You must be careful about business promotion trap while you want to buy a computer. Notebook businesses use propaganda language on the LED Backlit Screen are basically that this laptop is equipped with the LED Backlit Screen, color gamut wider and longer life than LCD screen, really more energy-efficient, more environmentally friendly and the price is also slightly higher, but absolutely value for money.

People who understand the LED backlits screen may say the above is nonsense, LED backlit screen and LCD screen is simply the two concepts, how can they together to compare?Yes, LED backlit screen is actually just a short name, and its full name should be: using LED backlight module designed for TFT-LCD liquid crystal screen.TFT-LCD LCD backlight module mainly uses two kinds of design: one is the common CCFL (cold cathode fluorescent lamp) backlight module, and the other is not very common LED (light-emitting diode) backlight module. The former can be simply understood as the screen is set back some elongated fluorescent tubes, while the latter can simply be understood as a rectangle on the screen after the set number of light emitting diodes.

Today, let us together look at LED-backlit screen business promotion messages, to see if there is  misleading the consumer.

● LED backlit screen has a wider color gamut, the color is more vibrant?

This is the most common kind of notebook vendors say. This statement itself is not wrong, but the words inside said “LED backlight” refers to is red, green and blue tri-color LED backlight instead of the usual white LED laptop backlight.

LED in accordance with the color of light sources can be divided into three-color LED and white LED. Three-color LED is also called “RGB LED”, with a high degree of color saturation, color reproduction, etc., used for professional LCD monitors. However, its relatively bulky size, heat is also relatively large, it has been shut out laptops.

Truly widely used in notebook computers, it really is white LED. White LED has advantages of light weight, highly popular with notebook manufacturers. Compared with CCFL, white LED less in driver circuits, through the side-light design allows notebook screen to look thinner. However, it is the color gamut and color to be worse than 3-color LED.

● LED backlit screen live longer?
According to the relevant information, the average life expectancy of CCFL is usually in the 20000 -5 million hours, while the LED is the average life expectancy up to 10 thousand hours. Therefore, this argument is also not wrong.
However, have you thought that at such a fast replacement laptop today, we really need the service life of 100,000 hours ?

In accordance with the boot for 8 hours a day, the average life expectancy of CCFL should be 7 years -17 years or so, is this not enough do you use?

● LED-backlit display is saving more power?
According to the relevant information, CCFL startup voltages up to 1600V, the voltage is also post-800V after start; while the white LED-start voltage of only 24V, the voltage starts even lower – only 12V. Fluorescent tubes require higher than the light-emitting diode voltage. On the surface, this argument seems to be correct. However, we ignore the another decision element of power – current.

Power = voltage × current. Although the white LED voltage is low, but increased in parallel a large number of LED current, eventually leading to its power and the CCFL is very close.

PS: According to the relevant information, LED and CCFL light-emitting are 50-100 lumens / watt.

● LED backlit screen is more environmentally friendly?

CCFL contains mercury, long-term use may affect human health; LED contains no mercury, is the green environmental protection products, on human health is good.
Yes, CCFL contains mercury, which is an indisputable fact. However, it contains mercury and really be able to do a threat to human health? After the implementation of the RoHS standard, liquid crystal display maker has taken various measures to reduce the amount of mercury CCFL, and strive to achieve “even if the waste does not pollute the environment.”

As for the “CCFL mercury, long-term use may affect human health” is nonsense. If separated by a layer of LCD CCFL can be a threat to human health, then people who are under the fluorescent radiation would become even more have no health at all?

● LED backlit screen thinner?
Generally, CCFL lamp is about 1.8mm in diameter, LED lamp 0.6mm in diameter, about the gap between the two a priori there is 1.2mm. In addition, CCFL need astigmatism plate will be issued with uniform distribution of light to the whole screen, so also the thickness of the plate astigmatism also count. Thus, LED backlit screen thinner than the CCFL backlit screen, that is thing taken for granted.

However, “with LED backlight designs can be made thinner laptop screen,” and the “LED-backlit screen thinner than the CCFL backlit screen” are two different things. Some notebook manufacturers out of product safety considerations, will give up LED backlit screen, the thickness of the edge of the notebook lid reinforcement, such as: Lenovo IdeaPad Y430.

● LED backlit screen and CCFL backlight screen contrast
How much differences between LED backlit screen and CCFL backlit screen in the actual use of the process? We specifically recruited two Fujitsu S Series notebook are equipped with an LED backlit screen, and another with the CCFL backlit screen.

LED Backlit Screen(left) and CCFL (right)

Summary:

1.LED is the meaning of light-emitting diode, “LED backlit screen” is an abbreviated, its full name should be – using LED (light-emitting diode) backlight module designed for TFT-LCD liquid crystal screen.

2.LED in accordance with the color of light sources can be divided into three-color LED and white LED, the former is high color saturation, but the weight of relatively large, so we use professional LCD display; the latter color saturation in general, but the weight of light. Really widely used in notebook computers, and in fact it is the latter – white LED.

3.LED backlit screen brightness, color saturation better than the CCFL backlit screen, but definitely not reached “far beyond” level.

4.LED backlit screen life, power and environmental protection is indeed better than the CCFL backlit screen, but the gap between the actual use of the process is not obvious.

5. Use of LED backlighting notebook screen design can be made thinner. In the color gamut, color, life, power consumption, environmental protection and thin and so on, LED backlit screen is indeed better than the CCFL backlit screen, but definitely not reached “far beyond” level. Please do not blindly listen to merchants, and rational choice of notebook computers.