Display device and method for driving same

A display device having at least two operation modes including a low refresh mode and a high refresh mode, the display device comprising:

• a display portion including a plurality of data signal lines, a plurality of control scanning lines, and a plurality of pixel circuits arranged along the plurality of data signal lines and the plurality of control scanning lines;
• a data-side drive circuit configured to generate a plurality of data signals based on image data input from the outside and apply the plurality of data signals to the plurality of data signal lines;
• a scanning-side drive circuit configured to control the plurality of pixel circuits by selectively driving the plurality of control scanning lines, and
• a display control circuit configured to control the data-side drive circuit and the scanning-side drive circuit such that an image represented by the image data is displayed by the plurality of pixel circuits in one of the at least two operation modes, wherein
• each pixel circuit of the plurality of pixel circuits
• corresponds to one of the plurality of data signal lines,
• includes:
• a display element driven by a current;
• a holding capacitor;
• a driving transistor for controlling a supply amount of a current to the display element;
• a write control switching element for controlling whether to write a voltage of a corresponding data signal line as a data voltage to the holding capacitor;
• and a bias application circuit for applying, to the driving transistor, a bias voltage for reducing an influence of a hysteresis characteristic of the driving transistor on luminance of the display element, and
• is configured to apply the bias voltage from the bias application circuit to the driving transistor simultaneously or concurrently in the each pixel circuit when a voltage of a data signal line corresponding to the each pixel circuit is written as a data voltage to the holding capacitor of another pixel circuit,
• the display control circuit,
• in the low refresh mode, controls the data-side drive circuit and the scanning-side drive circuit such that one or a plurality of refresh frame periods during which a plurality of data voltages based on the image data is written to the plurality of pixel circuits, respectively, alternates with one or a plurality of non-refresh frame periods during which writing of the plurality of data voltages to the plurality of pixel circuits is stopped, and
• in the high refresh mode, controls the data-side drive circuit and the scanning-side drive circuit such that the refresh frame period during which the plurality of data voltages based on the image data is written to the plurality of pixel circuits, respectively, continues, and
• the scanning-side drive circuit,
• in each refresh frame period, controls the write control switching element such that the voltage of the corresponding data signal line is written as a data voltage to the holding capacitor in each of the plurality of pixel circuits in a predetermined data write period,
• in each non-refresh frame period, controls the bias application circuit such that the bias voltage is applied to the driving transistor in each of the plurality of pixel circuits during a predetermined bias period, and
• controls the write control switching element and the bias application circuit such that when new image data is input from the outside during any one of the non-refresh frame periods in the low refresh mode, a new refresh frame period is started at a predetermined time point before an end time point of the any one of the non-refresh frame periods and a plurality of data voltages based on the new image data is written to the plurality of pixel circuits, respectively, and such that in a pixel circuit in which the bias voltage is yet not applied to the driving transistor during the any one of the non-refresh frame periods among the plurality of pixel circuits, the bias voltage is applied to the driving transistor during the bias period from the predetermined time point to the end time point.