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Today, the editor will explain the four most important indicators of the mobile LED display.
There is no clear characteristic requirement for the important performance of maximum brightness in the industry standard. Because the use environment of LED display screens varies widely, and the illuminance is different (that is, the ambient brightness commonly referred to by ordinary people), so for most complex products, as long as the corresponding test methods are stipulated in the standard, the supplier provides a performance data. Product information lists are better than specific performance requirements given in standards. These are in line with international standards, but this also leads to unrealistic comparisons in bidding, and users do not understand this, resulting in the maximum brightness required in many bidding documents is often far higher than actual needs. Therefore, it is suggested that in order to guide users to correctly understand the performance index of maximum brightness of LED display screens, it is necessary for the industry to give a guide. In some occasions, under different illumination environments, the brightness of the LED display can meet the requirements.
Change the primary color dominant wavelength error indicator from primary color wavelength error to primary color dominant wavelength error, which can better explain what characteristics this indicator reflects on the LED display. The dominant wavelength of 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.
One of the principles of product standard formulation is the performance principle, which requires that performance characteristics should be expressed instead of design and description characteristics. This method leaves the greatest room for technological development. The primary wavelength error of the base color is such a design requirement, if the color uniformity instead, there is no limit to what wavelength of LED. For users, as long as you ensure that the color of the LED display is uniform, you don't have to consider what technical means you use to realize, leaving as much room for technological development as possible, which is greatly beneficial to the development of the industry.
Just like the performance principle mentioned above, the requirements should be expressed by performance characteristics instead of design and description characteristics. This method leaves the greatest room for technology development. We believe that duty cycle is purely a requirement of design technology and should not be used as a performance index of LED display product standards; everyone knows that any user will care about the driving duty cycle of the display, what they care about is the effect of the display, not our technology is realized; why should we create this kind of technical barrier by ourselves to limit the technological development of the industry?
From the point of view of the measurement method, it seems to ignore the real concern of the user, and it does not take into account the different driving ICs, driving circuits and methods used by various manufacturers, which makes the test difficult. For example, the full-color screen bidding of the Shenzhen Stadium, in the sample test of experts, the test of this indicator caused many problems. Refresh frequency is the reciprocal of the time required to display a frame of pictures. If the display is regarded as a light source, that is the flickering frequency of the light source. We can directly test the flickering frequency of the light source of the display screen with an instrument like a photosensitive frequency meter to reflect this indicator. We have done this test by using an oscilloscope to measure the LED drive current waveform of any color to determine the refresh frequency. The measured frequency is 200Hz under white field; under low gray levels such as 3 gray levels, the measured frequency is as high as The flicker frequency of the measured light source is 200 Hz no matter in the white field or in the gray scales of 200, 100, and 50.
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