Bringing up LEDs, there are certainly many people who are very familiar with them. Today's LEDs are everywhere, and they have a wide range of applications in LCD monitors, TVs, large screens, projections, and lighting. People seem to be familiar with LEDs. It is. In the liquid crystal display industry, LEDs have gradually replaced some CCFL backlights, and they have left some internal injuries. This is a "secret" that many consumers do not understand.
Let’s talk about what is “LED displayâ€. Strictly speaking, there is no such product. However, under the vigorous promotion of various channels, many consumers think that LED display is the most cutting-edge product at present, and its display effect. It is also the best. In fact, this is not the case. LED displays should be called LED-backlit displays. Because LEDs are not devices for imaging, they only function as light. The imaging devices are LCD, MVA or IPS panels. For convenience, the concept of "LED display" can be used temporarily.
LED is not used as a display backlight at the beginning, but with the continuous development of LED technology in recent years, and the gradual decline in cost, it replaced the original CCFL backlight, becoming the mainstream backlight choice, of course, LED as Backlights also have many grades, such as high-end products with RGBLED, while low-end products often use WLED backlight, WLED is the backlight of the LED display we see every day.
What is an LED backlight
LED full name LED (English: Light-EmittingDiode, referred to as LED), although the name of this product often appears in front of the public in recent years, but it is not a new technology, it was developed as early as 1962, only However, the early LEDs can only emit single light, and the brightness is relatively low, so the application market is relatively narrow.
LED backlights are now widely used
Until the last few years, LEDs began to erupt, and the domestic LED industry is booming. Not only has there been a breakthrough in technology, but because of the large number of enterprises, the price has gradually decreased, and finally there is a wide application market, nowadays everywhere. Visible LED TVs, LED displays, LED projectors, and LED lighting are all variants of LED applications.
What are the benefits of LED? The first is long life and strong stability. This can be felt from the street LED lights. It is often exposed to the sun and the sun, but it can still be used for many years, followed by energy saving. Its operating current is small, so the power consumption is lower than the traditional light source.
The drawbacks of LED backlight display
Undoubtedly a very good light source, low cost, good energy, and durable, which is the reason for LED backlight application in the display industry, but LED light source application also has its own drawbacks in the display industry, that is, damage vision, and its more More than the past CCFL backlight, this is the internal injury of the display backlight evolution.
Short-wave blue light is very harmful to people's eyes
Why LED backlight display will hurt vision? There are two main reasons. First, the blue spectrum of the LED is obvious, followed by the current PWM brightness adjustment method. We prefer to explain the problem of blue spectrum. According to current medical knowledge, long-wave blue light is the most harmful to human eyes, while the blue light component of LED is very large. Under the same illumination, it is obviously stronger than CCFL backlight, so it is vision The damage is even greater.
PWM is a very complicated thing. It is the meaning of pulse width modulation. It is widely used in the display industry. Common products are modulated by PWM. In this case, the author is not popular. Decomposing PWM can make a lot of space, and it is very boring. In short, in order to maintain the brightness of the screen, the pulse current will cause the screen to flicker. This kind of flicker, when the brightness is high, the speed is fast, the brightness is high. Low speed is slow, and has a lot to do with the material of the backlight. In the past, the CCFL backlight has a fast flashing speed, but the LED backlight is slower than the backlight, because the speed of the flashing is slow, so the user It is easier to get tired of the eyes.
Why LEDs will become mainstream backlights
Now I have a basic understanding of the beginning and end of LED-backlit display. The advantages are very well known, and it is also the reason for its gradual replacement of CCFL backlight. Of course, the performance advantage is only one aspect, and cost control is also very important. Today's LED backlight The industry is very mature and the price and cost are declining, which is also an indispensable factor in its replacement of CCFL.
However, the eye-catching effect mentioned above is a drawback that many consumers do not know. In a society that pays more and more attention to personal health, this drawback is not negligible, the harm of blue light and PWM-driven LED backlighting. The drawbacks are that LED displays still have a lot of room for improvement.
Nowadays, the slogan of eye protection is also played out, but it is only changed on the PWM, and there is no problem of eye damage that is being solved. Of course, as long as it is a display device, no matter what kind of backlight type, long time watching It can hurt eye health, so proper rest is very important, but many people are forced to sit in front of the monitor for a long time, so it is very important to minimize the damage to the eyes of the monitor.
Summary of the full text:
The advantages of LED backlight can not be erased, but the shortcomings can not be ignored, PWM is not the only backlight drive mode, backlight is not the only choice for the display, today I write these are not to criticize the LED display, mainly to remind everyone to pay attention to the eye Health, and look forward to the emergence of new products with the author.
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