The domestic LED liquid crystal appearance can become mainstream?

With the rapid development of LCD TV in recent years, this year in Beijing held a seminar for developing LCD TV, one of the biggest highlight of the seminar is Xia Xin electronic domestic using LED backlight technology the first LCD TV display prototype, and announced the Xia Xin electron in the field of flat-panel TV strategy Xia Xin, pushing the LCD TV products the LCD TV market this year and will be revival.

China's first LCD backlight technology using LED LCD TV LED backlight technology to bring what changes

We know that the LCD panel is a passive display device, they can not shine, only through the light source to display the image, the vast majority of LCD TVs using cold cathode fluorescent tube (CCFL) as the backlight source. The LED backlight technology is the use of light-emitting diodes as a backlight source to replace the traditional cold cathode fluorescent tube technology.

LED backlight technology principle in order to facilitate the description, the cold cathode fluorescent lamp as the light source of the LCD TV backlight hereinafter referred to as the LCD TV, using LEDs as the backlight source TV TV hereinafter referred to as LED. Here to explain, LED backlight technology is also a kind of LCD TV technology, it is the same principle and LCD TV, but the use of a new backlight source, LED TV still belongs to LCD tv. So LED TV is not a new type of TV, but a new technology with LCD TV, the use of this technology will make the performance of LCD TV has been greatly improved, the following will be mentioned in detail.

LED is English light emitting diode (light emitting diode) abbreviation, its basic structure is an electroluminescentsemiconductor materials, placed on a wire rack, then sealed with epoxy resin around, to protect the internal core role. With the use of semiconductor materials LED TV led by a number of very thin layer made of a layer with an excess of electrons, another layer is the lack of electronic form positively charged holes, through the current work, combination of electrons and holes, the excess energy in the form of light radiation is released, thus forming light source.

Technical defects of cold cathode fluorescent tubes

The development of LCD TV a long time, after continuous improvement, the cold cathode fluorescent tube technology has been very mature, its life in 30 thousand to 50 thousand hours, but the cold cathode fluorescent lamp has many disadvantages:

First, the cold cathode fluorescent tube can reach the color gamut (that is, the color range of the TV), the general cold cathode fluorescent tube can only reach 72% of the NTSC color gamut.

Secondly, the cold cathode fluorescent tube belongs to the tubular light source, in order to make the screen brightness in different regions of uniform, only increase the number of LCD TV cold cathode fluorescent tube, not only need a large number of accessories, increase the difficulty of the design, and the tube too much also increase power consumption.

Three is the LCD panel is controlled by the brightness of light through the panel to the control panel, so the LCD TV in the process of using, the lamp is working, and the cold cathode fluorescent tube using the back light energy efficiency is low, the light transmission from the backlight to the screen, the light energy loss is very serious. Finally about 6% of the light energy can be real use, on the other hand, in order to achieve a higher brightness and contrast, manufacturers must improve the output power of the light source or increase the number of tubes, and the consequences of this is the increase in power consumption.

The four is a cold cathode fluorescent tube to high voltage AC drive, power supply transformer rectifier set of requirements is relatively complex, the service life is not long, many LCD products screen in use after a few years will be yellow, brightness was dim.

Five is a cold cathode fluorescent tube containing mercury, does not meet the requirements of future environmental protection. But these shortcomings are caused by defects of cold cathode fluorescent tube itself, so how to improve the technology, these problems are very difficult to be solved, so people want to develop new technology LED backlight backlight technology.

Technical advantage of LED

Wide color gamut: compared with the common cold cathode fluorescent tube can only reach 72% of the NTSC color gamut of the, the LED TV can achieve the NTSC color gamut. Different materials LED will emit different colors of light, light emitting diode by using different semiconductor materials can obtain different luminescence characteristics of light emitting diode has been put into commercial applications can provide red, green and blue, green, orange, amber, white and other colors. The LCD TV on the use of LED backlight source can be white, generally red, green, blue three primary colors, if the use of more color LED backlight color performance can be further improved.

LED backlight and CCFL backlight color gamut comparison chart color expressive force: the above mentioned is a wide range of color gamut, but this is only the premise of strong color rendering. Due to the LED 3 RGB color light independently, can easily through the color management of color characteristics of the precise control of display. But the LED backlight can be flexibly adjusted light frequency, and the frequency is much higher than that of the cold cathode fluorescent tube, so it can solve the LCD TV show dynamic scene may produce picture beats, perfectly rendered motion picture, reduce artificial traces of dynamic scenes.

LED backlight unit brightness, high contrast, low power consumption, because the brightness of the light emitting diode and the current through the LED, so the screen backlight can be divided into several regions according to the image signal display, light quantity can be controlled separately in each area, so the dark part of the image can be more dark. Bright