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What Is The Difference Between LCD And LED?

Jan 27, 2021

Compared with LCD displays, LED displays have more advantages in brightness, power consumption, viewing angle and refresh rate. The power consumption ratio of LED and LCD is about 1:10, and the higher refresh rate makes LED have better performance in video, can provide a wide viewing angle of 160°, and can display various text, numbers, and color images And animation information, it can also play TV, video, VCD, DVD and other color video signals, and multiple screens can also be broadcast online. The reaction speed of a single element of an organic LED display is 1000 times that of an LCD liquid crystal screen. It can also be illuminated under strong light and can adapt to a low temperature of minus 40 degrees. Using LED technology, a thinner, brighter, and clearer display than LCD can be manufactured, which has a wide range of application prospects.

The difference is that the backlight sources used by the two are different. We know that the liquid crystal itself does not emit light. It needs an auxiliary light source. The LCD uses a cold light tube called CCFL as the backlight, and the LED uses high-brightness white light-emitting diodes as the backlight. The cold light tube of LCD is basically the same as the fluorescent tube in our daily life or the light-emitting principle. The fluorescent tube needs a ballast to generate a high voltage to start emitting light. There is also a high-voltage generating circuit in the LCD, commonly known as a high-voltage board. The high-voltage board can generate a voltage of 1KV or several KV to light up the cold light tube.

In appearance, the LCD tube is very thin, with a diameter of only 2 or 3 mm, and the length is about the same as the width of the LCD panel. LED, or light-emitting diode, is a kind of semiconductor device. It only needs low voltage to light up. It saves electricity. It can be made very small in appearance and can be made into any shape.

In addition, the life of LED is very long, and the lamp tube is not an order of magnitude LCD. Due to its shape limitation, it can only be placed around the screen, and then use the reflector to reflect the light onto the entire screen. The problem of uneven brightness, uneven brightness, then directly affects the reproduction and saturation of colors. Due to the presence of reflectors and other components, the reduction of the thickness of the LCD liquid crystal display is limited and cannot be made very thin.

Unlike this, LEDs are evenly distributed in the form of a square matrix (matrix) as a backlight, so that the uniformity of brightness is solved. Because the reflector is completely abandoned, the LED liquid crystal display can be made very thin and thin, and the volume and weight are greatly reduced. The power consumption of lighting the tube is much higher than that of LED light-emitting diodes. Therefore, the LED liquid crystal display is very power-saving and has data display. The power consumption of the 19-inch LED liquid crystal display is only about 20w.

The LED liquid crystal display is only an improvement in the backlight, not a real LED display. At present, the real display that directly uses LED as the display panel (OLED) has been born. Probably, we can use it in the near future!

--By Weiwo