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Scanning method for projected capacitive touch panels

A touch panel and projected capacitive technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve the problem of reduced positioning accuracy, achieve improved positioning accuracy, increased scanning frequency, and obvious advantages Effect

Active Publication Date: 2010-09-22
TPK TOUCH SOLUTIONS (XIAMEN) INC
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the defect of adopting interlaced scanning touch panel is that the scanning of mutual capacitance that may be touched in other 3 / 4 touch areas is ignored, and the positioning accuracy will be reduced to a certain extent.
[0015] The present invention studies the defect that the existing projected capacitive touch panel scanning method is not suitable for scanning large-size panels, and finds out a scanning method suitable for medium and large-size panels

Method used

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  • Scanning method for projected capacitive touch panels
  • Scanning method for projected capacitive touch panels
  • Scanning method for projected capacitive touch panels

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Embodiment Construction

[0050] The scanning method of the present invention is mainly completed by the projected capacitive touch panel 13 and the controller 14, such as image 3 Shown: the electrical connection between the projected capacitive touch panel 13 and the controller 14, the projected capacitive touch panel 13 includes conductive electrodes insulated from each other, that is, arranged along the first direction (X-axis direction) M (M ≥ 1) first electrodes (horizontal axis electrodes) substantially parallel to each other and N (N ≥ 1) arranged along the second direction (Y-axis direction) that are also substantially parallel to each other and perpendicular to the horizontal axis electrodes ) strips of the second electrode (vertical axis electrode), the first electrode and the second electrode are formed in an electrode matrix between each other, and the first electrode or the second electrode is respectively connected to a third-party potential (human finger, M and N self-capacitances are f...

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Abstract

The invention relates to a scanning method for projected capacitive touch panels, which includes the following steps that: (a) the self capacitance reference values of each first electrode and each second electrode and the mutual capacitance reference value of each intersection are set; (b) a controller scans the self capacitances of all the electrodes to obtain the current self capacitance value of each electrode, which is compared with the self capacitance reference value corresponding to the electrode to determine that the first and the second electrodes with the changed self capacitance values are touched; and (c) the controller scans the mutual capacitance of each intersection between the first and the second electrodes determined to be touched in the step b to obtain the current mutual capacitance value of each intersection, which is compared with the mutual capacitance reference value corresponding to the intersection to determine that the area where the intersection with the changed mutual capacitance value is positioned is an actually touched area. The method effectively combines self capacitance scanning with mutual capacitance scanning, the scanning frequency is high, the precision is high, and the method is particularly suitable for the multi-spot scanning of medium-sized and large-sized touch panels.

Description

technical field [0001] The invention relates to a scanning method of a capacitive touch panel, in particular to a scanning method of a projected capacitive touch panel. Background technique [0002] At present, capacitive touch panels include projected capacitive touch panels and surface capacitive touch panels, among which projected capacitive touch panels are widely used in electronic products, such as figure 1 Shown: a known projected touch screen 1, including a protective layer 11, a substrate 12, a projected capacitive touch panel 13 and a controller 14; 13; the substrate 12 is located below the projected capacitive touch panel 13; the controller 14 is electrically connected to the projected capacitive touch panel 13, and is used to drive the projected capacitive touch panel 13 to work. [0003] Place figure 2 As shown: the common projected capacitive touch panel 13 is generally composed of mutually insulated conductive electrodes intersecting each other at right ang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044G06F3/041
CPCG06F3/0416G06F3/044G06F3/0446G06F3/041662G06F2203/04104
Inventor 王万秋
Owner TPK TOUCH SOLUTIONS (XIAMEN) INC
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