Patent ID: 8791882
Filing Date: 2014-07-29
Classification: G09G

Abstract:
1. A display device of active matrix type, in which a plurality of emissive elements of current control type and a plurality of pixel circuits are formed as a matrix, configured to supply corrected gradation voltages for display to the pixel circuits, the display device comprising: the pixel circuits configured to supply currents to the emissive elements, each pixel circuit comprising an input circuit configured to receive an input current to said each pixel circuit, and a driving transistor configured to supply a current flowing through a respective emissive element, the current flowing through the respective emissive element being configured to be proportional to the input current; a measurement circuit, comprising a constant current supplying circuit configured to generate and supply one or more constant currents as input currents to the input circuit of said each pixel circuit in a time division manner, the measurement circuit A/D-converting output voltages of the constant current supplying circuit corresponding to the one or more constant currents, performing a predetermined operation on the A/D-converted data, and calculating data relating to electron mobility and threshold value of the driving transistor; and a gradation voltage supplying circuit configured to supply a corrected gradation voltage for display to said each pixel circuit, the corrected gradation voltage being data corrected on the basis of data calculated from the measurement circuit, wherein the gradation voltage supplying circuit multiplies data inputted thereto, which includes an original gradation voltage inputted to the display device and the data relating to the electron mobility of the driving transistor received from the measurement circuit; adds the threshold value of the driving transistor inputted from the measurement circuit to the result of the multiplication to generate the corrected gradation voltage; and supplies the corrected gradation voltage to said each pixel circuit.