1, LED backlight development to ultra-thin direction
(I) LED thinning, high power, and thinner light guide plate
According to market research firm Display Search, global LED LCD TV sales in 2009 was about 4.09 million units, accounting for only 3% of the entire flat-panel TV market, but sales will soar to more than 123 million units by 2014, accounting for the entire flat-panel TV Market share also soared to 53%.
LED TV is not a new type of display technology in nature, but it is simply the application of a new type of LED light source technology to replace the traditional cold cathode fluorescent lamp. However, this type of LCD TV with side-mounted LED backlight has a slim body that is incomparable with traditional products: At present, the thickness of LED TVs produced by most famous manufacturers is about 2cm. This thickness is unmatched by traditional LCD TVs. of.
LED TV is not only the thickness of the main competition, but also includes more economical, energy-efficient power consumption, and even better picture quality. The technical performance advantage in many aspects is the core reason for the rapid growth of the LED TV market.
(B) Frameless
Although LCD TVs can't really achieve "borderless" - this is just an exaggerated description of the ultra-narrow frame. However, industry experts have predicted that borderless products will become another peak of LCD TV technology design after ultra-thin.
In fact, as early as three years ago, many LCD companies, including Samsung, have invested in ultra-narrow frame product development. However, these technologies are mainly used in engineering display areas such as LCD TV mosaic walls. In April of this year, the narrowest frame thickness of a LCD splicing wall product launched by Samsung in the domestic market was less than 3mm. Thereafter, companies including Sharp, LG, and Chi Mei of Taiwan also successively introduced liquid crystal display panels capable of meeting the thickness of a millimeter-level frame. For the entire machine company to choose. The support of many upstream manufacturers, on the one hand, shows the actual value of the non-rimless technology, and on the other hand, it shows that the technical bottleneck of making LCD frames with millimeter-level or even lower-level borders has been basically broken.
2. The LED backlight source meets the market's green and environmental protection concept
At this stage, large-size TV backlights are mainly based on direct type, and now EU standards, domestic standards, products must comply with RoHS standards, UL standards, and later added a halogen-free requirements. The widely used CCFL products now contain Hg in the lamp. Due to this characteristic, the standard adds the exemption of the substance, that is, the substance is qualified and available in a certain amount of circumstances. However, the Hg-containing substances in the CCFL are still in violation of the current environmental protection requirements. The current products require green and environmental protection. In the backlighting of notebooks, the use of LEDs in notebooks has reached the point of no Hg requirements for backlight products. The emergence of large-size LED backlights coincides with the current green and environmental protection requirements of the market.
3, side-emitting dynamic backlight and low-power technology
Currently, mass-produced large-size TV products use direct-type CCFLs as light sources. This type of driving requires Invertor (reverse-conversion) technology. Due to power problems, using CCFLs as light sources consumes relatively large amounts of power. With continuous improvement, the power consumption achieved by this technology has approached the limit. With the introduction of high-end direct-type LED backlights, the technology for reducing power consumption has reached a stage. With the advent of high-power LEDs and improved efficiency, direct-type power consumption is continuously decreasing. Direct-type LED backlighting also has a breakthrough technology, localdimming (zone control) is also called dynamic backlight technology, which greatly reduces the power consumption of the backlight source and improves the contrast ratio of the TV products, but the number of LEDs is required. More often than not, the thickness of television products is relatively large, and aesthetics and flexibility are somewhat poorer. The late-generation side-emission LED large-size backlight technology combines the advantages of ultra-thin, beautiful and low power consumption. It is expected that the use of local dimming technology in side-emitting LED large-size backlights can greatly reduce the power consumption of the backlight. The direct type LED dynamic backlight source is combined with image processing. In a dark place, the LED lowers the current or voltage, so the technical requirements of the driving circuit are relatively high, but the power consumption of the backlight source is greatly reduced. The side-entry LED backlight is controlled by the LED crossover to achieve regional control and reduce power consumption to some extent. Side-entry LED large-size backlights combine various advantages. If a breakthrough is made in local dimming, it will be another improvement in technology.
4, consider the direct package heat sink material on LED package
One of the important issues facing the development and design of large-size LED backlight products is cooling. The direct-type LED large-size backlight source has a certain amount of mixed light height, which has certain help for heat dissipation, and the heat dissipation plate is correspondingly implemented on the entire LED large board to achieve the heat dissipation effect. As the power of LED lamps is relatively high, and there is a certain amount of energy released in the form of heat, the backlight requires strict thermal reliability. Overheating affects the performance of circuit components, reduces the luminous efficiency of LED lamps, and produces folds on the film. The phenomenon causes the backlight mura (non-uniform, spotted) to be poor and the local temperature of the backlight to be overheated, resulting in unstable operation of the liquid crystal when the module is subjected to an aging test. Now, the large-scale LED-side light-emitting backlights that are being mass-produced are required to reduce the number of light bars and increase the power of the light, which has a higher requirement for the heat dissipation of LED light bars. The current technology is the use of aluminum light bar, the light bar in the assembly to the backlight need cooling strips, the structure should cooperate with better heat dissipation, but later with the reduction of light strips, the corresponding number of lights decreases, the brightness of the lamp increases, It is a challenge to the existing technology. The late trend is focused on the luminous efficiency of the LED. The higher the luminous efficiency, the lower the generated heat. Considering the packaging technology of LED lamps, heat-dissipating materials are directly encapsulated inside to achieve better heat dissipation effects. With the improvement of packaging technology, the heat dissipation of LED lamps will be better. And now every LED manufacturer is studying the module of LED lamp, this kind of technology is to encapsulate a plurality of chips under a module, and do the heat treatment accordingly, mix light in the Lightbar module to reach the best condition, and use the ceramic package to be better Heat dissipation, power increase to 100lm / W direction.
5, direct type ultra-thin technology
At this stage, large-size direct type LED backlights are being developed for large-size side-entry LED backlights, following low-carbon, green, environmentally-friendly, ultra-thin, and high-color display requirements, and side-entry LED backlights in the later dynamic regions. The control of the backlight source does not reach the optimum value, and it needs to be thinner in the direct backlight technology. By processing the microstructure of the LGP and printing on the light guide plate, the LED lamp meets the light mixing requirement in the shortest distance, and the light source is improved in the LGP transmission efficiency, and the original side entry type is changed due to the long distance transmission. Light loss problem. When the large-size direct type backlight is ultra-thin, local dimming technology is completed to achieve low power consumption, and RGB LED or high-power white LED (RGB phosphor) is used on the basis of direct-type technology to achieve ultra-thin and low Power consumption, high color backlight products.
6, the supply chain is increasingly perfect between the middle and lower reaches
With the development of large-size TV backlight technology, LED gradually replaced CCFL. In notebook computers, LED has been used in large quantities, and Monitor is also rapidly increasing. The supply of LED lights is now a matter of concern to everyone. Now the backlight manufacturers are bound to the LED packaging plants, or the backlight plants have their own LED packaging plants. In the supply chain, the backlight manufacturers are considering The LED packaging factory is its own partner. The global supply of patented chips is in short supply. If you have your own LED factory, you must have a certain advantage in the supply chain. With the development of large-size LED backlights, the demand for LED lamps is increasing. How to choose LED lamps and how to cooperate with LED lamp plants is a top priority.
7, new technologies continue to emerge
Since multiple LEDs on the Lightbar replace one CCFL lamp, the brightness and chromaticity of each LED lamp are required to be in the same Rank value, which increases the cost of the LED. Due to the chip, mixed phosphor, and packaging technology, the LED is divided into a plurality of brightness files and more color blocks, and the production requirements of the various backlight source manufacturers are all different, but only a small part of all the blocks are encapsulated. A large part of the product will be scrapped, increasing the cost. Now some manufacturers have introduced basic shader mixing technology with the same brightness profile to achieve white light, and the backlight source state is the required colorimetric range, which can reduce the cost to some extent. Now under the direct-type LED backlight source, through the localdimming technology, the use of circuit-driven, to complete the different brightness, different color mixing technology to meet the mass production needs, and successfully reduce the cost of LED costs.
There are still many new backlights under development at this stage. A Japanese company has successfully developed a field emission high-brightness backlight using carbon nanotubes that is suitable for large-screen displays such as LCDW (widescreen liquid crystal). In addition to high luminous efficiency, low energy consumption, and high brightness light emission, it also features mercury-free, long life, and high-speed response.
What material should I buy for the sliding door pulley,choose Aluminium Door rubber Roller ,Roller for sliding window and door, Double adjustable roller.
1. Pure metal wheel
Advantages: large bearing gravity, wear resistance and no deformation
Disadvantages: the sliding is not smooth enough, and it is easy to produce friction sound when pushing and pulling.
2. Rubber wheel
Advantages: non drying lubricating ester is attached to the surface of casters, so it can be pushed and pulled easily and smoothly without friction sound.
Disadvantages: the rubber wheel is composed of different materials, so the density of the rubber wheel is also different, resulting in the deviation of the center of gravity of the pulley, so the pulley is easy to derail during use.
3. Metal nylon double in one pulley
Advantages: the metal nylon double in one pulley has the advantages of large bearing capacity, pressure resistance, wear resistance and smooth sliding. It is developed based on the complementary principle of pure metal wheel and rubber wheel and the dynamic balance positioning principle of four wheels of oil vehicle, without eccentricity and wear. Therefore, many integral wardrobe now use this pulley to ensure the practicability of the wardrobe and facilitate people's life.
How to select sliding pulley
1. Look at the material of the pulley and the tightness of the wheel seat
Brief analysis: firstly, the pulley material must be strong and durable, and secondly, the pulley seat must also have certain weight resistance and sealing. Generally, 304 stainless steel and high-end synthetic materials are selected for the wheel seat, which has good sealing performance. Water vapor is not easy to enter the wheel to ensure the smoothness of the wheel.
2. See the fit between pulley and aluminum track
Brief analysis: the pulley and track must be closely matched, and the gap should be small, so that they will not fall off when impacted by external force, so as to avoid safety accidents.
3. Finally, it depends on whether the pulley and track match. It is best to adopt imported stainless steel and fully enclosed bearing structure. No matter how many times the sliding door is operated, it will not affect the service life, and the service life is up to decades.
4. The pulley and track are important, but the pulley should also be maintained during use:
a. When in use, avoid hitting the movable door with force, so as not to cause the movable door to fall off.
b. At ordinary times, the slide rail and pulley shall be cleaned regularly and lubricant shall be filled regularly.
c. The screws of the sliding block shall also be adjusted regularly to ensure the effective bearing and sliding of the sliding block on the movable door.
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