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LED lamp eight display on LED effect
LED display angle depends on the perspective of LED lamp. The outdoor display most of the selection of the horizontal angle 100 degrees; and the vertical angle of 50 degrees; the elliptical led, the indoor display selection of horizontal and vertical is 120 degrees; SMD LED. The display screen on the highway because of its special nature of the general selection of 30 degrees, the angle of the circular LED is enough. Some tall buildings on the screen to a higher vertical perspective. The angle of view and the brightness are contradictory, the big angle of view will certainly reduce the brightness. The choice of the visual angle should be determined according to the specific purpose.
LED brightness is an important determinant of the brightness of the display screen. LED brightness is higher, the use of the current margin is greater, to save power consumption, to maintain the stability of LED is good. LED has a different point of view, the chip brightness has been fixed in the case, the smaller the angle, the more bright LED, but the smaller the perspective of the display screen. Generally should choose 100 degrees LED to ensure that the display screen is sufficient perspective. To find a balance point between the brightness, the angle and the price of the display screen, which is aimed at the distance between different points and different visual range.
3, loss of efficiency
The full-color screen consists of tens of thousands or even hundreds of thousands of sets of red, green and blue three kinds of LED pixels, any color led the failure will affect the display of the overall visual effect. Generally speaking, according to the experience in the industry, in the LED display begin assembling to aging for 72 hours prior to shipment of failure rate should not be higher than three ten thousandths to LED lamp itself reason caused the failure).
4, antistatic ability
LED is a semiconductor device, which is sensitive to static electricity, so it is very easy to cause the failure of static electricity, so it is very important to the life of the display screen. In general, the LED of the human body electrostatic mode test failure voltage should not be less than 2000V.
The theoretical lifetime of LED devices for 100000 hours, far greater than the working life of the other components of the LED display screen, so as long as the LED device quality assurance, suitable working current, radiating PCB design is reasonable, display production process is rigorous, LED devices will be one of the most durable components display machine.
LED devices accounted for 70% of the price of the LED display, so that the LED device can determine the quality of the LED display. China is a big country of production of LED devices, but also the LED display system to make the gathering place. LED display of high technical requirements is the future trend of development, LED high quality requirements, not only on the direction of the LED display manufacturers, but also implicated in the development of LED display device manufacturers. From LED devices to promote China from the LED display manufacturing powerhouse to the LED display manufacturing power shift.
6, attenuation characteristics
LED display will be a long time after the work of the decline in brightness and display color is not consistent phenomenon, mainly due to the brightness of the LED device caused by the attenuation caused by. LED brightness attenuation will cause the entire screen brightness lower. The color of red, green, blue LED brightness attenuation is inconsistent will result in LED display screen color is not consistent, that is, we often say that the phenomenon of the display screen. High quality LED devices are able to control the amplitude of the brightness attenuation very well. According to the 1000 hours at room temperature light 20mA standard red attenuation should be less than 2%, blue and green decay should be less than 10%, so blue, green LED in the display design try not to use the current of 20mA, it is best to use only 70% to 80% of the rated current.
Attenuation characteristics in addition to the red, green, blue LED itself characteristics related to the use of current, PCB board cooling design, display the use of environmental temperature and so on are affected by attenuation.
The size of LED device affects the pixel distance of the LED display screen, that is, the resolution. 5mm oval lamp is mainly used for p16 above outdoor display, 3mm oval lamp is mainly used for P12.5, p12, P10 outdoor displays, 3528 SMD type LED is mainly used for P6 and P8 indoor display, by the patch type LED is mainly used for P2, P3 indoor display. Under the premise of the same point spacing, LED device size increases, can increase the display area, reduce the pellet feeling, but due to a decrease in the black area, reducing the contrast; on the contrary, reduce the size of the LED, reducing the display area, the particles are increased, black area increases, an increase of contrast.
Full color display is composed of numerous red, green and blue LED pixel spell, the consistency of each color LED brightness and wavelength determines the entire screen brightness uniformity, white balance consistency, color consistency. Generally speaking, the display manufacturers require device vendors provide 5 nm wavelength range and 1:1.3 brightness range of LED, these indicators can be by supplier device through optical scanner to classification to achieve. Voltage consistency is generally not required.
Because the LED is an angle, so the full-color LED display has the same angle, namely when viewed at different angles, its brightness is incremented or decremented. In this way, the consistency of the three colors of red, green and blue LED will seriously affect the consistency of white balance in different angles, which will directly affect the fidelity of the video color of the display screen. It depends on to the level of packaging supplier of technology to do red, green and blue three LED in different angles changes in brightness matching consistency and need in the encapsulation lens design, raw material selection on strict scientific design. Normal direction of the white balance and then a good display, if the consistency of the LED angle is not good, the whole screen different angles of the white balance effect will be bad. Measured LED bulb angle consistency properties available LED angle tester, for medium and high-grade display is particularly important.