Analysis of the end of wide gamut LED backlight technology

Following the gray-scale response time, dynamic contrast, liquid crystal display technology focus in 2008 will be transferred to the color gamut, this point is all the industry consensus. But now the market can buy a wide range of color gamut products are also very few, the price is relatively high, the average consumer is not very understanding of the color gamut.

So-called color gamut, its decision is a display of the richness of color. As we all know, CRT display and LCD are based on RGB imaging, display the colors are colors part of the collection, but there is no way to express all the colors of the visible light, and color gamut value represents the display can show the color range. The larger the color gamut, the more abundant the color of the display screen can be, the more colorful the color is.

For liquid crystal display, the major manufacturers are committed to improving the color gamut of liquid crystal display. At present, the color gamut of the mainstream LCD is about NTSC70%, while the wide color gamut liquid crystal display needs to reach more than NTSC90%. Since the LCD itself is not luminous, but by the light through the backlight to display the image, so the color gamut range is mainly affected by the backlight, wide color gamut LCD market is mainly constituted by the improvement of traditional CCLF fluorescent substances (or add a layer of coating) to achieve high color gamut, make it a light more "white" is more stable, in order to achieve the purpose of improving NTSC color gamut. Because of the difficulty of the implementation of this method, the cost will not increase too much, so it has been the support of many manufacturers. But it must be seen that this method is not the best choice after all, with the help of this technology, the color gamut of liquid crystal display is also difficult to exceed NTSC100%. So what is the solution to this problem? At present, LED is the only answer!

The best answer wide color gamut: LED light-emitting diode

Is the consensus of the industry is the use of LED backlight is the best way to improve the color gamut of the liquid crystal display. The so-called LED (LightEmittingDiode), light emitting diode, a semiconductor device, which is used as luminescent materials using solid semiconductor chip, when the two ends with forward voltage, carrier in semiconductor composite that produces light induced photon emission. LED can be directly issued red, yellow, blue, green, green, orange, purple, white light. This kind of LED backlight technology in notebook computers, LCD TV has already been applied, but there is not much practice on the desktop lcd.

Completely white light

Mentioned in front of the liquid crystal display is not illuminated, but by the light through the backlight to display the image, so the backlight module LCD has a decisive effect on the color gamut. The current mainstream CCFL (cold cathode backlight) due to light limitation, cannot make the liquid crystal display to achieve broad color gamut display range, so the current mainstream color gamut LCD are only about NTSC70%, even with the design to improve the color gamut range has larger, but the effect is not very ideal, and at the same time may reduce the consequences of lamp life.

For CCFL (cold cathode backlight) the shortcomings of LED light emitting diode is sent with high hopes. Compared with the CCLF cold cathode fluorescent lamp, LED light emitting diode has the advantages of wide color gamut, adjustable white point, high light rate and long life, etc., at present, there are two kinds of LED backlight and LED backlight.

In everyone's attention to color, because the LED backlight can after a lightguide dispersed through the mirror reflection after reaching a uniform brightness, in addition, the onboard software can be backlit to color all the control, that is no longer need to compensate for the lamp shortcomings, can achieve a completely white light effect. In addition, the built-in sensor circuit and material help, users can also according to their own needs in the SpectraView in the backlight adjustment, that is to say the color is more rich, able to provide general LCD can not show the color range. At present, the color gamut of LCD with LED backlight can reach more than 110%.

LED led three advantages

Can solve the problem in a wide gamut, relative to the CCFL cold cathode backlight lamp, LED light emitting diode also has more advantages. And the first thing is environmental protection.

CCFLPKLED

In CCLF cold cathode fluorescent lamp as light source of the LCD, one of the main elements of the missing is mercury, mercury is familiar, and this is undoubtedly harmful elements. Although the manufacturers have been trying to reduce the mercury content in the fluorescent tube, but completely mercury free fluorescent tube will bring some new technical problems, temporarily not see the prospects for realization. The anti LED backlight, its advantage is completely free of mercury, in line with the green fashion.

CCFLPKLED

CCFLPKLED

CCFLPKLED

In environmental protection, LED backlight is energy saving, power consumption than the CCFL cold cathode backlight lower. LED internal drive voltage is much lower than CCFL, power consumption and security are better than CCFL (CCFL AC voltage requirements are relatively high