Apparatus and method to detect coordinates in a penbased display device

摘要

An apparatus and method to detect coordinates in a pen-based display device are provided. In the apparatus, when an electronic pen is placed at a specific position on a display, an image of a pixel group corresponding to the specific position is captured through a camera provided in the electronic pen, a reference point is detected in the pixel group by processing the captured image of the pixel group, an area type of the captured image is determined based on the reference point, values of a coordinate indications corresponding to the position of the pixel group are determined, selectively correcting the determined values of the coordinate indications according to the determined area type to determine final values of the coordinate indications, and applying a predetermined coordinates calculation rule to the determined final values of the coordinate indications to determine final coordinates of the electronic pen.

主权项

1. A method of detecting coordinates of a position of an electronic pen on a display based on a plurality of pixel groups arranged on the display, the method comprising:
capturing a pixel group corresponding to a specific position through a camera provided in the electronic pen, when the electronic pen is placed at the specific position on the display; detecting a reference point in one pixel included in the pixel group and determining a position area of the pixel group according to the reference point; determining values of coordinate indications corresponding to a plurality of pixels included in the pixel group in the area; and applying a predetermined coordinates calculation rule to the values of the coordinate indications to determine final coordinates of the electronic pen, wherein the coordinate indications have predetermined patterns defined as predetermined values, and each coordinate indication is located at one of the positions defined in a sub-pixel of each of the pixels of the pixel group except for the one pixel from which the reference point is detected.