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Analysis of LED display "high brightness" and "high energy"

Jul 15, 2017

How to energy-saving LED display, I believe that more and more people are already well aware of the industry, nothing more than from the bright LED lights, driver IC, switching power supply, product power design, intelligent energy-saving system design and structural energy-saving design These aspects are proceeding. Admittedly, how to find in these areas * good balance point, will be able to achieve * good LED display energy saving effect.

But I do not know when, do not know what reason, perhaps in some manufacturers intentionally or unintentionally, the concept of high energy is quietly "high brightness" fuzzy or even replaced: the same cost under the premise of the display The higher the brightness the more "energy", the more value! And gradually become their feedback to the customer value "cost" advantage.

In fact, in order to achieve good energy-saving goals, the excessive pursuit of high brightness is deviated from the energy-saving. Here, we have to analyze the "high brightness" and "high energy" potential relationship.

At present, the more popular domestic 12000cd / m2 high-brightness LED lights are basically using large-size LED chip. This large-size LED chip is the market mainstream as most of the LED display manufacturers generally used, there is no core technology at all. And well-known, LED screen brightness and LED lamp drive current is proportional to. 12000cd / m2 brightness is nothing less than the LED driver's current. However, the physical characteristics of LED lights will be inevitable: high brightness LED lights must be accompanied by high attenuation, low stability characteristics. High attenuation is not conducive to the long-term use of LED display requirements, but also become too much to pursue high-brightness inherent defects, and this inherent defects will be time-consuming, multiplier effect damage to the LED display life and picture effects.

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To highlight the PH16mm display, for example, this high-brightness LED lights technical parameters show: 12000cd / m2 brightness in the 1.5-2 years will be a serious attenuation of 8000cd / m2, the annual decay rate of 20% or more. And some irresponsible manufacturers in the publicity when the claim that 2 years after the brightness is still up to 10000cd / m2 or more, and consumers buy this screen, 2 years even if the attenuation soon, but suffer from the contract has been completed, complain The door. In fact, consumers can use a very simple way to verify, is to look at a few have been running for more than 2 years, and the use of more than 12 hours a day this high brightness display effect. More seriously, in the brightness from 12000cd / m2 has been reduced to 8000cd / m2 after its high operating current situation has not changed, will be more doubled its brightness attenuation speed, resulting in the late deceleration speed several times, a high attenuation Display screen. And there is a vicious cycle of brightness attenuation, simply can not meet the requirements of long-term use.

In order to avoid light pollution, in line with environmental regulations, LED display day and night brightness standards are not the same. As we all know, reduce the brightness more or less will lose the gray, the greater the brightness adjustment, the greater the loss of gray. Therefore, if the LED display during the day the initial brightness value is set to 12000cd / m2, to the night down to 800cd / m2 brightness, or extreme loss of gray, making the night picture quality becomes poor; or brightness can not be adjusted to the night The use of the standard requirements, and the formation of heavy light pollution.

In view of this, the market by the sub-high brightness of the value of LED display manufacturing technology does not mean that the technology leader, but a serious sacrifice display life in exchange for high current high brightness. On the contrary, it is inevitable that people are flashy, stretched too.