It is believed that more and more people in the industry know how to save energy in LED displays. It is nothing more than highlighting LED lights, driver ICs, switching power supplies, product power consumption design, intelligent energy-saving system design and structural energy-saving design. implementation of these aspects. It is true that how to find the best balance in these aspects can achieve the best energy-saving effect of LED display.
But I don't know when it started, I don't know why, maybe under the conscious or unintentional advocacy of some manufacturers, the concept of high energy saving has been quietly blurred or even replaced by "high brightness": under the premise of the same cost, the display The higher the brightness, the more "energy-saving" and value-added! It has gradually become a value-for-money "cost-effectiveness" advantage that they feedback to customers.
In fact, in order to achieve a good energy saving goal, excessive pursuit of high brightness is contrary to energy saving. The editor of Chengdu LED display screen will take you to analyze the potential relationship between "high brightness" and "high energy saving".
At present, the more popular 12000cd/m2 high-brightness LED lamps in China basically use large-sized LED chips. This large-sized LED chip is widely used by most LED display manufacturers as the mainstream of the market, and there is no core technology at all. As we all know, the brightness of the LED screen is proportional to the driving current of the LED lamp. The brightness of 12000cd/m2 is nothing more than increasing the driving current of the LED lamp. However, the physical characteristics of LED lamps will be inevitable: high-brightness LED lamps must be accompanied by high attenuation and low stability characteristics. High attenuation is not only not conducive to the long-term use requirements of LED displays, but also becomes a congenital defect of excessive pursuit of high brightness, and this congenital defect will damage the life and picture effects of LED displays all the time and in a multiplier effect.
Taking the high-brightness PH16mm display screen as an example, the technical parameters of this high-brightness LED lamp show that the brightness of 12000cd/m2 will be seriously attenuated to 8000cd/m2 within 1.5-2 years, and its annual attenuation rate will reach more than 20 percent . Some irresponsible manufacturers claim that the brightness will still reach more than 10000cd/m2 after 2 years, and consumers buy this kind of screen, even if the attenuation is very fast after 2 years, but the contract has been fulfilled, and there is no complaint. door. In fact, consumers can use a very simple way to verify, that is, to see the effect of several high-brightness display screens that have been running for more than 2 years and used for more than 12 hours a day. What's more serious is that after the brightness has dropped from 12000cd/m2 to 8000cd/m2, its high working current has not changed, and the speed of its brightness attenuation will be doubled, resulting in the later attenuation speed. display. Moreover, it exists in a vicious circle of brightness attenuation, which cannot meet the requirements of long-term use at all.
In order to avoid light pollution and meet the requirements of environmental protection regulations, the brightness standards of LED displays are not the same day and night. As we all know, reducing the brightness more or less loses grayscale, and the greater the brightness adjustment, the greater the loss of grayscale. Therefore, if the initial brightness value of the LED display screen is set to 12000cd/m2 during the day, when the brightness is lowered to 800cd/m2 at night, either the grayscale is extremely lost, making the image quality at night very poor; or the brightness cannot be adjusted to the night time. Use of the standard requirements, and the formation of heavy light pollution.
From this point of view, the value of high brightness in the market does not mean technological leadership in terms of LED display manufacturing technology, but a high current and high brightness in exchange for seriously sacrificing the life of the display. On the contrary, it is unavoidable to make people feel flashy and stretched.
