Display-integrated tablet device providing coordinate detection

Claim 1

A display device integrated tablet device comprising: a tablet having a plurality of X-electrodes and Y-electrodes arranged in a matrix-like manner and including a display plane; an X-electrode drive means for driving said X-electrodes at a predetermined timing; a Y-electrode drive means for driving said Y-electrodes at a predetermined timing; a coordinate input means for generating a coordinate location signal for detecting a tablet coordinate of said tablet; an X-coordinate detection signal holding means, connected to said X-electrodes, and arranged for temporarily holding X-reception signals generated in said X-electrodes by said coordinate location signal; a Y-coordinate detection signal holding means, connected to said Y-electrodes, and arranged for temporarily holding Y-reception signals generated in said Y-electrodes by said coordinate location signal; a coordinate detection means, coupled to said X-coordinate detection signal holding means and said Y-coordinate detection signal holding means, to which said X-reception signals and X-electrode position data and said Y-reception signals and Y-electrode position data are input, for determining an X-coordinate and a Y-coordinate at which there is a maximal value of said X-reception signals and said Y-reception signals; and a control means for controlling said X-electrode drive means and said Y-electrode drive means during an image display period, so as to permit an image display to be carried out on said display plane of said tablet and so as to permit said coordinate input means to generate said coordinate location signal during a coordinate detection period, resulting in said X-reception signals and said Y-reception signals being received and held by said X-coordinate detection signal holding means and said Y-coordinate detection signal holding means, respectively.