The nature of the liquid crystal itself does not illuminate, which determines the importance of backlight applications. LED is widely recognized as a green and clean light source. LED has long service life, energy saving, good color expression and simple and convenient application. These outstanding advantages make LED backlight an inevitable choice to replace CCFL backlight. The technological development of LED backlights is about the future of this application.
LED backlight technology development trend Currently, the mainstream technologies of backlight include: low-power technology, thin and light technology, color management technology of backlight. LED backlight technology continues to advance toward low-cost, high-quality targets based on various technologies. The technical trend to meet this goal is that LED-backlit TV technology will also be transitioned from the industrialization of edge-light technology to the direct-lit white LED backlight TV and even the RGB direct backlight with consumer demand and market acceptance.
The price of LED lighting unit hinders the popularity of LED backlight modules. At this stage, the price trend of LED lighting units largely dominates the price trend of LED backlights. Taking a large-size side-light white LED backlight as an example, in the backlight cost, the LED light source part accounts for 30% of the entire backlight module, the light guide plate accounts for 13%, and the optical film such as brightness enhancement film accounts for 22%, and the frame accounts for 22%. 25%.
In theory, the price of LED lighting units is not high, but the price of LED products currently on the market is very high. The key issue is that the LED backlight market is not mature enough. At present, because many parameters of LED, such as voltage, brightness, and chromaticity, are extremely strict, resulting in an increase in product cost, the consistency of the performance of the application manufacturer is reduced, or the yield is also reduced. As a result, the cost of LED and LED backlights will increase greatly, eventually delaying the industrial development of LED backlights.
With the completion of several high-generation production lines such as the 6th generation line and the 8.5th generation line in mainland China and the gradual mass production from the fourth quarter of 2010, the global TFT-LCD industry is re-forming a new layout, corresponding to it. LED chip manufacturing and manufacturing is also taking shape.
According to the observation of LED manufacturers, the LED industry also has "Moore's Law" similar to that in the microprocessor industry. It can be foreseen that with the continuous expansion of the LED application market, the increase in production capacity and the improvement of luminous efficiency, the cost of LED backlights will rapidly decline, the cost of LED backlights will be mutually driven by the market, and the cost reduction of LED backlights will directly accelerate. The market penetration of display products such as LED-backlit TVs, and the market penetration of display products such as fast-growing LED-backlit TVs will cause the cost of LED backlights to fall rapidly.
With the decline in the price of large-size side-lit white LED TVs, customers' requirements for LED TV performance and color will become higher and higher. As early as 2006, some people proposed a direct-lit type, but in a single view, they used edge-lit LEDs, which improved their light utilization and reduced the number of LEDs required. This technology of direct and partial side light reduction can reduce the number of LEDs and reduce the cost. Regional control is used to reduce power consumption. It may be possible to temporarily solve the problem of high LED price and low light efficiency to realize the marketization of LED backlight TV or display, but Still can't achieve better results in color.
The direct-lit RGB-LED backlight can greatly improve the color performance of the liquid crystal display. It can realize a wide color gamut range that cannot be achieved by CCFL light sources and white LEDs by LED devices that can emit high-purity red, green, and blue light. At present, the mainstream RGB LED can make the designed LED backlight reach the 105% NTSC color gamut range. If more powerful LED devices are used, more than 130% of the NTSC color gamut can be achieved. In addition to good color gamut expression, RGB-LED backlight can be integrated with complex microprocessor control technology, video digital image processing technology, effectively improve the contrast of liquid crystal display, and achieve more accurate color gradation and more layered picture. Since the entire backlight is composed of a plurality of tiny LED lighting units, precise brightness control can be implemented for each of the light-emitting devices, and the brightness of the light in a small area can be corrected according to the original picture characteristics, for example, in a strong contrast picture. The LED backlight in the dark area can be completely turned off, while the LED backlight in the bright area achieves high brightness output.
In addition, due to the development of LED production technology is also limited by the development of machining technology, CNC technology, and preparation technology. At present, there are two cases in which a batch of LEDs are produced and applied to the same backlight source: one is to strictly control the LED sub-bin, and one batch of LED backlight display products uses a bin LED to make the backlight brightness uniformity meet mass production requirements. The other is to allow a mixed binLED, that is, several bin LEDs are mounted on a backlight, but need to have brightness correction control to achieve uniformity. In the first case, due to the strict requirements for the division of LEDs, it is equivalent to greatly increasing the cost of backlights. Part of the reason for the high price of LED backlights on the market is that this is the result. For the second case, it can be solved with area control technology and image processing technology, and this technology is easier to implement on a direct type backlight.
Although large-size liquid crystal displays still have a considerable market share in the next few years, the development of drive and control chips for large-size direct-lit backlights has only been a few years old. For the characteristics of LED backlights, complex control technology and signal processing technology can be integrated into the backlight technology. The current practice is to use FPGA, each with different algorithms and control methods. With the development of backlight technology and digital TV technology, the backlight control algorithm and the driving method are standardized. In order to reduce the cost, the backlight control unit, the screen display control and the TV core microprocessor are unified by a microprocessor. A technology trend.
While large-size LED backlights are gradually maturing, small and medium-sized LED backlights are at risk of being replaced by OLEDs in the display field. Because from the perspective of energy consumption, the drawbacks of TFT-LCD with color film for low backlight utilization are inconsistent with the theme of green products, but the current small and medium-sized OLED active illumination technology has great market prospects.
LED backlight technology development trend Currently, the mainstream technologies of backlight include: low-power technology, thin and light technology, color management technology of backlight. LED backlight technology continues to advance toward low-cost, high-quality targets based on various technologies. The technical trend to meet this goal is that LED-backlit TV technology will also be transitioned from the industrialization of edge-light technology to the direct-lit white LED backlight TV and even the RGB direct backlight with consumer demand and market acceptance.
The price of LED lighting unit hinders the popularity of LED backlight modules. At this stage, the price trend of LED lighting units largely dominates the price trend of LED backlights. Taking a large-size side-light white LED backlight as an example, in the backlight cost, the LED light source part accounts for 30% of the entire backlight module, the light guide plate accounts for 13%, and the optical film such as brightness enhancement film accounts for 22%, and the frame accounts for 22%. 25%.
In theory, the price of LED lighting units is not high, but the price of LED products currently on the market is very high. The key issue is that the LED backlight market is not mature enough. At present, because many parameters of LED, such as voltage, brightness, and chromaticity, are extremely strict, resulting in an increase in product cost, the consistency of the performance of the application manufacturer is reduced, or the yield is also reduced. As a result, the cost of LED and LED backlights will increase greatly, eventually delaying the industrial development of LED backlights.
With the completion of several high-generation production lines such as the 6th generation line and the 8.5th generation line in mainland China and the gradual mass production from the fourth quarter of 2010, the global TFT-LCD industry is re-forming a new layout, corresponding to it. LED chip manufacturing and manufacturing is also taking shape.
According to the observation of LED manufacturers, the LED industry also has "Moore's Law" similar to that in the microprocessor industry. It can be foreseen that with the continuous expansion of the LED application market, the increase in production capacity and the improvement of luminous efficiency, the cost of LED backlights will rapidly decline, the cost of LED backlights will be mutually driven by the market, and the cost reduction of LED backlights will directly accelerate. The market penetration of display products such as LED-backlit TVs, and the market penetration of display products such as fast-growing LED-backlit TVs will cause the cost of LED backlights to fall rapidly.
With the decline in the price of large-size side-lit white LED TVs, customers' requirements for LED TV performance and color will become higher and higher. As early as 2006, some people proposed a direct-lit type, but in a single view, they used edge-lit LEDs, which improved their light utilization and reduced the number of LEDs required. This technology of direct and partial side light reduction can reduce the number of LEDs and reduce the cost. Regional control is used to reduce power consumption. It may be possible to temporarily solve the problem of high LED price and low light efficiency to realize the marketization of LED backlight TV or display, but Still can't achieve better results in color.
The direct-lit RGB-LED backlight can greatly improve the color performance of the liquid crystal display. It can realize a wide color gamut range that cannot be achieved by CCFL light sources and white LEDs by LED devices that can emit high-purity red, green, and blue light. At present, the mainstream RGB LED can make the designed LED backlight reach the 105% NTSC color gamut range. If more powerful LED devices are used, more than 130% of the NTSC color gamut can be achieved. In addition to good color gamut expression, RGB-LED backlight can be integrated with complex microprocessor control technology, video digital image processing technology, effectively improve the contrast of liquid crystal display, and achieve more accurate color gradation and more layered picture. Since the entire backlight is composed of a plurality of tiny LED lighting units, precise brightness control can be implemented for each of the light-emitting devices, and the brightness of the light in a small area can be corrected according to the original picture characteristics, for example, in a strong contrast picture. The LED backlight in the dark area can be completely turned off, while the LED backlight in the bright area achieves high brightness output.
In addition, due to the development of LED production technology is also limited by the development of machining technology, CNC technology, and preparation technology. At present, there are two cases in which a batch of LEDs are produced and applied to the same backlight source: one is to strictly control the LED sub-bin, and one batch of LED backlight display products uses a bin LED to make the backlight brightness uniformity meet mass production requirements. The other is to allow a mixed binLED, that is, several bin LEDs are mounted on a backlight, but need to have brightness correction control to achieve uniformity. In the first case, due to the strict requirements for the division of LEDs, it is equivalent to greatly increasing the cost of backlights. Part of the reason for the high price of LED backlights on the market is that this is the result. For the second case, it can be solved with area control technology and image processing technology, and this technology is easier to implement on a direct type backlight.
Although large-size liquid crystal displays still have a considerable market share in the next few years, the development of drive and control chips for large-size direct-lit backlights has only been a few years old. For the characteristics of LED backlights, complex control technology and signal processing technology can be integrated into the backlight technology. The current practice is to use FPGA, each with different algorithms and control methods. With the development of backlight technology and digital TV technology, the backlight control algorithm and the driving method are standardized. In order to reduce the cost, the backlight control unit, the screen display control and the TV core microprocessor are unified by a microprocessor. A technology trend.
While large-size LED backlights are gradually maturing, small and medium-sized LED backlights are at risk of being replaced by OLEDs in the display field. Because from the perspective of energy consumption, the drawbacks of TFT-LCD with color film for low backlight utilization are inconsistent with the theme of green products, but the current small and medium-sized OLED active illumination technology has great market prospects.
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