INPUT-OUTPUT INTEGRATED TYPE DISPLAY DEVICE

摘要

PURPOSE: An input-output integrated type display device is provided to detect precise input position without changing the external shape or the thickness of module. CONSTITUTION: In an x-detection period of a non-display period, a source drive circuit(3) simultaneously applies to all signal wiring lines a pulse of a peak value proportional to a distance from a gate drive circuit(2). A coordinate detection circuit(8) obtains an x-coordinate on the basis of a voltage induced at a pen(7) corresponding to the peak value(x-coordinate) of the applied pulse. In a y-detection period, a pulse generation circuit(5) applies one pulse to a common line. The pen detects a potential variation in amplitude proportional to a distance(y-coordinate) from the source drive circuit, generated approximately simultaneously on all the signal wiring lines via a capacitance. The coordinate detection circuit obtains the y-coordinate similarly to the case of x-coordinate detection. The coordinate detection circuit obtains the x- and y-coordinates only through A-to-D conversion and multiplication by a constant.