Six methods to distinguish the LED display are good or bad.indoor led display screen Vendor

　　1. Maximum brightness

　　Refers to the brightness of the LED display at the highest gray level and maximum brightness of the LED display under a certain environment. In short, the brightness measured by using a software setting display when the display screen is white 255. For the outdoor LED display according to the environment used, there will be different requirements for the maximum brightness, because in the occasion with strong environmental light, the brightness of the LED display is required to be higher, so that the people can see the content displayed on the picture clearly. Under normal circumstances, the display screen is lower to the maximum brightness requirements. As long as it meets 4000cd/m2, it can meet the requirements. The display screen in the north and south requires The requirements of the south are the same, because some of the time will be directly illuminated on the LED display. Theoretically brightness requirement is greater than 5500cd square meters brightness.

　　Two, color temperature

　　When we see the image color inconsistent or different from the material on the LED display, at this time our screen is seriously distorted, which is related to the color temperature of the white balance of the LED display. The balanced color temperature is more appropriate between 6500 and 8000K, and if it is a display used in TV station broadcast, the actual color temperature of the screen body needs to be adjusted to about 5500K, so that the screen on the display on the screen is real after recording the camera recording. of.

　　Third, refresh rate

　　The refresh rate refers to the number of times that the LED display display information is displayed per second. The refreshing frequency is too low, and the human eye watching the LED display will have a jitter. Generally, we will see the scanning line appear when using the camera. Generally, the requirements for refreshing the refreshing frequency are above 300Hz, that is, the refresh rate only needs to exceed 300Hz. Watch the LED display with the naked eye without shaking. If you use the camera to shoot, according to the different settings of different cameras, the minimum requirements are generally required. Only above 600Hz can we capture the scan line. High refreshing can improve the brightness and colorful effect of the display. It can be detected with a digital camera. If it is refreshed, the pictures taken by the camera are very clear, without snowflakes and scanning lines. This indicator is particularly important when leased screens and TV broadcasts.

　　Four, wavelength

　　The wavelength determines whether the color is pure and the color is consistent. The discrimination method is simple; if there is no professional equipment, how to distinguish it with your eyes?

　　First: The entire screen is white, and the screen should be pure white without any other miscellaneous colors. If you think it is a bit red or blue, it proves that there are problems with the display materials and process quality control. After a long time, it will become more and more serious.

　　Second: Put red, green, and blue monochrome. The color of the central wavelength is that the positive blue is red and green. If the color is deeper or lighter, it proves that the waves are partial. If a certain color is inconsistent, it proves that the wave difference is too large, and the high -quality display is within the range of the central wavelength. The blue -green wave difference is controlled at 3nm, and the red wave difference is less than 5nm.

　　5. The perspective of lighting tube

　　The lighting angle of the luminous pipe refers to the brightness of the observation direction dropped to one -half of the brightness of the LED display method line. The angle between the two observation directions and the direction of the method line of the same plane. Divided into horizontal perspective and vertical perspective.

　　For outdoor LED advertising display, the ellipse light pipe or patch luminous pipe is generally used. The elliptical lighting pipe has the characteristics of small angles and high brightness, and the vertical perspective of the lattering tube is much larger than the elliptical tube, but its brightness is less than the elliptical light tube. From the perspective of users, the lighting tube of different perspectives should be selected according to the audience of the LED display and the surrounding light environment.

　　Due to the low requirements of the indoor LED display, the audience is generally wider, so the glowing tube is the best choice. It should be noted that in order to reduce costs, some manufacturers in the market have some light pipes to reduce the cost of users, and make the brightness of the optical pipes relatively high, and the perspective is smaller than the conventional luminous pipe perspective, which will lead to the LED display screen. The front viewing is very high, but when the side is relatively large, the image is unclear.

　　In order to increase the brightness, small -sized LED chips usually use small -angle packaging. Large -sized packages do not require small angles because they do not require such high brightness. Therefore, large angle (110) high brightness and low current are the best.

　　6. Circuit design part

　　The design and materials of the circuit board have a vital role in the stability and display effect of the LED display.

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