Patent ID: 8130252

Claim:
An optical head that represents gray scales of an image by expressing gray scales of pixels, which belong to a block, with binary values, the block being constituted by n pixels (n is a natural number of 2 or more) in a first direction and m pixels (m is a natural number) in a second direction, comprising: a plurality of light emitting devices that extend in the first direction and emit light with luminance in accordance with a driving current; a plurality of driving transistors that are provided corresponding to the plurality of light emitting devices and that supply the driving current; a potential line that applies a source potential or a gate potential to the plurality of driving transistors; and a plurality of driving circuits that are provided corresponding to the plurality of driving transistors and that supply a driving control signal to specify an ON state or an OFF state for gates of the driving transistors, wherein the driving circuits each includes: a line having an intersection at which the line intersects the potential line; and a logic circuit that generates the driving control signal based on image data to instruct turning-on or turning-off of the light emitting devices, the line being included in the logic circuit and carrying the image data, and wherein the logic circuits of the plurality of driving circuits invert logic levels of the lines at the intersections every n natural number of intersections extending in the first direction corresponding to the block.