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Reducing noise susceptibility in a mutual capacitance touchpad through axis swapping

A technology of noise sensitivity and mutual capacitance, which is applied in the direction of electrical digital data processing, the input/output process of data processing, instruments, etc., can solve the problem that the touch panel circuit 20 cannot determine the pointing object, etc.

Inactive Publication Date: 2013-05-01
CIRQUE CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the touchpad circuitry 20 under the control of a processor 28 cannot yet determine which side of the row electrode the pointing object is located, nor can the touchpad circuitry 20 determine how far the pointing object is from the electrode.

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  • Reducing noise susceptibility in a mutual capacitance touchpad through axis swapping
  • Reducing noise susceptibility in a mutual capacitance touchpad through axis swapping
  • Reducing noise susceptibility in a mutual capacitance touchpad through axis swapping

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Embodiment Construction

[0021] Referring now to the drawings, in which various elements of the invention will be numbered and discussed to enable those skilled in the art to make and use the invention. It should be understood that the following description is merely illustrative of the principles of the invention and should not be taken as narrowing the scope of the appended claims.

[0022] The invention applies to touch panels that use mutual capacitance in an X and Y grid of lateral electrodes, where the excitation or drive electrodes are on one axis and the input or sense electrodes are on the other axis. When there is significant noise on a finger or in a finger-equivalent system, it is desirable to minimize the effect of this noise by sampling all or a large number of sensing channels (sensing electrodes) simultaneously. If the sense electrodes are sampled simultaneously, the noise level on each sense electrode should be similar, and this noise can therefore be subtracted from the measured sign...

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Abstract

A system and method for reducing noise on a touchpad that uses mutual capacitance on an X axis and Y axis grid of transverse electrodes that function as stimulus or drive electrodes on one axis and function as inputs or sense electrodes on a different axis, wherein there is significant noise that can affect operation of the touchpad, and wherein it is desirable to minimize the effects of this noise by simultaneously sampling a group of sense electrodes, wherein by sampling the sense electrodes at the same time, the level of noise on each sense electrode should be similar and can therefore be subtracted out of measured sense signals to therefore more accurately determine a position of a sensed object or objects on the touchpad.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Provisional Patent Application Ser. No. 4835.CIRO.PR, Serial No. 61 / 368,494, all subject matter contained in this application is hereby incorporated by reference. technical field [0003] The present invention generally relates to touch sensing devices including touchpads and touchscreens. More specifically, the present invention is a method of reducing noise in a mutual capacitance touch sensing device that uses a transverse grid of X and Y electrodes in the sensor. Background technique [0004] Several designs exist for capacitive sensing touchpads. One of the existing touchpad designs that can be modified for use with the present invention is the Company-made touchpads. Therefore, it would be useful to examine the underlying technology to better understand how to modify any capacitive sensing touchpad for use with the present invention. [0005] The company's touchpads ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/30
CPCG06F3/0418G06F3/044G06F3/0446
Inventor 杰瑞德·G·毕瑟维保罗·文森特
Owner CIRQUE CORPORATION