Touch sensitive device and touch determination method thereof

摘要

The present disclosure relates to a touch control device and touch determination method thereof. When a processor determines a capacitive coupling variation of a sensing point at a sensing panel of the touch sensitive device is smaller than a predetermined negative threshold or larger than a predetermined positive threshold, the processor then computes from local 2D sensing information of second 2D sensing information measured at the sensing point, to obtain a flatness index, The processor determine that the sensing point is not touched by any external object if the flatness index is between a predetermined flatness index negative reference value and a predetermined flatness index positive reference value that indicates the capacitive coupling amount at the sensing point is changed by the sensing point is not touched by any external object, whereby a false touch control determination due to removing water drop on the touch sensing panel can be prevented.

主权项

1. A touch determination method, used in a touch sensing device comprising a touch sensing panel which has arranged therein a plurality of driving lines and a plurality of sensing lines crossed over the driving lines to form a plurality of sensing points, a driving and sensing circuit electrically connected with the driving lines and the sensing lines, a processor electrically connected with the driving and sensing circuit, and a memory electrically connected to the processor, and the touch determination method comprising the steps of:
(A01) the driving and sensing circuit measuring a first time capacitive coupling amount at each of the sensing points on each of the driving lines via each of the sensing lines, and then integrating the measured first time capacitive coupling amount of each of the sensing points and respective coordinate data of all the sensing points into a first 2D sensing information; (A02) the processor using the first 2D sensing information as a reference 2D sensing information; (A03) the driving and sensing circuit again measuring a second time capacitive coupling amount at each of the sensing points on each of the driving lines via each of the sensing lines, and then integrating the measured second time capacitive coupling amount of each of the sensing points and respective coordinate data of all the sensing points into a second 2D sensing information; (A04) the processor subtracting the respective second time capacitive coupling amount of the second 2D sensing information from the respective first time capacitive coupling amount of the reference 2D sensing information, to obtain a plurality of capacitive coupling variations, and then integrating each of the capacitive coupling variations and respective coordinate data of all the sensing points into a capacitive coupling variation information; (A05) the processor comparing the capacitive coupling variations of the capacitive coupling variation information with a predetermined negative threshold and a predetermined positive threshold to check whether or not there is the capacitive coupling variation of the sensing point smaller than the predetermined negative threshold or larger than the predetermined positive threshold, and then proceeding to step (A06) if negative, or step (A07) if positive; (A06) the processor determining that the touch sensing panel is not touched by an external object, and returning to step (A03); (A07) the processor processing the local 2D sensing information of the second 2D sensing information measured at the sensing point to obtain a flatness index, and proceeding to step (A08); (A08) the processor comparing the flatness index with the predetermined flatness index negative reference value and the predetermined flatness index positive reference value to check whether or not the flatness index is smaller than the predetermined flatness index negative reference value or larger than the predetermined flatness index positive reference value, and then proceeding to step (A09) if negative, or step (A10) if positive; (A09) the processor determining that the sensing point is not touched by the external object, and then updating the second 2D sensing information for use as the reference 2D sensing information, and returning to step (A03); and (A10) the processor determining that the sensing point on the touch sensing panel is touched by the external object, and then executing an operating instruction correspondingly, and returning to step (A03).