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Virtual Braille Keyboard with Electrovibration (Haptic) Feedback

IP.com Disclosure Number: IPCOM000244522D
Publication Date: 2015-Dec-17
Document File: 2 page(s) / 111K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a virtual braille keyboard with electrovibration (haptic) feedback that enables a blind user to navigate and select keys from a virtual keyboard by touch/feel.

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This is the abbreviated version, containing approximately 67% of the total text.

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Virtual Braille Keyboard with Electrovibration (Haptic) Feedback

Braille is a tactile writing system used by the blind and visually impaired as a means of

writing and reading text. Figure 1 shows the dot patterns for the braille alphabet.

Figure 1: Braille alphabet

A system is needed to enable blind users who type/write in braille to use a smart

device, such as a tablet, to type.

The novel contribution is a virtual braille keyboard with electrovibration (haptic) feedback.

The virtual braille keyboard enables a blind user to navigate a virtual keyboard by touch/feel. Dots one through six are played in sequence as the finger moves over a key, with short pauses between dots. To input a braile letter, the user lifts a finger from the keyboard at the associated location.

The touch panel has a conductive layer coated with an insulating layer, which the finger

rests upon. When voltage difference is applied between the finger and the conductive layer, a normal attractive force are induced. By alternating the voltage, we modulate the

friction force felt by the moving finger. The user "feels" the dot patterns under their finger on the touchscreen. See Cheng Xu, et al. "Tactile Display for the Visually Impaired Using TeslaTouch."

Figure 2: Tesla Touch

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Figure 3: Virtual Braille Keyboard

Example Usage Scenario


1. User places finger on virtual keyboard


2. User slides finger over keys. The user must keep the finger touching the screen

while moving about the scre...