Patent ID: 7023232
Filing Date: 2006-04-04
Classification: G09G

Abstract:
1. An image display device, comprising: a plurality of light-emitting diodes arranged by a predetermined arrangement on an image display face; a voltage detection portion for applying a constant current to said plurality of light-emitting diodes in an off region at a forward voltage or less in accordance with an input of a signal indicating a defect detection mode, and detecting a voltage between terminals of a light emitting diode arising when the constant current flows there through; and a defect detection portion for electrically detecting a defect from said plurality of light-emitting diodes based on a detection result of said voltage detection portion, wherein: said voltage detection portion is provided to each of a plurality of drive circuits connected in series in one direction for respectively driving a predetermined number of said light-emitting diodes; and said defect detection portion transfers data indicating said voltages between terminals of said light-emitting diodes serially between a plurality of drive circuits in each line of said drive circuits in the horizontal direction, and based on data output from a drive circuit on the final stage being added with information of the voltages between terminals every time it transfers between the drive circuits, detects said defect in every said line in the horizontal direction.