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Object positioning and detecting device and p method of capacitance type touchpad

A technology of capacitive touch and positioning detectors, which is applied in the direction of instruments, electrical digital data processing, input/output process of data processing, etc., and can solve the problem that the capacitive touch panel 10 cannot be correctly judged, the capacitive touch panel The positioning method is inconvenient, and the object cannot be correctly positioned, etc.

Active Publication Date: 2014-11-12
ELAN MICROELECTRONICS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only locate a single object, and cannot correctly locate the position of an object in a multi-object application
E.g figure 2 As shown in the two-finger touch, two fingers touching the positions 20 and 22 at the same time will cause the basic capacitance value of the capacitive sensing components TX1, TX2, TY1 and TY2 to change, so there will be four sensing points, except for the real Outside the positions (TX1, TY2) and (TX2, TY1), there will be two ghost points at positions (TX1, TY1) and (TX2, TY2) 24 and 26, which makes the capacitive touch panel 10 unable to judge correctly out real finger positions 20 and 22
[0003] Therefore, there are above-mentioned inconveniences and problems in the object positioning method of the known capacitive touch panel.

Method used

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  • Object positioning and detecting device and p method of capacitance type touchpad
  • Object positioning and detecting device and p method of capacitance type touchpad
  • Object positioning and detecting device and p method of capacitance type touchpad

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Embodiment Construction

[0103] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0104] see now image 3 , image 3 It is a schematic diagram of two capacitive sensing components TXN and TYM of a capacitive touch panel. As shown in the figure, the intersection of the capacitive sensing components TXN and TYM has a parasitic side capacitance 30, and Cxy represents its capacitance value. When the object touches the intersection of the capacitive sensing components TXN and TYM, in addition to causing capacitive sensing The change of the basic capacitance of the components TXN and TYM will also cause the change of the capacitance of the side capacitor 30 , and the change of the side capacitance can be used in the positioning of the capacitive touch panel to identify the real touch position.

[0105] Figure 4 It is a flow chart of the object location detection method according to the present invention. Step S40 detects basic capacitance v...

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PUM

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Abstract

The invention relates to an object positioning and detecting method of a capacitance type touchpad, which is characterized by comprising the following steps of: (A) detecting the values of basic capacitances of a plurality of capacitance induction assemblies positioned on the capacitance type touchpad to find induction points; and (B) when a plurality of induction points are detected, detecting the values of side capacitances of the plurality of induction points to find the position of the object. An object positioning and detecting device and the object positioning and detecting method of the capacitance type touchpad have the advantages of distinguishing a real touch position and a ghost point of the object.

Description

technical field [0001] The invention relates to a capacitive touch panel, in particular to an object positioning detector and method for a capacitive touch panel. Background technique [0002] figure 1 It is a layout of a traditional two-dimensional capacitive touch panel 10 , which includes a plurality of capacitive sensing elements TX1 - TXN in the X-axis direction and a plurality of capacitive sensing elements TY1 - TYM in the Y-axis direction. The traditional object location method is to detect the basic capacitance value of each capacitive sensing component TX1-TXN and TY1-TYM, and the position where the maximum value is located is the position touched by the object. However, this method can only locate a single object, and cannot correctly locate the position of objects in multi-object applications. For example figure 2 As shown in the two-finger touch, two fingers touching the positions 20 and 22 at the same time will cause the basic capacitance value of the capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044G01D5/24
Inventor 黄俊中王尊民邱得盛
Owner ELAN MICROELECTRONICS CORPORATION