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Method for monitoring button state of capacitive sensing screen and capacitive sensing system

A technology of capacitive and inductive screens, which is applied in the monitoring of button states and in the field of capacitive sensing systems, which can solve the problems of button state detection or discrimination accuracy or reliability reduction, changing capacitor capacitance, etc., to achieve simple algorithms and improve accuracy The effect of less speed and less computing resources

Inactive Publication Date: 2009-09-09
上海芯驭电子有限公司
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Problems solved by technology

[0005] It should be pointed out that various environmental factors (such as humidity, temperature, and surface contamination, etc.) will change the capacitance of the capacitor, resulting in a reduction in the accuracy or reliability of button state detection or discrimination

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  • Method for monitoring button state of capacitive sensing screen and capacitive sensing system
  • Method for monitoring button state of capacitive sensing screen and capacitive sensing system
  • Method for monitoring button state of capacitive sensing screen and capacitive sensing system

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Embodiment Construction

[0051] In the following detailed discussion, various aspects of the invention are set forth by means of the written description and the accompanying drawings, which are presented by way of illustrative examples only, and which may be one or more exemplary embodiments of the invention. Those skilled in the art will be able to modify the various aspects described in various different ways, all without departing from the spirit or scope of the present invention.

[0052] In the following description, unless otherwise specified, capacitive sensing screen, capacitive sensing matrix and touch screen are terms that can be used interchangeably. Furthermore, in a typical capacitive sensing system, a capacitor (such as placed in figure 1 with 2 The capacitor formed between the metal pad and the ground plane on the printed circuit board shown) is a sensing unit, and the state of the button is determined based on the measured capacitance value or capacitance. In that sense, therefore, the...

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Abstract

A method for determining the button state of a capacitive sensing screen determines the state of a button according to the capacitance value of the button, wherein if the capacitance value is greater than a touch threshold, the button is in a pushed-down state; if the capacitance value is less than a noise threshold, the button is in a non-pushed-down state; and the touch threshold is greater than or equal to the noise threshold. Each threshold comprises a baseline value and a deviation value, wherein the baseline value is based on the capacitance value acquired in advance of the button, and the deviation value is the maximum expected value of the capacitance before the button is pushed down. The baseline values are changed before each judgment, so influences of environmental factors can be incorporated into the touch threshold and the noise threshold to improve the accuracy of the judgment and the detection of the state of the button. In an optical embodiment, the baseline values areset to be the average value of a plurality of the latest capacitance values of the button, and the number of the samples for working out the average value is determined according to the latest measured capacitance of the button.

Description

technical field [0001] The invention relates to man-machine interface technology, in particular to a method for monitoring button states of a capacitive sensing screen and a capacitive sensing system. Background technique [0002] Capacitive sensing is an interface technology that is rapidly gaining popularity in applications such as front-panel displays, consumer electronics, and automotive. A capacitive sensing system consists of a set of conductors that interact with an electric field. Because human tissue under the skin layer is filled with electrolytes, capacitive sensing can be achieved by leveraging the conductive properties of the finger. [0003] figure 1 A top view of a printed circuit board implementing a capacitive sensor button. exist figure 1 In the printed circuit board shown, the top layer 100 is a ground plane, and a metal pad (sensorpad) 110 is separated from the top layer 100 by an annular gap 120 to form a capacitor, which can be used as a sensing uni...

Claims

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Application Information

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IPC IPC(8): G06F3/044G01R27/26
Inventor 赵依军
Owner 上海芯驭电子有限公司
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