| 摘要 |
<p>PURPOSE: A touch screen device and a letter input method thereof are provided to input a complicated math equation, subscript/superscript of an operator, an exponent and a complicated fraction in a drag and drop way, thereby conveniently and simply inputting letters. CONSTITUTION: A question display unit(124) displays a question. A theme display unit(122) displays a theme corresponding to the question. A letter pad unit(126) comprises an object keyboard. An input unit(128) drags an object of the letter pad unit to input. The object is dragged from the letter pad and dropped to the input unit for an input. The object includes numbers, letters and symbols related to the question.</p> |
