Patent ID: 7932881

Claim:
An image display device, comprising on a substrate: a plurality of pixel circuits each including a light-emitting element and a circuit element which conducts quantitative control of an electric current supplied to the light-emitting element, wherein the pixel circuits are arrayed in a matrix form; a data driver for supplying an image signal voltage to the plurality of pixel circuits; a plurality of data lines, each of the data lines supplying the image signal voltage to the plurality of pixel circuits; a scanning circuit that generates a pulse signal with each arrival of a vertical scanning period; a plurality of gate lines intersecting with the data lines, each of the gate lines transmitting the pulse signal to the plurality of pixel circuits; a waveform generator that generates a plurality of triangular-wave voltages each having different phases or a plurality of stair-step sweep voltages; and a plurality of triangular wave signal lines intersecting with the data lines, each of the triangular wave signal lines supplying one of the triangular wave voltages or one of the stair-step sweep voltages to the plurality of pixel circuits, wherein the circuit element controls the electric current supplied to the light-emitting element by comparing one of the triangular-wave voltages or one of the stair-step sweep voltages and the image signal voltage at the pulse signal input to the pixel circuit, wherein the waveform generator comprises: a loop-form resistive wiring on the substrate, wherein the plurality of triangular wave signal lines are connected to the loop-form resistive wiring to have spatial phases; a plurality of connection nodes provided on the loop-form resistive wiring; a plurality of first voltage supply electrodes for supplying a maximum voltage of the triangular-wave voltage or the stair-step sweep voltage; a plurality of second voltage supply electrodes for supplying a minimum voltage of the triangular-wave voltages or the stair-step sweep voltage; a plurality of voltage switches, each said voltage switch associated with a connection node, comprising of two active elements for connecting one of the plurality of first and one of the plurality of second voltage supply electrodes with the associated connection node; and at least one shift register which control the voltage switches; wherein connection positions of the plurality of first and plurality of second voltage supply electrodes with the plurality of connection nodes via the plurality of voltage switches are sequentially shifted by the at least one shift register at a same rate, such that the plurality of triangular-wave voltages each having different phase or the plurality of stair-step sweep voltages are generated at the plurality of connection nodes of the triangular wave signal lines on the loop-form resistive wiring.