Currently, most notebooks are equipped with a TFT-LCD screen. TFT-LCD LCD screens mainly use two backlight module designs: one is the more common CCFL (cold cathode lamp) backlight module, and the other is the less common LED (light-emitting diode) backlight module. The former can be simply understood as the installation of several long fluorescent tubes on the back of the screen, while the latter can be simply understood as the arrangement of many rectangular LEDs behind the screen.
Today, let us study the business slogan of the LED backlit screen to see if there is any misleading content.
â— LED backlight screen has wider color gamut and more vivid colors?
This is the most commonly used statement by notebook businesses. The sentence itself is not wrong, but the term "LED backlight" refers to the red, green and blue tri-color LED backlight, rather than the white LED backlight used in notebook computers.
LED backlight screen has wider color gamut and more vivid colors?
LEDs (light-emitting diodes) can be classified into three-color LEDs and white LEDs according to the color of the light source.
Three-color LED, also known as "RGB LED", has the advantages of high color saturation and strong color reproduction, and is mostly used in professional liquid crystal displays. However, it is bulkier and has a higher calorific value, so it is rejected by laptops.
What is really used on laptops is actually white LEDs. White LEDs have the advantage of being light weight and are very popular among notebook manufacturers. Compared to CCFLs, white LEDs have fewer drive circuits, and the side light source design makes the notebook screen appear thinner. However, its color gamut and color are much worse than tri-color LEDs.
â— LED backlight screen has a longer life?
According to relevant data, the average life expectancy of CCFL is usually around 20,000-50,000 hours, while the average life of LEDs can reach more than 100,000 hours. Therefore, this statement is not wrong.
LED backlight screens last longer?
However, if you think about it, today, in the fast update of laptops, do we really need 100,000 hours of service life?
According to the calculation of 8 hours per day, the average life expectancy of CCFL should be around 7 years to 17 years. Is this not enough for you?
â— LED backlight screen is more energy efficient?
According to relevant data, the starting voltage of CCFL is as high as 1600V, and the voltage after starting is also 800V; while the starting voltage of white LED is only 24V, the voltage after starting is lower - only 12V. Simply put, fluorescent tubes require higher voltages than light-emitting diodes. On the surface, this statement seems to be correct. However, everyone ignored another factor that determines whether or not to save electricity - current.
LED backlight screen saves power?
Power = voltage × current. Although the voltage of white LEDs is very low, a large number of LEDs increase the current in parallel, eventually resulting in a power that is very close to the CCFL.
PS: According to relevant information, both LED and CCFL emit light at 50-100 lumens/watt.
â— LED backlight screen is more environmentally friendly?
CCFL contains mercury, long-term use will affect human health; LED does not contain mercury, is a green environmentally friendly product, which is good for human health.
Yes, CCFL contains mercury, which is an indisputable fact. However, can the mercury contained in it really threaten human health?
LED backlit screen is more environmentally friendly?
After the implementation of the RoHS standard, liquid crystal display manufacturers have adopted various means to reduce the mercury content of CCFL, and strive to achieve "no pollution to the environment even if it is abandoned in the future."
As for "CCFL contains mercury, long-term use will affect human health" is even more nonsense. If CCFL can threaten human health through a layer of LCD panel, isn't there anyone who is exposed to fluorescent light every day?
LED backlit screen is more environmentally friendly?
After the implementation of the RoHS standard, liquid crystal display manufacturers have adopted various means to reduce the mercury content of CCFL, and strive to achieve "no pollution to the environment even if it is abandoned in the future."
As for "CCFL contains mercury, long-term use will affect human health" is even more nonsense. If CCFL can threaten human health through a layer of LCD panel, isn't there anyone who is exposed to fluorescent light every day?
â—LED backlight screen is thinner?
Generally speaking, the diameter of the CCFL lamp is about 1.8 mm, and the diameter of the LED tube is about 0.6 mm. The innate difference between the two is 1.2 mm. In addition, the CCFL needs to distribute the emitted light evenly across the screen by means of a diffuser, so the thickness of the diffuser is also included. Therefore, the LED backlight screen is thinner than the CCFL backlight screen, which is a matter of course.
â— Summary
The LED backlit screen is indeed better than the CCFL backlit screen, but it definitely does not reach the "far beyond" level.
1. LED is the meaning of LED, "LED backlight screen" is a short name, its full name should be - TFT-LCD screen designed with LED (light-emitting diode) backlight module.
2. LED can be divided into three-color LED and white LED according to the color of the light source. The former has high color saturation, but the weight is relatively large, so it is mostly used for professional liquid crystal display; the latter has general color saturation, but the weight is lighter. What is really used on laptops is actually the latter - white LEDs.
3. The brightness and color saturation of the LED backlight screen are better than the CCFL backlight screen, but it has never reached the level of “far beyondâ€.
4. LED backlight screen life, power consumption and environmental protection are indeed better than CCFL backlight screen, but the gap between the two is not obvious in the actual use process.
5. The LED backlight design can make the notebook screen thinner.
In terms of color gamut, color, life, power consumption, environmental protection and thinness, the LED backlight screen is indeed better than the CCFL backlight screen, but it has never reached the level of “far beyondâ€. Please do not blindly listen to the myth of the business, rational choice of notebook products.
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