Abstract: A touch panel system includes electronic pens and a touch panel. In the touch panel, a touch sensor detects a touch position that each of the electronic pens touches. A signal control device controls the touch sensor so as to transmit a reference signal indicating reference timing to the touching electronic pen, and to receive a response signal from the electronic pen. In each of the electronic pens, a reception electrode receives the reference signal from the touch panel. A timing generation circuit generates the response signal having a delay period of a predetermined value from the reference timing. A transmission electrode transmits the response signal to the touch panel through the touch sensor. The signal control device identifies the touching electronic pen, based on the delay period of the response signal received from each of electronic pens.

Abstract: An input device includes a plurality of touch panels and a position calculation unit. Each touch panel detects a touch operation and outputs detection values. The position calculation unit calculates the touch position touched in the touch operation, based on the detection values from the touch panels. The touch panels are joined together via a joint portion. In response to a touch operation of touching a joint region of the joint portion, the position calculation unit calculates the touch position in the joint region based on the detection values in the touch panels adjacent to each other across the touched joint region.

Abstract: An input device includes a touch sensor and a position detection unit. The touch sensor detects touch operations and output a detection value for each of detection regions. The position detection unit detects touch positions touched in the touch operations, based on the detection values from the touch sensor. The position detection unit performs emphasizing conversion process for converting the detection values of a target detection region to emphasize difference in detection values between the target detection region and neighboring regions which are the detection regions within a predetermined range around the target detection region. The target detection region is a detection region to be subjected to the emphasizing conversion process. The position detection unit detects the touch positions based on the converted detection value obtained by the emphasizing conversion process.