Abstract: lamp beads, as the heart of the led display
screen, they have a variety of types, each with its own unique characteristics, it is the thousands of them gathered together, plus other hardware such as control panels Become a led display. Let’s follow the editor today to learn about the impact of LED lamp beads on the ! Lamp beads, as the heart of the led display screen, they have a variety of types, each with its own unique characteristics, it is the tens of thousands of them that come together together with other hardware such as control panels. touch display. Let’s follow the editor today to learn about the impact of LED lamp beads on the ! 1, viewing angle The viewing angle of the is determined by the viewing angle of the LED lamp beads. At present, most outdoor displays use horizontal viewing angles of 100°; vertical viewing angles of 50°; elliptical LEDs, and indoor displays use SMD LEDs with both horizontal and vertical angles of 120°. The display screen on the highway generally uses 30° because of its particularity; a round LED with a viewing angle is sufficient. Some high-rise display screens have higher requirements for vertical viewing angles. Viewing angle and brightness are contradictory to each other, and a large viewing angle will inevitably reduce brightness. The choice of perspective needs to be determined according to the specific purpose. 2, brightness LED brightness is an important determinant of the brightness of the display. The higher the brightness of the LED, the greater the margin for the use of current, which is good for saving power and keeping the LED stable. LEDs have different angle values. When the brightness of the chip is fixed, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display. Generally, a 100-degree LED should be selected to ensure a sufficient viewing angle of the display screen. For displays with different dot pitches and different viewing distances, a balance should be found in brightness, angle, and price. 3. Failure rate Since the full-color display is composed of tens of thousands or even hundreds of thousands of pixels composed of three 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 rate of the led display screen from the start of assembly to aging 72 hours before shipment should be no more than three ten thousandths. (Refers to the failure caused by the LED lamp beads itself) 4, antistatic ability LED is a semiconductor device, sensitive to static electricity, it is easy to cause static electricity failure, so the antistatic ability is very important to the life of the display screen. Generally speaking, the failure voltage of the human body electrostatic mode test of the LED should not be lower than 2000V. 5. Life The theoretical life of the LED device is 100,000 hours, which is much longer than the working life of other parts of the . Therefore, as long as the quality of the LED device is guaranteed, the working current is appropriate, the PCB heat dissipation design is reasonable, and the display screen production process is rigorous, the LED device will be One of the most durable parts in the entire display screen. LED devices account for 70% of the price of touch display screens, so LED devices can determine the quality of led display screens. my country is not only a major producer of LED devices, but also a gathering place for manufacturing. The high technical requirements of led displays are the future development trend. The high quality requirements of led displays are not only about the trend of led display manufacturers, but also the development of device manufacturers. From the checkpoint of LED devices, China will promote China's transformation from a large manufacturing country to a manufacturing power. 6, attenuation characteristics screen will appear brightness decline and display color inconsistency phenomenon after a long time working, mainly due to the brightness of the LED device attenuation caused. The attenuation of LED brightness will reduce the brightness of the entire screen. The inconsistency of the brightness attenuation of the red, green, and blue LEDs will cause the color of the to be inconsistent, which is the phenomenon that we often say that the display is spent. High-quality LED devices can well control the brightness attenuation range. According to the standard of 20mA lighting at room temperature for 1000 hours, red attenuation should be less than 2%, blue and green attenuation should be less than 10%, so blue and green LEDs should not use 20mA current when designing the display, preferably only 70% to 80 % Of rated current. The attenuation characteristics are not only related to the characteristics of the red, green, and blue LEDs themselves, but also the current, the heat dissipation design of the PCB board, and the ambient temperature of the display screen all have an impact on the attenuation.
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