An LED driver is a specialized electronic circuit that powers and controls LEDs in displays and other devices. In LCD displays it acts as the backlight driver: it delivers stable current and voltage to the LED backlight, ensuring safe and efficient operation, and adjusts brightness – usually via pulse-width modulation (PWM).
Depending on the design, the driver may handle one or multiple LED channels – for example in local dimming systems – and can be a separate module or be integrated with other components, such as the display controller. Modern drivers also support features like color temperature correction and power optimization, include protection against overheating, overload or short-circuit, and communicate with the main system via interfaces such as I²C or SPI.
Choosing the right driver is crucial for the display’s longevity, the uniformity and brightness of the backlight and efficient power management, especially in portable, industrial and high-brightness applications. Industrial designs also require EMC compliance and operation over wide temperature ranges. LED drivers are available as integrated circuits, PCB modules or as part of larger power systems.
