Patent ID: 8259098
Filing Date: 2012-09-04
Classification: G09G

Abstract:
1. A display apparatus, comprising: an active matrix substrate with an array of multiple pixel circuits and a data line provided with respect to each pixel circuit column for supplying a predetermined signal, each pixel circuit having a light emitting element, a drive transistor with a source terminal connected to an anode terminal of the light emitting element to apply a drive current to the light emitting element, a capacitor element connected between a gate terminal and the source terminal of the drive transistor, a gate connection switch connected between the gate terminal of the drive transistor and a voltage source that supplies a predetermined voltage, and a source connection switch connected between the source terminal of the drive transistor and the data line; a scan drive unit for sequentially selecting pixel circuit rows and turning ON the source connection switches of pixel circuits in the selected pixel circuit row; a source drive unit having a current value acquisition unit for supplying a preset first measuring voltage to the source terminal of the drive transistor via the data line and source connection switch, acquiring a first voltage variation at the source terminal of the drive transistor when a capacitive load connected to the source terminal of the drive transistor is charged by a current flowing through the drive transistor by the supply of the first measuring voltage, acquiring a first current value with respect to the drive current of the drive transistor based on the first voltage variation, supplying a preset second measuring voltage to the source terminal of the drive transistor via the data line and source connection switch, acquiring a second voltage variation at the source terminal of the drive transistor when the capacitive load connected to the source terminal of the drive transistor is charged by a current that flows through the drive transistor by the supply of the second measuring voltage, and acquiring a second current value with respect to the drive current of the drive transistor based on the second voltage variation, a characteristic value acquisition unit for acquiring threshold voltage based and mobility based characteristic values of the drive transistor based on the first measuring voltage, second measuring voltage, first current value, and second current value, and a data signal output unit for outputting a data signal based on the characteristic values obtained by the characteristic value acquisition unit and a drive voltage of the drive transistor corresponding to the amount of emission of the light emitting element to the source terminal of the drive transistor via the data line and source connection switch; a characteristic value storage unit for storing characteristic values of the drive transistor of each pixel circuit; and a control unit for displaying an image based on a data signal with respect to each frame by causing the scan drive unit to repeat the selection from the first to last pixel circuit row, wherein: the current value acquisition unit is a unit that sequentially switches and selects some of pixel circuits in a pixel circuit row selected by the scan drive unit with respect to each frame and obtains the first and second current values of each selected pixel circuit; the characteristic value acquisition unit is a unit that obtains the characteristic values of each pixel circuit selected by the current value acquisition unit and outputs the obtained characteristic values to the characteristic value storage unit to update previously stored characteristic values of each selected pixel circuit; and the data signal output unit is a unit that outputs, for each selection pixel circuit selected by the current value acquisition unit, a data signal based on the characteristic values obtained by the characteristic value acquisition unit when selected and a drive voltage of the drive transistor corresponding to the amount of emission of the light emitting element to the source terminal of the drive transistor of each selection pixel circuit via the data line and source connection switch and outputs, for each non-selection pixel circuit not selected by the current value acquisition unit, a data signal based on the characteristic values stored in the characteristic value storage unit when selected last time and a drive voltage of the drive transistor corresponding to the amount of emission of the light emitting element to the source terminal of the drive transistor of each non-selection pixel circuit via the data line and source connection switch.