What are the main LED display performance indicators:

    Starting in 1998, after five years, the LED display special committee (now the China Association for LED light display Branch) to organize the efforts, "LED display test methods" industry standard (hereinafter referred to as the "standard"), promulgated and implemented soon. To correctly guide the users to understand the performance of LED display indicators, standard LED display market has very important significance. In order to better implementation of standards and put forward the following recommendations.
A maximum brightness

     End of last year to discuss industry "standard" for the "maximum brightness" This important performance characteristics did not give a clear requirement, which is in line with the GB/T1.2-2002. In the "Standardization Guidance Part 2: technical elements of the normative standards to determine the content of method" of "5.4.3 to determine the value from the supply-side" in reference to: "If there is to allow diversification of products, then the product the value of certain characteristics may not have to make provisions for (even though these features the performance of the product has significant impact). " Because the use of LED displays differ greatly, illumination (ie, generally known as ambient light level) is not the same, so "for the most complex products, as long as the standard specified in the corresponding test method, by the supply-side performance data to provide a (Product Information) than the standard given in the list of the specific performance requirements better. " These are in line with international standards, but it also resulted in a competing bid unrealistic comparisons with each other, users have a poor understanding of, resulting in a number of tenders called for the "maximum brightness" are often much higher than the actual needs. It is therefore recommended in order to guide users to correctly understand the LED display "maximum brightness" This performance index, the industry need to give a guidance: In some occasions, the use of illumination in different environments, LED display's brightness to what the value of the to meet the requirements.

2 color dominant wavelength error

     The color dominant wavelength error of indicators, from the "color-wavelength error" changed to "color dominant wavelength error" better able to explain this indicator reflects what the characteristics of an LED display. The main color of the observed wavelength is equivalent to the human eye color hue, is a psychological quantity, is the color distinction between an attribute. The industry standard specifies performance requirements, from the face of it, the user is unable to understand that it reflects the color uniformity of LED display screen an indicator of. Therefore, is to guide the users to first find out the term, but then understand this indicator? Or the first from the perspective of customer awareness and understanding of LED display screen, and then gives the user can understand the performance characteristics of easy to understand? As mentioned earlier, GB/T1.2-2002 (Guidelines for the standardization of Part 2 of the normative standards for determining the content of technical elements approach "with regard to product standards developed by one of the principle that the" performance principle ":" as long as possible to require performance characteristics should be expressed, rather than to express the design and describe the characteristics of this approach to allow maximum room for technological development "." color dominant wavelength error "is one such design requirements, if the" color uniformity "of instead, what does not exist limited wavelength LED. For users, as long as you ensure that the color LED display is uniform, without having to consider what you are technical means to achieve, to the greatest possible technological development left room, and thus of great benefit to the development of the industry.

3 duty

     As mentioned above "performance principle" "as long as possible, the required performance characteristics should be expressed, rather than to express the design and describe the characteristics of this approach to allow maximum room for technological development." We believe that the "duty cycle" is purely a design requirement should not be used as an LED display product standards, performance indicators; we are very much aware, there is what users care about the display driver duty cycle, they care about the display effect, but not our technology; we should try to have created such a technical barriers to limit the industry's technology development?

4 Refresh Rate

     From the "standard" measurement method, it seems that ignore the real issues of concern to the user, it is not well taken into account all manufacturers used the driver IC, drive circuit and in different ways, resulting in test difficulty. For example, full-color tender stadium in Shenzhen, in the expert sample test, a test on this indicator has brought many problems. "Refresh frequency" a screen shows the reciprocal of the time required to screen as a light source, that is, the light source flicker frequency. We can use such as "light perception frequency meter," a direct test of the instrument display flicker frequency of the light source to reflect this target. We did the test in this regard the use of any oscilloscope measurement of a color LED driver