Since 1998, many companies in the LED display industry have been working hard to make their product technology an industry standard to correctly guide users to understand the performance indicators of LED displays and regulate the entire LED display market. It is precisely because of these companies Continuous technological innovation leads to the rapid development of LED displays. So what are the parameters of LED displays that will be very important in 2017? Here we will explain the four major parameters of the LED display that cannot be ignored.

The four major parameters of the LED display that cannot be ignored are as follows:

1. Maximum brightness

No clear characteristic requirements are given for the important performance of "maximum brightness". Because the use environments of LED displays vary widely, and the illumination (which is what most people call environmental brightness) is different, so for most complex products, as long as the corresponding test methods are specified in the standard, the supplier will provide a set of performance data (Product Information) Lists are better than giving specific performance requirements in standards. These are all in line with international standards, but this also leads to unrealistic comparisons in bidding, and users do not understand this. As a result, the "maximum brightness" required in many bids is often far higher than actual needs. Therefore, it is recommended that in order to guide users to correctly understand the "maximum brightness" performance indicator of LED display screens, it is necessary for the industry to give guidance: In some occasions, under different illumination usage environments, what value does the brightness of LED display screens reach? Can meet the requirements.

2. Primary color dominant wavelength error

Changing the primary color dominant wavelength error indicator from "primary color wavelength error" to "primary color dominant wavelength error" can better explain what characteristics of the LED display this indicator reflects. The dominant wavelength of a color is equivalent to the hue of the color observed by the human eye. It is a psychological quantity and an attribute that distinguishes colors from each other. As for the performance requirements stipulated in this industry standard, literally, users cannot understand that it is an indicator that reflects the color uniformity of the LED display. Therefore, should we guide users to understand this term first, and then understand this indicator? Or should we first understand and understand the LED display from the customer's perspective, and then provide easy-to-understand performance characteristics that users can understand?

One of the principles for formulating product standards is the "performance principle." Whenever possible, requirements should be expressed by performance characteristics rather than design and description characteristics. This method leaves the greatest room for technological development. The "primary color dominant wavelength error" is If such a design requirement is replaced by "color uniformity", there is no limit to the wavelength of LED. For users, as long as you ensure that the color of the LED display is uniform, you do not have to consider what technical means you use. This is achieved by leaving as much room for technological development as possible, which is greatly beneficial to the development of the industry.

3.Duty cycle

Just like the "Performance Principle" mentioned above, "Wherever possible, requirements should be expressed by performance characteristics rather than design and description characteristics. This approach leaves the greatest room for technology development." We believe that "occupancy "Ratio" is purely a design technical requirement and should not be used as a performance indicator of LED display product standards; everyone knows very well that which user cares about the driving duty cycle of the display? What they care about is the effect of the display. , rather than our technology implementation; why should we create such technical barriers ourselves and restrict the technological development of the industry?

4. Refresh frequency

Judging from the measurement method, it seems that it ignores the real concerns of users, and it does not take into account the different driver ICs, driver circuits and methods used by various manufacturers, which makes testing difficult. For example, in the full-color screen bidding of Shenzhen Stadium, in the sample testing by experts, the testing of this indicator caused many problems. "Refresh frequency" is the reciprocal of the time required to display a frame of picture. Treat the display screen as a light source, that is the flashing frequency of the light source. We can use an instrument like a "light frequency meter" to directly test the light source flicker frequency of the display screen to reflect this indicator. We have done tests in this area and used an oscilloscope to measure the LED drive current waveform of any color to determine the "refresh frequency". It measured 200Hz in white field; at low grayscale levels such as level 3, the measured frequency was as high as More than ten kHz, measured with PR-650 spectrometer; whether in white field or at grayscale levels such as 200, 100, and 50, the measured light source flicker frequency is 200Hz.

The above points are just a brief explanation of the four major parameter characteristics of LED displays. There are also many LED display parameters such as "working life", "mean time between failures" and so on that are encountered in bidding. There is no way to explain them all in detail. At present, there is no test method that can confirm in a short period of time whether the LED display meets the requirements of stability, reliability or life; these requirements should not be stipulated. Producers can make guarantees, but they cannot replace requirements. It is a business concept and a contractual concept, not a technical concept.

The industry should have a clear statement on this, which will be very beneficial to users, producers and the entire industry. As for how to guide users to correctly understand a complex system such as LED display, industry associations should organize more LED display technology forums, analyze this product based on reality and from the user's perspective, and guide users to correctly understand LED display.