A few technical terms about LED electronic display
A few technical terms about LED electronic display
First, the maximum brightness: the end of last year's discussion of the industry “norms” for the “maximum brightness” of this important performance does not give clear characteristics of the requirements, which is in line with GB/T1.2-2002 normative guidelines for the work of the 2nd part: specification of the normative technical elements in the determination of the content of the method “5.4.3 determined by the supply side of the Values” mentioned in: if the product is allowed to exist in diversity, some of the characteristics of the product value may not have to make provisions (although these characteristics of the product's performance has a clear impact)
Because the LED electronic display screen is used in different environments, illuminance (that is, generally known as the ambient brightness) is not the same, so “for most complex products, as long as the specification of the corresponding test method, the supplier to provide a list of performance data (product information)
Better than the specifications given in the specific performance requirements “These are in line with international norms, but this also results in competitive bidding unrealistic comparison with each other, the user does not understand, resulting in many of the tender requirements of the maximum brightness” is often much higher than the actual need.
Therefore, it is recommended in order to guide the user to correctly understand a href=“http://www.jhled.cn/”> LED electronic display of the maximum brightness of this performance indicator, the industry is necessary to give a guide: certain places, different illumination under the use of the environment, the LED electronic display of the brightness of what value can meet the requirements.
Second, the base color wavelength error: the base color wavelength error indicators, from “base color wavelength error” to change to the base color wavelength error “better illustrate what this indicator reflects the LED electronic display screen of a characteristic. The main wavelength of the color is equivalent to the human eye to observe the color of the hue, a psychological amount, the color is distinguished from each other a property. And this industry specification performance requirements, literally, the user is unable to understand to reflect the LED electronic display color uniformity of an indicator. Therefore, guide the user to understand this terminology first, and then understand this indicator? Or first from the customer's point of view to recognize and understand the LED electronic display, and then give the user can understand the easy-to-understand performance characteristics? As mentioned earlier, GB/T1.2-2002 standardized guidelines for the work of the 2nd part of the specification of the normative technical elements of the content of the determination of the method of product specification on the development of one of the principles of the “performance principle,” as long as possible, the requirements should be expressed by the performance characteristics, not to use the design and description of the characteristics of the expression of the method to the Technology development leaves the most room for “base color wavelength error” is such a design requirement, if the “color uniformity” instead, there is no limit to what wavelength of the LED to the user, as long as you ensure that the color of the LED electronic display screen is Uniformity and do not have to consider what you use technical means to achieve the technical development to leave as much room as possible, so that the development of the industry is greatly beneficial.
Third, the duty cycle: as stated above the principle of performance “as long as possible, the requirements should be expressed by the performance characteristics, rather than using the design and description of the characteristics to express, this approach to the development of technology to leave the greatest possible margin,” that the duty cycle
“Purely a design technology requirements, should not be done as a LED electronic display product specification of a performance indicator; we understand very well, which users will care about the display of the drive duty cycle, depending on the effect of the display, rather than the technology to achieve; why create their own technical barriers to limit the industry's technological development?
Fourth, refresh frequency: from the “specification” measurement method, seems to ignore the user's real concern, and did not take into account the driver IC drive circuit used by various manufacturers and the way different, resulting in difficulties in testing. For example, the Shenzhen Stadium full-color screen bidding, expert sample test, the test of this indicator brings many problems. Refresh frequency” a frame display the inverse of the time required, the display as a light source, that is, the flicker frequency of the light source. Can be used similar to the “Light Sensor Frequency Meter” instrument to directly test the display of the flicker frequency of the light source to reflect this indicator. Have done this test using an oscilloscope to measure any one color LED drive current waveform to determine the “refresh frequency” measured under the white field 200HZ; 3 gray levels and other low gray levels, the measured frequency up to more than 10KHZ and measured with the PR-650 spectrometer; whether in the white field, or 200, 100, 50 levels and so on. Gray level, the measured light source flicker frequency are 200HZ
The above points are just for a few LED electronic display characteristics to make a simple description, there are many bidding encountered in the working life of the “average trouble-free time” and so on, there is no one test method can be confirmed in a relatively short period of time, whether the LED electronic display meets the requirements of stability, reliability or life; should not be stipulated in these Requirements. Producers can make a guarantee, but can not replace the requirements, a commercial concept, contractual concepts, rather than technical concepts. Industry associations should have a clear statement, which will be very favorable to users, producers and the industry as a whole.
For how to guide users to correctly understand the LED electronic display such a complex system of products, or industry associations to engage in more LED electronic display technology forums, more from a practical point of view, from the user's point of view to analyze this product, to guide users to correctly understand the LED electronic display.
Because the LED electronic display screen is used in different environments, illuminance (that is, generally known as the ambient brightness) is not the same, so “for most complex products, as long as the specification of the corresponding test method, the supplier to provide a list of performance data (product information)
Better than the specifications given in the specific performance requirements “These are in line with international norms, but this also results in competitive bidding unrealistic comparison with each other, the user does not understand, resulting in many of the tender requirements of the maximum brightness” is often much higher than the actual need.
Therefore, it is recommended in order to guide the user to correctly understand a href=“http://www.jhled.cn/”> LED electronic display of the maximum brightness of this performance indicator, the industry is necessary to give a guide: certain places, different illumination under the use of the environment, the LED electronic display of the brightness of what value can meet the requirements.
Second, the base color wavelength error: the base color wavelength error indicators, from “base color wavelength error” to change to the base color wavelength error “better illustrate what this indicator reflects the LED electronic display screen of a characteristic. The main wavelength of the color is equivalent to the human eye to observe the color of the hue, a psychological amount, the color is distinguished from each other a property. And this industry specification performance requirements, literally, the user is unable to understand to reflect the LED electronic display color uniformity of an indicator. Therefore, guide the user to understand this terminology first, and then understand this indicator? Or first from the customer's point of view to recognize and understand the LED electronic display, and then give the user can understand the easy-to-understand performance characteristics? As mentioned earlier, GB/T1.2-2002 standardized guidelines for the work of the 2nd part of the specification of the normative technical elements of the content of the determination of the method of product specification on the development of one of the principles of the “performance principle,” as long as possible, the requirements should be expressed by the performance characteristics, not to use the design and description of the characteristics of the expression of the method to the Technology development leaves the most room for “base color wavelength error” is such a design requirement, if the “color uniformity” instead, there is no limit to what wavelength of the LED to the user, as long as you ensure that the color of the LED electronic display screen is Uniformity and do not have to consider what you use technical means to achieve the technical development to leave as much room as possible, so that the development of the industry is greatly beneficial.
Third, the duty cycle: as stated above the principle of performance “as long as possible, the requirements should be expressed by the performance characteristics, rather than using the design and description of the characteristics to express, this approach to the development of technology to leave the greatest possible margin,” that the duty cycle
“Purely a design technology requirements, should not be done as a LED electronic display product specification of a performance indicator; we understand very well, which users will care about the display of the drive duty cycle, depending on the effect of the display, rather than the technology to achieve; why create their own technical barriers to limit the industry's technological development?
Fourth, refresh frequency: from the “specification” measurement method, seems to ignore the user's real concern, and did not take into account the driver IC drive circuit used by various manufacturers and the way different, resulting in difficulties in testing. For example, the Shenzhen Stadium full-color screen bidding, expert sample test, the test of this indicator brings many problems. Refresh frequency” a frame display the inverse of the time required, the display as a light source, that is, the flicker frequency of the light source. Can be used similar to the “Light Sensor Frequency Meter” instrument to directly test the display of the flicker frequency of the light source to reflect this indicator. Have done this test using an oscilloscope to measure any one color LED drive current waveform to determine the “refresh frequency” measured under the white field 200HZ; 3 gray levels and other low gray levels, the measured frequency up to more than 10KHZ and measured with the PR-650 spectrometer; whether in the white field, or 200, 100, 50 levels and so on. Gray level, the measured light source flicker frequency are 200HZ
The above points are just for a few LED electronic display characteristics to make a simple description, there are many bidding encountered in the working life of the “average trouble-free time” and so on, there is no one test method can be confirmed in a relatively short period of time, whether the LED electronic display meets the requirements of stability, reliability or life; should not be stipulated in these Requirements. Producers can make a guarantee, but can not replace the requirements, a commercial concept, contractual concepts, rather than technical concepts. Industry associations should have a clear statement, which will be very favorable to users, producers and the industry as a whole.
For how to guide users to correctly understand the LED electronic display such a complex system of products, or industry associations to engage in more LED electronic display technology forums, more from a practical point of view, from the user's point of view to analyze this product, to guide users to correctly understand the LED electronic display.