Patent ID: 9134850
Filing Date: 2015-09-15
Classification: G06F

Abstract:
1. A reference data updating method for a capacitive multi-touch screen, comprising: step A: one-frame sampling touch detection nodes, calculating a difference between sampled data of each touch detection node and corresponding current reference data and saving the difference as detection data to obtain a current detection data frame; step B: analyzing dominant detection data in the current detection data frame obtained in step A to judge whether the current detection data frame is a damaged detection data frame, wherein the damaged detection data frame includes negative dominant detection data, the negative dominant detection data refer to dominant detection data having a direction opposite to a touch signal direction, and the dominant detection data refer to detection data with amplitude greater than a touch event judgment threshold; and step C: executing a touch screen reference update processing procedure under abnormal condition if the current detection data frame is determined to be a damaged detection data frame at step B; otherwise, executing a touch screen reference update processing procedure under normal condition, wherein the touch screen reference data update processing procedure under abnormal condition includes the steps of: increasing/decreasing a value of a damaged detection data frame counter; quitting without any processing if a count value of the damaged detection data frame counter does not reach a preset value; resetting a static touch point elimination counter if the count value of the damaged detection data frame counter reaches a preset value and the counter is not in a condition restoration period, wherein the condition restoration period is a preset period of time after a reference update due to detection of a damaged detection data frame; and updating the touch screen reference data based on the current detection data, setting a condition restoration period tag, resetting and starting a condition restoration period timer, and cancelling the condition restoration period tag when the timer is up.