Applications CLEVIOS for Foldable Touch

Next generation bendable tablets and smartphones have captured our imagination for years. And now its burgeoning into reality. Transparent touch sensor electrodes made from Heraeus Clevios™ PEDOT conductive polymers help next generation touch displays to become flexible, foldable, wearable, curved, 3D-shapeable thereby combining the best of potential technologies.

Foldable smartphones are expected to become widely available, providing an all-new user experience. Smartphone makers will be able to differentiate their products and are expected to bring first products to the market by 2019 or shortly thereafter (Figure 1).

Figure 1: Display Roadmap, foldable and rollable displays are expected to be the next major trends.

Wanted: flexibility and durability

Foldable and rollable touch displays will require all components to be mechanically fully flexible, durable, and robust to guarantee a long product lifetime. For example, materials need to withstand folding tests with more than 300k bendings at a radius of 1 mm. Traditional materials such as ITO have severe drawbacks and are not suitable.

An outstanding solution

Heraeus has developed a new key material, Clevios™ HY E, for foldable touch sensors. Even after over 300 k bendings at an extreme radius of only 1 mm, the materials electrical properties are stable owing to the outstanding and intrinsically flexible properties of the conductive polymer PEDOT:PSS. Sheet resistances can reach as low as 40 Ohm/sq (Figure 2).

Figure 2: Clevios™ HY E

Successful AMOLED touch display prototype

Together with ITRI in Taiwan, we were able to demonstrate a successful use-case for Clevios™ PEDOT:PSS. A flexible AMOLED touch display prototype was built, using a foldable Clevios™ touch sensor on a 12µm polyimide substrate. Read the whole story

Clevios™ HY E is a hybrid material of silver nanowires (AgNW) and PEDOT:PSS, combining the best properties of both technologies.