Laser-crystallized polysilicon TFT adder cells on flexible metal foil

In an effort to develop a large area digital system (such as a CUP) on flexible metal foil substrate utilizing polysilicon TFT technology, we extensively studied 21 different adder cells most of them novel circuits. The adder circuits were first carefully designed to be best compatible with poly-Si TFT technology and then fabricated on flexible metal foil. Adder cells were carefully tested and their performance were evaluated and compared with the goal of realizing the optimum adder structure(s) suitable for poly-Si TFT digital system development.