When the user make a LED Display screen project, the most important item for a LED screen display is the parameters .In many cases, some important parameters directly affect the display visual effect and quality . As below are some of the most important parameters items in detail which can make you know more clearly about the data.
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Brightness, as one of the most important parameters of LED Display, is the key to our choice of LED Display.LED brightness is typically expressed in Luminous Intensity, in CD;1000UCD =1 MCD, 1000mcd=1 CD.
The brightness of LED display screen refers to the luminous intensity per unit area of the display screen when the display screen is working normally. The unit is CD/m2 (i.e., the luminous intensity of how many CDs there are per square meter of the area).
The brightness higher for the LED display, the brighter of the image, and the sharper of the screen when looks from a distance.
The brightness of LED display is a difficult indicator to measure, but can be measured by professional tools.
Nit VS cd/m2：1nit=1cd/m2
Generally, the brightness of indoor LED display is around 1000nits at the highest, and that of outdoor LED display is around 6500nits.In some areas of direct sunlight, brightness requirements even reach 7000nits-10000nits.Ultra-high brightness LED displays usually require special SMD lamps or use of DIP lamps.
The View Angle of the LED display refers to the Angle at which the user can clearly view all the content on the screen from different directions.And the visual Angle is a reference value, LED full color display visual Angle including horizontal and vertical two indicators.Technical parameters are described as follows (visual Angle: 140°/140°);The maximum viewing Angle is 140°, and the maximum horizontal and vertical viewing Angle is 140°. if beyond 140°, the viewing effect is poor or there are blind spots.
The larger the scope of the full color LED screen can be seen by the audience, so the larger the view Angle will be better.However, the size of the view angle is mainly determined by the encapsulation method of the LED lamps, so it must be carefully considered encapsulation brand LEDS.In addition, the view Angle has a great relationship with the viewing Angle and distance, but at present, most LED display manufacturers have the same Angle. LINSN LED reminds you: if you customize the Angle according to the situation of the scene, the cost will be very high.In addition, with a same LED chip, the bigger of the Angle of LED full color screen brightness will be lower.
View distance refers to the best distance from which the user can view the LED display. In fact, it is difficult to have a specific test standard for View distance, which is related to screen brightness and installation environment such as air quality and installation height, but it is most directly related to LED pixel and screen size.The smaller the Pixel, the smaller the closest distance you can see, and the larger the Pixel, the greater the closest distance you can see.And the larger the screen, the greater the distance you can see.
Usually, View distance in LED parameter mainly describes the nearest and farthest distance that a pixel’s screen can View per square meter in the horizontal direction.For example, the View distance of P10mm is 10-100m, and the View distance of P5mm is 5-50m.
Gray scale is the so-called color scale or gray scale, which refers to the degree of brightness. Also known as half-tone (half-tone) is mainly used to transmit pictures. There are three methods of 16, 32, and 64 levels respectively. It uses matrix processing to process the pixels of the file into 16, 32, and 64 levels to make the transmission The picture is clearer. The higher the gray level of the LED display, the richer the color and the brighter the color; on the contrary, the display color is single and the change is simple.
A grayscale image is a monochrome image with 256 grayscale levels or levels from black to white. Each pixel in the image is represented by 8-bit data, so the pixel value is one of 256 gray levels between black and white. The image has only gray levels and no color changes.
Display color refers to the number of color types that the display can display. The color of our full-color LED display can reach 16.7M, which means that this display can support a maximum number of 16.7 million colors, that is, 16.7 million different colors can be displayed. “M” means million and is short for million.
Refers to the brightness that the LED screen can adjust from the lowest to the highest value, usually 0-100, can also be understood as 0%-100% of the highest brightness.
When selecting the LED display screen solution, many outdoor screens will add automatic light detection to adjust the brightness of the screen according to the changes in the sunlight environment. A good brightness value can have a better visual effect and save power consumption.
The operation power refers to the screen’s working input voltage range and the frequency of sinusoidal alternating current. This value is mainly based on the implementation standards of various countries to match the power supply. We will confirm with the customer before the trip order that the screen uses the national voltage standard, if There are special standards that require a specific power supply.
8.Maxium Power Consumption
Maximum power consumption refers to the power consumption generated by turning each LED lamps of a running LED display to white color and setting the brightness to the maximum. The photoelectric conversion efficiency of LED display is usually set at 20%-30%(estimated) in the industry, so the total power consumption can be estimated at 70% ~80%. Maximum power varies in different application scenarios, for example Outdoor full-color display is divided into energy-saving version and conventional version, energy -saving outdoor led display max power consumption is 400W/m2, conventional version is around 1000W/m2. Indoor led scren is around 700W/m2.
9. Average Power Consumption
The power consumption varies depending on the content. For example, advertising videos are rich in color, mostly white, and the average power consumption is 50% of the maximum power consumption.When playing simple graphics such as text, most of the screen is black, and the average power consumption is 10% of the maximum power consumption.According to the normal advertising statistics, the general average power consumption is 40% of the maximum power consumption.
10.Correction Scale Level
The gray level of LED display screen refers to the degree of difference in brightness.For the digital display technology, gray scale is the determinant of the number of colors.Generally speaking, the higher the gray scale, the richer the color display, the more delicate the picture is, and the more easy to show rich details
11.Frame Update Frequency
The frame updated frequency refers to the number of times the information displayed on the LED display is updated per second. Due to the visual persistence effect of the human eye, when the frame change frequency reaches a certain value, the discretely switched frame images appear to be continuous. The frame change frequency is an important indicator of the continuity of the video. Currently, LED display manufacturers generally use 60Hz or 60Hz~75Hz adaptive frame undated frequency.
12.Screen Refresh Frequency
Refresh rate refers to the image update speed on the LED screen, in other words, the number of times an image appears per second. The high quality LED displays’ refresh rate is generally over 1920Hz/s. The higher the refresh rate, the lower the flicker sense of the LED display screen, the higher the definition of the image is more stable, the lower the refresh rate, the picture may appear flicker jittery phenomenon.
Gamma correction, also called gamma nonlinearization or gamma coding, is used to perform nonlinear calculations or inverse calculations on the brightness or tristimulus values of light in the film or imaging system.Gamma correction rate is -5.0—5.0.
Composite Video, S-Video,DVI, HDMI,SDI,HD-SDI
To support these input, customers need to use a video processor. There are many video processor brand, like VDwall, Novastar, Colorlight.
The Video and S-Video input can connect with DVD,Camera. DVI input can connect with computer. HDMI input can connect with HDplayer or DVD. SDI input can connect with some other items that connect with it.
Ethernet cable 100m, optical fiber 5km.
For indoor rental LED screen, the control computer is usually near the screen. So people only need an Ethernet cable to connect the screen with the controller. But some outdoor screens will be installed far from the controller that are in the building. So people can use a fiber converter to extend the distance. There are multi-mode fiber and single mode fiber. Multi-mode fiber can extend the distance to 500M, while single mode fiber can extend the distance to 20KM.
The color of the light 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. Color temperature is only used to express the visual impression of color.
17. LED Light Color under Different Color Temperature：
1. Low color temperature：When the color temperature is below 300K, the light color is red, giving people a warm feeling; there is a steady atmosphere, warm feeling. When the low temperature light source is used, the red color will be more bright.
2. Middle color temperature：The color temperature in 300-6000K for the middle, people in this tone without particularly obvious visual psychological effect, there is a refreshing feeling; So it’s called a neutral color temperature. When using middle color temperature light source irradiation, the blue has a cool feeling.
3. High color temperature：The color temperature is more than 6000K, the light color is blue, giving people a cool feeling, when using high color temperature light source, make the object have a cold feeling.
Dot by dot, module by module, cabinet by cabinet
-20-60 Celsius degree
The internal electronic components of LED display are susceptible to the influence of working temperature. Manufacturers have certain regulations on the ambient temperature of LED display, which is generally 0~55℃. However, in order to ensure work safety and reliability, it should be considered to leave room for use, and it is best to control it below 40℃. For the natural cooling LED display screen without forced cooling, because the temperature inside the screen may be 10 ~ 15 ℃ higher than that outside the screen, countermeasures should be taken for the installation site and the heating problem inside the screen to ensure that the temperature inside the screen does not exceed the working temperature range of the LED display screen.
The ventilation and heat dissipation space around the LED display screen should be large enough. Do not install the LED display screen in the place directly exposed to sunlight. The LED display screen should have ventilation louvers. If the temperature inside the screen is too high, a fan should be installed inside the screen for forced ventilation.
The failure rate of any product in its service life is very low only under suitable working conditions. As an integrated electronic product, LED display screen is mainly composed of control panel with electronic components, switching power supply, light-emitting devices, etc., and the service life of all of them is closely related to the working temperature. If the actual working temperature exceeds the specified range of the product, not only the service life will be shortened, but also the product itself will be seriously damaged.
The overall structure of the LED display is compact, and its own heat dissipation is large, so the LED display has certain requirements for the installation environment. When the humidity is too high and the humidity changes greatly, condensation is prone to occur inside the LED display, and its insulation performance will be greatly reduced, and it may even cause a short circuit accident. In order to ensure the insulation performance of the LED display, the relative humidity of the air should be less than 85% (no condensation). If limited by the installation location, the LED display must be installed in a place with high humidity. The LED display should adopt a sealed structure. When necessary, a desiccant and heater must be added to the LED display body. If the installation site permits, air conditioning can be installed.
The use of LED displays is divided into indoor and outdoor. Whether indoor or outdoor, the service life of LED module panels is greater than 100,000 hours. Because the backlight is generally LED light, the life of the backlight is equivalent to that of the LED screen. Even if it is used 24 hours a day without interruption, the equivalent lifetime theory is more than 10 years, and the half-life is 50,000 hours. Of course, these are theoretical values! How long it can actually be used is also closely related to the environment and maintenance of the product. Therefore, the purchased LED display must have quality and service as the premise. A good installation environment and good maintenance and maintenance methods are the fundamental reasons for the life of the LED display.
Mean Time Between Failure is a measure of the reliability of a product (especially electronic products), the unit is “hour”. Specifically, it refers to the average working time between two adjacent failures, also known as the mean interval between failures. It is suitable for repairable products and also stipulates that the ratio of the cumulative working time to the number of failures during the total use phase of the product is MTBF.The determination of the MTBF value usually adopts the theoretical statistical method and the empirical statistical method. The theoretical statistical method is based on the actual conditions of the devices, components and constraints, and accumulates the averaged data. The empirical statistical method is based on the destructive records of factories or laboratories and accumulates average data.
23.Continuous Working Life
The LED display is subjected to 72-hour aging test in the factory, before delivery,so the uninterrupted working time of the LED display can definitely be more than 48 hours.but we generally do not recommend uninterrupted use for such a long time, because long-term work will reduce the life of the lamp
The Protection level, sometimes called “waterproof level”, “dust-proof level”. defines the degree of protection that mechanical and electronic equipment can provide against solid bodies and liquid penetration.
Generally, the indoor LED display protection level reaches IP45 is enough, and the outdoor LED display protection level reaches IP65 is enough.But for some harsh environments, a higher waterproof level can also be made.
|Level numeral||First place (Protection against solid bodies )||Second place (Protection against Liquid )|
|0||Unable to prevent the entry of solid bodies||unable to prevent the entry of liquid|
|1||protection against solid bodies greater than 50mm||Protection against Water dripping|
|2||protection against solid bodies greater than 12.5mm||When the LED display is tilted 15 degrees, water droplets can be protected|
|3||protection against solid bodies greater than 2.5mm||Protection against spilled water|
|4||protection against solid bodies greater than 1.0mm||Protection against water gushing out|
|5||Dust-prevention, But can not completely prevent dust from entering,and the amount of dust does not affect the normal operation of the LED display||Protection against sprayed water|
|6||Completely,Dust-prevention||Protection against strong jets of water|
|7||–||Protection against short-term flooding(1m)|
|8||–||Protection against long-term flooding,Under the fixed pressure|
The pixel out-of-control rate refers to the proportion of the smallest imaging unit (pixel) of the display that is not working properly (out of control).The pixel out of control has two modes: one is blind dot, which is not bright when it needs to be bright, which is called blind dot; the other is constant bright dot, which is always bright when it needs to be dark, which is called constant bright dot.Generally, the composition of a pixel is 1R1G1B, and out of control is generally not that the red, green, and blue lights in the same pixel are all out of control at the same time, but as long as one of the three led(red,green and blue) is out of control, we think that the pixel is out of control.For simplicity, we perform statistics and calculations of out-of-control pixels according to the primary colors of the LED display( red, green, and blue), and take the maximum value as the pixel out-of-control rate of the display.