The general appearance of the LED full color display is composed of many RGB three-color light-emitting diodes, each pixel combination has RGB diodes, and the full-color pictures of different colors are displayed by the on and off of each group of pixel lights.
The general appearance of the LED full-color display is composed of many RGB three-color light-emitting diodes, each pixel combination has RGB diodes, and the full-color pictures of different colors are displayed by the on and off of each group of pixel lights. At present, the outdoor market is still the main market for LED displays. According to industry statistics, LED outdoor displays account for 60% of the market, and they will inevitably develop into the streets and alleys in the future. If you want to understand the quality of different LED full-color display screens, you can start from the following five aspects, such as the quality and parameters of the special LED lamp beads for full-color LED display screens.
First, failure rate
Since the full-color LED display is composed of tens of thousands or even hundreds of thousands of pixels composed of three red, green, and blue LED lamp beads, the failure of any color LED lamp beads will affect the overall visual effect of the display screen. Generally speaking, according to industry experience, the failure rate between the start of assembly of the LED display and the 72-hour aging before shipment should be no more than one ten thousandth (referring to the failure caused by the LED device itself).
Second, antistatic ability
LED lamp beads are semiconductor devices, which are sensitive to static electricity and can easily cause static failure, so the antistatic ability is very important to the life of the LED display. Generally speaking, the failure voltage of the human body electrostatic mode test of LED lamp beads should not be lower than 2000V.
Third, attenuation characteristics
The red, green, and blue LED lamp beads all have the characteristics of brightness attenuation as the working time increases. The quality of LED chips, the quality of auxiliary materials and the level of packaging technology determine the attenuation speed of LED lamp beads. Generally speaking, after 1000 hours, 20 mA normal temperature lighting test, the attenuation of red LED lamp beads should be less than 10%, and the attenuation of blue and green LED lamp beads should be less than 15%. The consistency of red, green and blue attenuation is correct The white balance of the full-color LED display will have a great impact in the future, which will further affect the display fidelity of the LED display.
Fourth, brightness
The brightness of the LED lamp bead is an important determinant of the brightness of the entire screen of the LED display. The higher the brightness of the LED lamp beads, the more stable the LED lamp beads are beneficial. LED lamp beads have different angle values. When the brightness of the chip is fixed, the smaller the angle, the brighter the LED lamp beads, but the viewing angle of the LED display screen is smaller. Generally, LED lamp beads of 100 degrees -110 degrees should be selected to ensure sufficient viewing angle of the LED display. For LED displays with different dot pitches and different viewing distances, a balance should be found in brightness, angle, and price.
Fifth, consistency
The full-color LED display is made up of pixels composed of countless red, green and blue LED lamp beads. The brightness and wavelength consistency of each color LED lamp bead determines the brightness consistency and white balance of the entire LED display. Consistency and chromaticity consistency. Generally speaking, LED display manufacturers require device suppliers to provide LED lamp beads with a wavelength range of 5nm and a brightness range of 1:1.3. These indicators can be achieved by the device supplier through a spectroscopy machine. The consistency of voltage is generally not required.
Since the LED lamp beads are angled, the full-color LED display also has angular directionality, that is, when viewed from different angles, its brightness will increase or decrease. In this way, the angle consistency of the red, green, and blue LED lamp beads will seriously affect the consistency of the white balance of different angles, and directly affect the fidelity of the video color of the LED display. To achieve the matching consistency of the brightness changes of the red, green and blue LED lamp beads at different angles, it is necessary to strictly carry out scientific design in the packaging lens design and raw material selection, which depends on the packaging supplier's technical level and production The advanced nature of testing equipment. No matter how good the white balance of the LED display is, if the angle consistency of the LED lamp beads is not good, the white balance effect of the whole screen at different angles will be bad.
Through the above five points of knowledge, I believe you already know from which aspects LED lamp beads determine the quality of full-color LED display. However, LED lamp beads are not only used in full-color LED displays, but also used in lighting and large LED screens. Displays, traffic lights, decorations, computers, electronic toys and gifts, switches, telephones, advertising, urban brilliance projects and many other production areas.
