"Be LED" era! CCFL backlight LCD TV will be eliminated?

2009 is called "the first year of LED TV is not" there is no reason, from 09 years in January the United States CES2009 consumer electronics show in Las Vegas, after LED TV unveiled, foreign and domestic manufacturers have launched their own LED TV, from the original only in high-end type in use, and gradually developed into the at present, widely used in high-end models, throughout the terminal market, LED TV has occupied a large half of the country.

CCFL backlight LCD TV will be eliminated?

Since the introduction of LCD TV so far, CCFL has been the mainstream of the backlight system, why in the LED backlight offensive seems helpless, market share in just over a year on the rapid decline? According to industry sources, LED backlight system not only has a certain advantage in the display performance, but also the rapid increase in the output of LED backlight, the rapid decline in costs, is also an important reason.

Analysis of the concept and characteristics of LED backlight

Liquid crystal display device is a passive light-emitting technology, which determines the need to rely on the backlight system to provide light sources, including liquid crystal display and LCD TVs are so. LCD TV backlight for real commodity has three kinds, namely CCFL (cold cathode fluorescent tube), LED (light emitting diode), HCFL (hcft), in which HCFL technology is not mature, the market only SONY launched a product, after delisting will have no products available.

Schematic of CCFL backlight

CCFL backlight is a simple understanding of the narrow version of the fluorescent lamp, due to congenital deficiencies, the existence of small color gamut, low light utilization, high power consumption, short life shortcomings. But CCFL is not Nothing is right., the price is the biggest reason for its existence, LCD TV in recent years to get a description of its product is not popular, at least the Nothing is right., many consumers recognized.

Schematic of LED backlight

The so-called LED TV, is now referred to as LED backlight LCD TV, compared with the previous LCD TV, only the LED backlight source instead of the CCFL backlight. Remember that just launched "LED backlight LCD TV", many netizens also said love contests this is the manufacturer to play word games, real LED television should be using LED panel TV, is also used in the stadium in the large LED display screen. I do not intend to distinguish among them but which is right and which is wrong outdoor LED display, to make small size into the home is an indisputable fact, the author discussed in this paper.

Direct LED backlight

By CCFL switch to LED, from the promotion of various vendors point of view, the most important advantage is to improve the quality and significantly reduce the thickness of the fuselage appearance. Quality improvement is mainly reflected in the color saturation, LED backlight can obtain wider color gamut, more than one direct type RGB-LED backlight source can reach NTSC standard 80% color gamut, it has also been a lot of friends known as the development direction of comparable LCD TV plasma tv.

Schematic diagram of color gamut of LED backlight and CCFL backlight

CCFL and LED two kinds of light source system is the biggest difference, that is, CCFL is the line light source, and LED is a point light source. The fluorescent lamp used by CCFL is vertical or horizontal arranged in the back of the LCD panel, while the LED backlight is arranged in the rear or around the point LED light source.

LED backlight source (Dian Guangyuan)

According to the different arrangement of LED backlight, LED LCD TV can be divided into the side of the LED (LED point light source is distributed around the LCD panel), straight down LED (LED point light source is distributed in the rear of the LCD panel). According to the different color of the LED backlight, can be divided into white LED and tricolor LED (ie RGB-LED).

LED backlight classification

Compared with the direct type LED backlight, LED backlight side needs to use the light guide light conduction to the liquid crystal panel rear, so easy to cause the edge of the screen brightness between the light leak and uneven picture. But the side of the LED backlight source also has its own advantages, that is, you can do ultra-thin body, Samsung C9000 series is only 7.9MM of the thickness of the body because of the use of side LED backlight.

Samsung C9000 body thickness of only 7.9MM, showing the ultimate Slim Beauty

Relative to the RGB-LED backlight, white LED backlight has a lower cost advantage, technical requirements are lower, but the screen color is far less than the RGB-LED backlight. For example, SONY generation LCD TV 9.9mm ultra wave ZX1 series uses a white LED backlight, and during the X4500 series is the use of RGB-LED backlight.

The bank has a very wide spread and a sense of a statement, that is whether the CCFL backlight LED backlight, body slim and color is a pair of irreconcilable contradictions, to color only at the expense of the thickness of the body, to the body slim only at the expense of quality color. From the current market, the machine, the theory is generally correct, because the ultra-thin LED TV generally uses white light side LED backlight, so the picture quality effect will be lost.

LED backlight LCD TV

I do not intend to select specific LED TV and CCFL TV backlight model models compared in this paper, but in the LED backlight and CCFL backlight are two representative types of comments, so users have let you see only a small part, a clear understanding of the LED and CCFL TV quality. In the LED backlight LCD TV, the author will choose the model is the Samsung C9000 series and Toshiba SV650C series.