How to design a high-performance LED display?
1. Thin LED display and high power
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. The thickness of similar products recently introduced by Tongpu is around 1cm, which is unmatched by traditional LED displays.
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, so 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 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 type of 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 on 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. In the dark place, the LED reduces the current or voltage. This 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 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 in the development and design of large-size LED backlight products is heat dissipation. The direct-lit LED large-size backlight has a certain amount of light mixing height, which has certain help for heat dissipation, and a heat dissipation plate will be made correspondingly on the entire LED large board to achieve the heat dissipation effect. Now that the power of LED lamps is relatively high, and a certain amount of energy is released in the form of heat, and the backlight has strict requirements on thermal reliability, overheating affects the performance of circuit components, reduces the luminous efficiency of LED lamps, and wrinkles in film materials The phenomenon causes the backlight mura (uneven, spotted) to be bad, the local temperature of the backlight to be overheated, and the LCD to work unstable when the module is subjected to the aging test. 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 requires a heat dissipation bar when assembled into the backlight. The structure should be matched with better heat dissipation, but as the light bar decreases in the later period, 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 researching LED lamp modules. This kind of 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 packages. Heat dissipation, power promotion to 100lm / W.
If you want to know more, our website has product specifications for LED display, you can go to ALLICDATA ELECTRONICS LIMITED to get more information