Tag: Solid state lighting device LCD TV
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Friends who have visited the appliance store must have seen more and more LED LCD TVs in the black counters. Some friends will ask, LCD has not been called LCD, what is the LED? Today is here Everyone explains the definition of LED, and what are the advantages of LED LCD TV, I hope that some of the meager help for everyone to buy new features.
In the current LCD TV, 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 lamps) as the 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, and 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.
LED is an advanced LCD solution that replaces traditional LCD backlight modules with LEDs.
Advantages of LED backlight technology:
High brightness and consistent brightness and color performance over the life of the product.
A wider color gamut (over NTSC and EBU color gamut) for more vibrant colors.
The backlight white balance can be adjusted while ensuring 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.
Real-time color management. Since the red, green and blue colors are independent of each other, it is easy to precisely control the current display color characteristics.
A continuous array of light sources can be provided for large screen sizes.
Reduce artifacts in dynamic scenes without sacrificing brightness and longevity. 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 lighting 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 minimum brightness of CCFL. Therefore, it is easy for the user to adjust the brightness of the display device to the most pleasing state, whether in a bright outdoor or a black room.
Wide temperature range, low voltage and impact resistance. Because of the use of solid-state lighting devices, LED backlights have no delicate components and are very adaptable to the environment.
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.
To sum up two points, LED LCD TV has the advantages of power saving, environmental protection and more realistic color, which will definitely become the development direction of LCD TV.
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