Pixel driving device, light emitting device and light emitting device driving control method

A light emitting device for emitting light in accordance with image data, comprising:

• a pixel array including a plurality of pixels and a plurality of signal lines, wherein each pixel includes a light-emitting element, a driving element and a capacitor, wherein the driving element has one end of a current path connected to one terminal of the light-emitting element, and electrically connected to each signal line, and the capacitor is connected between a control terminal of the driving element and the one end of the current path of the driving element;
• a first measuring circuit which acquires a threshold voltage of the driving element of each pixel, on the basis of a voltage value at the terminal of each signal line, wherein the voltage value is acquired after an initial voltage having a voltage that exceeds the threshold voltage of the driving element is applied to the terminal of each signal line and a predetermined relaxation time is elapsed after the initial voltage to each signal line is cut off;
• a second measuring circuit which acquires a voltage-current characteristics of the driving element of each pixel and acquires a current gain value of the driving element of each pixel by the acquired voltage-current characteristics of the driving element of each pixel and the threshold voltage of the driving element acquired by the first measurement circuit;
• and
• a correction processing circuit which corrects the image data to be supplied from an external source on the basis of the threshold voltage and the current gain of the driving element of each pixel acquired from the first measuring circuit and the second measuring circuit.

A light emitting device driving control method for emitting light in accordance with image data, wherein the light emitting device includes a pixel array having a plurality of pixels and a plurality of signal lines, wherein each pixel includes a light-emitting element, a driving element and a capacitor, wherein the driving element has one end of a current path connected to one terminal of the light-emitting element, and electrically connected to each signal line, and the capacitor is connected between a control terminal of the driving element and the one end of the current path of the driving element, the light emitting device driving control method comprising:

• an initial voltage applying step that applies an initial voltage having a voltage that exceeds the threshold voltage of the driving element to a terminal of each signal line;
• a threshold voltage acquiring step that acquires a voltage value at the terminal of each signal line when a predetermined relaxation time is elapsed after the initial voltage to each signal line is cut off as the threshold voltage of the driving element of each pixel;
• a voltage-current characteristics acquiring step that acquires a voltage-current characteristics of the driving element of each pixel;
• a current gain acquiring step that acquires a current gain value of the driving element of each pixel on the basis of the voltage-current characteristics acquired in the voltage-current characteristics acquiring step and the threshold voltage of the driving element acquired in the threshold voltage acquiring step;
• and
• a correction step that corrects the image data to be supplied from an external source on the basis of the acquired threshold voltage and the acquired current gain of the driving element of each pixel.