Touch-panel device

摘要

Provided is a touch-panel device capable of detecting a touched position with high accuracy even when a touched area extends off an electrode area. In one embodiment, the touched area is assumed to be, for example, circular in shape. A width in an X direction (overlap width) and a width in a Y direction (overlap width) of an overlap area where the touched area in a circular shape and an electrode area overlap each other is determined based on sensor measured values. When the overlap width and the overlap width are different from each other, it is judged that the touched area extends off the electrode area, and a position of a center of the touched area in the circular shape is calculated as the touched position.

主权项

1. A touch-panel device for detecting a touched position based on sensor measured values determined by a plurality of sensors coupled to electrodes serving as sensor terminals, the touch-panel device being configured to:
determine, based on the sensor measured values for detecting a touched position in an X direction and a touched position in a Y direction, a width in the X direction and a width in the Y direction of an overlap area where a touched area and an electrode area of the electrodes overlap each other; determine, based on the width in the X direction and the width in the Y direction of the overlap area, a position of a center of the touched area; and calculate the position of the center of the touched area as the touched position, wherein, in a case where the touched area that includes a portion that extends off the electrode area in a first direction and another portion that overlaps the electrode area in the first direction, such that the portion of the touched area that extends off the electrode area is not detected, the position of the center of the touched area in the first direction is determined by subtracting, from a largest width in the first direction of the area where the touched area and the electrode area overlap each other, one-half of a largest width in a second direction, which is perpendicular to the first direction, of the area where the touched area and the electrode area overlap each other, and the first direction is one of the X direction and the Y direction, and the second direction is the other one of the X direction and the Y direction, and wherein: the width in the X direction of the overlap area where the touched area and the electrode area overlap each other is determined by multiplying a largest value of the sensor measured values on a Y axis by a preset value; and the width in the Y direction of the overlap area where the touched area and the electrode area overlap each other is determined by multiplying a largest value of the sensor measured values on an X axis by a preset value.