Coordinate position detecting device and display input device
AssigneeSharp Kabushiki Kaisha
InventorHiroki Yoshino
Life of this patent
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Abstract
A touch screen includes a capacitive sensor, a sensor driving portion, and a control portion. The capacitive sensor detects a touch position coordinate in a scanning plane for each frame of the scanning plane. The sensor driving portion drives the capacitive sensor at a speed of a frame rate, the frame rate representing a number of frames detected by the capacitive sensor per unit time. The central portion acquires an amount of movement of the touch position between successive frames based on positional information detected by the capacitive sensor, and sets the frame rate depending on the amount of movement.
Claims8
A coordinate position detecting device comprising:
- a position detecting portion detecting a touch position coordinate in a scanning plane for each frame of the scanning plane;
- a driving portion driving the position detecting portion at a frame rate, the frame rate representing the number of frames detected by the position detecting portion per unit time, the frame rate being variable in correlation with position interval values for a position interval between touch position coordinates in successive frames;
- and
- a control portion acquiring the position interval of a touch position between successive frames by the touch position coordinates detected by the position detecting portion, and setting the frame rate corresponding to the acquired position interval of the touch position in accordance with the correlation between the frame rate and the position interval values.
Dependencies are inferred from the claim text.