LED LCD TV quietly sprouting

When the plasma (PDP), liquid crystal (LCD) has become the most popular display products for home users, recently in the field of LCD TV and frequently appeared a new term: LED LCD tv. Many flat-panel TV manufacturers began ambitious plans to launch LED LCD tv. Not long ago, Samsung took the lead in the release of the country's largest 70 inch LED LCD TV, and earlier, SONY, PHILPS has announced the launch of the use of LED Technology TV products. It can be predicted that LED technology will become a hot topic in the recent flat-panel TV industry. So what exactly is LED LCD TV? It is the traditional LCD LCD TV and how the difference?

The key difference between LED and traditional LCD: backlight

LED is the English abbreviation of LightEmittingDiode, LED application can be divided into two categories: first, LED single tube applications, including backlight LED, infrared LED, etc., in addition to the LED display.

LCD is the LCD screen. It includes TFT, UFB, TFD, STN and other types of LCD screen.

From the display technology, LCD is composed of liquid crystal display, and LED is led by the display screen. LED digital display in each pixel unit is a light-emitting diode, if it is monochromatic, usually a red light-emitting diode. If it is color, usually a small diode consisting of three primary colors of a large diode. The matrix composed of these diodes is digitally controlled to display characters or images in real time, and the cost is relatively low. General stations, squares and other public places subtitles, open-air TV wall are LED digital.

The LCD LCD pixel unit is integrated in the same LCD panel which separated the small squares. Through the digital control of these tiny squares for imaging, the effect is more delicate. LED advantages: good color, long life, environmental protection backlight applications, color, long life, environmental protection is the advantage of LED. As we all know, liquid crystal display itself does not emit light, it relies on the backlight to light through the display panel to display the graphics. Therefore, backlight technology directly affects the quality of LCD tv.

The traditional liquid crystal display usually uses CCFL backlight, that is, cold cathode fluorescent lamp. CCFL has a lot of very good features, including excellent Bai Guangyuan, low cost, high efficiency, good stability, easy to operate, etc.. It has been widely used in notebook computers, desktop computers and TV sets. Due to low cost, mature technology and other reasons, CCFL will continue to be the main source of LCD backlight in the next few years.

But CCFL is not considered environmentally friendly, mercury; color performance is not enough, can only reach NTSC of 70%~80%; for large size TV screen, CCFL voltage rise and long pipe processing is also difficult.

In contrast, LED uses a light-emitting diode as a backlight source, can provide red, green and blue, green, orange, amber, white and other colors, color gamut wider color gamut can reach 105% NTSC, which provides a guarantee for the promotion of color LCD tv.

In addition, the LED life is very long, the service life of up to 100 thousand hours, if you press a day to start the calculation of 5 hours, a LED backlight LCD TV can be used for nearly 55 years. In addition, it does not contain mercury, better environmental performance.

LED urgent need to face the problem: cost, technology, light transmission efficiency

Although LED has obvious advantages, but really can replace or replace the traditional part of the liquid crystal CCFL luminescence is not an easy thing. There are three main reasons, such as cost, technology maturity and transparency.

From the cost point of view, the current LED and CCFL backlight module there is still a big spread. The second half of 2006, 40 inch LED backlight module price of about $610, CCFL is $210, the gap between the two is about 3 times.

TV competition next battle: LED

TV manufacturers competition, can be described as a very tragic war. It can be predicted that with the development of micro mechanics, microelectronics and materials science and technology, there will be more power consumption and lower cost, higher light, longer life, lighter and lighter and more new LED backlight LCD. This is a boon for consumers, but it may be the next battleground for TV makers.

Source: Beijing Youth Daily