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LED display high brightness and high energy saving depth
How to save energy on LED display, I believe more and more people in the industry have been well aware of it, just from high-brightness LED lights, drive ICs, switching power supplies, product power consumption design, intelligent energy-saving system design and structural energy-saving design These aspects are being implemented. It is true that how to find the best balance point in these aspects can achieve the best LED display energy saving effect. But I don't know when it started, I don't know why, maybe it is intentionally or unintentionally promoted by some manufacturers. The concept of high energy saving is quietly blurred or even replaced by high brightness: under the same cost, the brightness of the display is more The higher the energy, the more value! And gradually become the value-for-money advantage they feedback to customers. In fact, in order to achieve good energy-saving goals, excessive pursuit of high brightness is contrary to energy conservation. Below, let's analyze the potential relationship between high brightness and high energy efficiency. At present, the more popular 12000 cd/m2 high-brightness LED lamps in China basically use large-size LED chips. 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/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. High attenuation is not conducive to the long-term use of LED display, but also becomes a congenital defect of excessive pursuit of high brightness, and this inherent defect will damage the life and picture effect of LED display all the time and multiplier effect. Taking the high-brightness PH16mm display 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 is over 20. Some irresponsible manufacturers announced that after 2 years, the brightness still reached 10,000 cd/m2 or more, and consumers bought the screen. Even after 2 years, even if the attenuation is very fast, but the contract has been fulfilled, the complaint is not The door is over. In fact, consumers can verify in a very simple way, that is, look at the effect of several high-brightness displays that have been running for more than 2 years and use more than 12 hours a day. What is more serious is that after the brightness has dropped from 12000 cd/m2 to 8000 cd/m2, 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. Display. Moreover, 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 gradation, 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/m2 during the day, or when the brightness is reduced to 800 cd/m2 at night, the gradation is extremely lost, so that the night picture quality becomes poor; or the brightness cannot be adjusted to the nighttime. The standard requirements used, resulting in severe light pollution. From this point of view, the high value of the market is highly valued. In terms of LED display manufacturing technology, it does not mean that the technology is leading, but a high current and high brightness that is severely sacrificed in exchange for the display life. On the contrary, it is inevitable that people will be sloppy and stretched.