Patent ID: 7782284

Claim:
A video signal line drive circuit connected to a display portion for displaying an image, the circuit comprising: a plurality stage of video signal line drive units for converting, by an error diffusion method, a gradation level indicated by an externally inputted image signal representing an original image, and applying a video signal indicating a gradation level after the conversion to video signal lines each included in a predetermined area of the display portion, wherein each video signal line drive unit in each stage includes an error diffusion operation circuit for generating a video signal that is to be applied to self-stage area video signal lines, which are video signal lines connected to self-stage, based on self-stage area image data and at least either previous stage area image data or subsequent stage area image data, the self-stage area image data being image data representing the original image for the video signal that is to be applied to the self-stage area video signal lines, the previous stage area image data being image data representing the original image for the video signal that is to be applied to previous stage area video signal lines, which are a predetermined number of near-boundary video signal lines among all video signal lines connected to the video signal line drive unit in a previous stage, the subsequent stage area image data being image data representing the original image for the video signal that is to be applied to subsequent stage area video signal lines, which are a predetermined number of near-boundary video signal lines among all video signal lines connected to the video signal line drive unit in a subsequent stage.