Patent ID: 8717300

Claim:
A display device, comprising: a plurality of signal wires for supplying an image signal; a plurality of pixels in each of which an image is displayed in accordance with the image signal supplied from a corresponding one of the plurality of signal wires; at least one operational amplifier having (i) a non-inverting input terminal connected with a corresponding one of the plurality of signal wires, (ii) an inverting input terminal, and (iii) an output terminal; a switch via which the non-inverting input terminal of said at least one operational amplifier is connected with the corresponding one of the plurality of signal wires, the switch having a control terminal for controlling conducting and blocking states of the switch; a comparator configured to (i) compare a data electric potential with a reference potential that corresponds to a certain gray level and (ii) output a result of the comparison; an OR circuit configured to receive an external control signal via one input terminal and receive the result of the comparison from the comparator via the other input terminal, output from the OR circuit being supplied to the control terminal of the switch; a first impedance element via which the non-inverting input terminal and the output terminal of said at least one operational amplifier are connected with each other; a second impedance element via which the inverting input terminal and the output terminal of said at least one operational amplifier are connected with each other; and a third impedance element via which the inverting input terminal of said at least one operational amplifier is connected with a reference voltage terminal, wherein, while (a) the corresponding one of the plurality of signal wires connected with the non-inverting input terminal and (b) pixels electrically connected with the corresponding one of the plurality of signal wires connected with the non-inverting input terminal are being supplied with the image signal, a value Zn of total impedance of the pixels electrically connected with the corresponding one of the plurality of signal wires connected with the non-inverting input terminal is represented by: | Zn|>|Z 1|·| Z 3|/| Z 2| where Z 1 is a value of impedance of the first impedance element, Z 2 is a value of impedance of the second impedance element, and Z 3 is a value of impedance of the third impedance element, when the data electric potential is equal to or less than the reference potential, the switch is caused to be in the conductive state, and when the data electric potential is greater than the reference potential and the external control signal does not instruct the switch to be conductive, the switch is caused to be in the blocking state.