What factors affect the display effect of LED display?
LED display is a flat display screen composed of light-emitting diode dot-matrix modules or pixel units. Ultra-high brightness LED can be applied to large screen display, which is mainly used in city lighting project and large screen display system due to the advantages of easy control, low-voltage DC drive, rich color performance after combination and long service life. And inLED displayThe actual use of its display effect is affected by many factors, as follows:
Factors affecting the display effect of LED display:
I. Pixel Pitch
LED display in the environment, is outdoor, semi-outdoor, or indoor, the environment is not the same, the corresponding waterproof requirements are not the same. Outdoor waterproof requirements are high, generally above IP65. According to the environment can determine the general scope of purchase is outdoor full-color display or half outdoor full-color display, or indoor full-color display.
Observation position from the distance of the installed display, that is, the visual distance, this distance is very important, it directly determines the model of the display you buy, general indoor full-color display models are divided into P1.0, P1.25, P1.53, P2, P2.5, P3, etc., the outdoor full-color display models are divided into P3, P4, P5, P6, P8, p10, etc., which are conventional, but also For example, the pixel screen, bar screen, shaped screen and other specifications and models are different, here only the conventional, the number behind the P is the distance between the lamp beads, the unit is millimeters, generally our visual distance of the very small value is equivalent to the size of the number behind the P. That is, the distance between the P10 "10 meters, this method is only a rough estimate.
Second, LED display gray level
LED display grayscale level refers to the full-color LED display single-color brightness from the darkest to the brightest can be distinguished between the number of brightness levels, the higher the grayscale level, the richer the color, the more colorful; on the contrary, the display of a single color, the change is simple. Gray level increase, can greatly enhance the color depth, make the image color display level is geometric increase. LED display, using high-quality LED lamps, gray level up to 16384 level, low brightness and high gray, the picture is more clear and vivid, the picture quality is more delicate.
Third, lamp bead quality and failure rate
LED display is made up of tens of thousands or even hundreds of thousands of groups of red, green, blue three kinds of LED lamp beads, LED lamp beads with the increase in the use of time the brightness will slowly attenuate. LED lamp beads brightness attenuation speed and LED chip, auxiliary materials, packaging process have some correlation. Generally speaking, after 1000 hours, 20 mAb room temperature lighting test, the attenuation of red LED lamp beads should be less than 7%, blue, green LED lamp beads attenuation should be less than 10%. red, green, blue attenuation of consistency of the full-color LED display later white balance has a great impact, which in turn affects the display of the display fidelity. At the same time, a good lamp bead failure rate is low, even if aging 72 hours failure rate is not higher than one ten thousandth.
IV. Stability and safety of use
LED display in operation, stability and safety is particularly important, LED display case design is very important, the components of the thermal conversion of the temperature increases, will lead to image picture quality decline. Therefore, good ventilation and heat dissipation design is an indispensable and important indicator in the box design. On the one hand, its circuit protection, on the other hand, safety, etc., as well as dustproof, waterproof role. At the same time, the supporting power supply can not just look at the low price and ignore its performance and quality, in different temperature conditions of the power supply, the stability of its work, the output voltage and load capacity will be different, because it serves as an after-sales protection role, so its safety performance directly affects the quality of the picture.
V. Screen body flatness and screen body surface reflectivity
LED display screen local convex or concave will lead to the display of the visual angle of the dead angle, the surface flatness should be within ± 1mm, in order to ensure that the display image is not distorted, LED display through the panel and the LED light-emitting tube for special process, in order to ensure that the screen surface flatness at the same time to reduce the reflectivity of the LED panel, but also improve the contrast of the display screen (the higher the contrast, the more easily the human (the higher the contrast, the easier it is for the human eye to distinguish between light and dark conversion process in the dynamic image).
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