P5 Outdoor Full Color SMD LED Module LED Display LED display four major indicators of the main performance knows how much? Since 1998, led display industry began to organize the establishment of led display industry standards, in order to correctly guide users to understand the performance...
LED display four major indicators of the main performance knows how much?
Since 1998, led display industry began to organize the establishment of led display industry standards, in order to correctly guide users to understand the performance indicators led display, standard led display market has a very important significance. The following explains the four major indicators of the led display.
1. Maximum brightness
There is no explicit characteristic requirement for the important performance of "maximum brightness". Because the use environment of LED display screens is very different, the illumination (which is what most people call the ambient brightness) is not the same. Therefore, for most complex products, as long as the corresponding test methods are specified in the standard, the supplier provides a performance data. The (product information) schedule is better than the specific performance requirements given in the standard. These are all in line with international standards, but this has also resulted in unrealistic cross-border comparisons in bidding, and users do not understand this, resulting in the "maximum brightness" required in many tenders is often much higher than the actual needs. Therefore, it is recommended that in order to guide users to correctly understand the “maximum brightness” performance indicator of the led display, the industry is required to give a guide: In some occasions, under different illumination conditions, what the brightness of the led display reaches? Can meet the requirements.
2. Main color wavelength error
The primary wavelength error index of the primary color is changed from "base color wavelength error" to "primary color primary wavelength error", which can better explain what the characteristic of the led display screen is. The dominant wavelength of the color is equivalent to the hue of the color observed by the human eye. It is a psychological quantity and is a property in which colors are distinguished from each other. And the performance requirements specified by this industry standard, literally, the user can not understand it is an indicator reflecting the color uniformity of the led display. Therefore, it is to guide the user to understand this term first, and then understand this indicator? Or first to understand and understand the led display screen from the perspective of the customer, and then to give the user understandable and easy-to-understand performance characteristics?
One of the principles of product standard formulation is the “performance principle”: “As long as possible, requirements should be expressed by performance characteristics instead of designing and describing features. This method leaves the greatest margin for technological development.” "Wavelength error" is such a design requirement. If "Color Uniformity" is used instead, there will be no LED with a defined wavelength. For users, as long as you guarantee that the color of the LED display is uniform, it is not necessary to consider that you are using it. What technological means to achieve will leave as much room as possible for technological development, which will greatly benefit the development of the industry.
3. Duty cycle
Like the "performance principle" mentioned above, "As long as possible, requirements should be expressed by performance characteristics instead of designing and describing characteristics. This method leaves the greatest margin for technological development." We believe that "duty "Compared to a purely design technology requirement, it should not be used as a performance indicator for LED display product standards; we all understand that there is a user who cares about the display's driving duty ratio. What they care about is the effect of the display screen. Rather than our technological realization; why should we create such technical barriers and limit the technological development of the industry?
4. Refresh frequency
Judging from the measurement method, it seems that the users are really ignoring the problems that they really care about. It does not take into consideration the different driver ICs, driving circuits, and methods used by various manufacturers, which makes testing difficult. For example, in the full-color bidding for the Shenzhen Stadium, testing of this indicator has brought many problems in the sample testing of experts. The "refresh rate" screen shows the reciprocal of the required time, and the display screen acts as a light source, which is the frequency of the light source's flickering. We can use a device such as "light frequency meter" to directly test the display's light source flicker frequency to reflect this indicator. We have done this test using an oscilloscope to measure the LED drive current waveform of any color to determine the “refresh rate” and measure 200 Hz in a white field; at 3 levels of gray and other low gray levels, the measured frequency is as high More than ten kilohertz, while measured with the PR-650 spectrometer; the measured light source flicker frequency is 200 Hz in both the white field and the 200, 100, and 50 gray scales.
The above points are just a brief description of the characteristics of several led display screens, there are many “working life”, “mean time between failures” and so on encountered in many tenders, and no one test method can be shorter. During the time it was confirmed whether the LED display complied with the requirements of stability, reliability or longevity; these requirements should not be stipulated. The producer can make a guarantee, but it cannot replace the requirement. It is a business concept, a contract concept, not a technical concept. The industry should have a clear statement about this, which will be very beneficial to users, producers and the entire industry.
For how to guide the user to correctly understand the led display screen of such a complex system product, or to the industry associations to engage in more led display technology forum, starting from the actual, from the perspective of the user to analyze this product, guide users to correctly understand the led display .
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