LED beads on the importance of LED electronic display
LED beads on the importance of LED electronic display
LED lamp beads as LED electronic display screen with the highest production, the largest amount of components. LED electronic display screen quality impact plays a leading role in the LED lamp beads, today I come to introduce you to why the LED lamp beads are the most critical components of the LED electronic display screen, how to identify the advantages and disadvantages of the LED lamp beads?
The most critical component of the LED electronic display is the LED lamp bead. There are three reasons:
First, the LED full-color screen whole machine in the largest number of key devices, each square meter will use thousands to tens of thousands of LED lamp beads;.
Second, the LED lamp beads determine the whole screen optical display performance of the main body, directly affect the audience on the display evaluation.
Third, LED electronic display screen overall cost of the largest proportion, from 30% to 70%.
How to identify the advantages and disadvantages of LED electronic display lamp beads
First, look at the solder joints. Formal LED lamp bead manufacturers produce LED lamp beads are using SMT SMD process, with solder paste and reflow soldering process production
Second, look at the quality of FPC, FPC copper and calendered copper two kinds of copper, copper-clad board is convex out of the copper foil, if you look closely from the pad and FPC connection to see out!
Third, look at the LED bead surface cleanliness. If the SMT process production of LED lamp beads, its surface cleanliness is very good, can not see what impurities and stains!
Fourth, look at the LED lights with the chip and production process, with the eyes can not see the difference between the aging equipment and testing equipment, if you put a few manufacturers of LED on the aging instrument with high-current aging for 24 hours or longer, and then go to the measurement of a few manufacturers of LED brightness to see the LED luminous intensity attenuation is minimal, attenuation of the minimum that the quality is the best.
LED beads on the LED display what is the impact of
1 Viewing angle
The angle of view of the LED electronic display is determined by the angle of view of the LED lamp beads. At present, most of the outdoor electronic display screen selection of the horizontal viewing angle of 120 °; vertical viewing angle of 50 °; elliptical LED indoor electronic display screen selection of the horizontal and vertical are 120 °; electronic display on the highway due to its special general selection of 30 °; viewing angle of the round LED is enough, some of the electronic display on the high floor of the higher requirements of the vertical viewing angle. Viewing angle and brightness are contradictory, large viewing angle will certainly reduce the brightness. The choice of viewing angle needs to be based on the specific use to decide.
2 Brightness
LED brightness is an important determinant of the brightness of the electronic display. the higher the LED brightness, the greater the margin of the use of current, to save power consumption, adhere to the LED stability has the benefit of the LED has a different angle value, the chip brightness has been determined in the case of the smaller the angle, the LED is the brighter, but the display of the viewing angle is the smaller. Generally should choose 120 degrees of LED to ensure that the display enough viewing angle. For different point spacing and different visual distance of the electronic display, should be in the brightness, angle and price to find a balance.
3 Failure rate
As the full-color electronic display screen consists of tens of thousands or even hundreds of thousands of groups of red, green and blue LED pixels, any color LED failure will affect the overall visual effect of the electronic display. Generally speaking, according to industry experience, LED electronic display screen began to assemble to aging 72 hours before shipment failure rate should not be higher than three ten thousandths (refers to the failure of the LED lamp beads caused by their own reasons)
4 anti-static ability
LED semiconductor devices, sensitive to static electricity, very easy to cause electrostatic failure, so the anti-static ability of the display life is critical. Generally speaking, LED human body electrostatic mode test failure voltage should not be less than 2000V
5 life
LED lamp bead theoretical life of 100,000 hours, much larger than the working life of other parts of the LED electronic display, so as long as the LED lamp bead quality assurance, the right working current, PCB heat dissipation design is reasonable, electronic display production process is rigorous, the LED lamp bead will be one of the most durable components in the display machine.
LED lamp beads accounted for 70% of the proportion of the price of LED electronic display so that LED lamp beads can determine the quality of LED electronic display.
6 attenuation characteristics
LED electronic display will appear after a long period of time after the decline in brightness and display color inconsistent phenomenon, mainly due to the brightness of the LED device attenuation caused by the LED brightness attenuation will cause the display screen brightness reduction. Red, green, blue LED brightness attenuation amplitude inconsistency will cause the LED display color inconsistency, is often said to display the phenomenon of flower. High-quality LED devices can well control the brightness attenuation. According to 1000 hours at room temperature light 20mA specification, red attenuation should be less than 2% blue, green attenuation should be less than 10% so blue, green LED electronic display design try not to use 20mA current, it is best to use only 70% to 80% of the rated current.
Attenuation characteristics in addition to red, green, blue LED characteristics related to their own, the use of current, PCB board thermal design, display the use of ambient temperature and so on have an impact on the attenuation.
7 size
The size of the LED beads affects the pixel distance of the LED electronic display, i.e. resolution. 3535 type SMD LEDs are mainly used for P10/P8/P6 indoor display, 2121 type SMD LEDs are mainly used for P2/P2.5/P3 indoor display. Under the premise of constant dot pitch, the LED lamp bead size increases, can increase the display area, reduce the sense of grain, however, due to the reduction of the black area, will reduce the contrast; on the contrary, the LED size is reduced, reducing the display area, the sense of grain increases, the black area increases, increasing the contrast.
8 Consistency
Full-color electronic display is composed of countless red, green, blue LED pixels spelled out each color LED brightness, wavelength consistency determines the entire display brightness consistency, white balance consistency, chromaticity consistency. Generally speaking, display manufacturers require device suppliers to provide 5nm wavelength range and 11.3 brightness range of the LED these indicators can be graded by the device supplier through the spectrophotometer to achieve the consistency of the voltage is generally not required.
Because the LED has an angle, so the full-color LED electronic display also has the angle directionality, that is, when viewed from different angles, its brightness is incremental or decremental so that the red, green, blue three colors LED angle consistency will seriously affect the consistency of the white balance of the different angles, which directly affects the fidelity of the display video color. To achieve the red, green, blue three LED different angles when the brightness of the matching consistency, need to be in the package lens design, the original material selection on the strict scientific design, which depends on the technical level of the packaging supplier. Normal direction white balance and then good display, if the LED angle consistency is not good, the whole screen of different angles of the white balance effect will be bad LED lamp bead angle consistency characteristics can be measured by the LED Angle Comprehensive Tester, for the medium and high-grade display is particularly important.
The most critical component of the LED electronic display is the LED lamp bead. There are three reasons:
First, the LED full-color screen whole machine in the largest number of key devices, each square meter will use thousands to tens of thousands of LED lamp beads;.
Second, the LED lamp beads determine the whole screen optical display performance of the main body, directly affect the audience on the display evaluation.
Third, LED electronic display screen overall cost of the largest proportion, from 30% to 70%.
How to identify the advantages and disadvantages of LED electronic display lamp beads
First, look at the solder joints. Formal LED lamp bead manufacturers produce LED lamp beads are using SMT SMD process, with solder paste and reflow soldering process production
Second, look at the quality of FPC, FPC copper and calendered copper two kinds of copper, copper-clad board is convex out of the copper foil, if you look closely from the pad and FPC connection to see out!
Third, look at the LED bead surface cleanliness. If the SMT process production of LED lamp beads, its surface cleanliness is very good, can not see what impurities and stains!
Fourth, look at the LED lights with the chip and production process, with the eyes can not see the difference between the aging equipment and testing equipment, if you put a few manufacturers of LED on the aging instrument with high-current aging for 24 hours or longer, and then go to the measurement of a few manufacturers of LED brightness to see the LED luminous intensity attenuation is minimal, attenuation of the minimum that the quality is the best.
LED beads on the LED display what is the impact of
1 Viewing angle
The angle of view of the LED electronic display is determined by the angle of view of the LED lamp beads. At present, most of the outdoor electronic display screen selection of the horizontal viewing angle of 120 °; vertical viewing angle of 50 °; elliptical LED indoor electronic display screen selection of the horizontal and vertical are 120 °; electronic display on the highway due to its special general selection of 30 °; viewing angle of the round LED is enough, some of the electronic display on the high floor of the higher requirements of the vertical viewing angle. Viewing angle and brightness are contradictory, large viewing angle will certainly reduce the brightness. The choice of viewing angle needs to be based on the specific use to decide.
2 Brightness
LED brightness is an important determinant of the brightness of the electronic display. the higher the LED brightness, the greater the margin of the use of current, to save power consumption, adhere to the LED stability has the benefit of the LED has a different angle value, the chip brightness has been determined in the case of the smaller the angle, the LED is the brighter, but the display of the viewing angle is the smaller. Generally should choose 120 degrees of LED to ensure that the display enough viewing angle. For different point spacing and different visual distance of the electronic display, should be in the brightness, angle and price to find a balance.
3 Failure rate
As the full-color electronic display screen consists of tens of thousands or even hundreds of thousands of groups of red, green and blue LED pixels, any color LED failure will affect the overall visual effect of the electronic display. Generally speaking, according to industry experience, LED electronic display screen began to assemble to aging 72 hours before shipment failure rate should not be higher than three ten thousandths (refers to the failure of the LED lamp beads caused by their own reasons)
4 anti-static ability
LED semiconductor devices, sensitive to static electricity, very easy to cause electrostatic failure, so the anti-static ability of the display life is critical. Generally speaking, LED human body electrostatic mode test failure voltage should not be less than 2000V
5 life
LED lamp bead theoretical life of 100,000 hours, much larger than the working life of other parts of the LED electronic display, so as long as the LED lamp bead quality assurance, the right working current, PCB heat dissipation design is reasonable, electronic display production process is rigorous, the LED lamp bead will be one of the most durable components in the display machine.
LED lamp beads accounted for 70% of the proportion of the price of LED electronic display so that LED lamp beads can determine the quality of LED electronic display.
6 attenuation characteristics
LED electronic display will appear after a long period of time after the decline in brightness and display color inconsistent phenomenon, mainly due to the brightness of the LED device attenuation caused by the LED brightness attenuation will cause the display screen brightness reduction. Red, green, blue LED brightness attenuation amplitude inconsistency will cause the LED display color inconsistency, is often said to display the phenomenon of flower. High-quality LED devices can well control the brightness attenuation. According to 1000 hours at room temperature light 20mA specification, red attenuation should be less than 2% blue, green attenuation should be less than 10% so blue, green LED electronic display design try not to use 20mA current, it is best to use only 70% to 80% of the rated current.
Attenuation characteristics in addition to red, green, blue LED characteristics related to their own, the use of current, PCB board thermal design, display the use of ambient temperature and so on have an impact on the attenuation.
7 size
The size of the LED beads affects the pixel distance of the LED electronic display, i.e. resolution. 3535 type SMD LEDs are mainly used for P10/P8/P6 indoor display, 2121 type SMD LEDs are mainly used for P2/P2.5/P3 indoor display. Under the premise of constant dot pitch, the LED lamp bead size increases, can increase the display area, reduce the sense of grain, however, due to the reduction of the black area, will reduce the contrast; on the contrary, the LED size is reduced, reducing the display area, the sense of grain increases, the black area increases, increasing the contrast.
8 Consistency
Full-color electronic display is composed of countless red, green, blue LED pixels spelled out each color LED brightness, wavelength consistency determines the entire display brightness consistency, white balance consistency, chromaticity consistency. Generally speaking, display manufacturers require device suppliers to provide 5nm wavelength range and 11.3 brightness range of the LED these indicators can be graded by the device supplier through the spectrophotometer to achieve the consistency of the voltage is generally not required.
Because the LED has an angle, so the full-color LED electronic display also has the angle directionality, that is, when viewed from different angles, its brightness is incremental or decremental so that the red, green, blue three colors LED angle consistency will seriously affect the consistency of the white balance of the different angles, which directly affects the fidelity of the display video color. To achieve the red, green, blue three LED different angles when the brightness of the matching consistency, need to be in the package lens design, the original material selection on the strict scientific design, which depends on the technical level of the packaging supplier. Normal direction white balance and then good display, if the LED angle consistency is not good, the whole screen of different angles of the white balance effect will be bad LED lamp bead angle consistency characteristics can be measured by the LED Angle Comprehensive Tester, for the medium and high-grade display is particularly important.