What are the advantages and highlights of LED backlight technology
LED backlight technology is indispensable for LED industry to achieve its current outstanding achievements. LED backlight technology quickly opened the market and was recognized by most consumers by virtue of its advantages of mercury free, low energy consumption, good color, long life and so on. Then, let's briefly summarize the advantages of LED backlight technology compared with CCFL backlight technology.
LED backlight technology: ten leading advantages
As the backlight of LCD, compared with traditional backlight technology, LED has many unique advantages in addition to its advantages in color gamut range, which can be summarized into ten aspects:
1) LED backlight has better color gamut
Its color expression is stronger than that of CCFL backlight, which can make up for the LCD technology with insufficient display color, and the color restoration effect is better.
2) LED service life can reach 100000 hours
Even if it is used continuously for 10 hours every day, it can be used continuously for 27 years, greatly extending the service life of LCD TV, and gaining the overwhelming advantage over plasma technology.
3) Wide brightness adjustment range
It is easy to realize 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 pleasing state, whether in bright outdoor or all-black indoor.
4) Perfect moving image
The flickering frequency of the traditional CCFL lamp tube is relatively low, and the performance of dynamic scenes may cause picture jumping. LED backlight can flexibly adjust the luminous frequency, and the frequency is much higher than CCFL, so it can perfectly present the moving picture.
5) Real-time color management
Because the three colors of red, green and blue emit light independently, it is easy to accurately control the current display color characteristics.
6) Adjustable backlight white balance, while ensuring the overall contrast
When the user's video source is switched between the computer and 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 planar light source. The most basic light emitting unit is a square package with a side length of 3~5mm, which can easily be combined to form a surface light source of a given area, with good brightness uniformity. If it is used as the backlight of LCD TV, the required auxiliary optical components can be made very simple, and the screen brightness uniformity is better.
8) Security
LED uses 5~24V low-voltage power supply, which is very safe. The design of power supply module is also quite simple.
9) Environmental protection
The LED light source does not produce any rays, nor does it contain toxic substances such as mercury. It is a green light source.
10) Seismic resistance
The planar structure allows LED to have a stable internal structure and excellent seismic performance.
Do you know the highlights of LED backlight technology
One of the advantages of LED backlight technology: energy saving and environmental protection
LED backlight is the abbreviation of Light Emitting Diode, which can directly convert electric 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 LCD backlight, the main element that CCLF (cold cathode lamp) cannot lack is mercury. This is also known as mercury, and this element is undoubtedly harmful to human body.
Compared with the traditional CCFL backlight, the LED backlight can save more than 40% energy compared with the common CCFL backlight of the same specification, which has a significant improvement in energy saving. In addition, mercury in CCFL backlight is a kind of substance that is quite harmful to the environment, but LED backlight does not contain this harmful substance, which is more conducive to environmental protection.
The second advantage of LED backlight technology: lightweight and elegant
LED backlight source is composed of many grid semiconductors. Each "grid" has an LED semiconductor, which can successfully realize the planarization of the light source. Its planarized light source not only has excellent brightness uniformity, but also does not need complex light path design. In this way, the thickness of LCD can be made thinner, and it can also have higher reliability and stability.
Traditional CCFL is a tubular light source, and it requires quite complex auxiliary components to evenly distribute the light emitted by it to each area of the panel. The thickness of its 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. Large-screen LCD TV is more sensitive to this. For example, for LCD or TV products with more than 50 inches, the cost of the direct-down CCFL backlight module may account for more than half of the panel cost.
The third advantage of LED backlight technology: ultra-wide color gamut
LED backlight source has the characteristics of more uniform light emission, which is far better than CCFL backlight in color expression. It can play a good role in making up for the insufficient number of display colors in LCD technology, and easily realize the wide color gamut of NTSC 118% or even higher, so that the LCD can truly restore the bright colors in the colorful nature.
The traditional CCFL backlight technology, due to the limitation of the fluorescent material, has a weak ability to present the red light of the lamp tube, and the color mixing effect of the matched color filter is also poor. It can only achieve NTSC 65-75% of the NTSC color region. Even through the use of the improved CCFL light source, it can only achieve the color gamut range of about 90% of NTSC, which affects the image quality.
The fourth advantage of LED backlight technology: ultra-long life
The service life of LED backlight source can reach 100000 hours, even if it is used continuously for 10 hours every day, it can also be used continuously for 27 years. Therefore, after using LED backlight source for LCD display or LCD TV for a long time, the brightness attenuation of backlight source is better than that of CCFL backlight.
The service life of the common CCFL backlight source is about 25000 hours, and the luminous life of the latest top CCFL backlight is only 60000 hours. At the end of the service life, the brightness of the LCD will significantly decline, and the CCFL backlight module of the LCD has to be replaced. The LED backlight has no such problem at all. At present, the actual service life of the white LED backlight is 50000 to 100000 hours, which is basically consistent with the service life of the LCD display, and has the potential to be improved again. Even if it is used continuously for 24 hours, it is enough for 5 years. Therefore, the luminous life of LED backlight source is far longer than that of CCFL backlight source.
The fifth advantage of LED backlight technology: achieving high brightness
LED backlight source has a wide range of brightness adjustment, and can flexibly adjust the luminous frequency, which is much higher than CCFL backlight source, so it can perfectly present the moving picture. However, the flickering frequency of the traditional CCFL backlight lamp tube is low, which may cause jumping pictures when performing dynamic scenes.
As a passive display device, the LCD does not emit light by itself. It relies on the backlight to pass the light through the display panel to display the graphic image. Therefore, the technology of backlight source directly affects the picture quality of LCD TV. Cold cathode fluorescent lamp is usually used in traditional LCD
The sixth advantage of LED backlight technology: adjustable white balance
LED backlight can adjust the white balance of backlight while ensuring the overall contrast. When the user's video source is switched between the computer and 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 tri-color LED backlight includes reading the value of the temperature sensor on the backlight panel when the backlight is adjusted to a new brightness level when the display is running independently. If the actual value of the current color sensor is larger than the standard value, the current duty cycle of the lamp will be reduced by a little. On the contrary, the current duty cycle of the lamp will be increased a little. In order to obtain the standard values of driving current duty cycle and color sensor, particle swarm optimization algorithm is used. Its advantage is that it can automatically adjust the white balance at a wide temperature, improve the response speed, reduce human labor intensity and improve efficiency率。
The seventh advantage of LED backlight technology: ultra-high contrast
Compared with the traditional CCFL fluorescent lamp backlight, the LED backlight can further improve the brightness uniformity. With the LED supporting multi-point control, the contrast of the display of the LED backlight source can be significantly increased to a height of 1 million: 1.
In short, the contrast is the same as the full-on/full-off contrast. It is also the ratio of the brightness displayed when the test display receives the full-white signal to the brightness of the full-black signal display. Unlike the full-on/full-off contrast, the display will adjust the brightness of the backlight tube to make the brightness displayed when receiving the all-white signal higher, and the brightness of the display when receiving the all-black signal lower, so as to reach a higher value.
With the pull of the LCD market, the LED backlight industry has shown a prosperous scene. With the continuous progress in the level of display technology, the huge LED market is bound to develop it into a huge industry.
After years of development, the LED display screen industry has gradually become mature, and its application field has also been constantly expanded. According to the statistics in recent years, there are more than 140 enterprises with annual output value of more than 100 million in the domestic LED industry, which fully proves that the market share of LED display screens is rising. From the perspective of the market, LED backlight technology does have its advantages.