In fact, just like the development of LED technology, what is the low power consumption? Just as there is no measure of high service life, LED technology manufacturers have different views on the future prospects of the industry. In the senior expert Hong Bing said that "LED general lighting will be popularized in 3-5 years," Tony Armstrong, marketing director of Linear Technology's power products, said in an interview: "We expect that after another 7 to 9 years, the family LED lighting will not be popular."
But whether it is Hongbing or Tony, there is one opinion that is consistent---for LED technology, the driver IC is still very necessary. Tony said that LED as a sensitive semiconductor, any slight current change will cause changes in the brightness of the product. In the absence of the driver IC, the current technology, LED consistently emphasizes the stability of the source characteristics. Moreover, current/voltage variations can have a large impact on the life of the product.
Q: Product price has always been the biggest obstacle for LED lighting technology to enter ordinary families. How to reduce product cost? When do you expect LED lighting to really enter thousands of households?
Tony: LED residential lighting may still need more development to become mainstream. The main obstacles to the use of LED lighting in homes are cost and aesthetic issues. Linear Technology is engaged in the LED driver business, which costs only a fraction of the total cost of producing a traditional 70W incandescent lamp. However, our LED drivers can help reduce the manufacturing cost of LED lamp replacement because these LED drivers provide high efficiency conversions that minimize the size and cost of LED lamp heat sinks. We anticipate that home LED lighting will not be popular in another seven to nine years.
Q: At present, it is generally believed that OLED and LED are two mutually opposing technologies. OLEDs are sought after by many companies because of their higher brightness and lighter weight. Does your company have OLED products, how to locate these two technologies?
A: OLED is an electroluminescent LED whose emitter consists of an organic compound film. This film typically contains a polymer that allows for the deposition of suitable organic compounds. These organic compounds are deposited in rows and columns onto a flat support by a simple "printing" process. The pixel matrix thus formed can emit light of different colors.
Such systems can be used in television screens, computer monitors, cellular phones and PDAs, watches, advertising, small portable system displays that provide information and instructions. OLEDs can also be used in light sources for general space lighting and large area lighting assemblies. Compared to inorganic solid-state LEDs, OLEDs typically emit less light per unit area, and inorganic solid-state LEDs are typically designed for use as point sources.
In a display environment, OLEDs have significant advantages over traditional liquid crystal displays (LCDs). OLEDs do not require backlighting to work. As a result, OLEDs can display deep black levels, consume much less power, and can be much thinner and lighter than LCD panels. With cold cathode fluorescent lamps (CCFLs) and newer LED backlighting, OLED displays have naturally achieved much higher contrast than LCD displays.
OLED displays require positive and negative bias supplies for proper operation. Linear Technology offers highly integrated solutions for OLED bias applications. Key features include output disconnect, soft start and integrated Schottky diodes. The small circuit size and high efficiency of these solutions make them ideal for space-conscious portable device applications such as cellular phones and media players.
Q: The life of LED driver products largely limits the service life of LED products. How to solve the contradiction between the two?
A: LED is a kind of semiconductor device that emits visible light when passing current through the LED. LEDs use less energy than incandescent lamps, typically 25% less. And depending on the calculation method, LED lights have a life of at least 10,000 hours, and some even claim to be up to 50,000 hours. In contrast, incandescent lamps have a life span of between 1,200 hours and 1,500 hours. This clearly shows that LED lamps may last 10 to 15 times longer than incandescent lamps.
However, if the drive is not properly installed, the LED's lifetime and light output may be negatively affected. Fundamentally, an LED is a semiconductor device that consumes its own heat by conduction rather than radiation. As a result, heat and current overdriving of these devices are the two major factors that contribute to the shortened operating life of LEDs. Therefore, the accessory must be carefully and properly dissipated so as not to exceed the specified operating temperature range of the LED. Similarly, the LED driver circuit must be treated with care to prevent excessive current from being driven into the LED itself.
Q: According to reports, some manufacturers have begun trial production of driverless LEDs, which is undoubtedly fatal for many manufacturers specializing in LED driver chips. Do you think the driverless LED can replace the driver LED? How do you view the relationship between the two?
A: It is too early to say whether the driveless LED is commercially and economically viable. However, we believe that there are plenty of opportunities for LED driver ICs, both today and for the foreseeable future.
Q: According to analysts: In the next 3 to 5 years, the existing LED market of 100 million US dollars will expand more than 10 times. Do you think that the most important growth areas of LEDs will appear there in the next few years? LED lighting? LED backlight? Mobile devices or automotive electronics?
A: We believe that LED backlighting today accounts for more than 50% of the LED market and is primarily driven by mobile communications. However, it is expected that the income growth curve of this market will be flattened in the future.
However, it is clear that brighter and more powerful LEDs are growing strongly. This trend is due to the growth of lighting applications such as street lighting and building lighting. In addition, as LEDs continue to be used as headlights, instrument panel backlights, and internal vanity lamps, the use of LEDs in the automotive market will grow significantly in the future.
Q: In 2010, what are your main products in the field of LED technology? What is the characteristic?
A: There are a number of facilitating factors that have led to a shift in the demand for LED driver ICs from the current post-emergence phase to the accelerated growth phase. Clearly, LEDs will become the mainstream source of illumination in a variety of applications. Among the main drivers of this shift are automotive lighting, large flat panel LCD HDTVs, LED light output, LED cost factors and the potential use of LEDs to replace incandescent lamps.
Audi is the first car manufacturer to use LED headlights in a variety of models. Their lighting system consists of two low-beam headlights that serve as the primary illumination, consisting of two LED arrays and four active components per array. This lighting system was originally offered as an optional accessory in the 2008 R8 luxury sports car, but is becoming more mainstream in other Audi models. In addition, Volkswagen (VW), Lexus and Cadillac have provided such LED headlights in their 2009 models. Starting in 2010, more automakers will follow this trend.
LED driver ICs have many advantages when used to drive LEDs for backlighting HD flat panel TVs. These ICs make LED driver circuit solutions slim, compact and flat.
From moving image blurring to color reproduction, LCD HDTVs have various drawbacks. That is, with the current generation of LCD HDTVs, true black is not available, and the dynamic range of all colors is low. A normal HDTV is backlit with a CCFL tube and provides only a contrast ratio of 450 to 650 cd/m2. The main problem with these HDTVs is that they do not completely turn off CCFL backlighting or local dimming of CCFL backlighting.
Conversely, with high-brightness (HB) LED backlighting, an LED array (up to 1,600 for a 46-inch display) can be locally dimmed or turned off in a backlight "group" to provide a CCFL design The contrast ratio is almost one bit higher (>4,000cd/m2). In addition, by adjusting the brightness of the LED group backlight, more midtones can be reproduced, adding a more vivid picture. Another benefit is the ability to partially turn off the LEDs, which reduces motion blur. By completely turning off the LEDs between frames, the blurring caused by fast moving objects is almost completely eliminated. In addition, the LEDs respond very quickly when solving the fast moving image blur problems commonly encountered in CCFL backlighting LCD TVs. It is also crucial.
As a result of these market trends and demands, Linear Technology's main focus in 2010 will be for large-scale tablets found in applications that use high-brightness LEDs, such as automotive lighting, architectural lighting, and high-definition televisions. Backlighting of the display. (Edit: Looking up at the stars)
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