Burst dimming is a technique used in LED lighting systems to reduce flickering and improve the quality of the light output. Flickering can occur in LED lights because they operate on direct current (DC) while the alternating current (AC) supply is used to power them. Burst dimming helps to reduce the flicker by temporarily increasing the current in a series of short bursts or pulses. In burst dimming, the LED driver sends short pulses of current to the LED array at a high frequency, typically in the range of several kilohertz to several tens of kilohertz. The pulse width and frequency are adjusted to control the brightness level of the LEDs. The high frequency of the pulses ensures that the LED light output appears continuous, without any noticeable flicker.
Burst dimming is commonly used in applications where flicker-free lighting is important, such as in high-speed video recording, medical equipment, and other sensitive environments. This technique is often employed to enhance the display's contrast ratio and reduce power consumption. By selectively pulsing the backlight during the display's refresh cycle, dark areas of the image can appear darker, resulting in improved black levels and overall picture quality. Burst dimming is commonly utilized in LCD panels with LED backlights, as LEDs can respond quickly to rapid changes in brightness. It is particularly beneficial in applications where high contrast and energy efficiency are desired, such as televisions, computer monitors, and mobile devices.
The on/off rate is nominally 100Hz to 300Hz. The higher the ratio of on-time to off-time, the brighter the lamps will be. Because of CCFL response times, on-time to off-time ratios of less than 1% are not practical.
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