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Analysis of the main functions of LED display
(1) Maximum brightness
In the industry "Standards" discussed at the end of last year, there is no clear characteristic requirement for the important performance of "maximum brightness", which is in line with GB/T1.2-2002. In the "Numerical Work Guide Part 2: Determination of the Content of Normative Technical Elements in the Standard", "5.4.3 Values Determined by the Supplier" refers to: "If the product is allowed to be diversified, then certain products The characteristic values do not have to be specified (although these characteristics have a significant impact on the performance of the product).
Because the environment in which the LED display is used varies widely, the illumination (which is what the average person calls the ambient brightness) is different, so "for most complex products, a performance data is provided by the supplier as long as the corresponding test method is specified in the standard. The (product information) list is better than the specific performance requirements given in the standard." These are in line with international standards, but this also creates unrealistic comparisons in bidding, and users do not understand this, resulting in the ¡°maximum brightness¡± required in many bids is often much higher than the actual needs.
Therefore, it is recommended that in order to guide the user to correctly understand the "maximum brightness" performance of the LED display, it is necessary for the industry to give a guide: in some occasions, under the different illumination environment, what is the brightness of the LED display? Can meet the requirements.
(2) Primary color wavelength error
Changing the primary color wavelength error index from "primary color wavelength error" to "primary color dominant wavelength error" is more indicative of what this LED reflects in 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. The performance requirements set by this industry standard are literally invisible to the user as an indicator of the color uniformity of the LED display. So, is it to guide the user to understand the term first, and then understand this indicator? Or do you first understand and understand the LED display from the customer's point of view, and then give you the easy-to-understand performance characteristics that users can understand? As mentioned in the above-mentioned GB/T1.2-2002 (Standardization of the content of normative technical elements in the standardization work guide Part 2 standard), one of the principles for the formulation of product standards is the ¡°performance principle¡±: ¡°when possible Requirements should be expressed by performance characteristics, without design and description of features, this method leaves the greatest room for technological development. "Primary color primary wavelength error" is such a design requirement, because of "color uniformity" Instead, there are no LEDs that define what wavelength.
For the user, as long as you ensure that the color of the LED display is uniform, regardless of the technical means you use to achieve, to leave as much room for technology development, this is greatly beneficial to the development of the industry.
(3) duty cycle
Just like the "performance principle" mentioned above, "if possible, the requirements should be expressed by performance characteristics, without design and description of the characteristics, this method leaves the greatest room for technological development." We believe that "duty cycle" is purely a design technology requirement and should not be used as a performance indicator for LED display product standards; everyone understands that there is a user who cares about the display duty cycle of the display, they care The effect of the display is not the realization of our technology; why should we create such technical barriers and limit the technological development of the industry?
(4) Refresh frequency
From the measurement method of "Standard", it seems that the problem that the user really cares about is ignored. It also does not take into account the different driving ICs, driving circuits and methods used by various manufacturers, which makes the testing difficult. For example, the full color screen bidding of the Shenzhen Stadium, in the expert sample test, the test of this indicator brings many problems. The "refresh frequency" frame shows the reciprocal of the required time, and the display screen is used as a light source, which is the blinking frequency of the light source. We can directly test the flashing frequency of the display's light source with an instrument similar to the ¡°light-sensing frequency meter¡± 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 frequency", measured 200HZ in the white field; in the low gray level such as 3 gray scale, the measured frequency is up to More than a dozen KHZ, and measured with PR-650 spectrometer; whether in the white field, or in the gray level of 200, 100, 50, the measured source flashing frequency is 200HZ.
The above points are only a simple description of the characteristics of several LED displays, and there are many "working life", "average time between failures" encountered in bidding, etc. No one test method can be shorter. Verify that the LED display meets the requirements for stability, reliability or longevity during the time; these requirements should not be specified. The producer can make a guarantee, but it cannot replace the requirement. It is a business concept, a contract concept, not a technical concept. Industry associations should have a clear statement about this, which will be very beneficial to users, producers and the entire industry.
For products that guide users to correctly understand a complex system such as LED display, it is still necessary for industry associations to engage in LED display technology forums. It is more practical to analyze this product from the user's point of view and guide users to correctly understand LED display. .
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