Detailed explanation of led display parameters!

Publisher: Supplier of LED Display Time: 2022-09-06 18:27 Views: 573

With the continuous development of the LED display industry and more and more extensive application requirements, the function and role of the LED display cannot be ignored. There are many basic technical parameters of LED display, understanding the meaning can help you better understand the product. Let's take a look at the basic technical parameters of the LED display screen.


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1. Pixels


Pixel is the smallest light-emitting unit of the LED display, which has the same meaning as the pixel in the ordinary computer monitor. So what is the point spacing (pixel spacing)? The center distance between two adjacent pixels. The smaller the distance, the shorter the visible distance. People in the industry usually abbreviated P to represent the point spacing.


The distance from the center of one pixel to the center of another pixel. The smaller the dot pitch, the smaller the shortest viewing distance, and the closer the viewer can get to the display. Dot pitch = size / resolution corresponding to size 4. Lamp size < dot pitch Selection of dot pitch P = L / 1700 Where: P is dot pitch, unit mm L is the closest viewing distance, unit mm is P1.6 The LED display is suitable for viewing at a distance of 2.7m.


2. Pixel density


Pixel density, also known as dot density, usually refers to the number of pixels on a display per square meter.


3. Cell board specifications


Cell board size refers to the size of the cell board, usually expressed as the cell board length times the width, in millimeters. (48×244) specifications generally have P1.0, P2.0, P3.0...


Cell board resolution refers to how many pixels a cell board has, and is usually expressed by the expression of the number of rows of pixels on the cell board multiplied by the number of columns. (eg: 64×32)


3. White balance


What is white balance adjustment? What we call white balance refers to the balance of white, that is, the balance of the brightness ratio of the three RGB colors; the adjustment of the brightness ratio of the three RGB colors and the white coordinates is called white balance adjustment.


White balance effect White balance effect is one of the most important indicators of LED display. In color theory, when the ratio of red, green and blue primary colors is 1:4.6:0.16, pure white will be displayed. If the actual ratio is a little Deviation will appear white balance deviation, generally pay attention to whether the white is bluish, yellowish green phenomenon. The quality of white balance is mainly determined by the control system of the LED display.


4. Contrast


 Under a certain ambient illumination, the ratio of the maximum brightness of the LED display to the background brightness. (Highest) Contrast Under a certain ambient illumination, the ratio of the maximum brightness of the LED screen to the background brightness. High contrast represents relatively high brightness and the vividness of the color. It can be measured and calculated by professional instruments.


5. Color temperature


When the color emitted by the light source is the same as the color of the light radiated by the black body at a certain temperature, the temperature of the black body is called the color temperature of the light source. Unit: K (Kelvin) LED display color temperature adjustable: generally 3000K ~ 9500K, the factory standard 6500K can be measured by professional instruments.


Color block Color block refers to the obvious color difference between adjacent modules. The color transition is based on the module. The color block phenomenon is mainly caused by the poor control system, low gray level and low scanning frequency. .


6. Chromatic aberration


The LED display is composed of three colors of red, green and blue to produce various colors, but these three colors are made of different materials, the viewing angle is different, and the spectral distribution of different LEDs changes. These differences that can be observed are called for chromatic aberration. When the LED is observed from a certain angle, its color changes, and the ability of the human eye to judge the color of a real picture (such as a movie picture) is better than that of a computer-generated picture.


7. Perspective


The viewing angle is when the brightness in the viewing direction drops to 1/2 of the brightness of the normal to the LED display. The angle formed between the two viewing directions of the same plane and the normal direction. It is divided into horizontal and vertical viewing angles, and the viewing angle is also called half-power angle. The viewing angle is the direction in which the image content on the display is just visible, and the angle formed by the normal to the display. Viewing angle: The viewing angle of the screen when there is no obvious chromatic aberration of the LED display can be measured by professional instruments, and the viewing angle can only be judged by the naked eye. What is a good viewing angle? A good viewing angle is the angle between the normal and the direction in which the content on the display can be seen just right, without discoloration, and the image content is clear.


What is a good viewing distance? It is the vertical distance relative to the screen to be able to see all the content on the screen, no color changes, clear image content.


Viewing angle The size of the viewing angle directly determines the number of people watching the LED display. The larger the viewing angle, the better. The viewing angle is mainly determined by the packaging method of the LED chip.


8. Color


It is the basic parameter in the LED module, and different colors are used in different occasions. According to the type of color, it can be divided into two types: single-color and full-color single-point control.


Among them, a single color is a single color, and it can work when connected to the power supply. Full-color single point means that the color of each module can be controlled, and the effect of displaying pictures and videos can be achieved when the number of modules reaches a certain level. The full-color single point needs to be added to the control system to achieve the effect.


Color reducibility Color reducibility means that the color displayed on the LED display must be highly consistent with the color of the playback source, so as to ensure the realism of the image, and the LED chip has an impact on the reducibility of the color.


9. Brightness


Brightness is a more complicated problem in LEDs. The brightness we usually refer to in LED modules is usually the luminous intensity and transparency, which are generally obtained by adding the degrees related to each module. The light-emitting angle of the LED module refers to the light-emitting angle of the LED module without a lens, which is mainly determined by the LED lamp beads, and the different light-emitting angles of the LED light bead are also different. angle.


Brightness The brightness of the indoor full-color LED display should be above 800cd/㎡, and the brightness of the outdoor full-color LED display should be above 1500cd/㎡ to ensure the normal operation of the LED display, otherwise it will be difficult to see everything because the brightness is too low. displayed image. The brightness is mainly determined by the quality of the LED chip.


10. Operating temperature


The normal working temperature of LED modules is usually between -18°C and 58°C. If the required range is relatively high, special treatment should be carried out, such as adding air conditioners or exhaust fans.


11. Voltage


LED module voltage is a very important parameter in LED modules. At present, 12V low-voltage modules are relatively common. When connecting the power supply and the control system, be sure to check the correctness of the voltage value before powering on, otherwise the LED module will be damaged.


12. Dimensions


The size of the LED module usually refers to the so-called length, width and height.


13. Waterproof rating


What is the waterproof rating of LED modules? This is mainly for the outdoors, and it is an important indicator to ensure whether the LED module can work outdoors for a long time. Usually, the waterproof level should reach IP65 in the case of full open air.


14. Flatness


Flatness means that the surface flatness of the LED display should be within ±1mm to ensure that the displayed image is not distorted, and local protrusions or recesses will lead to a dead angle in the viewing angle of the LED display. The quality of flatness is mainly determined by the production process.


15. Mosaic


Mosaic refers to the small squares that are always bright or always black on the LED display, which is the phenomenon of module necrosis.


16. Dead Center Dead Center


Dead point Dead point refers to a single point that is always bright or always black on the LED display, and the number of dead points is mainly determined by the quality of the LED chip.


The above is a detailed explanation of the parameters of the led display screen compiled by the editor of Liancheng. I hope it will be helpful to you. At the same time, you are welcome to correct or add. LCF is a world-leading provider of LED display applications and solutions, as well as a national-level specialized, special, and new little giant enterprise. The main business covers "smart city", "cultural tourism business performance", "commercial display project", "content technology" four sections, with the world's leading automated production equipment and modern post-doctoral research laboratory and perfect sales and services team. Friends who want to buy LED display can also contact us, LCF  LED display manufacturer, a big country brand, trustworthy!