| 摘要 |
An alphanumeric data input system for entering text into portable cellular phones or hand held computers by making linear traces or taps with a thumb or finger on a touch sensitive lineographic keypad. This keypad is conveniently located on the upper and left part of the cellular phone or the hand held computer in order to facilitate the natural motion of the thumb thus avoiding fatigue and strain of the same. This new system allows the user to enter operational commands on the keypad, as well as entering of letters of different alphabets such as the Latin Alphabet, Mathematical Greek and Russian Alphabets and possibly of alphabets of other foreign languages including Japanese, Chinese and Korean. This system can be used for entering a combination of letters to speed up the writing process, and enables the entering of punctuation marks, typographical symbols and a wide range of mathematical symbols. The present invention describes a combination of a portable cellular phone with a hand held computer provided with a large screen that can rotate 90 degrees to facilitate reading of the text.
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