▶ definition of distinction
LCD (Liquid Crystal Display for short) liquid crystal display. LCD's structure is placed in parallel among two pieces of glass substrates of liquid crystal box, set the TFT (thin film transistor) on the lower glass substrate, a color filter on a glass substrate, by changing the voltage signal to control the TFT liquid crystal molecules direction of rotation, so as to control each pixel to achieve polarized light or not display purposes.
 
▶ Backlit principle distinction
In the current market, a liquid crystal display is divided into two categories, one is the use of traditional CCFL (cold cathode fluorescent tube) LCD display, and the other is the use of LED (light emitting diode) backlit LCD display. Many consumers directly to the first class display is called LCD, the second category display called LED. In fact, such a statement is not correct. Therefore, when the distinction between LCD and LED, also can be distinguished from the backlight works.

▶ LED backlighting principle
LED backlight light-emitting diodes as a backlight source. Light-emitting diodes by the doped semiconductor material made of several layers of very thin, with a layer of excess electrons, another is the lack of electrons to form positively charged holes, while working current through the combination of electrons and holes with each other, the excess places light energy form of radiation is released. By using different semiconductor materials can be obtained in different emission characteristics of the light-emitting diode.

▶ CCFL backlight principle
Physical constituting CCFL (cold cathode fluorescent lamp) backlight is sealed inert gas Ne + Ar mixed gas in a glass tube, which contains trace amounts of mercury vapor (several mg), and the phosphor coating on the inner wall of the glass. Works produced after secondary electron emission when a high voltage is applied after the tube ends, the inner tube few electronic speed bump electrodes to start discharge, mercury or inert gas in the tube that after electron impact excitation of the ultraviolet radiation of 253.7nm light, UV excitation resulting coated on the inner wall of the phosphor to produce visible light.

Currently there are still a large part of the display using the traditional CCFL backlight, but the current price advantage compared to LED backlit display has been getting smaller and smaller, 18 inches or less price LED backlit display with CCFL monitors have almost the same. Is expected later this year, the price of 23 inches will be flat with the corresponding size CCFL backlit display.