Abstract— A paper‐thin QVGA, flexible 2.1‐in. active‐matrix electrophoretic display (AMEPD) that features 100‐μm thick and a 192‐ppi resolution has been developed. An LTPS‐TFT backplane with integrated peripheral driver circuits was first fabricated on a glass substrate and then transferred to a very thin (30‐μm) plastic film by employing surface‐free technology by laser ablation/annealing (SUFTLA®). A micro‐encapsulated electrophoretic imaging sheet was laminated on the backplane. A supporting substrate was used to support the LTPS‐TFT backplane. Fine images were successfully displayed on the rollable AM‐EPD. The integrated driver circuits dramatically reduce the number of external connection terminals, thus easily boosting the reliability of electrical connections even on such a thin plastic film.

We have developed a flexible 7.1‐inch Quad‐XGA active‐matrix electrophoretic display using SUFTLA™. The whole panel circuitry including 7.3‐milion transistors was successfully transferred onto a plastic substrate without damage. Integrating both scan‐ and data‐drivers made it possible that 3‐mega pixels are controlled with only 40 signal terminals. The developed panel fulfills major requirements for e‐paper including true flexibility, thinness and lightness.

A flexible 16kb SRAM based on low‐temperature poly‐silicon LTPS) TFT technology and surface‐free technology by laser annealing/ablation (SUFTLA®) is presented. The chip consists of approximately 110,000 transistors and occupies an area of about 90mm2 (10.8mm × 8.3mm). The read access time is 650ns at 3.0V and 200ns at 6.0V.