Image display device

An image display device having a display unit comprising a plurality of display elements, a data signal line configured to input a display signal voltage to the display unit, and a display control unit configured to control the display signal voltage, the image display device comprising:

• a detection power source;
• a switch configured to cause current from the detection power source to flow via a detection signal line to the display elements of the plurality of display elements;
• a detection circuit configured to detect a characteristic of each display elements of the plurality of display elements if the current is flowing to the display elements of the plurality of display elements;
• and
• a detection information storage circuit configured to store information detected by the detection circuit, the information being usable to compensate the display signal voltage;
• wherein the data signal line and the detection signal line comprise a common signal line to be switched by a switching circuit,
• wherein the detection circuit comprises an A/D converter, the A/D converter being configured to the characteristic of the display element from an analog value to a digital value, and
• wherein the detection circuit is configured to detect the characteristic of each display element of the plurality of display elements by:
• performing a first detection operation of detecting the characteristic of each display element included in a first group of display elements of the plurality of display elements sequentially, the first detection operation being performed using a first reference voltage range between a first upper reference voltage and a first lower reference voltage applied to the A/D converter;
• determining a second upper reference voltage based on a maximum characteristic value of the characteristics among the characteristics detected of the display elements of the first group of display elements;
• determining a second lower reference voltage based on a minimum characteristic value of the characteristics among the characteristics detected of the display elements of the first group of display elements;
• performing a second detection operation of detecting the characteristic of each display element of the first group of display elements, the second detection operation being performed under a common temperature condition with the first detection operation, the second detection operation being performed using a second reference voltage range between the second upper reference voltage and the second lower reference voltage applied to the A/D converter, the second reference voltage range being different from the first reference voltage range;
• and
• outputting the characteristic of each display element of the first group of display elements detected during the second detection operation to the detection information storage circuit to be stored as the information detected by the detection circuit and used for compensating the display signal voltage.