Display device

A display device comprising:

• A driving power supply line;
• a light-emitting element;
• a first transistor between the driving power supply line and the light-emitting element, the first transistor configured to control a current value from the driving power supply line to the light-emitting element;
• and
• a second transistor configured to apply a voltage determining a luminance of the light-emitting element to a first gate electrode of the first transistor, wherein
• the first transistor includes:
• the first gate electrode;
• a first insulating layer covering the first gate electrode;
• a first oxide semiconductor layer on the first insulating layer, and having a region overlapping the first gate electrode;
• and
• a second insulating layer covering the first oxide semiconductor layer,
• the second transistor includes:
• a second oxide semiconductor layer on the first insulating layer;
• the second insulating layer covering the second oxide semiconductor layer;
• and
• a second gate electrode on the second insulating layer, and having a region overlapping the second oxide semiconductor layer,
• the first oxide semiconductor layer includes a first channel region, a first high concentration impurity region, and a first low concentration impurity region between the first channel region and the first high concentration impurity region,
• the second oxide semiconductor layer includes a second channel region, a second high concentration impurity region, and a second low concentration impurity region between the second channel region and the second high concentration impurity region,
• a thickness of the first insulating layer is greater than a thickness of the second insulating layer,
• the thickness of the first insulating layer is 250 nm or more and 500 nm or less, and
• the thickness of the second insulating layer is 100 nm or more and 200 nm or less.