Patent ID: 8269720

Claim:
A method of recognizing coordinates using a hybrid coordinate recognition input device in which a variety of commands, characters, and diagrams are input and stored or output, the input device including: a hybrid coordinate sensing unit for obtaining the absolute coordinates with respect to position of the input device, and obtaining relative coordinates by sensing an amount of relative movement with respect to a moving track; and a coordinate calculation unit for obtaining the absolute coordinates and the relative coordinates and converting the obtained relative coordinates into converted absolute coordinates; the method comprising: recognizing the relative coordinates the instant the input device is turned on; if an absolute coordinate sensing switch means operates in the process of recognizing the relative coordinates, obtaining the absolute coordinates at predetermined time intervals and if the absolute coordinate sensing switch means does not operate, obtaining only the relative coordinates; and calculating the converted absolute coordinates by using the obtained said absolute coordinates, converting the relative coordinate information into the converted absolute coordinates; wherein the relative coordinates are at least one selected among relative coordinates recognized before obtaining absolute coordinates, relative coordinates recognized at the instant the absolute coordinates are obtained, and relative coordinates recognized after obtaining the absolute coordinates; and wherein in the converting of the relative coordinates, the relative coordinates are converted into the converted absolute coordinates by using the following equation: R 1 , j ′ = R 1 + ∑ m = 1 j ⁢ Δ ⁢ ⁢ R 1 , m ⁢ ⁢ or ⁢ ⁢ R 1 , - j ′ = R 1 - ∑ m = 1 i - 1 ⁢ Δ ⁢ ⁢ R 1 , - m where R′ 1j , and R′ 1,−j are converted absolute coordinates, R 1 is the absolute coordinate of a reference point recognized by an absolute coordinate recognition method, ΔR 1,m , and ΔR 1,−m are the amounts of movement recognized by a relative coordinate recognition method, and j is an integer equal to or greater than 1.