Abstract: Consistency of LED display screens is the most concern for various screen manufacturers. High-end LED screen manufacturers introduce point-by-point correction and color uniformity correction techniques to compensate for the poor consistency of LED lamps. Consistency The parameters such as brightness, wavelength, splitting ratio, eccentricity, consistency of the card point, light distribution, and viewing angle of the LED lamp are required to be strict.
Consistency of LED display screen is the most concern for all screen manufacturers. High-end LED screen manufacturers introduce point-by-point correction and color uniformity correction technology to compensate for the lack of consistency of LED lamps. Consistency The parameters such as brightness, wavelength, splitting ratio, eccentricity, consistency of the card point, light distribution, and viewing angle of the LED lamp are required to be strict.
Brightness/Wavelength/Spectral Ratio/Eccentricity/Spot Consistency
LED display brightness is one of the most important parameters, the general outdoor screen brightness needs to reach 6000nit. Ф 3mm lamp brightness parameters required for the red light> 1000mcd, green> 2000mcd, blue> 500mcd. Luminance 1:1.1 bins, viewing angle: 105±5° horizontal, 55±5° vertical. The brightness of the display of the P20 made with the above parameters is 6667 nit. For a P16 display, the brightness is up to 10000 nit.
Wavelengths need 3nm bins to ensure the screen's color consistency.
The brightness sub-file is 1:1.1. Many of the products produced by the packaging factory have multiple files and can only be shipped with 1:1.2, 1:1.3. This requires strict control of the process in order to ensure that the production of the product is distributed in the second gear, so that the 1:1.1 split ratio can be guaranteed.
The eccentricity of the Lamp346 is more difficult to control, and the high-end screen factory's requirement for eccentricity is +/-5. Whether the eccentricity and the inserting bracket are vertical, whether the spacing error between the cups of the bracket is within the permissible range, the error of the mold strip and the deviation of the die bonding position are related, and it is necessary to systematically control. In addition, the test eccentric device generally uses a remote LED 620, the device's test error is also relatively large, need to be modified to prevent the test error.
The consistency of the card point is related to whether the bracket is floating in the glue filling. It is necessary to remove all inconsistent products after pressurizing and filling in the glue.
Light shape
LED lamp light full shape and smooth curve for the LED packaging plant's pursuit. The smoother the brightness change curve means that the change in brightness is uniform and does not give the viewer a sudden change in brightness.
For example, if each tube of the display has the same light shape and the RGB relative light distribution is controlled within 10%, the display effect of the screen is extremely superior. The relative light shape between tubes is controlled at 10% in the viewing angle range.
The consistency of the red light, the consistency of the green light, the consistency of the blue light, the red, green and blue relative light distribution light are very important for the high quality display screen. When the RGB relative light distribution is within 10% in the viewing angle range, the white balance is good at all angles.
The brightness of red, green, and blue LED lights will decay as the operating time increases. The quality of LED chips, the choice of packaging materials, and the level of packaging technology determine the speed of LED decay. High-end LED displays stand the test of time. In the United States, some screen manufacturers provide a five-year warranty. This puts high demands on the attenuation of the LED lamp. Because of the short wavelength and high energy of blue light, everyone is concerned about the attenuation data of blue light. In fact, the consistency of the attenuation of red, green and blue has a great influence on the white balance of the full-color LED display in the future, and it is necessary to pay attention to the attenuation of the tubes of different colors.
The current domestic packaging plant attenuation is generally: 1000 hours, 20 mA ambient temperature lighting test, the red LED attenuation should be less than 10%, blue, green LED attenuation should be less than 15%. After the 1000-hour 30-mA room-temperature lighting test of Nichia's products, the attenuation of blue light was 0.082%, and there was almost no attenuation. In general, we all think that attenuation and chip-related, in fact, we all ignore a phenomenon: decay before and after attenuation of the blue tube, no change in leakage. Only when the leakage current value changes, it shows that there is a defect in the light-emitting chip, which is caused by the chip problem. Leakage does not change, the chip should not have attenuation. Based on several comparisons of test data, it was found that the choice of packaging material played a major role in the attenuation of blue light. Packaging plants should spend more time studying the root cause of attenuation.
Failure Rate
The full-color display consists of tens of thousands or even hundreds of thousands of pixels composed of red, green, and blue lamps. The failure of any color LED tube will affect the overall visual effect of the display. According to industry experience, the failure rate before the LED display starts to be assembled and 72 hours before aging should be no more than three ten-thousandths (failure due to the LED device itself). Warp core LED display failure standard is three hundred thousandths, which is an order of magnitude lower than that of other manufacturers. Selecting the right sealer to optimize the parameters of the bond wire to ensure that there is a total of gold, avoiding the problem of dead lights caused by the difference in thermal expansion of glue and gold wires;
In-line elliptical lamp package should pay attention to parameters such as brightness, wavelength, split ratio, viewing angle, same-color light distribution, RGB light distribution, eccentricity, and card point consistency failure rate. Stable process conditions and strict quality control systems ensure high quality products. Brightness: R>1000mcd, G>2000mcd, B>500mcd; wavelength: 3nm bin; split ratio: 1:1.1; viewing angle: horizontal direction 105±5°, vertical direction 55±5°; light distribution: relative light of the same color The strong light distribution curve is controlled within 10%, the RGB relative light intensity distribution curve is controlled within 10%, and the failure rate is less than three hundredths. If you can meet the above conditions at the same time, the use of the product and the corresponding high-standard materials produced by the LED display must have a color effect. [Editor: ltongled]
A/C and Refrigeration
Food and beverage industry
Chemical industry
Fire fighting systems
Consistency of LED display screen is the most concern for all screen manufacturers. High-end LED screen manufacturers introduce point-by-point correction and color uniformity correction technology to compensate for the lack of consistency of LED lamps. Consistency The parameters such as brightness, wavelength, splitting ratio, eccentricity, consistency of the card point, light distribution, and viewing angle of the LED lamp are required to be strict.
Brightness/Wavelength/Spectral Ratio/Eccentricity/Spot Consistency
LED display brightness is one of the most important parameters, the general outdoor screen brightness needs to reach 6000nit. Ф 3mm lamp brightness parameters required for the red light> 1000mcd, green> 2000mcd, blue> 500mcd. Luminance 1:1.1 bins, viewing angle: 105±5° horizontal, 55±5° vertical. The brightness of the display of the P20 made with the above parameters is 6667 nit. For a P16 display, the brightness is up to 10000 nit.
Wavelengths need 3nm bins to ensure the screen's color consistency.
The brightness sub-file is 1:1.1. Many of the products produced by the packaging factory have multiple files and can only be shipped with 1:1.2, 1:1.3. This requires strict control of the process in order to ensure that the production of the product is distributed in the second gear, so that the 1:1.1 split ratio can be guaranteed.
The eccentricity of the Lamp346 is more difficult to control, and the high-end screen factory's requirement for eccentricity is +/-5. Whether the eccentricity and the inserting bracket are vertical, whether the spacing error between the cups of the bracket is within the permissible range, the error of the mold strip and the deviation of the die bonding position are related, and it is necessary to systematically control. In addition, the test eccentric device generally uses a remote LED 620, the device's test error is also relatively large, need to be modified to prevent the test error.
The consistency of the card point is related to whether the bracket is floating in the glue filling. It is necessary to remove all inconsistent products after pressurizing and filling in the glue.
Light shape
LED lamp light full shape and smooth curve for the LED packaging plant's pursuit. The smoother the brightness change curve means that the change in brightness is uniform and does not give the viewer a sudden change in brightness.
For example, if each tube of the display has the same light shape and the RGB relative light distribution is controlled within 10%, the display effect of the screen is extremely superior. The relative light shape between tubes is controlled at 10% in the viewing angle range.
The consistency of the red light, the consistency of the green light, the consistency of the blue light, the red, green and blue relative light distribution light are very important for the high quality display screen. When the RGB relative light distribution is within 10% in the viewing angle range, the white balance is good at all angles.
The brightness of red, green, and blue LED lights will decay as the operating time increases. The quality of LED chips, the choice of packaging materials, and the level of packaging technology determine the speed of LED decay. High-end LED displays stand the test of time. In the United States, some screen manufacturers provide a five-year warranty. This puts high demands on the attenuation of the LED lamp. Because of the short wavelength and high energy of blue light, everyone is concerned about the attenuation data of blue light. In fact, the consistency of the attenuation of red, green and blue has a great influence on the white balance of the full-color LED display in the future, and it is necessary to pay attention to the attenuation of the tubes of different colors.
The current domestic packaging plant attenuation is generally: 1000 hours, 20 mA ambient temperature lighting test, the red LED attenuation should be less than 10%, blue, green LED attenuation should be less than 15%. After the 1000-hour 30-mA room-temperature lighting test of Nichia's products, the attenuation of blue light was 0.082%, and there was almost no attenuation. In general, we all think that attenuation and chip-related, in fact, we all ignore a phenomenon: decay before and after attenuation of the blue tube, no change in leakage. Only when the leakage current value changes, it shows that there is a defect in the light-emitting chip, which is caused by the chip problem. Leakage does not change, the chip should not have attenuation. Based on several comparisons of test data, it was found that the choice of packaging material played a major role in the attenuation of blue light. Packaging plants should spend more time studying the root cause of attenuation.
Failure Rate
The full-color display consists of tens of thousands or even hundreds of thousands of pixels composed of red, green, and blue lamps. The failure of any color LED tube will affect the overall visual effect of the display. According to industry experience, the failure rate before the LED display starts to be assembled and 72 hours before aging should be no more than three ten-thousandths (failure due to the LED device itself). Warp core LED display failure standard is three hundred thousandths, which is an order of magnitude lower than that of other manufacturers. Selecting the right sealer to optimize the parameters of the bond wire to ensure that there is a total of gold, avoiding the problem of dead lights caused by the difference in thermal expansion of glue and gold wires;
In-line elliptical lamp package should pay attention to parameters such as brightness, wavelength, split ratio, viewing angle, same-color light distribution, RGB light distribution, eccentricity, and card point consistency failure rate. Stable process conditions and strict quality control systems ensure high quality products. Brightness: R>1000mcd, G>2000mcd, B>500mcd; wavelength: 3nm bin; split ratio: 1:1.1; viewing angle: horizontal direction 105±5°, vertical direction 55±5°; light distribution: relative light of the same color The strong light distribution curve is controlled within 10%, the RGB relative light intensity distribution curve is controlled within 10%, and the failure rate is less than three hundredths. If you can meet the above conditions at the same time, the use of the product and the corresponding high-standard materials produced by the LED display must have a color effect. [Editor: ltongled]
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