[MEMS 2008] East for the organic EL display test transparent transparent touch panel

Shiyama Hoon, a professor at the Graduate School of information science and engineering, University of Tokyo, BP, reported on MEMS 2008 that a transparent, flexible sheet shaped "touch input element is being developed". Using the principle that the resistance changes when the material is strain. The purpose of the development is the use of organic EL, such as flexible display on this sheet to increase the touch panel function.

The sheet is formed on a PET substrate using an organic semiconductor PEDOT:PSS. PEDOT:PSS is a p type semiconductor with a positive hole. Compared with the transparent electrode ITO, the conductivity is low, but the transparency is high. In addition, the PEDOT:PSS can also use low-temperature process manufacturing, soft and easy to bend and other characteristics. ITO is not easy to bend and therefore cannot be used for.

Transparency, even if the PEDOT:PSS, as long as the attention to material selection, but also get more than 90% of the transmittance. On resistance, it is possible to obtain a low resistance through the thickening of the wiring (the research room of the commentator).

You can feel the strain of the pixel size is about 7mm * 5mm, size is still large. At the same time, it is still in the stage of the change of resistance in the process of touch or bending, so it is not equipped with the control circuit of IC and so on.

Touch the bending of the sheet with your fingers to demonstrate the change in resistance

Sheet. Had been almost transparent, in the PEDOT:PSS strain sensor detection environment, "can see the dust into" (East Great down the mountain)

Source: Technology Online