| 摘要 |
Disclosed herein is a keypad of a portable terminal including an array of a plurality of alpha-numeric key buttons for the input of alphabetic letters of a language, for example, English. The vowel input portion includes a plurality of key buttons, which are allotted with vowels of English alphabet showing a high frequency of use, and some consonants of English alphabet. The key buttons of the vowel input portion are grouped and arranged at a selected position to achieve a high accessibility of the user's. The consonant input portion includes the remaining key buttons, allotted with the remaining consonants of English alphabet. The consonants and vowels are classified into groups of two or more based on a similarity in geometrical shape thereof, such that each group is allotted to one of the key buttons of both the consonant input portion and the vowel input portion
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