Patent ID: 7518577
Filing Date: 2009-04-14
Classification: G09G

Abstract:
1. An image display device comprising: pixels arranged in a matrix; signal lines; gate lines; power lines; on/off control lines; a signal voltage input circuit; on/off changeover switches; a first shift register circuit; a second shift register circuit; current measuring circuits; and a power supply circuit, wherein each pixel comprises a pixel transistor, a capacitor, a driving transistor, an on/off control switch, and a light emitting element, a gate of a pixel transistor in each pixel located in the same row is connected to the same gate line among the gate lines, a gate of an on/off control switch in each pixel located in the same row is connected to the same on/off control line among the on/off control lines, a gate of a driving transistor and a first end of a capacitor in each pixel located in the same column is connected to the same signal line among the signal lines through a source-drain path of a pixel transistor in each pixel located in the same column, a second end of a capacitor in each pixel located in the same column is connected to the same power line among the power lines, each light emitting element is connected between the power line and a common terminal through a source-drain path of the driving transistor and a source-drain path of the on/off control switch in each pixel, the power lines are connected to the power supply circuit through the current measuring circuits, the second shift register circuit turns off all the on/off control switches through the on/off control lines, the first shift register circuit turns on all the pixel transistors through the gate lines while the signal voltage input circuit inputs signal voltages of a white level into all the signal lines, and then the first shift register circuit turns off the pixel transistors through the gate lines, the second shift register circuit sequentially scans the on/off control lines, and the current measuring circuits measure drive currents of the power supply lines.