Analysis on the upgrade direction of innovative technology LED display technology

Author: From: Time: 2019-10-17

LED display large screen stitching

The splicing wall is an integrated system. There are currently four types. The more common ones are projection and LED. Among them, projections are commonly used in 3LCD, DPL and LCOS. The price of the splicing wall using projection technology is relatively low, and the quality and stability of the picture are relatively high, so the cost performance is the highest, which is the mainstream product in the field of splicing walls. Although LED splicing walls are relatively expensive, they are widely used for outdoor digital display because of their resistance to sunlight and wind and rain.

side-lit dynamic backlight and low-power technology

Nowadays, the large-scale TV products that are generally mass-produced use direct-type CCFLs as the light source. This type of drive requires Invertor technology. Due to power problems, the use of CCFL as a light source consumes a lot of power, with the technology. Increasingly, the power consumption achieved by this technology is already close to the limit. With the introduction of high-end products direct-lit LED backlights, the technology to reduce power consumption has reached a new level. With the emergence of high-power LEDs and improved efficiency, the direct-type power consumption is continuously decreasing. The direct-lit LED backlight also has a breakthrough technology. Localdimming (regional control) is also called dynamic backlight technology, which greatly reduces the power consumption of the backlight and improves the contrast of the TV product, but requires the number of LEDs. More, the thickness of TV products is relatively large, and the aesthetics and flexibility are slightly worse. The later-launched side-illuminated LED large-size backlight technology combines the advantages of ultra-thin, beautiful, and low power consumption. It is expected that the localdimming technology can be greatly reduced in the large-size backlight of the side-emitting LED, which can greatly reduce the power consumption of the backlight. The direct-lit LED dynamic backlight is combined with image processing. In the dark place, the LED reduces the current or voltage. This requires relatively high technical requirements for the driver circuit, but greatly reduces the power consumption of the backlight. The side-in LED backlight is controlled by LED cross-over to achieve regional control and reduce power consumption to a certain extent. Side-in LED large-size backlights combine various advantages. If breakthroughs are made in localdimming, it will be another improvement in technology.


LED display is thin, high power

According to current market observations, the 20CM thick-type cabinets still have a large amount of LED display screens. The application fields of LED display screens are becoming more and more wide, and the hidden dangers of safety are increasing. The thinness and high power of LED display screens have become the pursuit of most famous manufacturers.

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


LED display large screen stitching

The splicing wall is an integrated system. There are currently four types. The more common ones are projection and LED. Among them, projections are commonly used in 3LCD, DPL and LCOS. The price of the splicing wall using projection technology is relatively low, and the quality and stability of the picture are relatively high, so the cost performance is the highest, which is the mainstream product in the field of splicing walls. Although LED splicing walls are relatively expensive, they are widely used for outdoor digital display because of their resistance to sunlight and wind and rain.

 

side-lit dynamic backlight and low-power technology

Nowadays, the large-scale TV products that are generally mass-produced use direct-type CCFLs as the light source. This type of drive requires Invertor technology. Due to power problems, the use of CCFL as a light source consumes a lot of power, with the technology. Increasingly, the power consumption achieved by this technology is already close to the limit. With the introduction of high-end products direct-lit LED backlights, the technology to reduce power consumption has reached a new level. With the emergence of high-power LEDs and improved efficiency, the direct-type power consumption is continuously decreasing. The direct-lit LED backlight also has a breakthrough technology. Localdimming (regional control) is also called dynamic backlight technology, which greatly reduces the power consumption of the backlight and improves the contrast of the TV product, but requires the number of LEDs. More, the thickness of TV products is relatively large, and the aesthetics and flexibility are slightly worse. The later-launched side-illuminated LED large-size backlight technology combines the advantages of ultra-thin, beautiful, and low power consumption. It is expected that the localdimming technology can be greatly reduced in the large-size backlight of the side-emitting LED, which can greatly reduce the power consumption of the backlight. The direct-lit LED dynamic backlight is combined with image processing. In the dark place, the LED reduces the current or voltage. This requires relatively high technical requirements for the driver circuit, but greatly reduces the power consumption of the backlight. The side-in LED backlight is controlled by LED cross-over to achieve regional control and reduce power consumption to a certain extent. Side-in LED large-size backlights combine various advantages. If breakthroughs are made in localdimming, it will be another improvement in technology.

 

LED package is considered to directly package heat dissipation materials

An important issue to be faced in the development of large-size LED backlight products is the heat dissipation problem. The direct-type LED large-size backlight has a certain amount of light-mixing height, which helps the heat dissipation, and the heat-dissipating plate is correspondingly formed on the entire LED large plate to achieve the heat dissipation effect. Since the power of the LED lamp is relatively high now, and a certain amount of energy is released in the form of heat, the backlight has strict requirements on thermal reliability, and the overheating affects the performance of the circuit component, reduces the luminous efficiency of the LED lamp, and causes wrinkles in the film material. The phenomenon causes the backlight mura (uneven, specked) to be poor, and the local temperature of the backlight is overheated. When the module is subjected to the aging test, the liquid crystal is unstable. Nowadays, the development of mass-produced large-size LED side-illuminated backlights requires a reduction in the number of light bars, an increase in the power of the lamps, and a higher requirement for the heat dissipation of the LED strips. The current technology is to use an aluminum substrate for the light bar. The light bar needs a heat dissipation strip to be assembled on the backlight, and the structure should be matched with better heat dissipation. However, as the light bar is reduced, the number of corresponding lamps is reduced, and the brightness of the lamp is increased. It is a challenge to the prior art. The later trend focuses on the luminous efficiency of the LED, and the higher the luminous efficiency, the lower the heat generated. From the perspective of LED lamp packaging technology, the heat dissipation material is directly encapsulated into the inside to achieve better heat dissipation effect, and the heat dissipation of the LED lamp will be better as the packaging technology is improved. And now every LED manufacturer is studying the module of LED light. This technology is to pack multiple chips under one module and heat-dissipate accordingly. The light mixing in the Lightbar module is optimal, and the ceramic package is better. Cooling, power boosting to 100lm/W.


direct-type ultra-thin technology

At this stage, large-size direct-lit LED backlights are developing toward large-size side-entry LED backlights, following low-carbon, green, environmentally friendly, ultra-thin, high-color display requirements, and side-in LED backlights in later dynamic regions. Controlling the backlight is not optimal, and it needs to be thinner in direct-lit backlight technology. Through the micro-structure processing of the LGP and printing on the light guide plate, the LED lamp achieves 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 long-distance transmission. The problem of light loss. In the large-size direct-type backlight to achieve ultra-thin, complete localdimming technology to achieve low power requirements, and use RGBLED or high-power white LED (RGB phosphor) based on direct-down technology to achieve ultra-thin, low-power A high-quality, backlit product.


The middle and lower reaches of the supply chain are increasingly perfect

With the development of large-size TV backlight technology, LEDs have gradually replaced CCFL. In notebook computers, LEDs have been used in large quantities, and Monitor is also rapidly increasing. The supply of LED lights is now a concern of everyone. Now the backlight manufacturers are bound to the LED packaging factory, or the backlight factory has its own LED packaging factory. In the supply chain issue, the backlight manufacturers are considering LED packaging factory is its own partner. The supply of global patent chips is in short supply. If you have your own LED factory, you must have certain advantages in the supply chain. With the development of large-size LED backlights, the demand for LED lights is growing. How to choose LED lights and how to cooperate with LED lamp factories is a top priority.


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 range, which increases the cost of the LED. Due to the chip, the mixed phosphor and the packaging technology, the LED is divided into multiple brightness files and more color blocks, and the mass production requirements of each backlight manufacturer are different, but only a small part of all the blocks are packaged. A large portion of the product will be scrapped, adding to the cost. Now some manufacturers have introduced the basic chroma mixing technology of the same brightness file to achieve the white light phenomenon, and the required chromaticity range in the backlight state can reduce the cost to a certain extent. Now under the direct-lit LED backlight, through localdimming technology, using circuit drive to complete the mixing technology of different brightness and different chromaticity, to meet the mass production requirements, and successfully reduce the LED cost.

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