Technical problems and quality control scheme of LED electronic display screen

LED electronic display screen is more and more widely used in life, and the technology of large screen display is also improved. At present, liquid crystal display is very promising because of its excellent display effect, but the splicing technology in large screen display has not reached the seamless level, and the success of small LED spacing makes up for this shortcoming and rises successfully. In the mature period of seamless splicing technology of large LCD screen, LED electronic display screen jumped up and occupied the large screen display market.



Solution to technical problems of LED electronic display screen



The first is high light efficiency: the light efficiency of LED electronic display screen can be said to be an important indicator of energy-saving effect. At present, China needs to strengthen the light efficiency effect. To truly achieve high light efficiency, we should solve relevant technical problems from all links of the industrial chain, so how to achieve high light efficiency? This paper will discuss the technical problems to be solved in epitaxy, chip, packaging, lamps and other links.



1. Improve internal quantum efficiency and external quantum efficiency.



2. Improve the light output efficiency of the package and reduce the junction temperature.



3. Improve the lighting efficiency of lamps.



Secondly, from the perspective of high color rendering: there are many light and color quality of LED electronic display screen, including color temperature, color rendering, light and color fidelity, light and color naturalness, tone recognition, visual comfort and so on. At present, we only discuss how to solve the problems of color temperature and color rendering. Making high color rendering LED display light source will lose more light efficiency, so these two factors should be taken into account in the design. Of course, to improve the high color rendering, we must also consider the combination of RGB three primary colors. Here, I also have three methods:



1. Multicolor phosphor.



2. RGB multi chip combination.



3. Phosphor and chip.



Thirdly, in terms of high reliability, it mainly includes failure rate, service life and other indicators. However, there are different understandings and explanations in application. High reliability refers to the ability of products to complete specified functions under specified conditions and within specified time. The main failure types and parameters of LED are serious failure. Life is the representative value of product reliability Generally refers to the statistical average value. For a large number of components, the life of LED devices is the meaning of this description. However, the factors affecting the reliability of LED display products include chip manufacturing, packaging, thermal resistance, heat dissipation and so on. Now that we are talking about this, we hope that enterprises will make two requirements for LED display products on the basis of total quality control:



1. Reduce the failure rate.



2. Prolong the loss and failure time.



The last is to reduce the product cost: at present, many consumers feel that the price is too high when buying LED display screen. Therefore, many LED display screen manufacturers have also taken corresponding measures to reduce the cost. In addition to mass production, they mainly take technical measures to reduce the cost. It is mainly to reduce the cost in the aspects of epitaxial chip, packaging, driving and heat dissipation, so as to fundamentally solve the cost problem of LED display products. Specifically from the following four aspects:



1. Methods to reduce the cost of epitaxial chip.



2. Methods to reduce the cost of packaging.



3. Methods to reduce the cost of lamps.



4. Reduction of other supporting costs.



How to improve the quality and control of full-color LED display



The display effect of full-color LED display screen is directly related to users and audiences. In order to obtain a perfect use experience, we need to control and improve the quality of LED display screen. So, how to control and improve the quality of LED full-color display? What are the important indicators reflecting the quality of special LED for full-color LED display?



As the most critical component of full-color LED display screen, LED device has three reasons:



First of all, LED is the most used key device in the full-color screen machine, and thousands to tens of thousands of LEDs will be used per square meter;



Secondly, LED is the main body that determines the performance of the whole screen optical display, which directly affects the audience's evaluation of the display screen;



Thirdly, led accounts for the largest proportion in the overall cost of display screen, ranging from 30% ~ 70%. The selection of LED determines the quality of more than 50% of the whole display screen. If the LED is not selected well, no matter how good other parts of the display screen are, they can not make up for the defect of the quality of the display screen