| 摘要 |
Described herein are systems and methods for interfacing a user with a touch-screen. In overview, some embodiments provide for an array of conventional numerical keys to be graphically represented as a primary menu on a touch-screen of a cellular phone or PDA. The graphically represented keys arranged as sectors or annular sectors in a contiguous array around a central origin. To provide text-based input (for example in the process of authoring a text-message or email), a user touch-selects one of the keys, and is provided with a secondary menu for allowing selection of a particular alphanumeric character associated with the selected numerical key. This association is optionally based on a protocol such as ETSI ETS 300 640 or ITU-T Recommendation E.161. In some embodiments the secondary menu, or a similar tertiary menu, is used to provide additional predictive text functionality.
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