ทุกเมืองมีจอ LED ด้วยการพัฒนาเทคโนโลยีทางสังคม จอแสดงผล LED ได้ถูกรวมเข้ากับชีวิตประจำวันของเรา อุตสาหกรรมจอแสดงผล LED ได้เริ่มทำงานอย่างหนักเพื่อจัดระเบียบการจัดตั้งมาตรฐานอุตสาหกรรมจอแสดงผล LED เพื่อแนะนำให้ผู้ใช้เข้าใจตัวบ่งชี้ประสิทธิภาพของจอแสดงผล LED และควบคุมตลาดจอแสดงผล LED อย่างถูกต้อง มันมีความสำคัญมาก จอแสดงผล LED ของ YONGS อธิบายตัวบ่งชี้หลักสี่ตัวของจอแสดงผล LED
1. 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 that ordinary people call) is different. Therefore, for most complex products, as long as the corresponding test methods are specified in the standard, the supplier will provide a performance data. The (product information) list is better than the specific performance requirements given in the standard. These are all in line with international standards, but this also leads to unrealistic comparisons in bidding, and users do not understand this, so that the "maximum brightness" required in many bidding documents is often much higher than the actual need. Therefore, it is suggested that in order to guide users to correctly understand the performance index of "maximum brightness" of the LED display, it is necessary for the industry to give a guide: in some occasions, under the use environment of different illumination, what value the brightness of the LED display reaches can meet the requirements.
2. Primary color dominant wavelength error: Change the primary color dominant wavelength error index from "primary color wavelength error" to "primary color dominant wavelength error", which can better explain what characteristics this indicator reflects on the LED display. The dominant wavelength of a color is equivalent to the hue of the color observed by the human eye, which 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, it is necessary to guide users to understand the term first, and then understand this indicator. Or to first understand and understand the LED display from the customer's point of view, and then give the user-friendly and easy-to-understand performance characteristics.
3. Duty cycle: Just like the "performance principle" mentioned above, "as long as possible, the requirements should be expressed by performance characteristics rather than design and description characteristics. This method leaves the greatest room for technological development". We believe that "duty cycle" is purely a requirement of design technology and should not be used as a performance indicator of LED display product standards; we all know that any user who cares about the driving duty cycle of the display screen, they care It is the effect of the display screen, not the realization of our technology; why should we create such technical barriers by ourselves to limit the technological development of the industry?
4. Refresh frequency: From the perspective of the measurement method, it seems to ignore the real concerns of users, and it does not take into account the different driving ICs, driving circuits and methods used by various manufacturers, resulting in difficulties in testing. For example, the full-color screen bidding of Shenzhen Stadium, in the sample test of experts, the test of this indicator brings many problems. "Refresh frequency" is the reciprocal of the time required to display a frame of the screen, and the display screen is regarded as a light source, that is, the flickering frequency of the light source. We can directly test the flickering frequency of the light source of the display screen with an instrument similar to a "photosensitive 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", which is 200Hz under white field; under low gray levels such as 3-level gray, the measured frequency is as high as 200Hz. More than a dozen k Hz, and measured with a PR-650 spectrometer; the flicker frequency of the measured light source is 200 Hz no matter in the white field or in the gray level of 200, 100, and 50.
