The LED display has the highest probability of quality problems and usually occurs in the following areas:
1. Power supply: Inferior power supplies can cause the power supply to run overloaded, screen failure frequently, and even fire.
2. Lamp beads: disadvantages LED lamp beads have a short life, large heat output, large color difference, and fast decay, which seriously affect the display effect and life span of large screens.
3. PCB board: The material itself is poor, the copper coating is thin, the design is unreasonable, the poor process results in copper wire burr and other phenomena will produce a short circuit, which is the root cause of fire hazards.
4. Wire: The quality of wire rods in the market is uneven, many wire rods are copper-clad aluminum, and the appearance is like copper wire. It is actually an aluminum alloy wire; this kind of wire is generally used for temporary use and cannot be used for regular products at all. on.
When the LED display screen uses the above inferior components, it greatly reduces the screen quality and causes a series of faults and safety problems. The following are the negative examples of these LED display screens.
LED module is not flat, modular effect; LED lamp beads are of poor quality; LED dead lights too much; image mosaic is serious; water ripple is serious; image grayscale is low;
Therefore, the purchase of high quality qualified LED display is preferred. Here are some tips for selecting high quality LED displays:
1. Surface flatness: According to the conventional standard, the flatness of the surface should be within ±1mm. The purpose of this is to ensure that the display image does not distort, and that the local bulge or indentation will cause a blind angle in the viewing angle of the display screen.
2. Color Reducibility: Color is a standard that best reflects the quality of the LED display. The reducibility of the color is the reproducibility of the display, and the color of the display and the source of the display. The colors remain highly consistent, so as to ensure the image's realism.
3. Brightness: The brightness of indoor full-color LED display should be above 800cd/m2, and the brightness of outdoor LED full-color display should be above 1500cd/m2 in order to ensure the normal operation of the display. Otherwise, the brightness will be too low. The displayed image is not clear. The brightness is mainly determined by the quality of the LED die, so the quality of the LED chip is very important.
4. Viewing angle: The size of the viewing angle determines the audience of the display directly, so the bigger the better. The size of the viewing angle is mainly determined by the packaging method of the LED die.
5. The white balance effect can determine the quality of a display screen: the proportion of red, green and blue primary colors is 1:4.6:0.16. The white color will appear purely. A slight deviation appears. This kind of imbalance appears in a small amount and can be used later. This is an important factor.
6. Whether there is a mosaic or a dead point phenomenon: Mosaic refers to a light or dark four-square block that appears on the display screen. The phenomenon of necrosis is caused by the module. The main reason is that the quality of the IC or connector used in the display screen is not over. . The dead point refers to a single point that appears on the display screen, either constantly or normally. The number of dead spots is mainly determined by the quality of the die and the manufacturer's anti-static measures.
7. There are no color blocks: color blocks are adjacent to the module there is a more obvious color difference, the color of the transition to the module as a unit, causing the color block phenomenon is mainly due to poor control system, gray level is not high, The scan frequency is lower.
8. Security: The LED display is composed of multiple cabinets. Each cabinet must be protected by external grounding. The grounding resistance should be less than 0.1. And can withstand high pressure, 1500V1min does not breakdown. Marks and slogans must be warned at the high voltage input and at the high voltage connection of the power supply.
9. Packaging and transportation: The LED display is a valuable commodity and has a large weight. The packing method used by the manufacturer is very important. It is generally packaged in a single box. Each side of the box must be protected by a buffer. The box has little room for internal activities during transportation. The outer box must have a clear logo.
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