Method and apparatus for ghosting suppression in capacitive key matrix and touch pads

A touch panel and capacitive technology, applied in the field of capacitive touch input devices, can solve problems such as ghosting

Active Publication Date: 2017-05-03
TEXAS INSTR INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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However, for less expensive devices that do not have these expensive arrang

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  • Method and apparatus for ghosting suppression in capacitive key matrix and touch pads
  • Method and apparatus for ghosting suppression in capacitive key matrix and touch pads
  • Method and apparatus for ghosting suppression in capacitive key matrix and touch pads

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[0016] Corresponding numerals and symbols in the different figures generally refer to corresponding parts unless otherwise indicated. The drawings are not necessarily drawn to scale.

[0017] The term "coupled" may include connections formed with intervening elements, and additional elements and connections may exist between any "coupled" elements.

[0018] figure 1 is a circuit diagram showing a capacitive sensor matrix. Matrix 100 includes nine sensors 102-1 through 102-9 in an exemplary three-by-three matrix. Each sensor 102-X includes a first plate 104-X and a second plate 106-X that are galvanically separated. Each of the first plates 104-X is coupled to one of the row lines 108-1 to 108-3. For example, first plates 104-1 through 104-3 are coupled to line 108-1. Each of the second plates 106-X is coupled to one of the column lines 110-1 to 110-3. For example, second plates 106-1, 106-4, and 106-7 are coupled to column line 110-1.

[0019] Touching of the sensors 10...

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Abstract

The invention discloses a method and an apparatus for ghosting suppression in a capacitive key matrix and touch pads. The apparatus includes a plurality of capacitive sensors arranged in a matrix on a substrate. A measuring circuitry measures the capacitance of each of a plurality of row lines and a plurality of column lines in the matrix coupled to the capacitive sensors. A first electrode is on the substrate on a first edge of the matrix and is proximal to a first corner of the matrix. The first electrode is coupled to the measuring circuitry. A second electrode is on the substrate on the first edge of the matrix and is proximal to a second corner of the matrix, the second corner opposing the first corner on the first edge. The second electrode is coupled to the measuring circuitry. The measuring circuitry determines the positions of two touches to the touch pad. Methods are disclosed.

Description

[0001] Cross References to Related Applications [0002] This application is entitled "Ghosting Suppression for Capacitive Key Matrix and Touch Pad" filed October 21, 2015 under 35 U.S.C. § 119(e) Inventors named Peter Spevak have the benefit of priority of commonly owned US Provisional Patent Application Serial No. 62 / 244,235, which is hereby incorporated by reference in its entirety. technical field [0003] The present application relates generally to capacitive touch input devices, and in particular to eliminating ghosting in capacitive touch input devices. Background technique [0004] Capacitive touch input devices have proven useful in a variety of environments. In a simple configuration, the sensor is a capacitor. In a self-capacitance sensor, the sensor forms the first plate of the capacitor. An electric field is formed around the sensor. The electric field is disrupted when the user's finger approaches the sensor. A non-conductive overlay protects the sensor. ...

Claims

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Application Information

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IPC IPC(8): G06F3/044
CPCG06F3/044G06F2203/04107G06F2203/04104G06F3/04166G06F3/0443G06F3/0446H03K17/9622H03M11/003G06F2203/04111
Inventor S·彼得
Owner TEXAS INSTR INC
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