Effect of LED beads on LED display screen

Time:2018-12-21 Views:1232

LED beads, as the components with the highest cost and the largest amount of LED display, play a leading role in the quality of LED display.Today I would like to introduce to you why LED beads are the most critical components of LED display screen. How to identify the advantages and disadvantages of LED beads?

The most critical component of full-color LED display is LED lamp bead.

There are three reasons:

First, LED is the key device with the largest number of use in the whole full-color screen machine. Thousands to tens of thousands of LED will be used per square meter.

Second, LED is the main body that determines the optical display performance of the whole screen, which directly affects the audience‘s evaluation of the display screen.

Third, leds account for the largest share of total screen costs, ranging from 30% to 70%.

How to distinguish LED display beads

1. Look at the solder joints.

Regular LED strip manufacturers produce LED strip is SMT patch process, with solder paste and reflow welding process production

2. FPC quality.

FPC copper coating and calendering two kinds of copper, copper foil coating copper plate is convex, a closer look can be seen from the welding plate and FPC joint

3. Check the cleanliness of LED strip surface.

If the LED strip produced by SMT process is used, its surface cleanliness is very good, and no impurities and stains can be seen

4. Look at the chip and production process of LED lamps

You can‘t tell the difference with your eyes. You should use aging equipment and detection equipment. If you put several manufacturers‘ leds on the aging device and use large current for aging for 24 hours or more, then you can measure the brightness of several manufacturers‘ leds.

What is the influence of LED beads on LED display screen

1, the Angle of view

The Angle of view of LED display depends on the Angle of view 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 have screens that require a higher vertical view.The Angle of view 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 an important determinant of screen brightness.The higher the LED brightness is, the larger the use current margin is, which is good for saving power and maintaining LED stability.Leds have different Angle values. When the chip brightness is set, the smaller the Angle, the brighter the LED, but the smaller the view Angle of the display screen.Generally, a 100-degree LED should be selected to ensure sufficient viewing Angle of the display screen.For screens with different spacing and line-of-sight, strike a balance between brightness, Angle and price.

3. Failure efficiency

Because the full-color display screen is composed of tens 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 screen.Generally speaking, according to industry experience, the failure rate of LED display screen from assembly to aging 72 hours before shipment should not be higher than 3/10000 (refers to the failure caused by LED beads themselves).

4. Anti-static ability

LED is a semiconductor device, sensitive to static electricity, easy to cause electrostatic failure, so the anti-static ability of the life of the screen is crucial.Generally speaking, the LED‘s human static mode test failure voltage should not be lower than 2000V.

5, life

The theoretical life of LED components is 100,000 hours, which is much longer than the working life of other components of LED display screen. Therefore, as long as the quality of LED components 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 components will be one of the most durable components of the whole display screen machine.

LED components account for 70% of the price of LED display screen, so LED components can determine the quality of LED display screen.China is not only the leading manufacturer of LED devices, but also the gathering place of LED display screen manufacturing.The high technical requirements of LED display are the development trend in the future. The high quality requirements of LED display are not only related to the trend of LED display manufacturers, but also related to the development of LED display device manufacturers.From the LED device gate, promote China from the LED display manufacturing power to the LED display manufacturing power transformation.

6. Attenuation characteristics

LED screen brightness will decline after working for a long time and the color of the screen is inconsistent, which is mainly caused by the brightness attenuation of LED devices.The attenuation of LED brightness will cause the brightness of the whole screen to decrease.Inconsistent brightness attenuation of red, green and blue leds will lead to inconsistent color of LED display screen, which is often referred to as the phenomenon of spent display screen.High quality LED devices can well control the brightness attenuation range.According to the standard of lighting 20mA at room temperature of 1000 hours, the red attenuation should be less than 2%, and the blue and green attenuation should be less than different angles of the whole screen will be bad.The Angle consistency of LED beads can be measured by LED Angle comprehensive tester, which is especially important for medium and high-end display screens.