Analysis Of Ten Advantages Of LED Backlight Technology

In terms of the cost of LED backlights and traditional CCFL backlights, as LED backlight technology has become the mainstream today, it has been recognized by consumers for its advantages such as mercury-free, low energy consumption, good color, and long life. At the same time, the cost of small-sized LED backlights has gradually dropped to a price very close to that of CCFL backlights. For consumers, having an energy-saving, environmentally friendly and affordable product will naturally be sought after by consumers.

With its unique and overwhelming advantages, LED backlight technology has gradually shown strong application prospects. So, let’s take a closer look at how LED backlight technology compares with CCFL backlight technology. What are the advantages of LED backlight technology? Why is it so popular in the display market?

LED backlight technology: Ten leading advantages

LED as the backlight source of LCD, compared with traditional backlight technology, in addition to the advantages in the color gamut, there are many unique advantages, which can be summarized into ten aspects:

1) The LED backlight has a better color gamut. Its color expression is stronger than that of CCFL backlight, which can make up for the lack of liquid crystal technology in the number of display colors, and the color reproduction effect is better.

2) The service life of the LED can be as long as 100,000 hours. Even if it is used continuously for 10 hours a day, it can be used continuously for 27 years, which greatly extends the service life of LCD TVs and can obtain an overwhelming advantage over plasma technology.

3) The brightness adjustment range is large. It is easy to achieve LED power control, unlike the minimum brightness of CCFL there is a threshold. Therefore, it is easy for users to adjust the brightness of the display device to the most eye-catching state, whether in a bright outdoor or a completely dark indoor.

4) Perfect moving images. Traditional CCFL lamps have a low flicker and light emission frequency, which may cause screen jumps when performing dynamic scenes. The LED backlight can flexibly adjust the luminous frequency, and the frequency is much higher than that of the CCFL, so it can perfectly present the motion picture.

5) Real-time color management. Since the red, green and blue are illuminated independently, it is easy to accurately control the current display color characteristics.

6) Adjustable backlight white balance while ensuring overall contrast. When the user's video source is switched between the computer and the DVD player, the white balance can be easily adjusted between 9600K and 6500K without sacrificing brightness and contrast.

7) It can provide continuous area array light source for large screen. LED is a flat light source. The most basic light-emitting unit is a square package with a side length of 3~5mm, which can be easily combined to form a surface light source with a predetermined area. It has good brightness uniformity. If it is used as a backlight for LCD TVs Source, the required auxiliary optical components can be made very simple, and the screen brightness uniformity is even better.

8) Security. The LED uses a low voltage power supply of 5~24V, which is very safe, and the design of the power supply module is also quite simple.

9) Environmental protection. The LED light source does not produce any rays or toxic substances such as mercury. It can be described as a green and environmentally friendly light source.

10) Anti-seismic. The planar structure allows the LED to have a stable internal structure and excellent seismic performance.

One of the advantages of LED backlight technology: energy saving and environmental protection

LED backlight is the abbreviation of LightEmittingDiode (light-emitting diode), a light-emitting device that can directly convert electrical energy into light energy.

As a new generation of LCD backlight panel, it has the outstanding characteristics of low power consumption, high brightness and long life.

As the backlight source of LCD, CCLF (cold cathode lamp) is the main element that cannot be lacked is mercury. This is the familiar mercury, and this element is undoubtedly a substance harmful to the human body.

Compared with traditional CCFL backlights, LED backlights can save energy by more than 40% compared with general CCFL backlights of the same specifications and civil grade products, which greatly improves energy saving. In addition, the mercury in the CCFL backlight is a substance that is quite harmful to the environment, but the LED backlight does not contain this harmful substance, which is more conducive to environmental protection.

The second advantage of LED backlight technology: thin and elegant

The LED backlight is composed of many grid-shaped semiconductors, and each "grid" has an LED semiconductor, so that the planarization of the light source can be successfully realized. The planarized light source not only has excellent brightness uniformity, but also does not require complicated optical path design. In this way, the thickness of the LCD can be made lighter and thinner, while still having higher reliability and stability.

The traditional CCFL is a tubular light source, and it requires quite complicated auxiliary components to evenly distribute the light emitted by it to every area of the panel. The thickness of the screen is also difficult to control, and with the increase of the panel, multiple light sources must be used, which further aggravates the complexity and cost of the design, and large-screen LCD TVs are more sensitive to this. For example, for LCD or TV products over 50 inches, the cost of direct-lit CCFL backlight modules may account for more than half of the cost of the panel.

The second advantage of LED backlight technology: ultra-wide color gamut

The LED backlight has the characteristics of more uniform light emission, and is far better than the CCFL backlight in terms of color expression. It can make up for the lack of display colors in LCD technology, and easily achieve a wide color gamut of NTSC118% or higher, allowing the LCD display to truly restore the vivid colors in the colorful nature.

Traditional CCFL backlight technology, due to the limitation of fluorescent material, the red light rendering ability of the lamp tube is weak, and the color mixing effect of the matched color filter is also poor. It can only achieve NTSC 65-75% of the NTSC color area, even if it is By using an improved CCFL light source, it can only achieve a color gamut of about 90% of the NTSC equivalent ratio, which affects the image quality.

The fourth advantage of LED backlight technology: super long life

The service life of the LED backlight can be as long as 100,000 hours, even if it is used continuously for 10 hours a day, it can be used continuously for 27 years. Therefore, the use of LED backlight LCD or LCD TV after a long time of use, the brightness attenuation of the backlight is better than the CCFL backlight.

The lifespan of ordinary CCFL backlights is about 25,000 hours, and the luminous life of the latest top-level CCFL backlights is only 60,000 hours. At the end of the lifespan, the brightness of the LCD will decrease significantly, and the CCFL backlight module of the LCD has to be replaced. The LED backlight does not have such a problem at all. At this stage, the actual service life of the white LED backlight is 50,000 to 100,000 hours, which is basically the same as the service life of the LCD display, and there is the potential for further improvement. Even if it is used 24 hours a day, it is enough for 5 years. Therefore, the luminous life of LED backlights far exceeds that of CCFL backlights.

The fifth advantage of LED backlight technology: high brightness

The brightness adjustment range of the LED backlight is large, and the luminous frequency can be flexibly adjusted. The frequency is much higher than that of the CCFL backlight, so it can perfectly present the motion picture. The traditional CCFL backlight lamp has a low flicker and luminous frequency, which may cause skipping pictures when performing dynamic scenes.

As a passive display device, the liquid crystal display does not emit light by itself. It relies on a backlight source to pass light through the display panel to display graphic images. Therefore, the backlight technology directly affects the image quality of LCD TVs. Traditional liquid crystal displays usually use cold cathode fluorescent lamps (CCFL) as the light source, and it is CCFL that causes the color of the liquid crystal display to be insufficient and poor in color reproduction.

The sixth advantage of LED backlight technology: adjustable white balance

The LED backlight can adjust the white balance of the backlight while ensuring the overall contrast. When the user's video source is switched between the computer and the DVD player, the white balance can be easily adjusted between 9600K and 6500K without sacrificing brightness and contrast.

A white balance adjustment method based on RGB three-color LED backlight, including when the display is running independently, when the backlight is adjusted to a new brightness level, reading the value of the temperature sensor on the backlight board, if the actual value of the current color sensor Larger than the standard value, reduce the current duty cycle of this lamp a bit. On the contrary, increase the current duty cycle of this lamp a bit. In order to obtain the driving current duty cycle and the standard value of the color sensor, a particle swarm algorithm is used. The advantage lies in that the white balance adjustment at a wide temperature is automatically performed, the response speed is improved, the labor intensity is reduced, and the efficiency is improved.

Seventh advantage of LED backlight technology: ultra-high contrast

Compared with the traditional CCFL fluorescent lamp backlight, the LED backlight can further improve the uniformity of light emission. With LED support for multi-point control, the contrast of the display of the LED backlight can be greatly increased to a height of 1 million:1.

To put it simply, the contrast is the same as the full-on/full-off contrast. It is also the ratio of the brightness of the test display when it receives a full-white signal to the brightness of the full-black signal display. Different from the full-on/full-off contrast, the display will adjust the brightness of the backlight tube to make the display brightness higher when receiving a full white signal, and the brightness of the display receiving a full black signal is lower, and then to a larger Numerical value.

With the pull of the LCD market, the LED backlight industry is showing a boom. With continuous progress in the display technology level, the huge LED market is destined to develop into a huge industry.

After years of development, the LED display industry has gradually become mature, and its application fields have also been continuously expanded. According to statistics in recent years, there are more than 140 companies with an annual output value of hundreds of millions of dollars in the domestic LED industry, which fully proves that the tide of the market occupied by LED displays is taking advantage of the trend. From a market perspective, LED backlight technology does have its advantages.