The reasons why LED screens are widely used:

Malleability

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

Full Color

Light bulbs, neon lights, etc. are all monochromatic, and LEDs have realized the combination of the three primary colors of RGB.

High reliability

LEDs are solid and highly reliable, while neon tubes and bulbs require vacuum tubes.

Long life

The theoretical life of the LED chip can reach 100,000 hours, and the working life is more than 30,000 hours.

Environmentally friendly

LED itself is an energy-saving and pollution-free product.

The biggest problem currently encountered by LED displays is heat dissipation and the same for LCD displays. The power consumption of the LED display is very large, and a considerable part of the energy is wasted on heat. Fever can cause the following problems:

Wavelength shift

Wavelength drift can cause problems in color correction. The wavelength drift of LEDs is relatively large at low and high temperatures. According to the experimental data, for every degree of temperature change, the wavelength changes by 0.2-0.3nm.

Reduced output brightness

The temperature change per degree Celsius results in a 1% change in output brightness, of which the red light is most affected. From -40 degrees 180% brightness to 120 degrees brightness is less than 50%, that is to say, the brightness of the red light is reduced by nearly two-thirds. Relatively speaking, the brightness of the blue light and the green light has less temperature influence, especially the blue light. When the temperature rises, a problem arises. The brightness of LEDs of different colors is not the same.

Temperature rise leads to shortened LED life

According to data from a laboratory in the United States, the temperature increased from 63C to 74C, and the LED lifetime decreased from 36,000 hours to 16,000 hours.

Excessive heat dissipation components lead to higher system costs

Too many heat-dissipating components lead to higher system costs.

Waste energy, increase user cost

It wastes energy and increases user costs.

So where does the heat come from? From the power supply to the LED lamp, to the LED driver, and then to the adjustable resistance, the heating part includes the LED lamp, the LED driver, and the LED connection. Let’s take 5V power supply as an example:

Power supply voltage: 5V;

LED: LED G/B Vfwd=3.2V, LED R Vfwd=2V

1. The LED luminous efficiency is about 20%, and the LED heating accounts for 50% of the total heating
2. The controller and connection account for about 5% of the total heat generation
3. Drive voltage drop: 1.8V(G/B) or 3V(R) voltage drop, the heating of the drive part accounts for more than 45% of the total heating.

The heating of the LED lamp needs to improve the luminous efficiency of the LED, and the heating of the controller and the connection is less, and there is not much room for improvement. There is a lot of room for improvement in the heat generation of the driving part, and it is also the part we look forward to improving.