Operation Input Device With Enhanced Touch Point Detection With A Display Device

Abstract: An operation input device includes: a knob for operations, disposed in a display region of a touch display; a conductor column that is provided in the knob, and that can be detected as a touch point irrespective of whether or not the knob is in a state of being touched with user’s finger; a touch point detecting unit (21) for detecting a plurality of touch points including the touch point corresponding to the conductor column, and outputting touch information related to the plurality of detected touch points; a knob touch point determining unit (22) for determining, by using the touch information, the touch point corresponding to the conductor column among the plurality of touch points detected by the touch point detecting unit (21); a touch coordinate value obtaining unit (23) for obtaining touch coordinate values of the touch point corresponding to the conductor column by using the touch information and a determination result by the knob touch point determining unit (21); and a finger-touch-on-the-knob determining unit (24a) for determining, on a basis of changes in the touch coordinate values with respect to time, whether or not the knob is in a state of being touched with user’s finger, by calculating amounts of changes in the touch coordinate values with respect to the time, obtaining estimated values of difference values between the touch coordinate values in the state in which the knob is being touched with user’s finger and the touch coordinate values in a state in which the knob is being touched with user’s finger, and comparing values of the amounts of changes with the estimated values to determine whether or not the knob is being touched with user’s finger. [Figure 9]

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