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A brief analysis of the important factors affecting the quality of LED electronic displays

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At present, LED electronic display in the market has been widely used, whether you walk in the streets, or busy downtown can see LED electronic display figure. Although LED display has been popularized, many customers are still not familiar with LED electronic display. The following small series will introduce some quality factors of LED electronic display to you, hoping to give you a reference when choosing products.

One, the influence of temperature on the LED electronic display, full-color LED display are very critical to the ambient temperature, in theory at room temperature 25 ℃ or so, its working state is the most ideal. But in fact, outdoor LED display in the application, the complexity of the environment temperature, the highest temperature in summer could above 60 ℃, the lowest temperature in winter could under - 20 ℃. If the working efficiency and performance of LED and IC are inconsistent, the brightness will be inconsistent, and the overall display of the screen will naturally change. Under the condition of different temperatures, red, green, blue three kinds of the brightness of the light attenuation and drop is different, at 25 ℃, the white balance is normal, but at 60 ℃, the three colors of the brightness of the leds are decreased, and the attenuation values are not consistent, can produce the whole screen brightness down and slant lubricious phenomenon, and then the whole piece of the quality of the LED display will drop.

Second, the influence of the IC, IC working temperature range is in - 40 ℃ to 85 ℃. Due to ambient temperature is too high the casing temperature, if the casing temperature over 85 ℃, the IC will work because the temperature is too high and lead to instability, or between different temperature drift and produce channel current or caused by too much difference between flowers screen. Domestic LED display manufacturers are making efforts to improve the design and process, to effectively control the impact of external environment temperature on the final effect of the display, so as to make the full-color LED display perfect in various complex conditions.

Box design: good ventilation and heat dissipation design is a necessary index of box design.

4. Power supply: power supply is an important link affecting quality in LED electronic display system. Because the power supply in different temperature conditions, its working stability, output voltage value and load capacity will also be different, because it bears the role of logistics support, so its support capacity directly affects the quality of LED display. Different brand and specification power supply equipment, the price difference is very big, when we are choose and buy, cannot take a fancy to only low price and do not see its function and quality will choose.

1, the Angle of view

The perspective of LED display depends on the perspective 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; Of the patch LED. Display on the highway 30 ° is generally selected due to its particularity; Circular leds for viewing angles are enough. Some tall buildings require more vertical viewing angles than others. Visual Angle and brightness are contradictory to each other. The choice of perspective needs to be determined according to the specific purpose.

2, brightness

LED brightness is the determinant of screen brightness. The higher the LED brightness, the larger the use current allowance, which is good for saving power and keeping LED stable. Leds have different Angle values. The smaller the Angle, the brighter the LED, but the smaller the viewing Angle of the display. Generally, 100 degree LED should be selected to ensure sufficient viewing Angle of the display screen. A balance should be struck between brightness, Angle and price for displays with different spacing and line-of-sight.

3. Failure efficiency

Because the full-color display is composed of thousands or even hundreds of thousands of pixels composed of red, green and blue leds, the failure of any color LED will affect the overall visual effect of the display. Generally speaking, according to industry experience, the failure efficiency before LED display assembly to aging 72 hours before shipment should not be higher than three parts per million (refers to the LED lamp beads themselves cause failure).

4. Anti-static ability

LED is a semiconductor device, sensitive to static electricity, which can easily lead to the failure of static electricity. Therefore, the anti-static ability is very important for the life of the display screen. In general, the LED body static mode test failure voltage should not be lower than 2000V.

5, life

The theoretical life of LED device is 100,000 hours, which is much longer than the working life of other parts of LED display screen. Therefore, as long as the quality of LED device is guaranteed, the working current is appropriate, the PCB heat dissipation design is reasonable, and the production process of the display screen is rigorous, LED device is one of the most durable parts of the display screen. LED components account for 70% of the price of LED display, so LED components can determine the quality of LED display. China is not only a big manufacturer of LED components, but also a gathering place of LED screen manufacturing. The high technology requirement of LED display is the development trend in the future. The high quality requirement of LED display is not only about the trend of LED display manufacturers, but also about the development of LED display device manufacturers. From LED device check, promote China from LED display manufacturing power to LED display manufacturing power transformation.

6. Attenuation characteristics

The LED display will show the phenomenon of brightness decline and inconsistent display color after working for a long time, which is mainly caused by the brightness attenuation of LED devices. LED brightness attenuation will cause the whole screen brightness reduction. The inconsistent brightness attenuation of red, green and blue leds will lead to the inconsistent color of LED display screen, which is often called the phenomenon of screen spent. High quality LED devices can well control the brightness attenuation. According to the standard of lighting 20mA at room temperature of 1000 hours, red attenuation should be less than 2%, blue and green attenuation should be less than 10%, so blue and green LED screen 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 the red, green and blue LED characteristics, the use of current, PCB board cooling design, display use of ambient temperature, etc.

7, size

The size of LED device affects the pixel distance of LED display, that is, the resolution. The oval light of 5mm is mainly used for outdoor display screen of P16 and above, the oval light of 3mm is mainly used for outdoor display screen of P12.5, P12 and P10, the 3528 patch LED is mainly used for indoor display screen of P6 and P8, and the 5050 patch LED is mainly used for semi-outdoor display screen of P16 and P12.5. Under the premise of constant point spacing, the size of LED devices increases, which can increase the display area and reduce the particle sense. However, because of the reduction of black area, the contrast will be reduced. On the contrary, the size of LED decreases, reducing display area, increasing particle sense, increasing black area and increasing contrast.

8. Consistency

Full-color display is composed of countless red, green and blue LED pixels, each color LED brightness, wavelength consistency determines the brightness of the whole display consistency, white balance consistency, color consistency. Generally speaking, display manufacturers require device suppliers to provide LED with a wavelength range of 5nm and a brightness range of 1:1. Voltage consistency is generally not required.