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From initial concept to todays universal energy-saving LED TV Technical Analysis

In Electronic Infomation Category: R | on July   10, 2011

With the rapid development of liquid crystal display technology, and MAX693EWE datasheet and now, a variety of cutting-edge display technology in the field of LCD TVs has been widely used. Throughout the past two years, liquid crystal display technology, LED backlight technology, the birth, there is no doubt that LCD TV technology is a major breakthrough. With its energy saving LED, superior quality color, light and MAX693EWE price and other outstanding features, as nearly two years since one of the most popular keywords.

LED display technology as a new, in fact, have long been popular in other fields and MAX693EWE suppliers and applications. Because of their technical use of the high cost of technical difficulty, in the LCD TV has not been widely used in the field and popularity, has long been regarded as the concept of consumer products. To neck bottles which, after several years of research and development and practical application of a breakthrough in 2009 completely, not only to the minimum machine cost control, but also allow consumers to experience the new display technology brings a sense of visual impact.

Products from initial concept to todays popular products, LED TV has won the majority of consumers. LED energy saving in the popularity of television on the occasion, we may work together to meet some of the latest model of the new LED energy-saving technology, so that we can have a more profound understanding of LED TV, the choice to be more specific.

LED basic techniques

LED (Lighy Emitting Diode), also known as light emitting diodes, semiconductor chips are used as light-emitting solid materials, when coupled with a positive voltage across the semiconductor carrier in place complex, causing release of excess energy photon emission produce visible light.

LED light-emitting process includes three parts: the forward bias carrier injection, combined radiation and energy transfer. Tiny semiconductor chip is encapsulated in epoxy material in clean, when the electronic through the chip, the negatively charged electrons with the positively charged holes move to the area and with the compound, both electrons and holes generate photons disappear. Between the electron and hole energy (band gap) increases, resulting in the higher photon energy. Photon energy in turn corresponds with the color of light, visible light spectrum, the blue light, purple light carries energy up, orange light, red light carries energy minimum. Because different materials have different band gap, which can emit different colors of light.

Analogy, LED is like a hamburger, you can light the material is laminated in "meat pie", while the bottom electrode is the bread with meat. Luminescent material through the research on which people gradually developed a variety of light and color, increasing the efficiency of the LED light elements, but no matter how change, LED light-emitting principle and structure of the total did not change much.

LED lighting will be the mainstream of high-brightness white LED. At present, many commercial white LED is a two wavelength, ie blue-chip mixed with YAG yellow phosphor to produce white light. A more promising future, a three-wavelength white light LED, that is inorganic UV chip plus red, blue and green produce white light color phosphor mix, it will replace the fluorescent lamps, compact fluorescent light bulbs and LED backlight and other markets. Characteristics of different types of LED technology

Good as LED light features, better color saturation, fast response time, light leakage effect is weak. By increasing the contrast by means of regional control, performance, much better than the cold cathode fluorescent lamp (CCFL). And the cold cathode fluorescent lamp containing mercury and other harmful substances, LED contrast, more environmentally friendly advantages.

Current LED technology in the field of liquid crystal applications, the main alternative is the use of LED light emitting devices before CCFL fluorescent lamp light source, a backlight liquid crystal display devices, issued in accordance with LED light source colors into white LED backlight and RGB-LED backlight two sources. Issued in the LED light source

colors, white light may be issued to achieve the goal. In the liquid crystal display device imaging principle, the issue of white backlight through the liquid crystal layer, and then through the R / G / B color filter, become independent of the primary colors. In the process, determine the final color liquid crystal display devices of liquid crystal layer is not critical, but the backlight light quality. RGB backlight spectrum in the higher purity of each color of light, in the final to restore the more pure colors, only to restore a pure RGB primary colors in order to deploy a pure and true color effects.

White LEDs can also be used to reduce the thickness of the LCD panel to achieve ultra-thin product. In the liquid crystal display devices, LED backlight panel will follow the shape and size of the LCD panel designed in different shapes and sizes. LED backlight panel is basically a rectangular or a long strip. It has side and bottom of the LED light are two basic structures. The structure of side emitting backlight for long, narrow strip board (usually greater than 2 times the length of the height); the bottom of the light-emitting structure is mainly used for almost the same length and width of the backlight board. LED is lit, the light launched into a transparent plexiglass, so that the entire light emitting surface can be seen, this is called side-optic effect. Granular beads made of plexiglass at the top, make the whole more uniform light emitting surface. The top of a layer of white acrylic clear plastic film, the light emitted can be more gentle. Both sides of the backlight side plate seal tape with silver shading. Each column has two LED light-emitting elements in series diode, LED array, a number of columns (as the backlight plate length).

We mentioned above, LED in addition to white, there is a use can be issued R / G / B three monochromatic light of the LED backlight technology. RGB primary colors can be deployed out of the nature of any one color, is also widely used in LCD TVs.

RGB-LED backlight is of high purity can be issued through the red, green and blue light, LED components, to achieve the traditional CCFL light source can not reach the wide color gamut. The current mainstream RGB-LED backlight has been up to 105% of the NTSC color gamut, and more powerful as long as the use of performance LED devices can be realized now more than 120% NTSC color gamut. This is mainly for the TV to restore the image, the will be a very effective means to improve quality.

RGB-LED backlight color gamut in addition to a more expressive sound, but also can effectively enhance the contrast of the TV, to achieve a more precise level of gradation and a stronger sense of the screen. Since the backlight LED light sources are many small units, so it can be a light-emitting devices each of which precise brightness control. According to the original characteristics of the small area in the screen brightness correction become possible, for example, a strong contrast of light and dark images, the dark area can be completely shut down LED backlight, LED backlight and bright regions of high light output, and the resulting will enhance the effect of the contrast with the past, LCD TV CCFL light source can not be compared. Other advantages of LED technology

In front of the LED technology type through the introduction, I believe we already have on the basic understanding of LED. But as a new type of display technology, understand the technical principles alone is not enough, the use of LED backlight technology, compared to the difference between an ordinary LCD TVs, where advantages may be more concerned about a lot of friends. Here we have the outstanding characteristics of the LED as a starting point, as we introduce a simple LED technology compared to traditional LCD TV now have the advantage.

LED as LCD backlight, compared with traditional backlighting, LED backlight with a higher color gamut, better color reproduction, and its color performance was stronger than CCFL backlight, may be less than the range of color liquid crystal display the role technology plays a very good cover; LED life of up to 10 million hours of continuous use even 10 hours a day, can also be used continuously for 27 years, greatly extending the life of LCD TVs, plasma technology to gain an overwhelming of advantages.

At the same time, LED display technology as a cutting-edge, brightness adjustment range is very large, LED power control is easy to achieve, unlike CCFL brightness of the existence of a minimum threshold, therefore, both in bright outdoor or all black room, users can easily adjust the brightness of the display device to the most pleasing to the eye of the state.

In addition to energy efficiency, color gamut of advantages, LED backlight, there are many unique advantages. Twinkling of traditional CCFL lamp low frequency performance of dynamic scenes may have beat the screen, but the flexibility to adjust the backlight LED light frequency, and the frequency much higher than the CCFL, thus a fine display of motion pictures.

LED backlight color management to real-time, independent of the RGB 3-color light, easy to accurately control color characteristics of the current display, but also can adjust the backlight, white balance, while ensuring the overall contrast, when the users computer and video source switching between the DVD drive, you can easily adjust the white balance between 9600K and 6500K, but without sacrificing brightness and contrast.

LED is a planar light source, the basic unit is 3 ~ 5mm light-emitting side of the square, packaged together very easily become an established area of the surface light source, with good brightness uniformity. As the LCD TV backlight, the auxiliary optical components required can be done very simple, even better uniformity of screen brightness.

LED low power use, very safe, power module design is also quite simple. At the same time, there is no ray production, no toxic substances like mercury, is the green light. In addition, the plane-like structure so that LED has a solid internal structure, seismic performance is also very good. LED TV market trends

LED LCD TV as the current development of a core technology, LED prospects are very good, technology funds have become the scale, and with the popularity of environmental awareness, environmental conservation and social LED has become the darling of the market, many Government departments are caused by its very high importance.

Present, Chinas LED industry has begun to enter the development stage, the upstream side of Shenzhen enterprises are mainly large, blue Shanghai, Jiangxi and other joint creation, production companies are Shenzhen River quantum, Hebei Xin Gu, Hangzhou Chong-yuan, and the downstream production enterprises are mainly Xiamen Hualian, Foshan and optoelectronics. Science and Technology has approved in Shanghai, Dalian, Nanchang, Xiamen, Shenzhen 5 LED industrial base to build, but that most of them are used for semiconductor lighting.

TV makers, some time ago, Hisense announced the establishment of an LED module production line. Since then, Tongfang also said he would focus on fund-raising 2 billion yuan investment in LED. Couple of years, Hisense, Konka, Samsung, Tsinghua Tongfang, LG, Sony, Sharp have launched a LED TV.

TV Samsung China Headquarters Minister Liming Xu, product marketing, said in an interview, LED CCFL backlight technology is relatively speaking, a high brightness, low voltage, low power consumption and many other advantages, although the cost is relatively high, but the amount of post-natal costs will decline, and certainly there will be consumers. According to its disclosure, the current cost of LED TVs has been down a lot earlier than 2009, the cost is expected to decline further, with the gap between the cost of ordinary CCFL will be further reduced.

In March, Samsung launched a number of LED TV in one fell swoop, in the conference and the first LED TV in size to include 40-inch, 46 inch, 55-inch products, models have been identified as the 6000/7000/8000 series, the current 6000/7000 Series LED LCD TV has been officially unveiled in the Chinese market.

Liu Quanen also said two years ago, LCD TV with LED backlight in the breakthrough technology used, developed significantly reduce the number of LED technology used can be the required 52-inch LCD TV panels from the original number of more than 1,000 LED down to more than 30, significantly reducing costs. I believe LED backlight on the LCD TV will surely be more widely used, so that the image quality of LCD TVs to reach a new level.

It is understood that Hisense, Samsung, Sony, Sharp and other companies involved in the first LED television research and development and to achieve mass market product, although the LED on the market price higher than the traditional TV, but in the mainstream flat-panel TV manufacturers and foreign and advocacy to promote business, consumer market LED television rising awareness has been put on the market of LED product has a hot scene.

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