Touch sensing unit and panel with same

Abstract

The invention provides a touch sensing unit and a panel with the same. The touch sensing unit comprises a sensing electrode, a switching element and a boosting and discharging unit, wherein the sensing electrode is used for sensing touch of an external object, the switching element is connected to the sensing electrode to generate a sensing voltage, and the boosting and discharging unit is connected to the sensing electrode and the switching element to discharge the sensing electrode or boost the voltage of the sensing electrode.

Description

technical field [0001] The present invention relates to the technical field of touch panels, in particular to a touch sensing unit and a panel with the touch sensing unit. Background technique [0002] figure 1 It is a circuit diagram of a conventional touch sensing device 100 . The existing touch sensing device 100 is composed of a pre-charge transistor 110, a detection electrode 120, an amplifier transistor 130, a read transistor 140, It is composed of a coupling capacitor 150 , a pre-charge line 160 , a coupling pulse line 170 , and a read line 180 . [0003] The touch sensing device 100 uses a finger to touch a glass surface or approach the touch sensing device 100, a finger capacitance Cf will be generated between the finger and the sensing electrode 120, and the finger capacitance Cf is not a physical capacitance. , which represents the sensing capacitance between the finger and the sensing electrode 120 . [0004] figure 2 It is a schematic diagram of the voltag...

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Problems solved by technology

However, in practice, when the touch sensing device 100 is integrated into a liquid crystal display panel, the aperture ratio of the crystal display and the visual experience of the resolution of the panel crystal display are considered in the design, and the practical sensing electrode 120 cannot be very large, that is, The capacitance Cf of the finger capacitance is about less than or equal to 1 fF, and the Cgds capacitance of the precharge transistor 110 or the amplifier transistor 130 is about tens of fF, so the touch sensing device 100 has the disadvantage of insufficient sensitivity.

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