Analysis of LED Display "High Brightness" And "High Energy Saving"

How to save energy on LED display, I believe more and more people in the industry have been well aware of it, just implemented from high-brightness LED chips, drive ICs, switching power supplies, product power consumption design, intelligent energy-saving system design and structural energy saving design. It is true that how to find the best balance point in these aspects can achieve the best energy saving effect of LED display.

But I don't know when it started and don't know why, maybe it is intentionally or unintentionally promoted by some manufacturers. The concept of high energy efficiency is quietly replaced by "high brightness". Under the same cost, the higher the brightness of LED display screen, the more "energy saving", the more value! And gradually become the advantage of extra value "price-performance" to feedback customers.

In fact, in order to achieve goals on good energy saving, excessive pursuit of high brightness is contrary to energy conservation. Below, let's analyze the potential relationship between "high brightness" and "high energy saving".

At present, the more popular 12000 cd/sqm high brightness LED lamps basically use large size LED chips in china. This large size LED chip is widely used by most LED display manufacturers as the mainstream of the market, and there is no core technology. As is well known, the brightness of the LED screen is proportional to the drive current of the LED lamp. The brightness of 12000 cd/sqm is nothing more than increasing the driving current of the LED lamp. However, the physical characteristics of LED lamps will be inevitable, and high brightness LED lamps will inevitably be accompanied by high attenuation and low stability. High attenuation go against to the long term use of LED display, but also becomes a congenital defect that excessively pursues high brightness. These congenital defects will damage the life and picture effect of LED display all the time.

Taking the high brightness P16 LED display as an example, the technical parameters of this high brightness LED lamp show that the brightness of 12000cd/sqm will be seriously attenuated to 8000cd/sqm within 1.5-2 years, and its annual attenuation rate is over 20%. Some irresponsible manufacturers told that the brightness still reached 10,000 cd/sqm or more after 2 years. Consumers bought the LED screen, even if the attenuation is very fast after 2 years, there is useless for their complaint as the contract has been fulfilled. In fact, consumers can verify in a very simple way, that is, look at the effect of several high brightness LED displays that have been running for more than 2 years and use more than 12 hours a day. What is more, After the brightness has dropped from 12000 cd/sqm to 8000 cd/sqm, the high operating current has not changed, and the speed of brightness decay is further multiplied, so that the later decay speed is several times faster and becomes high attenuation LED display. So it exists in the vicious cycle of brightness decay, and it cannot meet the requirements of long term use.

In order to avoid light pollution and comply with environmental regulations, the brightness standard of LED display screens used day and night is not the same. It is well known that reducing the brightness will more or less lose gray level, and the greater the brightness adjustment, the greater the gradation loss. Therefore, if the initial brightness value of the LED display is set to 12000 cd/sqm during the day, or when the brightness is reduced to 800 cd/sqm at night, the gradation is extremely lost, so that the night picture quality becomes poor, or the brightness cannot be adjusted to the standard requirements of nighttime resulting in severe light pollution.

From this, the high value was promoted in the market, in terms of LED display manufacturing technology, it does not mean that the technology is leading, but is severely sacrificed the life of LED display in exchange for a high current and high brightness. On the contrary, it is inevitable to make people feel having white elephant and making overstretched.