In-cell multi-touch panel system with low noise and time division multiplexing and its driving method

摘要

An in-cell multi-touch panel system includes: an in-cell touch display panel, a touch display control system. In a first frame time interval, the touch display control system drives the in-cell touch display panel and samples the sensing voltage from the in-cell touch display panel to determine whether there is an approaching external object and noise interference. In a second frame time interval, the touch display control system finds out a frequency with minimum noise for use as a frequency of the touch driving signal when the noise interference exists. In a third frame time interval, the touch display control system is based on the frequency with minimum noise to correspondingly generate the touch driving signal so as to determine whether there is an approaching external object.

主权项

1. An in-cell multi-touch panel system with low noise and time division multiplexing, comprising:
an in-cell touch display panel, for displaying an image signal and sensing an external object, wherein the in-cell touch display panel includes a common voltage and touch driving layer, which has N second conductor lines to receive a common voltage in displaying period and a touch driving signal in touch sensing period; and a touch display control system connected to the in-cell touch display panel, for sequentially outputting a display driving signal to the in-cell touch display panel so as to display the image signal, and for sequentially outputting the touch driving signal to the in-cell touch display panel for sampling a sensing voltage from the in-cell touch display panel so as to determine whether there is the external object, wherein, the touch display control system drives the in-cell touch display panel and samples the sensing voltage from the in-cell touch display panel to determine whether there is the external object and noise interference during a first frame time interval, the touch display control system finds out a frequency with the minimum noise for use as a frequency of the touch driving signal when the noise interference exists during a second frame time interval, and the touch display control system is based on the frequency with minimum noise to correspondingly generate the touch driving signal so as to determine whether there is the external object during a third frame time interval.