Foldable Screen Smart Phone with Touch Sensor

The foldable screen smart phone is finally going to the market this year, 2019. The first launched foldable screen smart phone is a Chinese company, Royole Corporation on October 31, 2018. This foldable screen smart phone is named as FlexPai with 7.8 inch AMOLED display and the size is 4 inch after it is folded. The price of FlexPai foldable screen smart phone is in the range of 1,295 1,872 US dollars. This foldable screen smart phone can be folded for more than 200 thousand times. Then the second launched company is from South Korea, Samsung Corporation on November 8, 2018; it is eight days after the first foldable screen smart phone of Royole Corporation. It is a 7.3 inch AMOLED display panel and its name is "Infinity Flex". The key component material, glass is replaced by plastics or polymers. TFT LCD display panel is brittle and heavy in weight compared to that of plastics. Another key component material, ITO is replaced also due to its property of not foldable. ITO used as touch sensor is more than ten years before the metal mesh and silver nano-wire are invented. The touch sensor is a great invention for smart phone today and other devices such as vendor machine, smart TV and ATM (Automated Teller Machine) machine and so on. The instruction or command could be inputted into smart phone by finger press on the sensing screen instead of keying in by small key pad. There are six chapters in this book, it is related to the future of smart phone with a foldable screen and a touch sensor from the basic of smart phone touch sensor process technology and its application, extending to inkjet printing technology.