We have developed a new high performance plastic substrate for flexible displays. The plastic substrate has a multi‐layered structure composed of a newly developed base film, hard coat layers and gas barrier layers. The plastic substrate has a unique balance of excellent optical properties, high heat resistance over 200 °C, and practical mechanical strength.

We have been developing a new transparent plastic substrate for flexible displays. The plastic substrate (OPS substrate) is composed of a newly developed base film (OPS film) and hard coat layers. The OPS substrate has excellent physical properties such as high transparency, low retardation and high heat resistance over 200°C. The coefficient of thermal expansion (CTE) is relatively low as 40–45ppm. The dimensional changes under various conditions including temperature and humidity were directly observed by using CCD camera. The electrical properties of the OPS substrate sputtered Indium Tin Oxide (ITO) at various temperatures were evaluated. The OPS substrate sputtered ITO at 200°C shows low sheet resistance as 10Ω/□ and it is almost same as that of glass substrate sputtered ITO under the same condition.