LEDs generally require a stable power supply to turn on. The on-screen driver, or DOB, means removing the power supply or light source from the LED. However, this does not mean completely removing the driver or light source from the LED.
DOB LEDs, which are circular in shape and work with direct city electricity, 220 volts of Iranian electricity, and there is no need for a source between LEDs and city electricity, ie they no longer need an LED driver.