Patent ID: 7889189

Claim:
An electrooptic device comprising: a plurality of parallel signal lines provided in a pixel array region in which a plurality of pixels is arrayed; a driving circuit electrically connected to a first end of each of the signal lines outside the pixel array region; and a protection circuit in which a diode device is electrically connected to a second end of the signal line, the diode device dissipating static electricity from the signal line, wherein the resistance of the portion of the signal line from the center of the length to the driving circuit is higher than that of the portion of the signal line from the center to the diode device, wherein the resistance of the portion of the signal line from the center of the length to the diode device is implemented by a first resistor device disposed at the portion of the signal line between the pixel array region and the diode device, the resistance of the portion of the signal line from the center to the driving circuit is implemented by a second resistor device disposed at the portion of the signal line between the pixel array region and the driving circuit, a first resistance of the first resistor device and a second resistance of the second resistor device set at predetermined resistances, and when static electricity flows into the signal line, the static electricity flows preferentially to the diode device along the signal line and little static electricity flows to the driving circuit along the signal line wherein the first resistor device and the second resistor device are formed by implanting one of low-concentration N-type impurities and low-concentration P-type impurities into a semiconductor film.