Device and method for detecting touch screen

摘要

A driving signal is simultaneously provided to all first conductive strips arranged in parallel in a first direction in a touch screen, and mutual capacitive signals are detected from all second conductive strips arranged in parallel in a second direction. The mutual capacitive signals can be used for determining whether an external conductive object coupled to the ground is touching or approaching the touch screen or not even if water or other conductive object not coupled to ground is on the touch screen.

主权项

1. A device for detecting a touch screen comprising:
the touch screen including a plurality of first conductive strips and a plurality of second conductive strips; and a controller for simultaneously providing a driving signal to all of the first conductive strips, wherein said controller includes a processor for controlling the driving signal; wherein when the first conductive strips are provided with the driving signal, the controller detects signals of all of the second conductive strips to obtain a one-dimensional (1D) sensing information generated based on the signals of all of the second conductive strips, and determines if at least one external conductive object coupled to ground is touching or approaching the touch screen based on the 1D sensing information; wherein said processor controls the driving signal to be provided to all of the first conductive strips at a first frequency during a predetermined period of time or a predetermined number of times of providing the driving signal; wherein said processor controls the driving signal to be provided to all of the first conductive strips at a second frequency when, no approach or touch of an external conductive object coupled to ground is determined for the predetermined period of time or the predetermined number of times of providing the driving signal at the first frequency; and wherein the first frequency is higher than the second frequency.