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led display in our life everywhere, it is high brightness, fast response speed, visual distance, environmental adaptability, etc., is widely used in outdoor, traffic, municipal, school and other occasions, used to play ads LED display energy saving and environmental protection, all-weather work, fully adapt to a variety of outdoor harsh environments, many people think that display can be used for a long time, in fact, it has a certain life expectancy, how long is led display life expectancy? How long is the service life of led display?

1, led display to use 10 hours a day to calculate, led display life theory is 10 years, meaning 24 hours a day to 10 years, you point 12 hours a day, can be used for 20 years, led display theoretical greenhouse under the life of the LED is 10W hours.

2, each led lamp to a set of special drive circuit, LED lamp life is generally 100,000 hours, half-life in 50,000 hours, it is with the temperature, humidity, dust and other site environment, the use of the process of maintenance is also an important factor affecting its life. lcd module panel life is generally 100,000 hours, because the backlight is generally for the LED lamp, so the life of the backlight and the life of the LED screen Comparable.

3, LED module panel life are more than 100,000 hours, because the backlight is generally LED lights, so the life of the backlight and LED screen life is comparable. Even if the use of 24 hours a day, the equivalent life theory is more than 10 years, half-life in 50,000 hours, these are theoretical values.

Remind everyone: led display can be used for how long with the use of the product environment and maintenance is closely related to the good maintenance and maintenance means is the life of the LED display system fundamental, so consumers buy LED display must have quality and service as a prerequisite.

Theoretically the size of the LED display can be unrestricted, but the reality is this:
At present, the outdoor full-colour led display by waterproof box splicing, box size is generally about 1 square metre, too large is not convenient for transportation, installation and maintenance, too small to increase production costs and purchase costs. The indoor LED display is a unit board module splicing, also used simple box.
1. Viewing visual effect
LED display is mainly human eyes to watch, and the human eye visual distance and effect is limited. Viewing distance is far, the screen is made large, viewing distance is close, the screen is made small.
For example, indoor LED display, general viewing distance of a few metres or even dozens of metres, so the decision of the indoor screen area is not large, generally within 20 square metres. For outdoor LED display, viewing distance is farther, generally dozens of metres, so the screen area will be larger, more than 30 square metres.

2. Price cost
At present, the price of full-colour LED display, the screen body are in a few thousand yuan per square metre. Others include steel structure, accessories, control cards and so on. The larger the price budget is also higher, theoretically can be infinitely large, but the price will be a shocking figure, no one can afford it.

3.Maintenance
The larger, the more difficult to maintain and manage, once the problem occurs, maintenance and investigation is also more trouble. Manpower is also a huge test.

4. Installation location environment
This indoor limitations space limitations, needless to say. For outdoor, there is not enough open space to support the screen can be large enough.
So only from the above 4 aspects, it can be seen in real life can not be done arbitrarily large, and the current largest LED screen can reach several thousand square metres, which has been considered a limit.

In modern digital display technology, LED displays have become an essential tool for many occasions, both indoors and outdoors, where they are able to display excellent visual effects. However, sometimes we find that the brightness on the LED display is not consistent, which not only affects the quality of the picture, but also may affect the audience’s understanding and acceptance of the content. So, what exactly is the reason for the inconsistent brightness of the LED display?

1.The quality of LED lamp beads is not uniform
LED lamp beads are the most basic components of the LED display, their quality directly determines the brightness and uniformity of the screen. Some low-priced LED lamp beads have uneven quality and large differences in brightness. When in use, in order to reduce costs, some manufacturers may use different brands or batches of LED lamp beads, which will easily lead to the phenomenon of inconsistent brightness.
Solution:
Choose a reliable quality LED screen supplier and explicitly request the use of LED lamp beads with stable quality. In addition, pay attention to consult the manufacturer will be in the finished LED screen factory for strict brightness correction and colour matching.

2.  The power supply stability issues
The brightness of the LED display is not only related to the quality of the LED beads, but also related to the stability of the power supply. If the output current of the power supply is not stable, then the brightness emitted by the LED lamp beads in different areas will be inconsistent. In addition, when the LED full-colour screen screen size is large, long-distance power transmission is also easy to cause voltage reduction, resulting in uneven display effect.
Solution:
Choose a stable power supply device for the LED large screen to ensure the stability of the output current. Try to reduce the power transmission distance, or use cable enhancement technology in long-distance transmission to provide stable voltage.

3. Inaccurate colour calibration
Colour calibration is a key part of ensuring the consistency of LED display brightness. An accurately calibrated screen can ensure that each pixel unit of the whole screen is consistent in brightness and colour. However, due to the production process and the transportation of the finished screen and other reasons, the colour calibration is not accurate enough may become the main reason for inconsistent brightness.
Solution:
When purchasing an LED display, explicitly ask the supplier if it has undergone rigorous colour calibration. In addition, if the screen in the process of using the phenomenon of inconsistent brightness, you can use professional colour calibration instruments to adjust.

4. Temperature effects
Temperature changes are also one of the potential causes of inconsistent brightness of the LED display. the luminous efficacy of the LED lamp beads is greatly affected by temperature, when the temperature is too high or too low, the brightness of the LED lamp beads may be inconsistent.
Solution:
Keep the working environment of the LED display at a stable temperature, and try to avoid too high or too low temperatures affecting the screen. You can set up a heat sink around the screen to ensure good heat dissipation.

To solve the problem of inconsistent brightness of LED display, we need to start from many aspects such as LED bead quality, power supply stability, colour calibration and temperature. Choose a reliable quality LED screen supplier, the use of good stability of the power supply equipment, strict colour calibration, and pay attention to maintain a suitable working environment temperature, these measures can effectively improve the consistency of the screen brightness, to achieve a better display effect.

1.LED display regularly check the firmness of the hanging joints, such as loose phenomenon, pay attention to timely adjustment, re-enforcement or update the hanging parts.
2. Regularly check the line, switch inspection, keep the switch dry, to avoid leakage, electric shock accident.
3. You can use air conditioning to dehumidify the room, place desiccant and physical moisture absorption methods to keep dry and prevent the display from moisture.
4. During the rainy season, it is recommended that the display be used at least once a week for at least 2 hours each time.
5. Moderate ventilation indoors, you can let the water vapour attached to the display evaporate quickly, reduce the humidity of the indoor environment.
6. LED display is not used for a long time, should be frequently powered maintenance debugging; if not used for a long time, and then enabled when it is likely to appear dead lights and blind spots, so often powered to light up the screen debugging is very necessary.

Full colour LED display is assembled by many accessories.
1, power supply:
The stability and performance of the power supply determines the performance of the display is good or bad, a variety of models equipped with the power supply is also a good idea. the power supply required by the LED display is calculated according to the power of the unit board, a variety of models with different needs.
2, cabinet:
Cabinet is based on the size, multiple unit boards to form a cabinet, multiple cabinets and then assembled into a screen. Cabinets are professionally built, there are simple cabinets, waterproof cabinets and die-casting cabinets.
3, module:
LED module is composed of kit, bottom shell, mask and so on, full colour LED display is composed of one LED module, that is, we now see the led big screen.
4, control system:
Control system is an important part of the display, video transmission are transmitted through the sending card, video card transmission to the full-colour LED display receiver card, and then by the receiver card will signal segmentation transmission to the HUB board: in the receiver card above the installation of an adapter board (generally also called into the HUB board), the receiver card to transfer data to the adapter board, and then the adapter board data through the row of wires transmitted to the display case of a single row or column of full-colour LED display modules Then the data on the adapter board is transmitted to the single row or single column of the full-colour LED display module of the display box through the row line, and then the data between the LED module and the LED module is also connected through the row line. For LED indoor full-colour display receiving algorithm and LED outdoor full-colour display is different, because LED indoor screen and LED outdoor screen pixel point and scanning method are different, so there is a difference in the LED receiving card. led display control, debugging is mainly related to led display control system.

Some customers bought indoor LED screen, used for a period of time, the company has activities need to be used outdoors, in order to save costs, want to use the indoor led screen in the outdoor can?

Customers who have such an idea do not know about LED screen. Can give you a definite answer, indoor LED screen to outdoor use is not realistic, the reasons are as follows:

1. Brightness limitations. Indoor LED screen brightness requirements are not high, with a dynamic scanning circuit, outdoor LED screen brightness is higher for high, is a static scanning circuit, the two hardware differences.
2. waterproof limitations. LED electronic display screen indoor screen structure requirements are not waterproof or simple waterproof treatment, while the outdoor LED screen on waterproof requirements are very high, in the production of cables and boxes and other good waterproofing treatment, so there is a difference in the structure of the box itself on the requirements.
3. Viewing distance limitations. Indoor LED screen requirements viewing distance, model is generally P3, P4, P5, P6, so the area is generally not large, within 15 square metres, while the outdoor LED screen requirements viewing distance is farther away, the model is generally P8, P10, etc., so it determines the area is larger, generally more than 30 square feet.

Summary: indoor LED screen and outdoor LED screen due to the brightness, waterproof treatment, model selection is different, resulting in the beginning of production, raw materials, accessories, boxes and other hardware is different, so it is not good to change, to change will only be more than enough, so it is recommended not to go to just change.

1, the installation environment:

Stage LED display installation environment, indoor or outdoor, installation mode, whether fixed installation or removable demolition (commonly known as rental LED display), of which fixed installation is generally lower than the removable demolition installation costs, because the mobile installation to increase the material (box air box, etc.).

2, viewing distance:

Provide stage LED display viewing distance.

3、Model specification:

Please specify the stage LED display specifications to be selected, if you are not sure, welcome to call the sales staff. Widely used in the field of stage choreography, covering the mainstream models on the market: P2.5，P2.9, P3.9 P4, P4.8, P5.95, etc., welcome to consult.

4, screen size:

Please specify the area of the stage rental LED display to be done to determine the specific length and width dimensions of the display, so that Withem can give you a detailed stage rental LED display quotation programme. If you only know the approximate area, for the stage LED display size specification model selection, you need to take into account both the display area and viewing distance.

LED display and other items, as in the use of this or that problem and precautions.

1, thermal design

LED work will heat up, high temperature will affect the decay rate and stability of LED, so the PCB board heat dissipation design, body ventilation heat dissipation design will affect the performance of LED.

2、Mixed light

The same colour with different brightness grade LED need to mix the light, or according to the discrete law design of the light insertion chart for the insertion of the light, in order to ensure that the whole screen the consistency of the brightness of each colour. This process, if there is a problem, there will be a large screen local brightness inconsistency, directly affecting the display effect of the LED screen.

3, design current value

LED nominal current of 20mA, generally recommended that its maximum current is not more than 80% of the nominal value, especially for point spacing is very small screen, due to poor heat dissipation conditions, should also reduce the current value. According to experience, due to the inconsistency of red, green and blue LED attenuation rate, targeted to reduce the current value of blue and green LEDs, in order to maintain the consistency of the white balance of the large screen after a long period of time.

4, drive circuit design

Large screen module on the driver circuit board driver IC layout will also affect the brightness of the LED. As the driver IC output current in the PCB board transmission distance is too far, will make the transmission path voltage drop is too large to affect the normal operating voltage of the LED resulting in a reduction in its brightness. We often find that the LED brightness around the large screen module is lower than the middle, is the reason. Therefore, to ensure that the brightness of the large screen – consistency, we must design a good distribution of drive circuits.

5, control the verticality of the light

For direct insertion of LEDs, over the furnace to have enough technology to ensure that the LED is perpendicular to the PCB board. Any deviation will affect the consistency of the brightness of the LED has been set up, the appearance of inconsistent brightness of the colour block.

6, false soldering control

LED large screen in the LED does not light up, there is often more than 50% probability for various types of virtual welding caused by, such as LED pin virtual welding, IC pin virtual welding, row pin row mother virtual welding. Improvement of these problems need to strictly improve the process and strengthen the quality inspection to solve. Vibration test before leaving the factory is also a good inspection method.

7, over the wave soldering temperature and time

Shall strictly control the wave soldering temperature and time over the furnace, it is recommended that: preheating temperature of 100 ℃ ℃ ± 5 ℃, the maximum does not exceed 120 ℃, the eye preheating temperature rise requires a smooth, welding temperature of 245 ℃ C ± 5 ℃, welding time is recommended to be no more than 3 seconds, over the furnace, do not vibrate or punch in the hit LED until the return to the state of room temperature. Wave soldering machine temperature parameters to be tested regularly, which is determined by the characteristics of the LED, overheating or fluctuating temperatures will directly damage the LED or cause LED quality hazards, especially for small sizes such as 3mm round and oval LED.

8, anti-static

LED large screen assembly plant should have good anti-static measures. Special anti-static ground, anti-static floor, anti-static soldering iron, anti-static table mat, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially the foot cutter) are basic requirements, and to use static electricity meter to test regularly.