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>> LCD big advantage leading the market, AM OLED full catch-up 5th,March,2018
OLED display market will grow rapidly since 2008, its range of applications will be expanded to laptops and flat-screen TVs and other large-size display.
AM OLED (Active Organic Light Emitting Diode) is considered as one of the most powerful contenders for the existing LCD, PDP display technology because it does not require the use of a backlight panel, it responds faster and has a higher contrast and can be made very slim , But also much lower power consumption. However, LCD technology does not sit still. In response to the challenge from AM OLED, the new technological advances also make the LCD display significantly improved in terms of color performance, contrast, panel thickness and the like, and the power consumption is further reduced. AM OLED technology original lead has been greatly reduced.
The LCD industry has been very mature supply chain and the cost of large-scale production and other advantages, but also to catch up with or even surpass LCD AM OLED technology has set a solid barrier. It can be said that, if you can not re-establish their own technological superiority, or promptly lower the cost of product, AM OLED is likely to be matured by mature technologies such as LCD footprint, which suffocated death.
LCD module embraces low power LED backlighting
DisplaySearch predicts that in 2008 the global flat panel display output will reach 120 billion US dollars by 2015 flat panel display shipments will reach 98% of all displays, becoming the absolute mainstream market, of which LCD accounted for the total shipping area of 88 %, The most important application technology, plasma display technology (PDP) will also account for 8% of the proportion of the remaining 2% of the shipments are flat panel display technologies such as OLED, flexible display division.
The increasing size of LCD terminals is increasingly plagued by power issues. In order to reduce power consumption, LED backlighting, MiniVDS, DFR and many other LCD module manufacturers have become a key topic of concern. In particular, it is even more important to compress power costs on a large energy-hungry backlight.
At present, the LED backlight to replace the CCFL has become the industry's major trends, Sony, Sharp, Samsung and other large-size LCD TVs have begun to use LED backlighting. Li Yaqin Dragon Optoelectronics on the "International Electronic Business" reporter said she belongs to this company is gradually using LED backlight instead of CCFL, this alone will be able to reduce the power consumption of LCD module 2/3. She also said that this trend is particularly evident in notebook devices, "Currently, AUO, LG and Samsung are all doing the same." However, there are not many LED TVs using LCD TVs.
DisplayBank report shows that the current laptop market LED backlight penetration rate of about 13%, while the proportion of LCD TVs is as small as negligible. The report said that by 2012, the above ratio will rise to 60% and 15% respectively. DisplayBank analyst Yu Weilong believes that the main reason for the gap between the two lies in the laptop power consumption, especially standby power requirements more urgent. In addition, due to the smaller screen used in notebook computers, LED backlighting application will be slightly less difficult. In addition, the high cost of LED backlighting is also a major obstacle to its extensive use in LCD TVs. However, with the gradual reduction of costs, this problem will be gradually solved.
Power consumption is not the only reason to convince people to embrace LED backlights. Jacques Le Berre, director of marketing and business development at NXP Solid State Lighting, points out that the trend towards quality and thinness is also an important reason for the popularity of this technology in the future.
Zhang Kaijun: Ambient light sensed by the light sensor to determine the brightness of the backlight, but also to monitor the screen state of the liquid crystal itself can help to reduce power consumption.
"LED dimming gives consumers an unprecedented visual experience." "CCFL lost 50% of the brightness of the video while the LED would not have any such loss and would save a lot of energy," he said. "In addition, Is the IFA or CES conference, can see thin TV has become a trend, LED backlight can save 30 ~ 40mm thickness of the fuselage, this is its advantage.
However, Crystal Technology Co., Ltd. Zhang Kaijun, director of image display business also pointed out that to reduce power consumption and increase panel maximum brightness, the two are basically in conflict, which is LCD TV manufacturers are facing common challenges. From the point of view of driver IC designer, he said that LCD module manufacturers can help to achieve the goal in two aspects. The first one is to improve the efficiency of LED backlight power conversion. The second one is through optical sensor to achieve the most suitable Panel with backlight brightness. Point Crystal technology focuses on the latter's development, the design of ambient light sensor can be sensed by the ambient brightness, to determine the brightness of the backlight, but also to monitor the screen state of the liquid crystal to adjust the brightness of the regional backlight, not only can Reduce power consumption, but also can improve the contrast of the screen.
Microsemi, a driver IC design company that also focuses on optical sensors, has recently launched a large-size LCD TV with RGB LED backlight driver, which integrates with Microsemi's Digital Advanced Zone Lighting (DAZL) LED driver, which supports the backlight LED scanning backlight mode (1-D) and more sophisticated regional dimming mode (2-D).
Scanning the backlight mode greatly reduces the motion blur phenomenon, and the regional dimming mode, in addition to reducing motion blur, but also greatly enhance the contrast, and more energy efficient.
Steve McClure: Large size LCD TVs require a large number of LEDs, which leads to greater heat dissipation issues and higher system costs.
Steve McClure, vice president of marketing for Analog Mixed Signal's product line, said one of the big challenges facing LCD TVs is the need to use a large number of LEDs, leading to greater cooling issues and higher system costs. The DAZL series solves these thermal issues and system cost constraints, enabling manufacturers to make larger LCD TVs at a more affordable price. "The cooperation with CMO demonstrates that Microsemi's DAZL technology can reduce system costs by up to 30% compared to traditional backlight solutions," he said.
In addition, Microsemi's BEST EYE technology allows integrated circuits to achieve the closest spectral response to the human eye, eliminating the need for an infrared filter. This system solution eliminates the need to use expensive compensation circuits while achieving excellent clarity with the lowest power consumption.
Zhang Kaijun also added: "Large-size LED backlight to direct type, in order to achieve the purpose of thin and uniform brightness, the need for more LED particles, accompanied by a higher power consumption, LED luminous efficiency The improvement and innovation of the optical diffuser for the reduction of the number of LEDs is of great help.
The cost of solving the problem may be faster than the industry's expectations. NXP has been in 0-1-2-3-4D dimming aspects have carried out a lot of development and research work. And Le Berre also said that 0D dimming is likely to meet the cost of the market next year. The company is currently promoting is the model already shipped UBA3070 solution. It is reported that 0D dimming LED will be placed at the bottom of the screen, and in 2D / 3D dimming, LED will form a plane behind the LCD panel to ensure a better picture quality performance. "0D dimming will be a breakthrough for LED backlights in mainstream TVs and desktop PCs." Le Berre said, "As for 2D / 3D dimming, the cost is still higher than today's CCFLs and is currently limited to high-end TVs. "
In addition to LED backlighting, the industry is also actively using other methods to solve the power consumption of LCM. Li Yaqin added that. "For example Mini LVDS, Mini LVDS can reduce the energy consumption of the interface greatly because of reducing the signal level from 5V to 200mV compared with LVDS." Of course also include DFR technology, MEMC these make picture quality stronger, Compensation for smear technology, are also the industry's most popular topics. "In addition, she also pointed out that the ability to combine the module system board and the whole system board together, Intel is promoting smart panel technology is also helpful To reduce power consumption, while reducing the overall cost.
AM OLED into a flat display upstart
Although the current LCD occupies the absolute market dominance, but from the perspective of shipments and sales, the future of OLED technology with low power consumption advantages should not be underestimated. OLED is currently in the development and growth stage, market research firm DisplaySearch expects the OLED display market will grow rapidly since 2008, this year's output value will reach 827 million US dollars, up 69%, and that next year, annual growth of OLED production value Rates are expected to reach 83% and 53% respectively.
Its range of applications will also be extended from small-size displays such as cell phones and digital cameras to large-size displays such as notebook PCs and flat-screen TVs. In particular, the agency noted that while mobile phones are still the most sought after market for flat-panel displays, OLED TVs and ultraportable notebooks are a turning point for the future growth of the flat panel display industry.
Zhang Kaijun pointed out that OLED technology has inherent advantages, so once the large-size OLED TV can be mass-produced, the TV brand manufacturers in the packaging, lock the pyramid top of the consumer, accounting for 20% market share. He also said that dot-crystal technology is currently working with Japanese manufacturers of small-size PM OLED, AM OLED manufacturers and the United States, but the details of the part of the current inconvenience.
Among them, AM OLED will be the main driver of the rapid growth of OLED displays. Currently, the major AM OLED suppliers include Samsung SDI, LG Display, Sony and Crystal Electronics. Shipments this year are expected to reach 17 million units, up from last year A substantial growth of 380% or more.
DisplaySearch estimates AM OLED display shipments will reach 118 million units by 2012, exceeding the output of PM OLED (passive OLED) display 108 million units. In addition, based on the output, AM OLED output this year will be based on 422 million US dollars, more than PM OLED display of 405 million US dollars.
Currently AM OLED has been successfully used in 12.1-inch notebook computers, and has WXGA-level (1280 × 768 pixels) resolution, clarity and color effects are better than the LCD display. According to DisplaySearch, the XEL-1, a flat-panel TV using AM OLED panels, was introduced late last year by Sony for its vivid picture quality and super high resolution, which has forecasted the future market prospects of AM OLED displays. Samsung SDI also plans to launch the 14-inch and 15.4-inch AM OLED notebook panels in 2009.
However, Zhang Kaijun also stressed: "Nevertheless, the future of large-size TFT LCD is not pessimistic, because TFT LCD has gone through decades of development, and technology continues to progress, the cost is also declining, these are not from Labs come out only 10 years OLED can be comparable in the short term, so TFT LCD will not disappear, so the LED backlight can still have a place.
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