The application of large-screen display in life is getting wider and wider, and the technology for large-screen display has also been improved. At present, LCD display is very optimistic because of its excellent display effect, but the splicing technology in large-screen display has not yet reached Seamless level, and LED small pitch successfully compensated for this shortcoming and successfully emerged. During the maturity of LCD large-screen seamless splicing technology, LED display jumped up and occupied the large-screen display market.
LED electronic display technology problem solving
The first is high light efficiency: the light efficiency of led electronic display screens can be said to be an important indicator of energy saving effect. At present, China still needs to strengthen the light efficiency effect. To really achieve high light efficiency, we must solve related aspects from all aspects of the industrial chain. Technical issues, so how to achieve high light efficiency? This article will specifically discuss the technical problems to be solved in several aspects such as extension, chip, packaging and lamps.
1. Improve internal quantum efficiency and external quantum efficiency.
2. Improve the light extraction efficiency of the package and reduce the junction temperature.
3. Improve the light extraction efficiency of lamps.
Secondly, from the point of view of high color rendering: LED electronic displays have many light colors, including color temperature, color rendering, light color fidelity, light color naturalness, hue recognition, visual comfort, etc. Here we are only discussing the solution of color temperature and color rendering. Making high-color rendering LED display light source will lose more light effect, so we must take care of these two factors when designing. Of course, to improve the high color rendering, we must also consider the combination of RGB three primary colors to achieve. Here I also have three methods:
1. Multi-primary phosphor.
2. RGB multi-chip combination.
3. Fluorescent powder plus chip.
Again, in terms of high reliability: it mainly includes indicators such as failure rate and life. But there are different understandings and expositions in the application. High reliability refers to the ability of a product to perform a specified function under specified conditions and within a specified time. The led failure categories mainly include severe failure and parameter failure. And life is a characteristic value of product reliability. : Generally refers to the statistical average. For a large number of components, the life of the led device is the meaning of this description. But the factors that affect the reliability of LED display products are chip manufacturing, packaging, thermal resistance, heat dissipation and so on. Now that we have said this, we hope that enterprises will make 2 requirements on the basis of comprehensive quality control for LED display products:
1. Reduce failure rate.
2. Extend the lost time.
The last is to reduce the cost of the product: at present, many consumers feel that the price is too high when buying LED displays, so they have taken corresponding measures against this many LED display entrepreneurs. , Mainly to take measures to reduce costs by means of technology. Mainly to reduce costs in epitaxial chips, packaging, driving, heat dissipation, etc., so as to fundamentally solve the cost problem of LED display products. Specifically from the following four aspects:
1. The method of reducing the cost of epitaxial chip links.
2. Ways to reduce costs in packaging.
3. Ways to reduce the cost of lighting.
4. Reduction of other supporting costs.
How to control and improve the quality of LED full color display
The display effect of the full-color LED display is directly related to users and audiences. To obtain a perfect user experience, you need to control and improve the quality of the LED display. So, how to control and improve the quality of LED full-color display? What are the important indicators that reflect the quality of LEDs for full-color LED displays?
As the most critical component of a full-color LED display, LED devices have three reasons:
First of all, LED is the most used key device in the full-color screen machine. 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 entire screen optical display, which directly affects the audience's evaluation of the display screen;
Thirdly, LED accounts for the largest proportion of the overall display cost, ranging from 30% to 70%. The choice of LED determines the quality of more than 50% of the entire display. If you can't choose a good LED, the other parts of the display can't make up for the quality defects of the display.
The important indicators reflecting the quality of LEDs for full-color LED displays are:
1. Failure rate
Since the full-color display is composed of tens or even hundreds of thousands of groups of red, green, and blue LEDs, the failure of any color LED will affect the overall visual effect of the display. Generally speaking, according to industry experience, the failure rate before the LED display begins to assemble to aging 72 hours before shipment should not be higher than three-ten thousandths (referring to the failure caused by the LED device itself).
2. Antistatic Capability
LEDs are semiconductor devices that are sensitive to static electricity and can easily cause static electricity failure. Therefore, anti-static ability is crucial to the life of the display screen. Generally speaking, LED human body static mode test failure voltage should not be lower than 2000V.
3. Consistency
The full-color display is composed of countless red, green, and blue LEDs. The consistency of the brightness and wavelength of each color LED determines the brightness consistency, white balance consistency, and chromaticity of the entire display consistency. In general, display manufacturers require device suppliers to provide LEDs with a wavelength range of 5 nm and a brightness range of 1: 1.3. These indicators can be achieved by device suppliers through a spectroscopic color separation machine. Voltage consistency is generally not required.
4. Brightness
LED brightness is an important determinant of display brightness. The higher the brightness of the LED, the greater the margin of the current used, which is good for saving power and keeping the LED stable. LEDs have different angle values. When the brightness of the chip is fixed, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display. Generally, 100-degree LED should be selected to ensure sufficient viewing angle of the display. For displays with different pitches and different viewing distances, a balance should be found in brightness, angle and price.
5. Attenuation characteristics
Red, green, and blue LEDs all have the characteristic of brightness attenuation with the increase of working time. The pros and cons of LED chips, the quality of auxiliary materials and the level of packaging technology determine the attenuation rate of LEDs. Generally speaking, after 1000 hours and 20 mA ambient temperature lighting test, the attenuation of red LED should be less than 10%, and the attenuation of blue and green LED should be less than 15%. The consistency of red, green and blue attenuation is displayed for full color LED The future white balance of the screen has a great influence, which in turn affects the display fidelity of the display.
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