Analysis of Application of LED Backlight and CCFL Backlight in Large LCD Splicing

     In recent years, the development of large-screen splicing has been very rapid, and product sales have also been steadily increasing. Among them , LCD splicing products using LED backlights have performed particularly well, and sales have soared. However, the sales volume of traditional CCFL display light sources has decreased compared to the previous year. Many, it is clear, the introduction of LED backlight LCD splicing screen , with its high brightness, energy-saving environmental protection performance by the market and users, with the LED backlight technology continues to decline in price, reduce the price of CCFL backlight screen Gaps thereby gaining more market share. What is the difference between the LED backlight and the CCFL backlight? What kind of advantages does the LED backlight have? The CCFL is eclipsed.

     The shortage of traditional CCFL backlight compared to LED backlight

    First, the CCFL generates many unwanted spectra outside of its peak spectrum, causing brightness degradation and affecting the LCD 's color reproduction. In the LCD , light from the light source passes through an LCD panel made up of red, green, and blue pixels . For high-color reproduction, the LCD pixel light can only have a narrow spectrum around the dominant wavelength. For this reason, new types of LCD backlights need to be developed , and LEDs are a good choice.

    Second, the CCFL 's white light is cool and its color rendering is poor. The color produced by the illumination on the object is not as bright as the sunlight. For example, the CCFLs currently used in LCD TVs can only represent about 75% of the colors. Using a three-color LED to mix white light can better simulate sunlight and show a natural color. The color produced on an object is better than CCFL. More vivid and vivid.

    Once again, the CCFL is a tubular light source. To spread the emitted light evenly to each area of ​​the panel requires a rather complicated auxiliary component. In addition , the thickness of the screen is also difficult to control, and as the panel increases, multiple light sources must be used. With the increase in the size of the LCD , the design of the LED backlight module is simpler and the cost is much lower than that of the CCFL .

    In addition, CCFLs have the disadvantages of low luminous efficiency, high discharge voltage, poor discharge characteristics at low temperatures, and long gray-scale times for heating, and CCFLs contain harmful metals that do not meet environmental requirements.

The advantages of LED backlight compared to traditional CCFL backlight:

    One is that the brightness uniformity is good. The LED is a planar light source, and the basic light emitting unit is a square with a length of 3 mm to 5 mm ( after packaging ) , which is extremely easy to combine together to become a surface light source with a predetermined area, and has excellent brightness uniformity. As the backlight of the LCD TV, the auxiliary optical components required for the LED can be made very simple and the screen brightness uniformity is even better.

    Second, it is good color rendering. The LED backlight has a better color gamut, better color expression than the CCFL backlight source, and can play a good compensating role for the LCD technology with insufficient display color, and the color reproduction is good.

    Third, it is long life. LED life of up to 100,000 hours, even if used continuously 10 hours a day, you can spend 27 consecutive years, greatly extending the life of the LCD TV, availability overwhelming superiority of plasma technology.

    Fourth, low pressure drive . The LED uses a low voltage power supply of 5V to 24V , which is very safe. The design of the drive circuit module is also relatively simple.

    Fifth, stability is good. The planar structure allows the LED to have a stable internal structure and excellent anti-vibration performance.

    Sixth, it is green. There is no metal mercury that is harmful to the environment in the LED . It is safer and more environmentally friendly.

    Through the above comparative analysis, I believe we have a clearer understanding of the difference between the two backlight sources. This also shows that the future market demand for LED- backlit LCD splicing will become greater and greater. With the concept of energy-saving and environmental protection, the energy-saving requirements of LCD splicing will also increase, and the use of LED backlights will undoubtedly be LCD. The splicing display effect, power consumption and energy saving have been substantially improved. The well-known liquid crystal splicing factory Dii Emperor Electronic's LED highlight LCD splicing screen series products, has achieved a warm response in the market, up to 1800cd/m2 brightness in outdoor use, the obvious advantages, widely praised by customers!

Deweiya technology specializing in the production of : LCD splicing , LCD video wall , 46 inch 55 inch 60 inch LCD splicing screen , touch one machine , Samsung LCD screen , hotline   Mr. Yang Zhou QQ