4hw.com.cn: when buying TV, you must be wondering whether to buy LCD TV or LED TV. In fact, it's hard to see the big difference in appearance. What are the differences between LED TV and LCD TV, and what are their advantages?
Advantages and differences between LED TV and LCD TV
The difference between LED TV and LCD TV
In principle, LCD devices are like those advertising light boxes in the street. The light source behind them diffuses to a certain extent and irradiates uniformly on the transparent film with pictures, so as to transmit bright pictures. The LCD is like that film, but the picture will change.
CCFLs (cold cathode fluorescent lamps) is used as the light source in traditional LCD devices. Although its name is very professional, we understand it as the fluorescent lamp used at home, but the tube is very thin. Many objects have weird colors under fluorescent lamps, because the light they emit is not sunlight in the real sense. The sunlight we have been used to is made up of red orange, yellow green, blue blue and purple and other colors according to a certain proportion. But the light of fluorescent lamp emphasizes excessively on some colors, while some colors are badly lacking.
So the problem arises, the color of the light source behind the light box is not accurate enough, and the image generated through the liquid crystal panel naturally can not overcome the inherent deficiencies, resulting in color restoration deviation. This is also one of the reasons why LCD is hard to satisfy professional users in image display.
Qualia005 extends the color gamut range of LCD TV to 105% of NTSC standard, basically reproducing all the natural scenes we observed. Its core is to replace the LED backlight system of CCFL.
Advantages of LED backlight technology:
Real time color management. Because red, green and blue are independent, it is easy to control the current display color characteristics accurately;
Reduce the artificial trace of dynamic scene without sacrificing brightness and life. Because the flickering frequency of traditional CCFL lamp is low, the dynamic scene may produce picture jumping. LED backlight can flexibly adjust the luminous frequency, and the frequency is much higher than CCFL, so it can perfectly present the moving picture.
Advantages of LCD TV:
At the beginning of LCD, flat glass panel is used, and the display effect of flat right angle is much better than that of traditional display. However, in terms of resolution, the LCD can provide a higher resolution theoretically, but the actual display effect is much worse (there is a problem of optimal resolution). Although the LCD TV can overcome the jitter and flicker of the scanning line, because the gap of the LCD itself is relatively thick, it will cause the viewing effect of the image like a grid. So the best resolution of LCD screen is 1024x768 (enough). The traditional display can achieve perfect display effect with the support of better display card.