Three kinds of LED color TV technology who will dominate the future

At the end of the year before sales season, the domestic flat-panel TV market, LED wind blowing. Samsung, SHARP, SKYWORTH, Haier and other companies are listed on the new, plus the original Hisense, SONY, Tsinghua Tongfang three companies, LED TV has almost become a universal trend. For the future of the color TV industry will play what role LED TV, LED TV technology will have their own evolutionary process, it is bound to be concerned about the issue of flat-panel TV will be a concern for everyone.

Three kinds of LED color TV technology debut

Understand the essence of LED color TV, we must first know that the so-called LED TVs and LED TVs LCD TV is a kind of: a kind of LED backlight LCD tv. Consumers in the store to buy LED TV, LED TV, LED LCD TV, in fact, have to buy the same product. LED is a unique backlight technology for LCD TV products.

LCD LCD TV's biggest feature is that he is not a self luminous products. If you want to LCD TV display screen, it must be equipped with a liquid crystal screen light source. The specific requirements for this "light source" LCD screen are "uniform parallel white light source". The utility model relates to a liquid crystal television which forms a uniform white light source with a parallel surface, and is composed of a light source module, a light source and a light guide plate. Among them, the first three are mainly related to the light, the latter is used to adjust the point of the line or surface, uniform or non-uniform light into a parallel white surface light source.

The biggest difference between the LED TV and the usual LCD TV is that the backlight module is different: the LED TV uses LED semiconductor devices, while the traditional LCD TV uses a cold cathode light source. LED (Light Emitting Diode), light emitting diode, referred to as LED, is a kind of power can be converted into visible light of solid-state semiconductor devices, it can directly convert electricity into light. The heart of LED is a semiconductor chip, one end of which is attached to a support, one end is a negative electrode, and the other end is connected with the positive electrode of the power supply so that the whole chip is encapsulated by epoxy resin. LED light source has the advantages of digital control, low voltage DC drive, rich color combination, long service life, solid form and so on.

LED light source technology used in the field of LCD TV, there are currently three main applications: straight down three primary RGB-LED light source, straight down white LED light source and the side of the white LED light source. The direct and the lateral type are the relation between the direction of LED and the light guide plate. The direction of light transmission of liquid crystal television light guide plate is perpendicular to the liquid crystal screen, and the light guide plate is parallel to the LCD screen. The light input direction of the luminous body is called a side light source on the side surface of the light guide plate. The side LED light source is a nonuniform line light source composed of lattice elements, and the straight down LED light source is an inhomogeneous surface light source composed of lattice elements.

The characteristics of the straight down three color RGB-LED light source is that it is composed of a plurality of RGB primary color light emitting tubes (each primary color can be a certain quantity, usually one or two). The result of all the primary colors of this unit is the white light. And then by a number of such "false white light" units of the entire surface light source matrix. The structure of RGB-LED light source is more complex, the processing technology is also more complex, at the same time, the requirements of the driving circuit and the driving chip are higher. But the highest cost LED LCD TV backlight technology has a broad range of colors, can be very flexible to adjust the light source luminescence properties, and even regional independent adjustment of optical characteristics of each primary point of the function at the same time, the structure of the light source has the highest utilization rate in theory, the highest level of energy saving.

Direct white LED light source and the side of the white LED light source is directly using white LED light, the overall structure is more simple. At the same time, the two color gamut, color display level is also quite. However, the straight down structure can meet the needs of the light source according to the region, but can not be adjusted as the RGB-LED light source. Although the side LED light source does not have the ability to adjust the area, but because the light source is located on the side of the fuselage, it has the characteristics of not occupying the thickness of the body, which is conducive to the development of ultra-thin TV structure. The ultra-thin products on the market are basically the use of side LED light source technology.

At present, in the domestic market, the common LED TV with white light source, straight down structure. Hisense, SHARP, SKYWORTH, and so on are using the same technology. The number of straight down RGB-LED light source products is the least, only SONY and SHARP's very few top models use the technology, and because of the high cost, product market sales opportunities can be ignored. In recent years, with the increase of the single lamp white light source luminous intensity, side type white LED light source products from can only be used in small size display screen (display, notebook computer screen) condition, compared with widely used in ultra thin LCD TV of large size, the domestic market for the Samsung brand representative.

Three kinds of LED technology who is the future

From the point of view of process design, the white LED straight down type structure is the most easy to replace the traditional LCD backlight application, the technical difficulty and the need to modify the minimum product design. Therefore, this LED light source application mode has become the most popular LED