Detailed explanation of LED display technology upgrade direction

There are many types of new backlights being developed at this stage. A Japanese company has successfully developed a field emission type high-brightness backlight using carbon nanotubes, which is suitable for large-screen displays such as LCDW (wide-screen liquid crystal). In addition to high luminous efficiency, low energy consumption and high brightness, it also has the characteristics of mercury-free, long life and high-speed response.

1. Thin display and high power of LED display

According to current market observations, 20CM thick cabinets still have a large share of global LED displays. The application fields of LED display screens are becoming wider and wider, and the hidden safety hazards are increasing. The thinning and high power of LED display screens have become the production pursuit of most famous manufacturers.

The main competition of LED display is not only the thickness, but also the more economical, energy-saving power consumption and better picture quality. The technical performance advantages in many aspects are the core reasons for the thin LED display and the rapid growth of the high-power market. In the similar products recently launched by Tongpu, the thickness is about 1cm, which is unmatched by traditional LED display.

2. LED display large screen splicing

The splicing wall is an integrated system. There are currently four types. The most commonly used are projection and LED. Among them, 3LCD, DPL and LCOS are commonly used in projection. The price of splicing wall using projection technology is relatively low, and the quality and stability of the picture are relatively high. Therefore, the cost performance is the highest, and it is the mainstream product in the field of splicing wall. Although the price of LED splicing wall is relatively high, it is widely used for digital display outdoors because of its characteristics of resistance to sunlight and wind and rain.

3. Side-emitting dynamic backlight and low power consumption technology

At present, mass-produced large-size TV products all use direct-type CCFL as the light source. This drive requires Invertor technology. Due to power problems, the use of CCFL as the light source consumes more power. With continuous improvement, the power consumption achieved by this technology is close to the limit. The introduction of high-end products, direct-type LED backlights, has reduced the technology of power consumption. With the emergence of high-power LEDs and the improvement of efficiency, the power consumption of direct-type LEDs is continuously decreasing. Direct-type LED backlights also have a breakthrough technology, localdimming (regional control), also known as dynamic backlight technology, greatly reduces the power consumption of the backlight and improves the contrast of TV products, but requires the number of LEDs. There are many, the thickness of TV products is relatively large, and the aesthetics and flexibility are slightly inferior. Later launched side-illumination LED large-size backlight technology, which combines the advantages of ultra-thin, beautiful and low power consumption. It is expected that the use of localdimming technology in the large-size side-emitting LED backlight can greatly reduce the power consumption of the backlight. The direct-type LED dynamic backlight is combined with image processing, and the LED reduces the current or voltage in dark places, which requires higher drive circuit technology, but greatly reduces the power consumption of the backlight. The side-entry LED backlight source achieves regional control through LED cross control to reduce power consumption to a certain extent. The side-entry LED large-size backlight source combines various advantages. If a breakthrough is made in localdimming, it will be another improvement in technology.

4. Consider direct packaging of heat dissipation materials on the LED package

An important issue to be faced by the large-size LED backlight products developed and designed now is heat dissipation. The direct-lit LED large-size backlight has a certain amount of light mixing height, which has a certain help for heat dissipation, and a corresponding heat dissipation plate will be made on the entire LED large board to achieve the heat dissipation effect. Since the power of the LED lamp is relatively high and a certain amount of energy is released in the form of heat, the backlight has strict requirements on thermal reliability. Overheating affects the performance of circuit components, reduces the luminous efficiency of the LED lamp, and causes wrinkles in the film material. The phenomenon causes the backlight mura (uneven, spotted) to be defective, the local temperature of the backlight to be overheated, and the unstable operation of the liquid crystal during the aging test of the module. However, the large-size LED side-emitting backlights that are currently in mass production are required to reduce the number of light bars and increase the power of the lights, and require higher heat dissipation for LED light bars. The current technology is that the light bar uses an aluminum substrate. The light bar needs a heat dissipation bar when assembled to the backlight. The structure should be matched with better heat dissipation, but as the light bar decreases later, the number of corresponding lights decreases and the brightness of the lamp increases. It is a challenge to the existing technology. Later trends focused on the luminous efficiency of LEDs. The higher the luminous efficiency, the lower the heat generated. From the perspective of LED lamp packaging technology, directly encapsulate the heat dissipation material to achieve better heat dissipation. With the improvement of packaging technology, the heat dissipation of LED lamps will be better. And now all LED manufacturers are studying the module of LED lights. This technology is to encapsulate multiple chips under one module and do heat treatment accordingly. The light mixing in the Lightbar module reaches the best state, and it is better to use ceramic packaging Heat dissipation, power promotion to 100lm / W.

5. Direct-thin ultra-thin technology

At this stage, large-size direct-lit LED backlights are developing to large-size side-entry LED backlights, following the low-carbon, green, environmentally friendly, ultra-thin, and high-color display requirements. Lateral-type LED backlights are in the late dynamic area Controlling the backlight source does not reach the optimal 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 at the shortest distance, and improves the transmission efficiency of the light source in the LGP, changing the original side entry type due to the long distance transmission. The problem of light loss. At the same time that the large-size direct-type backlight is ultra-thin, it completes localdimming technology to achieve low power consumption, and uses RGB LED or high-power white LED (RGB phosphor) based on the direct-type technology to achieve ultra-thin and low Power consumption, high-color backlight products.

6. Increasingly improving the upstream, middle and downstream of the supply chain

With the development of backlight technology for large-size TVs, LEDs have gradually replaced CCFLs. In notebook computers, LEDs have been widely used, and Monitor is also increasing rapidly. The supply of LED lights is now an issue of concern to everyone. Now the backlight manufacturers are bound to the LED packaging factories, or the backlight manufacturers have their own LED packaging factories. In the supply chain, the backlight manufacturers are considering LED packaging factory is accepted as its own partner. The global supply of patented chips is in short supply. If you have your own LED factory, you will have certain advantages 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 factories are top priorities.

7. New technologies are constantly emerging

Because multiple LEDs on the Lightbar replace one CCFL tube, the brightness and chromaticity of each LED lamp are required to be in the same Rank (range) value, which increases the cost of the LED. LEDs are divided into multiple brightness files and more color blocks due to chips, mixed phosphors, and packaging technology. Each backlight manufacturer has different production requirements, but only a small part of all the blocks are packaged in this way. A large part of the product will be scrapped, increasing the cost. Now some manufacturers have introduced the same brightness file based on the chroma mixing technology to achieve the white light phenomenon, and the backlight state is the required chroma range, which can reduce costs to a certain extent. Now under the direct-lit LED backlight, through localdimming technology and circuit drive, the mixing technology of different brightness and different chroma is completed to meet the needs of mass production and successfully reduce the cost of LED.

There are many types of new backlights being developed at this stage. A Japanese company has successfully developed a field emission type high-brightness backlight using carbon nanotubes, which is suitable for large-screen displays such as LCDW (wide-screen liquid crystal). In addition to high luminous efficiency, low energy consumption and high brightness, it also has the characteristics of mercury-free, long life and high-speed response.

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