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Development of touch-sensitive display technology
Published2017.05.09 06:14Signal detection, processing, and display functions integrated into a single device
Using displays by touching them has become natural. There is a growing need to develop technology that detects human body information on displays, to the extent that one can feel touch sensitivity varying depending on the device.
A research team led by Professor Park Chul-min of Yonsei University announced that it has developed a core technology for next-generation displays that instantly detects conductive human body information, such as fingerprints, and displays it on a screen.
This research, conducted under the Basic Research Support Program of the Ministry of Science, ICT and Future Planning, addresses the limitation of currently used Organic Light-Emitting Diode (OLED) displays being separate from sensors. The device developed in this study, which simultaneously performs the functions of a sensor and a display, is called an Organic Light-Emitting Board (OLEB).
The organic light-emitting board reduces and simplifies the manufacturing process by integrating three components that perform signal detection, signal processing, and signal display functions. Since it is driven by an electric field generated by alternating current, it can utilize devices powered by the AC voltage used in general household appliances, enabling the development of highly efficient devices that reduce energy loss.
In addition, the electrical signal processing structure has been simplified, making it thinner (500 nm) and more flexible. It is also possible to write using a conductive pencil and display through self-luminescence. Conductive writing can be chemically erased.
Professor Park stated, “Unlike previous research, we have secured technological originality by developing it based on an alternating current electric field where detection and display are integrated,” adding, “It is expected to be applied to portable and automotive displays, smart windows for advertising, and more.”
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