Serious climate changes and energy-related environmental
problems
are currently critical issues in the world. In order to reduce carbon
emissions and save our environment, renewable energy harvesting technologies
will serve as a key solution in the near future. Among them, triboelectric
nanogenerators (TENGs), which is one of the most promising mechanical
energy harvesters by means of contact electrification phenomenon,
are explosively developing due to abundant wasting mechanical energy
sources and a number of superior advantages in a wide availability
and selection of materials, relatively simple device configurations,
and low-cost processing. Significant experimental and theoretical
efforts have been achieved toward understanding fundamental behaviors
and a wide range of demonstrations since its report in 2012. As a
result, considerable technological advancement has been exhibited
and it advances the timeline of achievement in the proposed roadmap.
Now, the technology has reached the stage of prototype development
with verification of performance beyond the lab scale environment
toward its commercialization. In this review, distinguished authors
in the world worked together to summarize the state of the art in
theory, materials, devices, systems, circuits, and applications in
TENG fields. The great research achievements of researchers in this
field around the world over the past decade are expected to play a
major role in coming to fruition of unexpectedly accelerated technological
advances over the next decade.
-In this paper, we present novel organic light-emitting diode (OLED) display panel compensation technologies for large-sized ultra-high-definition OLED TVs considering variations of threshold voltage, mobility, channel size, OLED efficiency, and OLED uniformity. Using these technologies, we have successfully launched
As the internet of things (IoT) era approaches, various sensors, and wireless electronic devices such as smartphones, smart watches, and earphones are emerging. As the types and functions of electronics are diversified, the energy consumption of electronics increases, which causes battery charging and maintenance issues. The piezoelectric nanogenerator (PENG) received great attention as an alternative to solving the energy issues of future small electronics. In particular, polyvinylidene fluoride (PVDF) piezoelectric polymer-based PENGs are strong potential candidate with robust mechanical properties and a high piezoelectric coefficient. In this review, we summarize the recent significant advances of the development of PVDF-based PENGs for self-powered energy-harvesting systems. We discuss the piezoelectric properties of the various structures of PVDF-based PENGs such as thin film, microstructure, nanostructure, and nanocomposite.
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