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Backlight principle know LCD and LED

  • Author:Eunice
  • Source:net
  • Release on :2016-04-01
         Shenzhen Risen OPTO Co.,Ltd,LED Flood Light Manufacturers,led wall washer light suppliers,led smd 5730 flood light.
          In the current market, LCD monitors are mainly divided into two categories, one is the use of traditional CCFL (cold cathode fluorescent lamp) LCD, and the other is the use of LED (light-emitting diode) backlight lcd. Many consumers directly to the first type of display called LCD, the second type of display is called LED. In fact, such a statement is not correct. Therefore, in the distinction between LCD and LED, but also can be distinguished from the principle of backlight.
LED backlight principle
          LED backlight using light emitting diode as light source. Light emitting diode made from several layers of thin doped semiconductor material, with a layer of excess electronic, another layer is the lack of electronic and the formation of positively charged holes, when the current through the, combination of electrons and holes, the excess energy is in form of optical radiation is released. The light emitting diode by using different semiconductor materials can obtain different luminescent properties.
          LED light color technology a significant advantage, so in the display manufacturing favored. The outmoded CCFL (cold cathode backlight) due to the limitations of the spectrum, color gamut range is large, about the best performance is only 70% of the NTSC color gamut, higher color effect to pay a high cost.
          But the use of LED as a backlight source is completely different, because the LED (light emitting diode) light covering a range of chromatography is wider, emitting area is more uniform, normal color gamut range can be easily reached 100% ~ 130%, not like traditional CCFL backlight appear 30% loss of color. So the LED backlit display colors more full picture details more clearly, more natural color transition.
CCFL backlight principle
          CCFL (cold cathode fluorescent lamp backlight physical constitution is in a glass tube sealed Sui gas Ne+Ar mixed gas, which contains trace mercury vapor (mg), and in the glass wall is coated with a fluorescent body. The working principle is when high voltage at both ends of the lamp, lamp in a high-speed electrons striking the electrodes to produce secondary electron emission and began discharging and inner tube of mercury or inert gas by electron impact, stimulate radiating 253.7nm UV, UV excited coated in the fluorescent powder on the inner wall of the tube and produce visible light. CCFL lamp life is generally defined as: at 25 DEG C, with rated current driving lamp, the brightness is reduced to the initial brightness of 50% hours lamp life length. At present, the nominal life of LCD TV backlight can be up to 60000 hours. CCFL (cold cathode fluorescent lamp) backlight is characteristic of low cost, but as the performance of color LED backlight.
           There are still a large part of the display using traditional CCFL backlight, but compared to the current LED backlit display price advantage has been getting smaller and smaller, 18 inch led backlit display price has with CCFL displays is almost the same. Is expected in the second half of the year, the price will be 23 inch CCFL backlit display with the corresponding size of the flat.
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