LED screen shows key technical indicators:

     The following is an explanation LED technology indicators:
     1. Figure prime rate of pixels out of control out of control rate refers to the smallest screen imaging units (pixels) work is not normal (control) proportion. The pixels get out of control, there are two modes: first, blind spots, that is, blind spots, in the time it does not require bright light, known as blind spots; second is often bright spot, when the need is not bright but it has been lit , called often highlights. In general, the composition of pixels have 2R1G1B (2 Ke red, one green and one blue light, the following are the same reason), 1R1G1B, 2R1G, 3R6G so out of control is generally not the same a map of Surrey The red, green, and blue light at the same time all the out of control, but as long as where a lamp out of control, namely, that the pixels out of control. For simplicity, according to the various color LED screen (ie, red, green, blue) pixels respectively out of control statistics and calculation, whichever is the maximum as the rate of the screen pixels out of control. Out of control the number of total pixels full-screen ratio of the total number of pixels, known as "the rate of the entire screen pixels out of control." In addition, in order to avoid loss of control of a regional plan to focus on certain elements, namely, "the regional pixels out of control rate", that is, 100 × 100 pixels in the region, out of control pixels Pixel number and the total number of regional (ie 10000) ratio.
     2. Grayscale level is the so-called gray-scale gradation or gray refers to the brightness level of light and shade. For the digital display technology, the gray scale is to show the determinants of the number of colors. Generally speaking, the higher the gray scale, richer color display screen and the more delicate, more the performance of rich details. Gray-scale level depends primarily on the system A / D converter bits. Of course, system, video processing chip, memory and transmission systems must provide the appropriate number of bits supported by Cai Xing. LED screen, if we adopt the 8-bit processing system, that is 256 (28) level gray scale. Simple to understand is from black to white a total of 256 brightness variations. If the use of RGB primary colors constitute a 256 × 256 × 256 = 16777216 colors, that is commonly referred to as 16 trillion colors. International brands mainly uses 10-bit display processing system, that is 1024 gray scale, RGB primary colors may amount to 1.07 billion colors. Although the number of gray scale is to determine the color of the decision factors, but does not mean that the bigger the better unlimited. Because, first of the resolution of the human eye is limited, Moreover, the number of bits increase system processing would involve the system video processing, storage, transmission, scanning and other links changes in the cost of dramatic increase in price changes for the worse . Generally speaking, civil or commercial-grade products can be used 8-bit systems, broadcast-quality products in a 10-bit systems.
     3. Chromatic aberration correction due to differences in color coordinates, television video signal LED color gamut and there are differences in color gamut, resulting in the color television broadcast seems unreal. Therefore, the color coordinates of the correction is very important. Correction conversion calculations more complicated, difficult to use software complete, the product from the manufacturers point of view, even though everyone claimed to have such a color correction function, I am afraid not to do color correction.
     4. Consistency full-color LED large screen, the biggest difficulty is that consistency, or the most easily perceived defects of the audience is the consistency is not good, the screen appears a deep one shallow, commonly known as the phenomenon of mosaic is the most repugnant. Uniformity caused by bad There are many reasons, including the quality of choice of LED drive circuits, structural design and construction and so on. However, unless the light-emitting diodes used in the discrete nature of too much, or else consistency problem is the design and construction problems. Perhaps the average person watching LED outdoor billboards in question, and perhaps began to see a mosaic appearance, and perhaps very light, but not without, most people and professionals will have some differences observed.
     5. Differential brightness level brightness level identification is the human eye to distinguish the image from the most among the black to the most white luminance levels. Mentioned earlier, some very high level grayscale screen can reach 256 or even 1024. However, due to the brightness sensitivity of the human eye is limited, and can not fully identify these gray-scale levels. That is probably many neighboring levels of gray scale of the human eye looks the same. And the eyes ability to distinguish each different. For the screen, identify the level of the human eye is naturally the better, because after all, on posters displayed in the image of. Of the human eye can tell the brightness levels more, which means the greater the color space of the screen, indicating the greater the potential for rich color. Brightness levels can be identified using special software to test, generally above the screen can be up to 20 levels of even a relatively good.
     6. Number of digital processing power to get high-quality images, there must be a high-quality video signal source. For the average large-screen users can get the best signal is broadcast TV signals, DVD, VCD and so on is just household level. Therefore, the input digital signal processing to enhance image quality is indispensable. In fact we all have such an experience: Play through the selected program, the display is very satisfactory, but if it is live TV program or DVD movie screenings, it is inevitable that a variety of screen and lens, such as the night so dark screen or large area of high-brightness bright screen, when the effect is being reduced. How can a variety of images and lens are satisfied with the results? Which depend on digital signal processing, such as digital comb filter, filtering noise reduction, edge sharpening, remote prediction and compensation, chroma amendment, non-linear fixes and so forth. It is particularly worth mentioning is the scaling (SCALE) treatment are the special problems of LED large screen, up to the big screen efforts to study the industry. As the large-screen pixel is always less than the video information source, playback will face scaling problems, sampling and reproduce in the losses and deficiencies caused by aliasing, and will cause decline in image quality. How to reduce and reduce losses, need for digital signal processing technology. Digital image processing technology has made great progress, there are many results, such as large-size TV or projector in the technical achievements can be directly applied to the large screen display in the past. Digital processing system processing power embodied in the handling and processing speed of the number of bits, using high-end DSP or FPGA is an inevitable trend.
     7. Grayscale non-linear gray transform non-linear transformation refers to the gray-scale data in accordance with empirical data or a non-linear relationship between the arithmetic transform and then made available to the screen display. As the LED is a linear device, with the traditional display of different non-linear display characteristics. In order to make LED display can be met without the loss of traditional sources of information gray-scale level, usually in the LED display system will do after the gray-level data on non-linear transformation, transformation will increase the number of bits of information (to ensure no loss of gray data).
     8. Reliability and lifetime reliability of the life of the screen, whether for corporate image, or based on the activities of business models, LED screen, stable and reliable is critical. Reliability index from the mean time between failure (MTBF) and mean time to repair (MTTR) to express. MTBF 10000 hours is a very high target, in fact does not necessarily need. Many manufacturers made a big effort to improve system reliability, but how to achieve what standards, and does not provide convincing data, which also caused us difficulties in choosing LED screen, LED screens and caused the quality and price differences.