Patent ID: 6850225

Claim:
A tactile data-entry device comprising: manually operable input means arranged in a plurality of zones for operation by corresponding fingers of a user, means for color coding at least a portion of the plurality of zones of said input means, to provide a visual contrast and separation between each of the portion of the plurality of said zones, wherein said color coding is arranged such that each of the portion of the plurality of zones is assigned a color that is distinguishable from an adjacent other of the portion of the plurality of zones, and wherein successive ones of the portion of the plurality of zones display colors that form a spectrum-ordered color pattern in which said colors are arranged in order of successively increasing wavelengths such that each of the zones in the portion of plurality of zones bordered by at least two adjacent zones in the portion of plurality of zones has an associated color having a wavelength higher than one adjacent zone and lower than another adjacent zone.