Input apparatus and method using optical sensing, and portable terminal using the same
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United States of America Patent
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Jun 14, 2011
Grant Date -
May 17, 2007
app pub date -
Oct 25, 2006
filing date -
Nov 11, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An input apparatus and method in a portable terminal are provided. The input apparatus includes a display unit, having a plurality of pixels; an optical sensing unit for forming a grid of optical signals in a predetermined area corresponding to the pixels of the display unit and producing location information of a pointer in the grid of optical signals; a coordinate converter for converting the location information of the pointer into coordinate information in the display unit and computing a location of a cursor in the display unit on the basis of the coordinate information; and a controller for controlling display of the cursor at the computed location in the display unit, wherein the controller identifies an operation mode of the input apparatus, and operates a portion of the optical sensing unit for key recognition if the operation mode is a key input mode.
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