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A article lets you know how to distinguish the quality of LED display
For the LED display screens with a wide variety of prices and huge price differences on the market, consumers are very headaches. The key is not knowing how to buy a good quality display. Because each manufacturer produces different LED display price positioning, the quality requirements are different, then how to choose LED display for different price points?
LED wavelength control range
The wavelength determines whether the color is pure and the color is consistent. The method of resolution is very simple; users generally do not have professional equipment, how to distinguish with the eyes? First: the whole screen is white, the screen should be pure white, without any other noise. If you think that there is a little reddish or blued, it's a big mistake, because the color cast proves that the display material and process quality control have problems. It will become more and more serious after using it for a long time. Second: the red, green, and blue colors are printed. The color of the center wavelength is the positive blue color that we usually say. If it is darker or lighter, it proves to be a partial wavelength. If a certain color is inconsistent, it proves that the wave difference is too large, the high-quality display screen is in the range of the center wavelength, the blue-green wave difference is controlled at 3 nm, and the red wave difference is less than 5 nm.
Luminous tube perspective
The illuminating angle of view of the illuminating tube refers to the angle between the two viewing directions of the same plane and the normal direction when the brightness of the viewing direction drops to one-half of the brightness of the normal direction of the LED display screen. Divided into horizontal and vertical perspectives. Gutlong Optoelectronics Chongqing has a horizontal viewing angle of 160° and a vertical viewing angle of 120°.
Maximum brightness
The maximum brightness refers to the brightness of each of the primary colors of the LED display at the highest gray level and the highest brightness under a certain ambient illumination. In short, use the software to set the brightness of the light gun in the normal direction when the display is 255 white.
For the outdoor LED display, depending on the environment used, there will be different requirements for the maximum brightness, because in the case of strong ambient light, the brightness of the LED display is required to be higher, so that the masses can see the content displayed on the screen. Under normal circumstances, the display screen is located south to the north, and the maximum brightness requirement is lower. As long as it reaches 4000CD/m2, it can meet the requirements. The north-facing display screen requires the brightness of the whole screen to reach 7000CD/m2, facing east and west. The south-facing request is the same, because there will be a part of the time when the sun will shine directly on the LED display. Theoretically, a brightness requirement of more than 5,500 CD square meters is sufficient.
Refresh rate
Refers to the number of times the LED display shows the information displayed in seconds, in Hz. If the refresh rate is too low, the human eye will see the LED display vibrating, and a scan line will appear when shooting through the camera. Generally, the refresh rate requirement of the human eye is 300 Hz or more, that is, as long as the refresh rate exceeds 300 Hz, the LED display screen is generally not shaken when viewed by the naked eye, and if the camera is used for shooting, it is generally required according to different settings of different cameras. More than 600Hz can capture the scan line. High refresh can increase the brightness and color vividness of the display. It can be detected with a digital camera. If it is high refresh, the picture taken by the camera is very clear, there are no snowflake points and scan lines. This indicator is especially important when renting screens and TV broadcasts.
Different refresh frequency comparison
It is obtained by taking the same camera to take pictures of LED display screens with different refreshing frequencies. It can be seen from the figure that the refresh rate of the left screen meets the shooting requirements of the camera, and the screen on the right has obvious scanning lines because of the insufficient refresh rate (right) The middle black horizontal line is the scan line).
About contrast
Contrast refers to the measurement of different brightness levels between the brightest white and the darkest black in the dark and dark areas of an image. The larger the difference range is, the larger the contrast is. The smaller the difference range is, the smaller the contrast is. The effect of contrast on the visual effect is very important. Generally speaking, the contrast is larger, the image is more clear and conspicuous, and the color is more vivid and bright; while the contrast is small, the whole picture will be grayed out. In order to improve the contrast of the LED display, the use of all-black LED is currently the most effective method, which can be seen very intuitively from the following figure.
Comparison of different LED modules
The left LED module uses the traditional white light, and the right module uses the Gotton GES high-end module. The picture shows the non-lighting effect. It can be imagined that when the LED display shows light and dark contrast, the right module should Far better than the one on the left.
Circuit design part
Using hidden pin and multi-channel water-blocking technology, material fusion technology to ensure good waterproofing of the lamp point, the whole circuit is fully enclosed and protected by a full aluminum kit. The front potting is made of high quality electronic potting glue imported from Korea. The height of the lamp bead is 2.5mm, which is the highest in the industry. The thickness of the glue is 1.3mm, which is also the highest in the industry, ensuring normal operation in the working environment of -40 to double hundred limit; the protection grade is up to IP68 level immersion protection military quality, external rainwater, dust, Corrosive gases, condensation moisture, salt spray and other environmental factors have no effect on the product, and the product quality and performance are extremely reliable. It also has good fire performance.