Capacitive touch device capable of avoiding reduced frame rate and sensing method thereof

摘要

A capacitive touch device and a sensing method thereof are disclosed. The capacitive touch device includes a touch panel and a plurality of touch detection units. The touch panel includes first sensing lines and second sensing lines. The position of a touch between a last one of the first sensing lines and a first one of the second sensing lines is calculated according to sensed values respectively corresponding to a first sensing line prior to the last one of the first sensing lines, the last one of the first sensing lines and the first one of the second sensing lines. The present invention is capable of avoiding the problem that the frame rate is reduced significantly because of the data transmission between the first and second touch detection units.

主权项

1. A capacitive touch device capable of avoiding a reduced frame rate, comprising:
a touch panel comprising a plurality of first sensing lines and a plurality of second sensing lines; and a plurality of touch detection units at least comprising a first touch detection unit and a second touch detection unit, the first touch detection unit electrically coupled to the first sensing lines and the second touch detection unit electrically coupled to the second sensing lines, wherein at least a last one of the first sensing lines is further electrically coupled to the second touch detection unit, and at least a first one of the second sensing lines is further electrically coupled to the first touch detection unit, and a position POS_RX of a touch between the last one of the first sensing lines and the first one of the second sensing lines is calculated according to a sensed value corresponding to a first sensing line prior to the last one of the first sensing lines, a sensed value corresponding to the last one of the first sensing lines and a sensed value corresponding to the first one of the second sensing lines, wherein the position POS_RX of the touch is calculated according to the following equation:POS⁢_⁢RX=POSI+PRX×(DIFF(I+1,J)-DIFF(I-1,J))(DIFF(I-1,J)+DIFF(I,J)+DIFF(I+1,J))  wherein POSI is a position of the last one of the first sensing lines, DIFF(I−1, J) is a difference value between the sensed value corresponding to the first sensing line prior to the last one of the first sensing lines when the touch occurs and a sensed value corresponding to the first sensing line prior to the last one of the first sensing lines when there is no touch, DIFF(I, J) is a difference value between the sensed value corresponding to the last one of the first sensing lines when the touch occurs and a sensed value corresponding to the last one of the first sensing lines when there is no touch, DIFF(I+1, J) is a difference value between the sensed value corresponding to the first one of the second sensing lines when the touch occurs and a sensed value corresponding to the first one of the second sensing lines when there is no touch, and PRX is a pitch between two adjacent ones of the first sensing lines or a pitch between two adjacent ones of the second sensing lines.