DISPLAY DEVICE AND INPUT/OUTPUT DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a circuit which detects an output current from a pixel and an output current from an input device, and converts the output current into data.SOLUTION: The current detection circuit is provided that includes: an integrator circuit; a comparator; a counter, and a latch. The integrator circuit has a function of integrating a potential of a first signal during a period determined by a second signal and outputting it as a third signal. The comparator has a function of comparing the potential of the third signal with a first potential and outputting a fourth signal. The counter has a function of outputting the number of pulses included in a fifth signal as a sixth signal during a period determined by the fourth signal. The latch has a function of holding the sixth signal. The integrator circuit preferably includes: an operational amplifier; and one or more capacitive elements. The first signal is supplied from a pixel included in a display device or from an input portion included in an input device.SELECTED DRAWING: Figure 8