LED application in the television industry

- Jan 24, 2019-

As TV manufacturers continue to introduce new LED TVs, more and more people are turning their attention to this new generation of TVs with lower energy consumption and thinner body. According to the prediction of the authoritative organization, as the market scale expands, the cost of LED TV will further decline. It is expected to surpass the traditional LCD TV in two years and become the mainstream of the market. Although many consumers are interested in LED TVs, they do not understand the difference between them and traditional LCD TVs.

In principle, the liquid crystal display device is somewhat like the advertising light box on the street. The light source behind it diffuses evenly and is evenly irradiated on the transparent film on which the picture is painted, thereby transmitting a beautiful picture. The LCD panel is like that layer of film, but the picture in it will change.

Conventional liquid crystal display devices use CCFLS (Cold Cathode Fluorescent Lamp) as a light source. Although the name is very professional, we understand it as a fluorescent lamp for home use, but the lamp is very thin. Many objects are weird under the fluorescent light because the light it emits is not true daylight. The daylight rays we have adapted to are composed of red, yellow, green, blue, purple and other light rays combined in a certain proportion. However, the light of the fluorescent lamp is over-emphasized in some colors, and some colors are lacking.

Then the problem arises. The color of the light source behind the light box is not accurate enough. The image generated after passing through the liquid crystal panel naturally cannot overcome the inherent deficiency, resulting in color reproduction deviation. This is one of the reasons why liquid crystal displays have been difficult to satisfy professional users in image display.

QUALIA005 extends the color gamut range of LCD TVs to 105% of the NTSC standard, essentially reproducing all of our observed natural scenes. The core is to replace the CCFL LED backlight system.

Advantages of LED backlight technology

A wider color gamut (over NTSC and EBU color gamut) for more brilliant colors; high brightness, and stable brightness and color performance over the lifetime; adjustable backlight white balance while maintaining overall contrast. When the user's video source is switched between the computer and the DVD player, the white balance can be easily adjusted between 9600K and 6500K without sacrificing brightness and contrast; it can provide continuous array light source for large-size screens; real-time color management. Because the red, green and blue colors are independent, it is easy to accurately control the current display color characteristics; reduce the artificial traces of the dynamic scene without sacrificing brightness and life. Because the flashing illuminating frequency of the conventional CCFL lamp is low, the performance of the dynamic scene may cause the picture to jump. The LED backlight can flexibly adjust the light-emitting frequency, and the frequency is much higher than the CCFL, so it can perfectly display the moving picture; the brightness adjustment range is large. It is easy to achieve LED power control, unlike the lowest brightness of CCFL. Therefore, whether in a bright outdoor or all-black room, the user can easily adjust the brightness of the display device to the most pleasing state; low electromagnetic radiation. LED light source does not produce any radiation, and there is no toxic substance such as mercury. It can be said to be a green light source; it has a wide temperature range, low voltage and impact resistance. Because of the use of solid-state lighting devices, LED backlights do not have delicate components, and they are very adaptable to the environment.