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GROUNDING ARRANGEMENT FOR CAPACITIVE INPUT DEVICE

IP.com Disclosure Number: IPCOM000248600D
Publication Date: 2016-Dec-21

Publishing Venue

The IP.com Prior Art Database

Related People

Juha Virtanen: INVENTOR [+2]

Abstract

A capacitive input device is configured to provide haptic feedback to a user. For providing haptic feedback, the electrical potential of the capacitive input device may be pulsed up to, for example, several kilovolts, and the signal lines and supply voltage lines of the capacitive input device may accordingly be galvanically insulated from the chassis. However, this insulation may reduce the sensitivity of the capacitive input device in detecting touch input. Hence, a low-impedance ground may be suitable for detecting touch input. Various example grounding arrangements automatically adjust their impedance level, based on the difference between the operating frequencies for detecting touch input and the operating frequencies for providing haptic output. For example, a grounding subsystem may respond to signal frequency such that its impedance at relatively low frequencies for haptic output is relatively high, but its impedance at relatively high frequencies for touch detection is relatively low.

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UNITED STATES PROVISIONAL PATENT APPLICATION

FOR

GROUNDING ARRANGEMENT FOR CAPACITIVE INPUT DEVICE

INVENTORS:

Juha Virtanen

Ville Makinen

Prepared by:

Schwegman Lundberg & Woessner, P.A.

1600 TCF Tower 121 South Eighth Street Minneapolis, MN 55402

Attorney Docket No. 3187.014PV4

Attorney Docket No. 3187.014PV4 1

GROUNDING ARRANGEMENT FOR CAPACITIVE INPUT DEVICE

TECHNICAL FIELD

[0001] The subject matter disclosed herein generally relates to systems and apparatus (e.g., devices and other machines) that are configured to receive or

otherwise detect input from a user of the apparatus. Specifically, the present

disclosure addresses grounding arrangements (e.g., grounding circuitry) for input

devices.

BACKGROUND

[0002] A capacitive input device (e.g., a device with a capacitive touchscreen or other capacitive touch input panel) may include dedicated circuitry to receive or

otherwise detect touch input from a user. For example, a touchscreen device may be

configured by suitable circuitry and software to detect changes in the capacitive

environment of one or more sensor lines printed on the inner surface of a glass

cover of a display screen.

Attorney Docket No. 3187.014PV4 2

BRIEF DESCRIPTION OF THE DRAWINGS

[0003] Some embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings.

[0004] FIG. 1 is a diagram depicting a tactile stimulation apparatus, in accordance with an example embodiment.

[0005] FIGS. 2A, 2B, 2C, and 2D depict diagrams of various composite section structures and components that each may be included in various tactile

stimulation apparatus, according to various example embodiments.

[0006] FIG. 3 is a circuit diagram, which implements an illustrative example embodiment of a tactile stimulation apparatus.

[0007] FIG. 4 is a circuit diagram depicting an example embodiment of a tactile stimulation apparatus wherein a strength of the capacitive coupling is

adjusted by electrode movement.

[0008] FIG. 5 is a circuit diagram depicting an example embodiment of a tactile stimulation apparatus wherein individual electrodes in a set of electrodes may

have opposite charges.

[0009] FIG. 6 is a circuit diagram depicting another example embodiment of a tactile stimulation apparatus having a group of individually controllable electrodes.

[0010] FIG. 7 is a circuit diagram depicting a distribution of an electric field- generating potential in capacitive couplings when a tactile stimulation apparatus is

grounded, in accordance with an example embodiment.

[0011] FIG. 8 is a circuit diagram depicting another example embodiment of a tactile stimulation apparatus having a floating voltage source.

[0012] FIG. 9 is a circuit diagram illustrating another example embodiment of a tactile stimulation apparatus.

[0013] FIG. 10 depicts a spatial wave created on a surface of the semiconducting region 254, in accordance with an example embodiment.

Attorney Docket No. 3187.014PV4 3

[0014] FIG. 11 is a schematic diagram...