LCD TV Future Trend LED will replace CCFL

April 27, 2019

Since 2008, LED backlights have gradually entered industrialization and their market share has expanded. From the beginning to the application of notebook computers, to the present application for display, LCD TV, LED backlight products continue to emerge, the market share continues to increase.
Compared with CCFL backlight, LED backlight has many advantages, especially in environmental protection. Therefore, with the reduction of cost and market expansion, the development of LED backlight industry has a great impact on CCFL backlight. CCFL has May eventually be replaced by LEDs and exit the market.

In an interview with China Electronics News, 3M (China) Optics Department's large-screen business development manager, blocking light, said that the maturity and popularity of LED technology will become a new driving force for the growth of the LCD industry. From the consumer level, it will create new selling points and applications of liquid crystal display, thereby stimulating consumer demand; from the producer level, it will promote technology upgrade and industrial conversion with LED, and continue to attract talents and capital investment.

Compared with cold cathode lamps, LEDs have many advantages. The first is energy saving. The photoelectric efficiency of cold cathode lamps is around 60 lm/W, and the current commercial LED efficiency has reached twice this value, and the samples in the laboratory can be doubled. Second, LEDs will bring about dramatic changes in the design of backlight mechanical structures. Because the LED is small in size and good in directivity, the thickness of the light guide plate in the conventional backlight can be greatly reduced, and even the light guide plate can be omitted.

In addition, mercury in cold cathode lamps is a substance that is costly and hazardous to the environment. From an environmental point of view, the gradual replacement of cold cathode lamps by LEDs will also be an inevitable result.

The application of LEDs can cause subversive changes in the backlight. "3M started to use the company's core technology platform five years ago to develop optical and mechanical systems that can fully utilize the characteristics of LEDs. The changes brought by LEDs to liquid crystal displays have just begun, and we will wait and see what will happen." Lei said.

LED backlights are still insufficient

Although the advantages of LED backlighting are obvious, there is still room for improvement. LED manufacturing and packaging technologies, especially large-size backlights, are not mature enough with CCFLs, and the technical requirements of LED manufacturers for LEDs for backlights are not yet clear. From the packaging point of view, LED packaging is now more suitable for lighting, but not suitable for the backlighting requirements of the light mixing distance. "Commercial LEDs still have problems with low luminous efficiency, and the contradiction between color gamut and light efficiency must be broken, and the price of LED is still high.

The CCFL backlight has always been in the dominant position of the backlight. From medium-sized display products such as notebooks and monitors to large-size products such as LCD TVs, CCFL backlights have always been the largest share of backlights. At present, in terms of large-size backlights, CCFL backlights occupy most of the market because of its low cost and mature technology. At the same time, major manufacturers have added new technologies to CCFL backlights, adding vitality to them, such as scanning backlights and dynamic backlights. The addition of new technologies has improved the quality of liquid crystal displays and reduced power consumption.

Chen Hesheng, general manager of Anhui Wenrun Photoelectric Co., Ltd. also believes that the current mainstream technology and products for large-size backlights are still CCFL. LED applications currently have barriers to promotion in terms of light efficiency, cost, and heat source.

Although the development prospects of LED backlights are promising, the LED light source technology is still not perfect at this stage. Challenges such as cost, light efficiency, and brightness uniformity control still require technical improvements. LEDs are point source properties, unlike CCFLs for line sources. LEDs used in backlights need to be particularly elegant in the processing of light uniformity. In order to emphasize the uniformity of light, the brightness characteristics of each LED are also required to be consistent in selection. In addition, if the life of a certain LED ends first, it will affect the light uniformity, so it is necessary to ensure that all LEDs have longevity function. Such a rigorous selection has led to an increase in the cost of LED backlighting.

However, the good development potential of LED technology has enabled the industry to spare no effort to overcome the above problems. With the continuous improvement of LED light source technology, more and more liquid crystal display products have adopted LED technology.

LED outlook

The latest survey data from the China Electronics Chamber of Commerce Consumer Electronics Survey Office shows that consumers are currently paying attention to LED LCD TV products as high as 75%, ranking first in the rankings. In particular, the "240HZ straight-type LED backlight" technology that LGD has launched in recent days has injected a "strong shot" into the LED LCD TV industry, which has made consumers rush. So, what kind of cutting-edge quality and charm does LED LCD TV have? Can it get such a strong development momentum? According to Zhongyikang’s sample survey of 22 provinces across the country, more than 70% of consumers choose LED LCD. TV is considered to be stylish, light and simple, and more in line with the modern home style. Indeed, the ultra-thin appearance of LED LCD TVs challenges people's limits of “thinness” and fully caters to consumers' demand for personalized products. For example, LG's new direct-lit LED LCD TV is only 24.8mm thinner, and traditional LCD TVs are difficult to achieve such ultra-thin design due to technical difficulties. In addition to the slim appearance, LED-backlit LCD TVs have also achieved a qualitative leap in picture performance. In particular, LGDisplay's flagship star product "straight down" LED LCD TV, can better play the advantages of LED LCD TV. In addition, the LED light source has an arrangement called "side type". Because "straight down" is more perfect for the picture, it is more recognized by the industry. Taking a 55-inch product as an example, the direct-type product evenly distributes more than 3,000 LED lights behind the panel, so that the backlight can be evenly transmitted to the entire screen. At the same time, it also separates the backlight into a number of cells, which can be very perfect black. Another arrangement of LED backlights—the side-side type—installs more than 400 LEDs on the bezel of the panel, which reduces the number of LEDs by nearly 7 times, so it is easy to make the screen brightness “X”. "The form is reduced." Therefore, experts generally believe that direct-lit LED backlights can render images more accurately. Through the introduction of the advantages of LED-backlit LCD TVs, it can be seen that LED LCD TVs will become the first choice for consumers. Finally, experts remind consumers that the most important components of LED LCD TVs are still panels. When you buy, you should not pursue thinness blindly, but ignore the choice of high-quality panels.

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