Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Hannover Messe: Silver circuits on foil allow curved touchscreens

12.04.2018

Mobile phones and smart phones still have not been adapted to the carrying habits of their users. That much is clear to anyone who has tried sitting down with a mobile phone in the back pocket: the displays of such devices are rigid and do not yield to the anatomical forms adopted by the people carrying them. To allow typing and swiping even on curved smartphones, touchscreens and electric conductor paths have also to be curved. Therefore INM has developed a technique which allows fabrication of such conductor lines on flexible foils and even on stretchable silicone.
INM will be presenting the so called photochemical metallization on this year’s Hannover Messe at stand B46 in hall 2.

For the proper functioning of touchscreens in smart phones or tablets, microscopically fine conductor lines are required on their surfaces. At the edges of the appliances, these microscopic circuit paths come together to form larger connective pads.


Silver circuits on foil with photochemical metallization.

Source: INM; free within this press release

Until now, these different lines had to be manufactured in several steps in time-consuming processes. With the photochemical metallization this is now possible in one single step on flexible substrates. The process offers several benefits: It is fast, flexible, variable in size, inexpensive and environmentally friendly. Furthermore additional process steps for post-treatment are not necessary.

In the new process, the foils are coated with a photoactive layer of metal oxide nanoparticles. “After that we apply a colorless, UV-stable silver compound,” Peter William de Oliveira, Head of Optical Materials explains. By irradiation of this sequence of layers, the silver compound disintegrates on the photoactive layer and the silver ions are reduced to form metallic, electrically conductive silver. In this way, lines of varying sizes down to the smallest size of a thousandth of a millimeter can be achieved.

This basic principle allows conductor lines to be created very individually. “There are different possibilities depending on the requirements: Writing conductor lines using UV lasers is the process which is particularly suitable for the initial customized prototype manufacture and for testing a new design of the conductor lines. However, for mass production, this method is too time-consuming,” the physicist de Oliveira explains.

The researchers are currently working intensely on a new method, the usage of transparent stamps. “These stamps push out the silver compound mechanically; conductor lines then only occur where the silver compound remains,” de Oliveira states. Since the stamps are made of a soft plastic, they can be arranged on a roll. Because the stamps are transparent, researchers at INM are now working on embedding the UV source directly in the roll.

“Thus, the initial steps for a roll-to-roll process will be taken,” the Head of Optical Materials group concludes. It will therefore be possible to manufacture conductor line structures of various sizes on foils on a large scale.

Your expert at INM
Dr. Peter William de Oliveira
INM – Leibniz Institute for New Materials
Head Optical Materials
Head InnovationCenter INM
Phone: +49681-9300-148
OptiMat@leibniz-inm.de

INM – Leibniz Institute for New Materials, situated in Saarbrücken, is an internationally leading centre for materials research. INM conducts research and development to create new materials – for today, tomorrow and beyond. Research at INM is performed in three fields: Nanocomposite Technology, Interface Materials, and Bio Interfaces. INM is an institute of the Leibniz Association and has about 240 employees.

Weitere Informationen:

http://www.leibniz-inm.de

Dr. Carola Jung | idw - Informationsdienst Wissenschaft

More articles from Trade Fair News:

nachricht Modular OLED light strips
17.09.2019 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP

nachricht Deburring EXPO: Finishing sheet edges and functional surfaces with the laser
12.09.2019 | Fraunhofer-Institut für Lasertechnik ILT

All articles from Trade Fair News >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: 'Nanochains' could increase battery capacity, cut charging time

How long the battery of your phone or computer lasts depends on how many lithium ions can be stored in the battery's negative electrode material. If the battery runs out of these ions, it can't generate an electrical current to run a device and ultimately fails.

Materials with a higher lithium ion storage capacity are either too heavy or the wrong shape to replace graphite, the electrode material currently used in...

Im Focus: Stevens team closes in on 'holy grail' of room temperature quantum computing chips

Photons interact on chip-based system with unprecedented efficiency

To process information, photons must interact. However, these tiny packets of light want nothing to do with each other, each passing by without altering the...

Im Focus: Happy hour for time-resolved crystallography

Researchers from the Department of Atomically Resolved Dynamics of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Hamburg and the European Molecular Biology Laboratory (EMBL) outstation in the city have developed a new method to watch biomolecules at work. This method dramatically simplifies starting enzymatic reactions by mixing a cocktail of small amounts of liquids with protein crystals. Determination of the protein structures at different times after mixing can be assembled into a time-lapse sequence that shows the molecular foundations of biology.

The functions of biomolecules are determined by their motions and structural changes. Yet it is a formidable challenge to understand these dynamic motions.

Im Focus: Modular OLED light strips

At the International Symposium on Automotive Lighting 2019 (ISAL) in Darmstadt from September 23 to 25, 2019, the Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, a provider of research and development services in the field of organic electronics, will present OLED light strips of any length with additional functionalities for the first time at booth no. 37.

Almost everyone is familiar with light strips for interior design. LED strips are available by the metre in DIY stores around the corner and are just as often...

Im Focus: Tomorrow´s coolants of choice

Scientists assess the potential of magnetic-cooling materials

Later during this century, around 2060, a paradigm shift in global energy consumption is expected: we will spend more energy for cooling than for heating....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Optical Technologies: International Symposium „Future Optics“ in Hannover

19.09.2019 | Event News

Society 5.0: putting humans at the heart of digitalisation

10.09.2019 | Event News

Interspeech 2019 conference: Alexa and Siri in Graz

04.09.2019 | Event News

 
Latest News

Quality control in immune communication: Chaperones detect immature signaling molecules in the immune system

20.09.2019 | Life Sciences

Moderately Common Plants Show Highest Relative Losses

20.09.2019 | Life Sciences

The Fluid Fingerprint of Hurricanes

20.09.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>