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The influence of LED lights for LED display

by:Atop     2020-06-23
LED lamp bead as the highest cost of LED display, the dosage of the largest components, effects on the quality of the LED display plays a leading role. Today we are going to introduce you why LED lamp bead is the most key components of the LED display, how to identify the advantages and disadvantages of the LED lamp bead? Full color LED display is the most key parts of the LED lamp bead. For three reasons: first, the LED is spoken by the largest number of the key device in the full color machine, every square metre can use only a few thousand to tens of thousands of LED; Second, the LED is to determine the main body of the whole screen optical display performance, a direct impact on the audience to display; Third, the LED display screen as a proportion of the overall cost in most, ranging from 30% to 70%. How to identify LED display lamp bead quality a, the solder joints. Regular LED lamp belt manufacturer production of LED lights is to use SMT process, with 2 of the solder paste and reflow soldering process, see the quality of FPC. FPC divide into two kinds, apply copper and rolling of copper coated copper copper foil is out, scan it can see it from the joint of welded plate and FPC three, LED lights belt surface cleanliness. If the SMT process in the production of LED lights belt, its surface cleanliness is very good, can't see what impurities and dirt, see the LED lamp with chips and production technology, is can't tell the difference to the eye, with aging equipment and testing equipment, if you put a few manufacturer of LED on aging instrument with large current aging 24 hours or longer, you again to measure the LED brightness of several manufacturers, look at the LED luminous intensity attenuation, minimum damping least that quality is the best. LED lights, of which 1, the influence of the LED display of the Angle of LED display depends on the Angle of LED lamp bead. To date, most outdoor display screen choose horizontal Angle 100 °; 50 ° and vertical perspective; Elliptical LED, indoor display, choose level is 120 ° from vertical; The SMD leds. Display on the highway 30 ° is generally selected due to its particularity; Perspective of round LED is enough. Some buildings on display for vertical Angle of the demand is higher. Perspective with brightness incompatible, big Angle will inevitably reduce brightness. View selection need according to the specific purposes to decide. 2, the brightness of LED brightness is an important determinant of the display brightness. LED brightness is higher, the greater the allowance of using current, is good to save electricity, stabilizing the leds. LED value has a different point of view, in the case of chip brightness is set, the smaller the Angle, the LED is more bright, but the smaller screen view. Generally should choose 100 degrees of LED display screen enough to ensure that the point of view. In view of the different spacing and different visual display, should be in brightness, Angle and find a balance on the price. 3, failure rate due to full-color displays by tens of thousands or even hundreds of thousands of set of red, green, blue three kinds of LED pixels, any color LED display screen overall failure will affect visual result. In general, according to industry experience, at the beginning of the LED display assembly to aging failure rate of 72 hours before delivery should be no more than three over ten thousand ( Refers to the LED lamp bead itself causes of failure) 。 4 LED is a semiconductor device, antistatic ability, is sensitive to electrostatic, easily lead to static electricity failure, so the antistatic ability is very important to the life of the screen. In general, the LED pattern of human body electrostatic voltage test failure should not be less than 2000 v. 5, life LED theoretical service life of the device for 100000 hours, far more than other parts of LED display working life, so the right LED device quality guarantee, the working current, reasonable PCB thermal design, display production process is rigorous, LED display screen machine device will be in one of the most durable components. LED devices accounted for 70% of the proportion of LED display price, so the LED device can determine the merits of the LED display quality. Is the production of LED devices power in our country, but also made the LED display screen. The high technical requirements of the LED display is the future trend of development, high quality requirement of the LED display, not just about LED display manufacturers, is also involved in the development of LED display screen device manufacturers. From the LED device control, and promote China made by the LED display power to the LED display manufacturing powerhouse. 6, attenuation characteristic of LED display screen for a long time after work will be a drop in brightness and screen color is not consistent with the phenomenon, is mainly due to the attenuation of the brightness of the LED device. LED brightness attenuation will cause the whole screen brightness to reduce. Red, green, and blue LED brightness attenuation amplitude inconsistent will cause color LED display, is often said that the screen we spent. High quality LED device can effectively control brightness attenuation amplitude. By 1000 hours at room temperature light 20 ma standards, attenuation should be less than 2%, red, blue, green attenuation should be less than 10%, in blue, green LED display screen design as far as possible not to use when 20 ma current, had better use only 70% to 80% of the rated current. Attenuation characteristics in addition to the associated with red, green and blue leds itself characteristic, using current, PCB thermal design, display affect attenuation using the environment temperature, etc. 7, size of LED device the size of the influence of the LED display pixel distance, namely the resolution. More than 5 mm elliptic lamp is mainly used for P16 outdoor display, 3 mm elliptic lamp is mainly used for P12. 5, P12, P10 outdoor display screen, type 3528 SMD leds is mainly used for indoor display, P6, P8 type 2020 SMD LED is mainly used for P2, P3 etc indoor display. In the premise of same point spacing, LED device size, can increase the display area, reduce the grain feeling, but because the black area area is reduced, will reduce the contrast; On the contrary, the LED size decreases, and reduce the display area, the particles are increased, the black area area increases, increase the contrast. 8, consistency, full-color display screen is composed of thousands of red, green and blue leds of pixels, each color LED brightness, the wavelength determines the whole screen brightness consistency, the consistency of the white balance consistency, color uniformity. In general, the manufacturer of display device vendor for 5 nm wavelength range and 1:1. 3 LED brightness range, these indicators can be made of device supplier classification through the testing machine can achieve. The consistency of the voltage generally do not require. As is the Angle of the leds, the full color LED display has the same directional Angle, namely in different angles, its luminance will be increasing or decreasing. , red, green, blue three colors LED the Angle of the consistency will seriously affect the consistency of different angles white balance, directly affect the display of video color fidelity. To be red, green, blue three kinds of LED brightness changes when matching consistency in different angles, encapsulated lens design, choice of raw materials is needed in the strict scientific design, this depends on the technical level packaging suppliers. The normal direction of the white balance again good display, if the Angle of the leds consistency is not good, the whole screen different point of view of the white balance effect will be bad. The Angle of the LED lamp bead consistency features available LED Angle, a comprehensive test instrument to measure is particularly important for medium and top grade display screen.
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