LED display high brightness and high energy saving depth res
2016-03-01 Industry News
How to saving energy for the LED display, I believe more and more people in the industry are mastered, which are from highlight LED lights, driving IC, switching power supply, the power consumption of the product design, intelligent system design and structure design of these aspects of energy conservation. Sure, how to find the best balance in this a few aspects, can achieve the best energy saving effect of LED display screen.
But I do not know when, don't know is what reason, perhaps in some factory, intentionally or not respected, the concept of high energy saving has been quietly "high brightness" fuzzy even replaced: under the precondition of the same cost, the brightness of the display more as the "energy saving", the more value! And gradually become the feedback to customer value "cost-effective" advantage.
Actually, in terms of to achieve good energy saving goal, excessive pursuit is high brightness and energy saving. Below, we will analyze the "high brightness" and "high" energy saving potential.
At present domestic more popular 12000 CD/m2 high brightness LED lamp basically is the use of large size LED chip. The large size of the LED chip is as a mainstream is widely adopted by most of the LED display manufacturers, and with no core technology. And it is well known, the brightness of the LED screen is proportional with the LED drive current. 12000 CD/m2 brightness is increase the LED drive current. However physical characteristics of leds will inevitable: high brightness leds with low attenuation, high stability characteristics. High attenuation is not conducive to long-term use requirements of LED display, also can become excessive pursuit of high brightness of birth defects, and that birth defects will be all the time, the multiplier effect, miraculously damage of the life and picture of the LED display.
High light PH16mm screen, for example, the technical parameters of high brightness leds show: 12000 CD/m2 brightness within 1.5-2 years will be a serious attenuation of 8000 CD/m2, the attenuation rate is above 20%. Some irresponsible manufacturers claim 2 years later when propaganda still more than 10000 CD/m2 brightness, and consumers to buy the screen, even two years later decay quickly, but suffer from contract has fulfilled end, complaining flared up. Actually consumers can verify in a simple way, is to take a look at a few has been running more than 2 years, and use more than 12 hours every day this high brightness of the display effect. What's more, from the 12000 CD/m2 brightness already dropped to 8000 CD/m2, its high working current situation has not changed, will be double its brightness attenuation speed, causing decay in the late several times faster, as a high attenuation of the display screen. And exists in a vicious cycle of intensity attenuation, cannot satisfy the requirement of use for a long time.
To avoid the light pollution, conform to the requirements of the environmental protection laws and regulations, the brightness of the day and night LED display using standard is not the same. As is known to all, reduce brightness to lose more or less gray level, the greater the brightness adjustment, gray level, the greater the loss. As a result, such as the initial brightness LED display the daytime a value of 12000 CD/m2 at night to 800 CD/m2 brightness, or extreme loss of gray level, makes night image quality is poor; Either fail to adjust brightness to the night to use the standard requirements, to form a high levels of light pollution.
It seems that the market had advocated the value of high brightness, as for the LED display manufacturing technology does not mean that leading technology, but a serious sacrifice screen life for high current high brightness.