Detailed explanation: Ultra low dropout LED driver makes LED display energy saving 32.8%

Why LED displays can be widely used, my summary is the following:

1. Extensibility: The larger the LCD screen is, the higher the investment in the production line equipment. The increase in the size of the LED display is very easy, just like building blocks. The resolution is also convenient to implement according to user needs.

2. Full color: bulbs, neon lights, etc. are all monochrome, LEDs achieve a combination of RGB three primary colors.

3. High reliability: LED is solid lighting, high reliability, unlike neon tubes, bulbs and the like that require vacuum tubes.

4. Long life: LED chip theoretical life can reach 100,000 hours, actual service life is more than 30,000 hours

5. Environmentally friendly: LED itself is energy-saving and pollution-free

The biggest problem that LEDs are currently experiencing is heat dissipation, and the LED display is the same. LED display power consumption is very large, and a considerable part of the energy is wasted on heat. Fever brings the following problems:

1. Wavelength drift: Wavelength drift can cause problems with color correction. When the LED is at low temperature and high temperature, the wavelength drift is relatively large. According to the experimental data, the wavelength changes by 0.2-0.3 nm for every degree of temperature change.

2. Output brightness reduction: The temperature change per degree Celsius causes a 1% change in output brightness, with the red light being most affected.

The above figure is the test data. From the curve of the red light, it can be seen that the brightness from -40 degrees 180% to 120 degrees is less than 50%, that is, the brightness of the red light is reduced by nearly two-thirds. Relatively speaking, the brightness of the blue and green lights is not as strong as the temperature, especially the blue light. A problem arises when the temperature rises, and the brightness of the LEDs of different colors is different.

3. Temperature rise leads to shortened LED life: According to a US laboratory data, the junction temperature rises from 63C to 74C, and the LED lifetime is reduced from 36,000 hours to 16,000 hours.

4. Excessive heat dissipation components result in increased system cost.

5. Waste energy and increase user costs.