Method and device for detecting touch or proximity

Abstract

The invention relates to a method and device for detecting touch or approaching. When each external electric conduction object approaches or touches a touch screen, signals corresponding to the outlines of the external electric conduction objects can be generated in the touch screen scanning process. When the value corresponding to the first outline of the first external electric conduction object and the value corresponding to the second outline of the second external electric conduction object are overlapped, the minimum value of the value of the first outline and the value of the second outline is used as a critical value, and a first part, belonging to the first outline, in the critical value and a second part, belonging to the second outline, in the critical value are determined according to the first value and the second value adjacent to the critical value respectively. Critical value distribution is carried out on two too close outline overlapped parts, and position errors caused by the overlapped parts can be effectively lowered.

Description

technical field [0001] The present invention relates to a detection method and device of a touch screen, in particular to a method and a device for a touch screen to detect a touch that is too close. Background technique [0002] A known mutual capacitive sensor includes an insulating surface layer, a first conductive layer, a dielectric layer and a second conductive layer; wherein the first conductive layer and the second conductive layer respectively have a plurality of first conductive layers A conductive strip and a second conductive strip, these conductive strips may be composed of a plurality of conductive sheets and connecting lines of the conductive sheets connected in series. [0003] When performing mutual capacitance detection, one of the first conductive layer and the second conductive layer is driven, and the other of the first conductive layer and the second conductive layer is detected. For example, the driving signal is provided to each first conductive stri...

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Problems solved by technology

[0007] However, if Figure 1C As shown, when corresponding to the value S12 of the partially overlapping contour of the first finger and the second finger, if the value of the overlapping part is directly used to calculate the centroid position, an error will be caused. The error position of the first finger and the second finger Pe1((1×2+2×5+3×7+4×5+5×3) / (2+5+7+5+3)=3.09), Pe2((5×3+6×6+ 7×9+8×6+9×1) / (3+6+9+6+1)=6.84) will be located at 3.09 and 6.84 respectively

[0008] For systems with strict error limits, the above-mentioned position error may exceed the tolerance limit of the error. For example, the tolerance limit of the system error is 1mm, the corresponding position width between the second conductive strips is 7mm, and the error position of the second finger is the same as the original center of mass. The position difference is 0.16 position width, about 1.02mm, which exceeds the tolerance limit of the system error

[0009] This shows that above-mentioned prior art obviously has inconvenience and defective, and extremely waits to be further improved

In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure and method for general products and methods to solve the above-mentioned problems. This is obviously a problem that relevant industry players are eager to solve

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