LED backlight technology lit LCD TV

Citation: August 19, 2004, Sony Corp announced the launch of QUALIA005 in Tokyo, a series of high-definition LCD tv. Each QUALIA product has its attractions, the features of QUALIA005 is significantly more than the ordinary beautiful color LCD tv. In the subsequent Japanese CEATEC exhibition, QUALIA005 for the first time to the public display, attracted a lot of attention. In September of the same year, I have the opportunity to enjoy the QUALIA005 performance picture, let me on the liquid crystal display device potential shocked. The high definition of the film on the film has a color and texture, memorable. Behind the QUALIA005, is the new LED (light emitting diode) backlight technology. As the first LED backlight LCD TV, its color range reached 145% of ordinary products. In May this year, SID2005 (information society in 2005 will be held in the United States of Boston), the other QUALIA005 LED backlight technology has become a hot issue in bright colors. Samsung, LG, PHILPS and other companies have released the latest developments in the field of LED backlight, so that this technology step by step to the real practical. LCD color about embarrassment has entered the office and home LCD display equipment, ordinary users would have been quite satisfied. But professional users of liquid crystal display and LCD TV has always been a "heart", that its color performance is difficult to meet their professional appetite. Indeed, if compared with CRT and other display devices, the mainstream LCD technology does have some shortcomings. In the field of video, people usually use NTSC as a measure of the color reduction characteristics of video equipment standard. This indicator refers to the entire color space, the display device can be displayed in a variety of colors to what saturation, is able to show to what extent the blue, green, red. For LCD TV and traditional display, can cover the color gamut of NTSC standard only 65% ~ 75%. If we look closely at the color gamut curve, we will find that the green, yellow and red parts and the standard distance. Therefore, the traditional LCD TV color range is small, it is difficult to perfect the grass, sea and other natural scenes. From the source of the problem in principle, the liquid crystal display device is like those street advertising light boxes, behind the light source after a certain diffusion, the uniform irradiation on painting the transparent film picture, which shows the bright screen. The LCD panel is like the film, but the picture is changing. The traditional liquid crystal display device uses CCFLS (cold cathode fluorescent lamp, cold cathode fluorescent lamps) as the light source, although the name is very professional, but it can be understood as the home with fluorescent lamps, but the lamp is very fine. The color of many objects in the fluorescent light is very strange, because the light is not the real meaning of the sun. The sun had to adapt to light from the red orange yellow green blue purple and other colored light according to a certain proportion. But the light of a fluorescent lamp is too much emphasis on certain colors, some of which are lacking. So the question arises, the light source color behind the image is not accurate enough, through the liquid crystal panel produced by nature is also unable to overcome the congenitally deficient, color reduction leads to a deviation. This is also one of the reasons LCD display in the field has been difficult to make professional users really satisfied. LED battle QUALIA005 to the color gamut of the LCD TV is extended to NTSC standard 105%, basically all we can reproduce the observed nature scene. Its core is to replace the CCFL LED backlight system.

Figure: LED backlight CCFL backlight and LCD TV in color on the display range of comparison of different materials LED will send different colors of light, different combinations of LED can form the ideal light source, like the sun, in a variety of colors are included enough energy. Because there is no inherent lack of light, LED backlight system can achieve a true image restore, regardless of color or brightness are far more than the previous LCD tv. The delicate color of the skin, the moist green leaves and the vast scenery can produce immersive feeling. Even the traditional CRT display device is difficult to match the color and brightness characteristics of LED backlight LCD tv. Because LED backlight system can show the broad range of colors in the above, we usually watch movies or digital camera can get accurate color reproduction. This means that we can really achieve on the LCD TV wysiwyg". LED backlight technology advantages: high brightness, and can achieve stable brightness and color performance in the range of life. Wider color gamut (more than NTSC and EBU color, achieve more bright colors). White balance backlight can be adjusted, while ensuring the overall contrast. When the user's video source switching between the computer and the DVD, you can easily adjust the white balance between 9600K and 6500K, and does not sacrifice the brightness and contrast. Real-time color management. The red green and blue 3 color independent light, easily control the color characteristics of the current display. Can provide continuous array light source for large size screen. Reduce artifacts in dynamic scenes, without sacrificing brightness and life. Because the traditional CCFL lamp flicker frequency is low, the performance of the dynamic scene may produce picture jitter. LED backlight can be flexible to adjust the frequency of light, and the frequency is much higher than CCFL, so it can be a perfect motion picture. Brightness adjustment range. LED power control is easy to achieve, unlike the CCFL minimum brightness threshold. Therefore, whether in Ming Dynasty