses, pulse/heart rate sensors）
: Film with excellent flexibility and durability to repeated stress
- FA / industrial equipment (equipment abnormality [vibration] sensors)
Fig.6 Expected industries and application examples
All the data shown in this report are not guaranteed.
In addition, this material is intended for general industry, and therefore its adequacy and safety as a raw material for medical purposes cannot be guaranteed.
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