Input device and display apparatus

摘要

There is provided an input device including: means for performing zero point correction on the sensor outputs of the load sensors when an absolute value of an amount of output change of each load sensor is not more than a predetermined threshold a during a certain period of measurement time; means for calculating position data and calculating a total load Z of the load sensors by using the sensor outputs; means for determining that the calculation data pieces are normal when the absolute value |dZ/dt| of the amount of change in the total load Z is not more than the threshold β; means for determining that an input is present in the calculation data pieces when the absolute value |Z| of the total load is not less than the threshold γ; and means for removing a predetermined number of first and last data pieces in the calculation data pieces.

主权项

1. An input device having a panel and a plurality of load sensors disposed under the panel at different positions, each of the load sensors outputting a sensor output according to a load applied thereto, the input device being configured to calculate, based on the sensor outputs, an input position of an operational object which operates a panel surface, the input device comprising:
a first processing section configured to perform zero point correction on the sensor outputs when an absolute value of an amount of change in the sensor output of each load sensor is less than or equal to a predetermined threshold value α during a certain period of measurement time; a calculation section configured to calculate and obtain calculation data representing the input position and a total load Z of the load sensors using the sensor outputs on which the zero point correction has been performed; a second processing section configured to remove high-frequency noises in the calculation data by comparing an absolute value |dZ/dt| of an amount of change in the total load Z with a predetermined threshold value β, determining that the calculation data is normal if the absolute value |dZ/dt| is less than or equal to the threshold value β, and determining that the calculation data is abnormal if the absolute value |dZ/dt| is greater than the threshold value β; a third processing section configured to remove low-load data in the calculation data by comparing an absolute value |Z| of the total load Z with a predetermined threshold value γ, determining that the calculation data indicates an input performed by the operational object if the absolute value |Z| is greater than or equal to the threshold value γ, and determining that the input by the operational object is absent if the absolute value |Z| is less than the threshold value γ; and a fourth processing section configured to remove a predetermined number of first and last data samples from a series of successive data samples of the calculation data obtained by the calculation section.