Method and device for determining positions of multi-touch of touch panel

A multi-touch and touch panel technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve signal drift, high environmental sensitivity, time-consuming capacitive touch panel, etc. problem, to achieve the effect of improving accuracy

Inactive Publication Date: 2014-05-14
HANNSTAR DISPLAY CORPORATION
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] In this way, there will be no ghost point phenomenon caused by the self-capacitive sensing method. However, since the first sensing axis and the second sensing axis need to be individually scanned for the magnitude of the capacitance signal Detection makes it time-consuming for capacitive touch panels to detect multi-touch contact points, so mutual capacitance detection technology is not suitable for capacitive touch panels with a large number of horizontal / vertical axis sensing lines
[0008] In addition, the main disadvantage of the capacitive touch panel is that it is highly sensitive to the environment. Therefore, when environmental factors such as temperature, humidity or environmental electric field change, the signal drift or noise of the capacitive touch panel will be caused, which directly affects the capacitive touch panel. Accuracy of touch panel

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  • Method and device for determining positions of multi-touch of touch panel
  • Method and device for determining positions of multi-touch of touch panel
  • Method and device for determining positions of multi-touch of touch panel

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Embodiment approach

[0073] In the first case, please also refer to Figure 5 . Assume: the elasticity parameter is 0.5, the capacitance signal of the touch point P1 is 140, the capacitance signal of the touch point P2 is 20, the capacitance signal of the touch point P3 is 30, and the capacitance signal of the touch point P4 is 150.

[0074] The maximum capacitance signal obtained from step S206 is 150; the minimum capacitance signal is 20.

[0075] From step S208, the maximum capacitance signal, the minimum capacitance signal and the elasticity parameter are substituted into the formula: threshold value = maximum capacitance signal × elasticity parameter + minimum capacitance signal × (1 - elasticity parameter);

[0076] Threshold value = 150× 0.5 + 20× (1 – 0.5);

[0077] Threshold = 85.

[0078] From step S210, compare the capacitance signals of the touch points P1, P2, P3 and P4 with the threshold value: the touch points P1 and P4 are greater than the threshold value to be a real touch poin...

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Abstract

The invention discloses a method and a device for determining positions of multi-touch of a touch panel. The method comprises the steps of sensing the capacitive signals of a plurality of first sensing axes and a plurality of second sensing axes t obtain a plurality of candidate touch points, sensing the candidate touch points and recording the magnitude and the position of the capacitive signal of each of the candidate touch points, determining a maximum capacitive signal and a minimum capacitive signal, establishing a threshold, and determining the candidate touch points greater than the threshold as real touch points, wherein the threshold is equal to the maximum capacitive signal multiplied by an elastic parameter plus the minimum capacitive signal multiplied by (1minus the elastic parameter), and the elastic parameter is a constant number ranging from 0 and 1.

Description

technical field [0001] The present invention relates to a design technology of a touch panel, in particular to a method and a device for judging a multi-touch position of a touch panel. Background technique [0002] In recent years, capacitive touch panels (Capacitance Touch Panels) generally used in touch devices are mainly composed of glass substrates, and a group of first sensing axes arranged in sequence and arranged vertically are coated on the glass substrates. and a set of second sensing axes arranged in sequence and arranged horizontally. The positions where the first sensing axes intersect with the second sensing axes form a plurality of intersection points on the glass substrate. [0003] When the user touches the touch panel with a finger, the capacitive signals of the first sensing axis and the second sensing axis will be changed on the touched point; Sensing Driver) to sense the capacitive signals of the first sensing axis and the second sensing axis to dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 锺润世陈纯熙黄建翔蔡昆华
Owner HANNSTAR DISPLAY CORPORATION
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