Sensing electrode array control circuit and control method and touch control sensing system thereof

Abstract

The invention discloses a sensing electrode array control circuit. The sensing electrode array control circuit comprises an underclocking circuit, an intensity / phase frequency converter and a phase frequency analysis unit, wherein the underclocking circuit is used for underclocking a sensing signal of each sensing line on a touch control panel to acquire a corresponding underclocking signal, the underclocking signal is a direct current signal, the intensity / phase frequency converter is used for generating a corresponding phase frequency signal according to the underlocking signal, at least one of frequency and a phase of each phase frequency signal is relevant to an electric level of the corresponding underclocking signal, and the phase frequency analysis unit is used for acquiring signal quantity of the corresponding sensing line according to each phase frequency signal. Therefore, by the sensing electrode array control circuit, the operation speed and the signal-to-noise ratio of a touch control sensing system can be increased and improved on the premise of unnecessarily increasing manufacturing cost. The invention also provides a sensing electrode array control method and the touch control sensing system.

Description

technical field [0001] The present invention relates to a touch sensing system, in particular to a sensing electrode array control circuit and method for the touch sensing system. Background technique [0002] Touch sensing systems are currently widely used in various display devices, wherein touch panels of any size can be found in daily life. For example, a smart phone uses a small-sized touch panel, while an ATM uses a medium-sized touch panel. [0003] Currently, touch panels mainly include resistive touch panels and capacitive touch panels. However, no matter which type of touch panel has a sensing electrode array, a sensing electrode array control circuit is required to detect the touch area touched by the user on the touch panel. [0004] Please refer to figure 1 , figure 1 is a functional block diagram of a traditional touch sensing system. The conventional touch sensing system 1 includes a conventional sensing electrode array control circuit 11 , multiplexers 1...

AI Technical Summary

Problems solved by technology

However, because the level change of the DC voltage signal before and after the finger touches the touch panel is small, and it is easily affected by noise, the signal-to-noise ratio that can be improved is limited.

[0019] In addition, the integrator is also susceptible to noise, which makes it difficult to improve the signal-to-noise ratio of traditional touch sensing systems

In addition, the operation of the integrator is time-consuming, and each integration operation takes a specific time of 24 microseconds (μs) to 40 μs, which also makes it difficult to increase the operating speed of the traditional touch sensing system.

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