What are the ways to never black screen a small pitch LED display?
LED display is not an unusual electrical appliances in the factory a molding, but according to customer requirements, installation environment, etc. for the site production of a product, failure rate than other electrical appliances to be much higher, so the site production of the rigor of the staff and manufacturers of after-sales requirements are very high. In recent years, the application of small pitch led display is becoming more and more popular, by virtue of the unique advantages of the display effect, its application places from the lower to the ordinary conference room, monitoring room, exhibition applications, up to the national conference center, monitoring center, CCTV, and large-scale events. But as a new technology and high-precision equipment, user demand in addition to the excellent display effect, but also accompanied by stability considerations, because, once the main venue black screen, will cause major international impact, and even political impact, such as the Tianjin National Games, the 5-ring to 4-ring.
Small pitch LED display application field analysis
As a new generation of indoor professional field display panel, small pitch LED on the traditional DLP formed the most direct impact, in other words, that is to say small pitch LED in the application of the product is in fact on the formation of DLP technical replacement. But this kind of substitution is not a simple one to one. Small pitch LED display and DLP is still a big difference between the application, so in different projects, the technical selection of the screen is particularly important.
Therefore, small pitch LED as the main screen of the venue, its stability assessment is the center of gravity, the first one is not black screen.
Because of this demand, we analyze the reasons for the black screen in depth, in order to fundamentally exclude the black screen hidden danger, truly never black screen. led display for electronic devices, the internal control card chip for the FPGA, there is no operating system, so you can cause the black screen is categorized as 2 most of the reasons, one is device failure, a cable failure.
1: device failure
Device failure mainly occurs in the receiver card and switching power supply 2 devices.
A: Receiver card
Receiving card on a wide range of devices, an ordinary receiving card collection of 2 Gigabit network communication interface, 120P light board driver interface, and SDRAM, FLASH, etc., more than 10,000 points of soldering, because the LED for the inductive load, resulting in a more complex working environment. Some manufacturers in order to pursue ultra-thin and sacrifice the internal cooling space, the use of mini small card, etc., its electronic device contacts, complex electromagnetic environment, internal high thermal environment, resulting in reduced work stability, an occasional capacitor failure may cause the screen display is not normal.
B: switching power supply failure
LED display for the inductive load, and output load with the screen changes, the internal device impact, coupled with the switching power supply internal capacitance, and some manufacturers in order to reduce the use of cost, the use of switching power supply with automatic fan cooling. Due to both capacitance, or fan there is a short service life, so it has become a switching power supply failure is one of the most frequent causes, and in the whole device equipment caused by power failure black screen failure in the first place.
2: cable failure
Cable failure is mainly divided into external connection cables, such as the screen to provide power and signal cables, and internal cable failures, such as internal DC power lines, internal gray lines.
A: external cables
Among the external cables, the signal cable has the highest failure rate and the greatest impact. Display screen routinely used signal cable for cat5e cable, which is difficult to ensure the stability of signal communication due to factors such as material construction, especially the 2-end crystal head butt joints, vibration resistance is relatively poor.
B: internal cables
Internal cables are mainly gray wires. Gray wire is mostly cold-pressed production, many times after the insertion and removal of contacts are very easy to poor contact, serious and even gray wire fracture, so the internal cable failure is the highest incidence of all cable connection failure.
Above analyzed several reasons for black screen, we will be the right remedy, from the design end of the above problems shielded, to fulfill the promise to customers and users – never black screen.
Compared with the traditional receiver card design program, our design uses no receiver card program, the product is highly integrated.
The led display adopts a higher degree of integration of the special chip designed on the adapter board. The chip internal integration of the conventional receiver card in the gigabit network communication, FPGA, SRAM, FLASH, MCU, etc., from the original 7 IC is now 1 IC, highly integrated, reducing 80% of the solder joints connected to the front-end from the failure rate of electronic devices to reduce, and thus improve system stability.