Display device and method for driving same

A method for diving a display device that includes a plurality of scanning signal lines extending in a row direction, a plurality of data signal lines extending in a column direction and intersecting the plurality of scanning signal lines, a power supply line including first and second power supply voltage lines, and a plurality of pixel circuits arranged in a matrix form along the plurality of scanning signal lines and the plurality of data signal lines, the method comprising:

• an image data correction step of generating driving image data by correcting input image data that represents an image to be displayed;
• a data signal line drive step of driving the plurality of data signal lines based on the driving image data;
• and
• a scanning signal line drive step of selectively driving the plurality of scanning signal lines,
• wherein the first power supply voltage line includes a trunk wire, and a plurality of branch wires diverging from the trunk wire and arranged along the plurality of data signal lines, respectively,
• each of the pixel circuits
• corresponds to any one of the plurality of scanning signal lines, corresponds to any one of the plurality of data signal lines, and corresponds to any one of the plurality of branch lines,
• includes a display element driven by a current, a holding capacitor configured to hold a data voltage for controlling a drive current of the display element, and a drive transistor configured to control the drive current of the display element in accordance with the data voltage held in the holding capacitor, and
• is configured such that a voltage of a corresponding data signal line is written in the holding capacitor as a data voltage when a corresponding scanning signal line is selected,
• in each of the pixel circuits,
• a first conductive terminal of the drive transistor is connected to a branch wire corresponding to the each pixel circuit,
• a second conductive terminal of the drive transistor is connected to the second power supply voltage line via the display element, and
• a control terminal of the drive transistor is connected to the corresponding branch wire via the holding capacitor,
• the image data correction step includes
• a current estimation step of determining an estimated value of a current that flows in the trunk wire when data voltages are written in pixel circuits corresponding to any one of the plurality branch wires, and
• a driving data generation step of determining a voltage drop at a connection point between the trunk wire and the any one branch wire based on the estimated value of the current and correcting image data for each of the pixel circuits corresponding to the any one branch wire in the input image data in accordance with the voltage drop, so as to generate image data corresponding to a data voltage to be written in the each pixel circuit out of the driving image data,
• in the image data correcting step, the input image data is input sequentially for each frame,
• in the current estimation step,
• sum of estimated values of currents supplied from the power supply line to respective preceding pixel circuits corresponding to any one of scanning signal lines selected before the scanning signal line corresponding to the pixel circuits in which the data voltages are to be written, is calculated for each row as a present-frame current value, and
• sum of estimated values of currents supplied from the power supply line to respective succeeding pixel circuits corresponding to any one of scanning signal lines selected after the scanning signal line corresponding to the pixel circuits in which the data voltages are to be written, is calculated for each row as an immediately-preceding-frame current value, and
• in the driving data generation step, the voltage drop is calculated based on the present-frame current value and the immediately-preceding-frame current value.