Element substrate and light emitting device

A light emitting device comprising:

• a first transistor;
• a second transistor;
• a light emitting element;
• a capacitor;
• and
• a power supply line;
• wherein one of source and drain of the first transistor is electrically connected to the light emitting element,
• wherein another of source and drain of the first transistor is connected to one of source and drain of the second transistor,
• wherein another of source and drain of the second transistor is connected to one electrode of the capacitor through the power supply line, and
• wherein a semiconductor layer of the first transistor is curved so that a L/W (channel length/channel width) of the first transistor is larger than a L/W (channel length/channel width) of the second transistor.

A light emitting device comprising:

• a first transistor;
• a second transistor;
• a light emitting element;
• a capacitor;
• and
• a power supply line;
• wherein one of source and drain of the first transistor is electrically connected to the light emitting element,
• wherein another of source and drain of the first transistor is connected to one of source and drain of the second transistor,
• wherein another of source and drain of the second transistor is connected to one electrode of the capacitor through the power supply line,
• wherein a semiconductor layer of the first transistor is curved so that a L/W (channel length/channel width) of the first transistor is larger than a L/W (channel length/channel width) of the second transistor, and
• wherein the second transistor is configured to be operated in a linear region.