Capacitive touch panel

Abstract

A capacitive touch panel that detects an input position accurately with a limited number of sensing electrodes is provided. First and second sensing electrodes adjacent to each other in a detecting direction are arranged such that among a plurality of branch patterns of the first sensing electrode a branch pattern closer to the second sensing electrode, and among a plurality of branch patterns of the second sensing electrode a branch pattern closer to the first sensing electrode are alternately arranged in the detecting direction. The widths in the detecting direction of the plurality of branch patterns of each sensing electrode are set such that the branch patterns on the opposite sides in the detecting direction have the smallest width, and the width of a branch pattern gradually becomes greater as the branch pattern gets closer to a branch pattern at the center.

Description

technical field [0001] The present invention relates to an electrostatic capacitive touch panel, which detects an input operation position from the arrangement position of the detection electrode by detecting a detection electrode that causes an increase in parasitic capacitance when an input operation body performing an input operation approaches. Background technique [0002] As a pointing device (pointing device) for performing instruction input on an icon displayed on a display of an electronic device, it is known to detect a change in electrostatic capacitance when an input operation body such as a finger approaches a detection electrode on an input operation surface. Capacitive touch panel for inputting the input operation position on the operation surface. [0003] In the conventional capacitive touch panel, a plurality of electrodes are arranged insulated from each other on an insulating substrate, and an electrode whose parasitic capacitance increases when an input ...

AI Technical Summary

Problems solved by technology

[0006] Here, the parasitic capacitance Cx of the detection electrode Ex0 increased by the approach of the input operation body 10 is compared with the capacitance C1 between the adjacent detection electrode Ex1 or the capacitance C2 between the surrounding dielectric of the insulating substrate and the like. It is a small amount below 10pF, and is proportional to the opposing area dS of the input operating body 10 and the detection electrode Ex, so when the input operating body 10 deviates from the vertical direction of the detection electrode Ex, the increase is significantly reduced, so it is difficult to Detect input operation position

[0007] In addition, in order to improve the detection accuracy of the input operation position, the pitch between the detection electrodes Ex is made narrow and a plurality of detection electrodes Ex are arranged along the detection direction, but the number of detection electrodes Ex arranged on the insulating substrate is increased. When the number is increased, the switching number of each switch 101, 102, 104, 105 will increase, so the detection time will become longer, and the size of the circuit components will also increase.

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