The eight led large screen index of performance appraisal, the antistatic ability of led is a semiconductor device, is sensitive to electrostatic, easily lead to static electricity failure, so the antistatic ability is very important to the life of the .
In general, the LED pattern of human body electrostatic voltage test failure should not be less than 2000 v.
2, 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 LED display screen brightness is lower.
Red, green, and blue LED brightness attenuation amplitude inconsistent will cause color LED display, is we often say that the LED display screen.
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, LED display affect attenuation using the environment temperature, etc.
3, brightness lights, brightness is one of the important determinants of LED 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.
General should choose 100 degree LED to make sure that LED display enough perspective.
Aiming at different spacing and different range of , should be in brightness, Angle and find a balance on the price.
The perspective of 4, LED lamp bead, decided to the Angle of LED display.
But most of the outdoor LED display USES horizontal Angle 120 °, vertical Angle of 70 ° elliptical patch LED lamp bead, indoor LED display also choose horizontal vertical 120 ° of SMD LED lamp bead.
Highway LED display is generally selected due to its particularity of 30 ° Angle circular LED.
Some tall buildings on the LED display higher requirements for vertical Angle of view.
Perspective with brightness incompatible, big Angle will inevitably reduce brightness.
View selection need according to the specific purposes to decide.
5, failure rate due to the full color LED display
by tens of thousands or even hundreds of thousands of set of red, green, blue three kinds of LED pixels, the failure of any color leds will affect the LED display the overall visual effect.
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)
6, consistency, full-color LED display is composed of thousands of red, green, and blue LED pixel Mosaic, the consistency of each color LED brightness, the wavelength determines the brightness of the LED display consistency consistency, white balance, color consistency.
In general, the manufacturer of LED 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.
Such, red, green, blue three colors LED the Angle of the consistency will seriously affect the consistency of different angles white balance, directly affect the LED display 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.
If the Angle of the leds consistency is not good, the whole piece of the white balance effect of different perspectives on the LED display will be bad.
The Angle of the LED lamp bead consistency features available LED Angle, a comprehensive test instrument to measure for medium and high-end LED display is particularly important.
7, theory of life LED device life of 100000 hours, far more than other parts of LED display working life, so as long as the LED device quality guarantee, suitable working current, PCB thermal design is reasonable, LED display production process is rigorous, the LED devices will be LED display one of the most durable parts of the machine.
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 LED display manufacturing hub.
The high technical requirements of the LED display is the future trend of development, high quality requirement of the full color 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 full color LED display power to LED display manufacturing powerhouse.
8, 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 , 3 mm elliptic lamp is mainly used for P12.
5, P12, P10 outdoor LED display, type 3528 SMD leds is mainly used for indoor LED display, P6, P8 type 2020 SMD leds is mainly used for P2 and P3 indoor LED display, etc.
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.
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