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Toray Launching Full-Fledged Production of RAYBRID for Upmarket Automotive Touch Panels

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Jul. 29, 2019

Toray Industries, Inc.

Advanced photosensitive material for metal mesh electrodes greatly increases sensitivity and sizes of automotive touch panels without compromising visibility

July 29th, 2019, Tokyo – Toray Industries, Inc., today announced the full-fledged production of RAYBRIDTM. This conductive silver paste incorporates a photosensitive resin. The material can enhance the motoring experience by improving the visibility and operability of automotive touch panels. The flexibility of RAYBRID can also contribute to larger, curved screens. Some display modules already employ this material.

Toray released RAYBRID in 2012 as a trace material for touch sensors in smartphones . The material has since contributed to lower resistance for larger displays while enabling finer patterning, for narrower bezels. With its proven reliability in smartphones, RAYBRID can match the rigorous performance requirements of automotive displays.
Automotive touch panels conventionally use indium tin oxide (ITO) electrodes that have solid mass-production and reliability records. But there are issues with panels larger than eight inches, including pattern visibility and high resistance. It is also hard to detect electrical changes on sensing areas, causing reaction delays and misoperations.
RAYBRID electrode is just 2 to 4 micrometers wide, with less resistance than ITO electrodes. It is thus perfect for metal mesh touch sensors. It is free of reaction delays and misoperation for large displays, while patterns are invisible to the naked eyes. Another advantage is the ability to form the trace and metal mesh electrodes at the same time. RAYBRID makes it possible to employ touch sensors on displays larger than eight inches, which has been a challenge with conventional technology.
RAYBRID’s performance and reliability advantages for automotive applications have prompted some manufacturers to start mass producing automotive panels using this material. Other key benefits of RAYBRID are that there is no need for special production equipment and that metal mesh electrodes offer 30% greater sensor sensitivity than conventional touch sensors.

 With RAYBRID electrodes, a sensor can bend more than 200,000 times at the bending diameter of 2mm without resistance changes. A combination of flexible RAYBRID with a Toray-developed transparent polyimide as a film substrate is an ideal solution for touch sensors that are thin, light, and flexible, and can be applied in curved displays. Curved automotive panels should become mainstream as the full adoption of self-driving technology leads to more comfortable vehicle interiors and broadens design freedom, such as to create more stylish instrument panels. Toray will continue striving to innovate materials that help enhance the comfort of the interiors of advanced automobiles.

Visible differences between RAYBRID metal mesh electrodes and ITO electrodes