Four key indicators of LED display performance

The display effect of the LED display is directly related to the quality control of the LED display manufacturer and the adjustment of technical parameters. So today, let's take a look at the four key indicators that affect the performance of the LED display. 1. Primary color dominant wavelength error Change the primary color dominant wavelength error index from 'primary color wavelength error' to 'primary color dominant wavelength errorThe 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. The performance requirements specified by this industry standard, literally, users cannot understand that it is an indicator that reflects the color uniformity of the LED display. Therefore, is it to guide users to understand this term first, and then to understand this indicator? Or first to understand and understand the LED display from the customer's point of view, and then give the user can understand the simple and understandable performance characteristics? Among the product standards formulation One principle is the 'performance principle': 'Whenever possible, requirements should be expressed by performance characteristics instead of design and description characteristics. This method leaves the greatest room for technological development.' This is how 'primary color dominant wavelength error' is If a design requirement is replaced by 'color uniformityYes, leave as much room as possible for technological development, which is greatly beneficial to the development of the industry. 2. Maximum brightness There is no clear characteristic requirement for the important performance of 'maximum brightness'. Because the use environment of LED display screens is very different, the illuminance (that is, the ambient brightness as ordinary people call it) is different, so for most complex products, as long as the corresponding test method is specified in the standard, the supplier will provide a performance data (Product Information) The list is better than the specific performance requirements given in the standard. These are in line with international standards, but this has resulted in 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 performance index of the 'maximum brightness' of the LED display, the industry must give a guide: in some occasions, under different illumination environments, what value the brightness of the LED display can reach Can meet the requirements. 3. From the point of view of the measurement method, the refresh frequency seems to ignore the issues that users really care about, and it does not take into account the different drive ICs, drive circuits and methods used by various manufacturers, which makes testing difficult. For example, the full-color screen bidding of the Shenzhen Stadium, in the sample test of experts, the test of this indicator has brought many problems. 'Refresh frequency' is the reciprocal of the time required for one frame of screen display, and the display screen is regarded as a luminous light source, that is, the flicker frequency of the light source. We can directly test the flicker frequency of the light source of the display screen with an instrument similar to a 'light-sensitive frequency meter' to reflect this indicator. We have done this test and used an oscilloscope to measure the LED drive current waveform of any color to determine the 'refresh frequency'. The measured frequency is 200Hz under the white field; at low gray levels such as 3-level gray, the measured frequency is as high as More than ten kHz, and measured with a PR-650 spectrometer; whether in white field or at gray levels of 200, 100, 50, etc., the flicker frequency of the measured light source is 200 Hz. 4. The duty cycle is just like the above Said 'performance principle' 'whenever possible, requirements should be expressed by performance characteristics instead of design and description characteristics. This method leaves the greatest room for technological development.' We believe that 'duty cycle' is purely A design technology requirement should not be used as a performance indicator of the LED display product standard; everyone knows that there are users who care about the driving duty cycle of the display. They care about the effect of the display, not us. The technical realization of this; why should we manufacture this kind of technical barrier by ourselves and restrict the technological development of the industry? The above points are just a simple description of the characteristics of several LED displays. There are also many 'working lifespans' encountered in bidding 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 on this, which will be very beneficial to users, producers and the entire industry. Regarding how to guide users to correctly understand LED display screens such a complex system product, LED display screen manufacturers must proceed from reality, analyze and design this product from the perspective of user experience, and guide users to correctly understand LED display screens.