Abstract: A projective capacitive touch apparatus and a method for identifying multi-touched positions are provided. The multi-touched positions are touched on a projective capacitive touch panel. The method comprises the following steps: generating a first set of reference values according to the first touch position; generating a plurality of second sets of reference values according to a second touch position, and filtering out at least one ghost second set of reference values from the second sets of reference values. Furthermore, the plurality of second sets of reference values comprise a real second set of reference value and at least one ghost second set of reference values, while the ghost second set of reference values comprises parts of the first set of reference values.

Abstract: An exemplary method for detecting touch position includes the steps of: detecting a plurality of sensing points, obtaining at least one first signal and a plurality of second signals on the sensing points, wherein the at least one first signal each has an energy above a preset threshold, the second signals each has an energy below the preset threshold, positions of the sensing points where the second signals being detected are successive with a position(s) of the sensing point(s) where the at least one first signal being detected; performing a weighted averaging operation applied to the energies of the at least one first signal and the second signals and taking a result of the weighted averaging operation as a first dimension coordinate of a touching point, wherein weights of the respective energies are associated with the positions of the sensing points where the at least one first signal and the second signals being detected.

Abstract: A control method for a touch screen device is provided. The control method comprises the steps of: enabling an active mode of a touch panel; defining at least one active area on the touch panel; inputting a touch input into any one position on the touch panel; determining whether the touch input exists in the active area; and saving calculation of coordinate values of the position corresponding to the touch input and outputting a corresponding predetermined output signal in accordance with the touch input when the touch input exists in the active area.

Abstract: A projective capacitive touch apparatus and a method for identifying multi-touched positions are provided. The multi-touched positions are touched on a projective capacitive touch panel. The method comprises the following steps: generating a first set of reference values according to the first touch position; generating a plurality of second sets of reference values according to a second touch position, and filtering out at least one ghost second set of reference values from the second sets of reference values. Furthermore, the plurality of second sets of reference values comprise a real second set of reference value and at least one ghost second set of reference values, while the ghost second set of reference values comprises parts of the first set of reference values.