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What are the four indicators of LED large screen products?

by:Atop     2020-06-11
LED large screen industry from the start, trying to establish a LED large screen industry standards organizations, to correctly guide users to understand the performance of the LED large screen, standardize the market for LED large screen. So what is the primary indicator of the big four LED large screen? 1. Full brightness for "brightness" biggest characteristics of the important performance has no clear requirements. Because of the use of LED large screen environment differ in thousands ways, intensity of illumination, Generally people say environmental brightness) Is different, so, for the most sophisticated products, as long as the standards specified in the corresponding test method, a performance data is provided by the supplier ( Product information) Schedule is better than the specific performance requirements given in the standard. These are in conformity with the international standard, but it also caused the impractical in the bids of one-upmanship, users don't understand this, leaving many requirements in the tender "brightness" biggest often is much higher than the actual need. Therefore, it is suggested that in order to guide the user to understand correctly the performance index of the maximum brightness of LED display, the industry it is necessary to give a guidance: in some occasions, under the environment of the use of different intensity of illumination, LED large screen brightness at what value can meet the requirements. 2. Gezer main wavelength error to gezer main wavelength error indicators, change from "gezer wavelength error" to "gezer main wavelength error," more telling this indicator reflects the LED large screen, a what features. Observed color of dominant wavelength is equivalent to the human eye color is tonal, is a psychological, is an attribute of a color distinguish each other. And the industry standard of performance requirements, literally, the user will not be able to learn it reflect the LED large screen color is an indicator of uniformity. Therefore, is to guide the user to understand the term, then understand this metric? Or first of all, from the perspective of customer knowledge and understanding of LED large screen, to give users can understand the characteristics of simple? Product standards of one of the principle of the principle of "performance" : "as long as possible, requirements should be expressed by performance characteristics, without having to design and describe the characteristics to express, this method gave the biggest leeway to technology development". "Gezer main wavelength error" is such a design request, if by "color uniformity" instead of, there is no limit what wavelength of LED large screen for the user, as long as you promise the LED large screen color is uniform, and don't have to consider what you are using technology to achieve, as large as possible the leeway for technology development, it is good for the development of industry greatly. 3. Duty ratio as the above principle of "performance" "as long as possible, requirements should be expressed by performance characteristics, without having to design and describe the characteristics to express, this method gave the biggest leeway to technology development". We believe that the "duty cycle" is purely a design technical requirements, should not be used as a LED large screen product standards performance indicators; You made it clear that what the user would care about the LED large screen drive duty ratio, they care about is the effect of display, rather than our technical implementation; Why should we make this kind of technical barriers, limiting industry technology development? 4. Refresh rate from the point of measurement, seem to ignore the question of what users really care about, it is not very good considering the various manufacturers of drive IC, drive circuit and the way is different, cause the difficulty of the test. Of full-color LED large screen tender, such as shenzhen stadium in expert sample testing, the indicators of the test leads to many problems. The frame display "refresh rate", the reciprocal of the time required, the LED large screen as a light source, that is the flicker frequency source. We can use a similar "light frequency meter" direct test instrument display light blinking frequency, to reflect the index. We have done the test using either color LED drive current waveform oscilloscope measurement to determine the "refresh rate", in the white fields measured 200 hz; Under the low gray level such as grey level 3, the measured frequency up to 10 k Hz, and PR - 650 spectrometer measurement; In both the white field, and in 200, 100, under the grayscale level 50 and so on, the metering source flicker frequency of 200 Hz. Above just according to the characteristics of several LED large screen to do a simple instructions, there are many in the bidding of the "service life" and "mean time between failures, and so on," is not a kind of test method can be confirmed in a relatively short time of LED large screen whether conform to the requirements of the stability, reliability and life; These requirements should not be prescribed. Producers can make a guarantee, but not a substitute for requirements, it is a business concept, the concept of contract, rather than technical concepts. Industry should be a clear statement to this, for the users, producers and the whole industry will be very beneficial. For how to guide the user correct understanding of LED large screen such a complex system, product, or industry association make more LED large screen technology BBS, from set out actually, guide users understanding of LED large screen.
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