LED display four major indicators of the main performance to know how much
From 1998 onwards, led display industry began to strive to organize the establishment of led display industry standards to 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 led display.
1. maximum brightness
The important performance of "maximum brightness" does not give a clear characteristic requirement. Because the use of LED display environment vary widely, the illumination (that is, the average person said the brightness of the environment) is not the same, so, for most of the complex products, as long as the standard provides the appropriate test method, the supply side to provide a performance data (Product information) list is better than the specific performance requirements given in the standard. These are in line with international standards, but this also caused the bid in the unrealistic comparisons, users do not understand this, resulting in many of the tender requirements of the "maximum brightness" is often much higher than the actual needs. Therefore, it is recommended in order to guide the user to correctly understand the led display "maximum brightness" of this performance indicators, the industry is necessary to give a guide: in some occasions, the use of different illumination environment, led display brightness to what value Can meet the requirements.
2. Primary color main wavelength error
The primary color of the primary color error index, from the "primary color wavelength error" to "primary color main wavelength error", more to show that this indicator reflects the LED display what a feature. The main wavelength of the color is equivalent to the color of the human eye to observe the color, is a psychological, color is a distinction between the property. And the industry standard requirements of the performance requirements, literally, the user is unable to understand it is to reflect the color uniformity of the led display of an indicator. Therefore, the user is to guide the first to understand the term, and then understand this indicator? Or first from the customer's point of view to understand and understand the led display, and then give the user can understand the simple and easy to understand the performance characteristics?
One of the principles of product standards is the "performance principle": "wherever possible, the requirements should be expressed by the performance characteristics, without the design and description of the characteristics of expression, this method to the development of technology to leave the greatest room." Wavelength error "is such a design requirements, if the" color uniformity "instead, there is no limit to what the wavelength of the LED.For users, as long as you ensure that the color of the led display is uniform, and do not have to consider you What technical means to achieve, to the development of technology as much as possible to leave room for such a great benefit to the development of the industry.
3. Duty cycle
As mentioned above, "the principle of performance" as long as possible, the requirements should be expressed by the performance characteristics, rather than the design and description of the characteristics of expression, this method to the development of technology left the greatest room. "We believe that" Than "purely a design technology requirements, should not be used as a standard display product performance indicators; we all understand that what users will care about the display drive duty cycle, they care about the effect of the display , Rather than our technology to achieve; why should we create this technical barriers to limit the industry's technological development?
4. Refresh frequency
From the measurement point of view, it seems to ignore the user really concerned about the problem, it is not well taken into account the manufacturers used by the driver IC, drive the circuit and the way different, resulting in difficult testing. For example, Shenzhen Stadium full color screen tender, in the expert sample test, the test of this indicator will bring a lot of problems. "Refresh frequency" a frame shows the time required for the reciprocal, the display as a light source, that is, the light source flicker frequency. We can use a similar "light frequency meter" instrument directly test the display light source flicker frequency, to reflect this indicator. We have done this test using the oscilloscope to measure any color LED drive current waveform to determine the "refresh rate" in the white field measured under 200Hz; in the 3 gray level and other low gray level, the measured frequency up to More than a few k Hz, and with the PR-650 spectrometer measurement; both in the white field, or in the 200,100,50 level gray level, the measured light source flashing frequency are 200 Hz.
The above is just a few for the characteristics of a few LED display to do a simple description, there are many bidding encountered in the "working life", "average time between failures" and so on, no one test method can be shorter Time to confirm whether the display screen in line with stability, reliability or life requirements; should not provide these requirements. Producers can make a guarantee, but can not replace the request, it is a business concept, the concept of the contract, rather than the technical concept. Industry should have a clear statement, which for users, producers and the industry will be very beneficial.
For how to guide the user to correctly understand the led display such a complex system of products, or to the industry to engage in more than led display technology forum, from the actual point of view, from the user's point of view to analyze the product, guide users to understand the correct led display