Method for maintaining LED brightness, LED driving circuit and display device

A display device comprising a LED driving circuit and a LED, wherein the LED driving circuit comprises:

• a first transistor, a second transistor, a third transistor, a fourth transistor and a capacitor;
• a drain of the first transistor and one terminal of the capacitor are electrically connected to a first reference node;
• a source of the second transistor, a gate of the first transistor and the other terminal of the capacitor are electrically connected to a second reference node;
• a source of the first transistor, a source of the third transistor and a source of the fourth transistor are electrically connected to a third reference node;
• a gate of the second transistor and a gate of the third transistor are electrically connected to a fourth reference node;
• a drain of the second transistor is electrically connected to a data signal input terminal;
• a drain of the third transistor is electrically connected to a detection signal receiving terminal;
• a drain of the fourth transistor is electrically connected to a detection current input terminal, and a gate of the fourth transistor is electrically connected to a detection control voltage terminal;
• the fourth reference node is electrically connected to a scan signal input terminal;
• and
• the LED is driven by the first transistor.