Touch input device

Abstract

The invention discloses a touch input device, comprising a touch panel, a selection module and a detection module. The touch panel comprises a plurality of capacitance nodes which are formed and distributed on the touch panel; the selection module is electrically connected with the plurality of capacitance nodes of the touch panel and used for selecting at least one capacitance node from the plurality of capacitance nodes to form a first capacity node set and a second capacitance node set adjacent to the first capacity node set; and the detection module is electrically connected with the selection module and comprises a signal generator for generating detection pulse signals and inverted pulse signals with phases opposite to that of the detection pulse signals, wherein the detection pulsesignals are input to the first capacitance node set through the selection module and the inverted pulse signals are input to the second capacitance node set through the selection module.

Description

technical field [0001] The present invention relates to a touch input device and a touch sensing circuit, and in particular to a touch input device and a touch sensing circuit capable of suppressing electromagnetic interference. Background technique [0002] Due to the advancement of science and technology, products such as information, communication, and electronics are becoming more and more diversified and humanized. For example, through products such as touch panels and handwriting pads, users can directly operate programs or input information on the panels with their fingers or stylus, saving the trouble of using input devices such as mouse or keyboard in the past. [0003] Existing touch panel technologies can be roughly classified into resistive, capacitive, optical and ultrasonic types. The main composition of the resistive touch panel includes upper and lower layers of indium tin oxide conductive glass (ITO glass). When an object touches the upper conductive glass...

AI Technical Summary

Problems solved by technology

When the detection module 14 inputs these high-frequency detection pulse signals into a specific capacitance node (such as the capacitance node 100a), it will cause electromagnetic interference to other electronic components (such as liquid crystal display screens, etc.) adjacent to the touch panel 10 in the electronic system. , may also cause electromagnetic interference to adjacent capacitor nodes (such as capacitor nodes 100b, 100c)

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