Yesterday we posted a Samsung patent report outlining two new digital pen inventions. Today, we're following up with a brief overview of yet another new Samsung patent filing that reveals their ongoing work on foldable displays. Samsung's patent application, which was published by the US Patent & Trademark Office earlier this month, illustrates an exemplary embodiment of an electronic pen and a terminal. The electronic pen is designed to generate an ultrasonic signal and an infrared signal. The terminal includes a foldable display unit and is configured to detect the ultrasonic signal and the infrared signal. The terminal is configured to determine coordinate information of the electronic pen based on the ultrasonic signal, the infrared signal and a folding angle of the foldable display unit.