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Capacitance sensor structure

A capacitive sensor, sensor technology, applied in the direction of instruments, electrical components, electronic switches, etc., can solve the problem of large noise interference

Inactive Publication Date: 2012-10-17
ELAN MICROELECTRONICS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When the sensor 10 in the X direction detects the interaction capacitance Cxy or the series connected Cfy and Cfx, if there is noise that interferes with the Y direction sensor 12, then the interaction capacitance Cxy or the series connection Cfy and Cfx will have a reduced effect similar to a filter The degree of noise interference to the detector, but the noise that interferes with the sensor 10 in the X direction will directly enter the detector 14, and the larger the sensing area of ​​the sensor 10 in the X direction, the greater the degree of noise interference during detection

Method used

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Embodiment Construction

[0054] figure 2 It is a schematic diagram of the first embodiment of the present invention, wherein the left figure is a wiring diagram of the capacitive sensor, and the right figure is a cross-sectional view taken along the line A-A in the left figure. This embodiment is a capacitance sensor with double-layer conductors, and has long-strip sensors 20 and 22 in the X direction and the Y direction, the insulating layer 24 electrically isolates the sensors 20 and 22, the X direction sensor 20 and the Y direction sensor The sensing area of ​​the sensor 22 is different. In this embodiment, the sensing area of ​​the X-direction sensor 20 is much smaller than the sensing area of ​​the Y-direction sensor 22 . For example, compared with the prior art, the width W1 of the X-direction sensor 20 is reduced to have a ratio of 1 / 4 or less to the width W2 of the Y-direction sensor 22 . The capacitive sensor can be coupled to the X-direction sensor 20 and the Y-direction sensor 22 by a det...

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Abstract

A capacitance sensor structure includes a first sensor in a first direction and a second sensor in a second direction for sensing a variation in the mutual capacitance between the first sensor and the second sensor by applying an excitation signal to the first sensor and detecting a response signal from the second sensor. The sensing area of the second sensor is intentionally reduced to be much smaller than the sensing area of the first sensor for noise performance improvement of the mutual capacitance sensing.

Description

technical field [0001] The present invention relates to a capacitive touch element, in particular to a capacitive sensor structure. Background technique [0002] The principle of capacitive touch technology is that the capacitance value of the sensor located at the touch point changes by an object (such as a finger or other conductor) touching the capacitive touch element, and the position of the touch point is obtained through detection by a detector. At present, there are two kinds of capacitance values ​​sensed by capacitive touch elements, one is the self capacitance between the sensor and the ground, and the other is the interactive capacitance between the two sensors ( mutual capacitance). figure 1 It is a schematic diagram of the change of the interactive capacitance when the finger touches the capacitive touch element. The lines 10 and 12 in the figure represent the sensors in the X and Y directions. The capacitances Cx and Cy are the self-capacitance of the sensors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
CPCH03K17/962G06F3/0418G06F3/044G06F3/0446G06F3/0443G06F3/0445
Inventor 陶逸欣林嘉兴许哲豪许文俊
Owner ELAN MICROELECTRONICS CORPORATION