LED lamp beads LED display on eight aspects

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1, viewing angle

LED display depends on the viewing angle LED lamp beads perspective. Currently most use outdoor display horizontal viewing angle 100 ° ;, vertical viewing angle 50 °; oval LED, indoor displays the selected horizontal and vertical are 120 °; SMD LED. Display on the highway because of its particularity is generally used 30 °; viewing angle circular LED enough. Some high-rise on the display for vertical viewing angle higher. Perspective and brightness mutually contradictory perspective is bound to reduce the brightness large. Select the desired viewing angle, depending on the use to decide.

2, brightness

LED brightness is an important determinant of display brightness. LED brightness higher, the greater use of the current balance of power saving, LED maintaining good stability. LED has a different angle, the brightness has been set in the chip case, the smaller the angle, the more LED lights, but the smaller viewing angle of the display. General should be chosen to ensure 100-degree LED display sufficient perspective. Different for different point spacing and line of sight of the display, you should find a balance in brightness, angle and prices.

3, loss of efficiency

Since the full-color display by the tens of thousands or even hundreds of thousands of groups of red, green, and blue LED pixels composed of dots, the failure of any color LED display will affect the overall visual effect. In general, according to industry experience in LED display will begin to assemble the failure rate of aging 72 hours before shipment should be no higher than ten thousandths (of a failure of the LED lamp itself causes).

4, anti-static capability

LED is a semiconductor device, sensitive to static electricity, static electricity can easily lead to failure, so the antistatic ability is critical to the life of the display. Generally speaking, LED body static mode test failure voltage of not less than 2000V.


5, life

Theoretical life of LED devices for 100,000 hours, LED display is much larger than the working life of other components, so long as the LED device quality assurance, appropriate operating current, PCB thermal design reasonable, strict production process display, LED display device will be whole one of the most durable machine parts.


LED devices accounted for 70% LED display prices in proportion, so that the LED device can determine the quality of the merits of the LED display. That country is the largest producer of LED devices, LED display also making gathering. Technically demanding LED display is the future trend of development, LED display high quality requirements, not only with regard to the trend of LED display manufacturers, LED display screen is also implicated in the development of the device manufacturers. From the LED device checks to promote the transformation of China from a manufacturing to a manufacturing power LED display LED display power.

6, the attenuation characteristic

LED display will appear after working long hours brightness decline and display color inconsistencies, mainly due to the brightness of the LED devices attenuation caused. LED brightness decay will cause the entire display screen brightness is reduced. Red, green and blue LED brightness decay magnitude of inconsistency will cause the LED display color inconsistencies, that is, we often say that the phenomenon of flower display. High quality LED device can be well controlled brightness decay magnitude. By 1000 hours at room temperature 20mA standard lighting, red attenuation should be less than 2%, blue, green decay should be less than 10%, so blue, so as not to be used 20mA current green LED in the display design, it is best to use only 70% to 80 % of the rated current.

In addition to the attenuation characteristics of red, green, blue LED characteristics associated itself, the use of electric current, PCB board thermal design, the display using ambient temperature etc. affect attenuation.

7, size

LED device the size of the impact of the LED display pixel distance, or a resolution. 5mm oval lamp is mainly used for more than P16 outdoor display, 3mm oval lamp is mainly used for P12.5, P12, P10 outdoor display, 3528 SMD LED is mainly used for P6, P8 of the households within the display, 2020 SMD LED is mainly used for P2, P3 and other indoor display. Under the premise of constant spacing, LED device size increases, to increase the display area to reduce the grainy, but by reducing the black area will decrease the contrast; the contrary, LED size decreases, reducing the display area, grainy increased , the black area is increased, increasing the contrast.

8, consistency

Full-color display is composed of numerous pixels of red, green and blue LED component makes up each color LED brightness, wavelength determines the consistency of the entire screen brightness uniformity, white balance, consistency, chromaticity consistency sex. Generally, display devices require manufacturers and suppliers to provide a wavelength range of 1 5nm: 1.3 brightness range of LED, these indicators can be component suppliers were graded by machine to achieve spectral separation. Voltage consistency generally not required.

Since the LED is angled, so the full-color LED display also has a directional angle, that when viewed at different angles, its brightness is incremented or decremented. Thus, the red, green and blue LED's perspective of consistency would seriously affect the consistency of different angles, white balance, directly affecting the display of video color fidelity. To do the red, green and blue LED brightness variations at different angles to match the consistency, we need to package the lens design, selection of raw materials on strict scientific design, depending on package vendor technology. Even the best white balance method to monitor the direction, if the LED angle consistency is not good, the entire screen at different angles balance effect will be bad. LED lamp Angle Consistency feature is available LED Tester angle measured for the high-end display is particularly important.

How to distinguish quality LED lamps

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Single LED white light aging board detected data, and the LED white light detected when assembled into a lamp aging data, is certainly a bit out of. The size of this difference depends on the LED electrical work and lighting design parameters, as well as ambient lighting uses.


Choose what kind of LED lamp beads

This is very important, LED lamp beads quality can be said is a very important factor. Give some examples, in the same wafer 14mil white chip segment represented, to do with ordinary epoxy primer and white glue glue packaging and packaging out of the LED lamp beads, single lights at 30 degrees in the environment, a thousands of hours later, the attenuation data for the light fades to 70%; if the class D low failure glue encapsulation, in the same aging environment, thousands of small-time decline of 45%; if the class C low attenuation glue package, in the same aging environment thousands of small-time decline of 12%; if the class B low attenuation glue package, in the same aging environment, thousands of small-time decline of 3%; if the class a low failure glue, in the same aging environment, thousands of small-time -6% decline.


In general, the thermal conductivity ordinary epoxy resin is very small, so when the lights work when the LED chip, LED chip to emit heat, heat capacity and limited ordinary epoxy resin, so when you are outside from the LED light source measure the temperature of the LED bracket when there are 45 degrees, the temperature of LED chip white light in the center is likely to exceed 80 degrees. LED nodes temperature is actually 80 degrees, then when the LED chips working in the thermostat's temperature, is very languishing, which accelerate the aging of the LED light source.


LED light source working environment temperature

According to the data when a single LED light source aging of view, LED light source is lit if there is only one job, while its environment temperature is 30 degrees, then, a single LED light source holder temperature when working no more than 45 degrees . This time, the Fengyun LED life will be over. If there are 100 LED light source illuminates the work space between them just 11.4mm case, then the temperature of the surrounding stent LED light source lamp heap may not exceed 45 degrees, but those LED lights in the middle of the heap light source may reach a high temperature of 65 degrees. This time, the LED light source is a test. So, those gathered in the middle of the LED light source, the light fades will theoretically faster, while the surrounding heap lamp LED light source, the light fades will be a little slower. However, if the LED lamp beads separated by 25mm or more, then they diverged from each other so the heat will not accumulate, and this time, the temperature of each LED lamp holder should be less than 50 degrees, it is more conducive to the normal operation of the LED.


If the LED in the work environment is relatively cold places, the average temperature throughout the year may be only about 15 degrees or less, and that the LED, the life even longer. Alternatively, when the LED work, next to a small fan blowing, which help disperse the heat, this way of life of the LED is also quite helpful. Anyway, we should know, LED is afraid of the heat, the higher the temperature, the shorter the life of the LED, the lower the temperature, the longer LED life. LED is of course ideal operating temperature between minus 5 to zero. But this is basically impossible.

LED lamp beads work electrical parameter design

According to the results, LED white light at lower drive current, the smaller the heat emission, of course, the smaller the brightness. According to the survey, design solar LED lighting circuit, LED drive current is generally only 5-10mA; the number of lamp beads with large lamps used products, such as 500 or more, or more, the drive current is generally only 10-15mA , and the general popularity of LED lighting applications drive current, only 15-18mA, rarely someone to design more than 20mA of current. The results also show that the drive current of 14mA, and added a cover unventilated inside air temperature reaches 71 degrees under the environment, low decay products, thousands of small-time decline to zero, 2000 a small decline of 3% , which indicates that this low-life white LED lamp used in such an environment has reached its maximum, and then big is it the kind of damage.


Because of aging aging plate with no cooling function, so the heat generated when the LED is not basically work conducted to go outside. It proved this experimentally. Aging board inside air temperature has reached a temperature of 101 degrees, the surface temperature of the cover plate is simply aging 53 degrees, a difference of several tens of degrees. This indicates that the design of the plastic cover has essentially no thermal cooling function. But the general lighting design are taken into account thermal cooling function. So, in conclusion, the design of the electrical parameters of the LED lamp according to the actual situation, if the thermal heat dissipation good lighting, LED drive current to increase the white light that is okay, because the LED lamp bead work produced instant heat can be exported to the outside, there is no damage to the LED, the LED is the best care. Conversely, if the thermal heat dissipation so-so lighting, it is best to have a smaller circuit design, put less heat out.