LCD TV ushered in the great changes in RGB-LED backlight system

The second half of this year issued in foreign major LCD TV giant manufacturers of new products, RGB-LED (three color LED backlight, different from what we usually white LED with content difference, you can click here to learn) with backlight system of low power consumption, pure color, long life, small volume, fast response time and many other advantages has been almost all these new application vendors. Conforming to the development trend of flat panel TV, which is thin, large screen and high quality, the RGB-LED backlight system will be replaced by the traditional CCFL backlight system from LCD tv.

Review of the domestic market, RGB-LED models are the first to meet with you only SONY and Samsung two 70 inch models, high prices can only make consumers more respect to use these products, but not by the actual experience to the RGB-LED backlight system for LCD TV brings a new shrinkage technological change. In view of the new RGB-LED backlight system will gradually become the leading LCD TV market in the next year, the main technology development, only in this text to reveal to you the LED backlight system for the development of LCD TV played an important role.

LED development look back on the blink of an eye: starting from the notebook computer QualiaTV is too advanced concept is coming to an end

"In the development of LED backlight technology at the beginning of the technology and cost advantage is subjected to LCDTV and display manufacturers when weighing the advantages of LED, there are still a lot of uncertainty. This is also the main reason for the conservative forecast of the LED backlight market. DisplaySearch display technology department head SteveJurichich explained.

2004 launch of SONY very high-end LED backlight QualiaTV and suffered the lessons of Waterloo make manufacturers more cautious action. After all, this has 450 single RGB-LED Qualia TV too far, too expensive. Since then, the market for white LED backlight module is greatly limited to laptops and portable PC, white LED has a very obvious advantage in these applications. If the energy consumption is low, the working hours of the laptop can be greatly prolonged in the long distance flight.

Since 2005, including the SONY 11 inch Fujitsu-Siemens10.6 inch VAIO, handhELd, and Toshiba LibrettoU100 (the first LED screen laptop, notebook computer screen) LED achieved more than QualiaTV success.

Through nearly two or three years of rapid development, LED backlight technology is currently under the condition of a breakthrough technology can greatly improve the quality of LCD TV imaging. Although this technology still belongs to the starting stage in 2007, but due to the efforts of SONY and Samsung, currently on the market there have been real commercial product RGB-LED TV, and they exhibit strong performance, not only to make any one of the existing LCD TV to surrender, but also brings consumers of longing and yearning a better future.

In TV applications, RGB-LED compared with CCFL backlight, the main advantage of color, especially red for what. This is because the red light emitted by CCFL is weaker than green or blue. Of course, CCFL manufacturers did not sit back, but a positive improvement in the CCFL technology, and has obtained a breakthrough performance.

There LED backlit LCD, and the LCD TV display principle. From the structural point of view, the core component of LCD TV, LCD panel is composed of multilayer components, mainly from the bottom of the backlight, the middle of the liquid crystal layer and the outermost RGB filter film composition. The liquid crystal layer itself does not have any luminescence capability, so the performance of LCD TV shows the color is mainly depends on the LCD panel backlight system finally.

And is called the fourth generation LED light source lighting technology, is after incandescent lamp, fluorescent lamp of the new generation of lighting technology, has the characteristics of low power consumption, pure brightness, long life, small volume, fast response time, so in the LCD TV, can greatly improve the color gamut the range of LCD TV is small, low contrast, short service life, to improve the overall performance of the LCD TV to a new level.

More accurate regional brightness control

With LED backlight, past is a question of how to make the screen brightness uniformity, using brightness control can not only solve the problem of regional uniform brightness, but also can further reduce the power consumption of the backlight. This is because the actual luminance of the image in each specific location is not the same, some areas may brighter, some dark areas, so there is no need to use the brightness of the backlight uniformity in the entire screen, can be used according to the brightness of the image content determines the control area. The method is: the entire screen is divided into 20 parts for example, the highest brightness is measured according to the image content, it must the backlight brightness area required, then the real-time control of the backlight brightness of LED using PWM technology, so as to achieve the purpose of energy saving. After the backlight brightness control, the image signal of the region should be compensated accordingly, so as to avoid the brightness distortion.

Obviously, it is not possible to achieve the CCFL backlight brightness control area, one of the reasons is because the CCFL is in the shape of strip, cannot press the screen into 20 equal areas; on the other hand it is because its brightness can not be quickly adjusted according to image content. However, the use of LED as a regional brightness control, can only use direct backlight, and can not be used side jet.

Low cost of manufacturing is the key to the popularity of RGB-LED