The Introduction Of Led Backlight Board

led backlight board principle

　　led backlight board principle is composed of P-type semiconductor and N-type semiconductor wafer, in the intersection of P-type semiconductor and N-type semiconductor will appear a special conductive properties of the thin layer of PN junction. pn junction can produce resistance to the diffusion movement of the majority of carriers in the P-type semiconductor and N-type semiconductor, when the positive voltage is applied to the PN junction, the current flows from the anode to the cathode of the LED, and in the PN junction LED is based on this principle to achieve the conversion of electricity and light. According to the different physical properties of semiconductor materials, LEDs can emit different colors of light from ultraviolet to infrared wavelengths

　　Uses of led backlight board

　　LED display products can be seen everywhere in our daily life, the backlighting of cell phone buttons, colorful billboards, home appliances with different colors of indicators, and so on, many of them use LED as a light source. Such as the use of white LED light-emitting diodes instead of CCFT as the backlight of the notebook monitor, is to reduce the power consumption of the laptop display screen, enhance environmental protection. The advantage of LED backlight board is that the backlight board is thin, lightweight, and does not require a converter.

　　Features of led backlight board

　　The led backlight board can change its molecular arrangement state by electric current, and add different voltage to the liquid crystal to control the amount of light through, so as to display a variety of images. However, the liquid crystal itself does not emit light, so LCDs need backlighting. In the past, the backlight of LCD is almost always CCFL cold cathode fluorescent lamp. Since cold cathode fluorescent lamps are not flat light sources, LCD backlight modules are equipped with diffusers, light guides, reflectors and many other auxiliary devices in order to achieve uniform brightness output of the backlight. Even so, it is still very difficult to obtain uniform luminance output like CRT. Most LCDs display all-white or all-black screen, the difference in brightness between the edge of the screen and the center is very obvious. In addition to the complex structure and poor uniformity of luminance output, the use of CCFL as LCD backlight has a short life span. The majority of CCFL backlight in the use of 2 to 3 years after the brightness decline is very obvious, many LCD in the use of a few years after the screen will become yellow, dark phenomenon, which is the use of CCFL short decay period defects caused by.

　　In recent years, led backlight board technology can be said to be updated very quickly, and now such LED backlight technology has gradually entered the industrialization, the formation of their own system, with a certain scale. The most important thing is to compare with traditional technology, not only has obvious advantages of environmental protection and energy saving, catering to the concept of 21 actually advocated, more up to date with the international trend. At this stage, many domestic fields are using such led backlight products, I believe that in the future, such products will penetrate into more fields, thus bringing more stable operation and operation for everyone.