Capacitive touch pad with comb-shaped electrode

Abstract

The invention relates to a capacitive touch pad with comb-shaped electrodes, which comprises a transparent substrate and inductive electrodes. The inductive electrodes are arranged on the transparent substrate and comprise a group of transverse electrode wire traces, a group of longitudinal electrode wire traces and leading-out wires connected with the I/O ports of a touch chip, wherein the transverse electrode wire traces intersect with the longitudinal electrode wire traces. The invention is characterized in that at least partial leading-out wires are connected with the electrode wire traces in a way that one leading-out wire corresponds to a plurality of electrode wire traces. By adopting the arrangement, one I/O port of the touch chip corresponds to one leading-out wire and one leading-out wire can correspond to a plurality of electrode wire traces. Thereby, the number of the electrode wire traces in a touch area can be multiplied, the number of the electrodes can be multiplied, the distribution of the electrodes is kept to be even, the density of charges distributed on the capacitive touch pad is enabled to be changed more stably, the linearity of an electric field is enabled to be more stable, the coupling capacitance on the touch area is improved and the accuracy and the sensitivity of the touch pad are improved.

Description

technical field [0001] The invention relates to a touch panel, in particular to a capacitive touch panel with comb electrodes. Background technique [0002] Capacitive touch panels have been widely used in various electronic products, such as mobile phones, mp4, POS terminals and so on. The capacitive touch panel is characterized by high transmittance and no need to apply force when touching, and can resist harsh external environments, such as water, temperature changes, and humidity, so it has a long service life and can realize multiple touch points during work. Simultaneous detection, more user-friendly operation. [0003] The capacitive touch panel generally includes a transparent substrate and sensing electrodes, the sensing electrodes are arranged on the transparent substrate, and the leads of the sensing electrodes are electrically connected to the detection circuit. In the case of setting two transparent substrates, one of the substrates can be used as a dielectric...

AI Technical Summary

Problems solved by technology

This traditional design method of sensing electrode traces depends on the number of IO ports of the touch chip and the area of ​​the touch panel to determine the density of the electrode traces, resulting in coupling capacitance between the sensing electrodes, or between the sensing electrodes and the human body or the ground. The coupling capacitance is limited, that is, the existing electric field and the electric field generated by touch are limited, which affects the linear stability of the electric field. As a result, the signal sensitivity of the capacitive touch panel on the hardware can only reach a certain level. However, in a special environment, it may not be able to meet the use requirements, such as the touchpad is suspended in the air, or the touchpad is stained with water droplets, etc., and the touch will fail.

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