Outdoor Full Color LED Display acceptance test what the focus of technical indicators. LED display is a variety of the most successful large-scale theatrical performances of stage art, LED can fully reflect the creative director to produce the effect can not be achieved by other means. For example, such as Spring Festival. Founding six years of Daqing, erected in Tiananmen Square four big screen, but also very perfect, declared to the people's confidence in China's LED industry and level. 2010 Shanghai World Expo will last six months, many of which display and application of LED products has withstood the test of hot and humid summer. Expo exhibition called China's LED industry.
Flatness
Display surface flatness to within ± 1mm in order to ensure the display image is not distorted, locally raised or recessed display viewing angle will lead to dead ends. The quality of flatness mainly by the production process.
Brightness and viewing angle
Indoor full color brightness to 800cd/m2 above, outdoor full color display brightness to 1500 cd/m2 or more, in order to ensure the normal operation of the display, otherwise it will be too low and can not see because of the brightness of the displayed image. The size of the brightness of the LED die by the quality of decisions. Viewing angle directly determines the size of the screen the number of audience, and therefore the bigger the better. The size of the viewing angle of the die package to decide.
Balance effect
Balance effect is one of the most important indicators display. Primary colors red, green and blue color science fooled ratio of 1:4.6:0.16 shown only when pure white, if the actual proportion of the white balance a little deviation deviation occurs, generally pay attention to whether there is bluish white, yellowish green phenomenon. White balance is good or bad by the display control system to determine the die reduction of color is also affected.
The reduction of color
Reduction of color refers to the display of color reduction, both the color display and playback source to maintain a high degree of color consistency, so as to ensure that the image realism.
Whether the mosaic, the phenomenon of dead
Mosaic is lit on the display appears a small four or normally black boxes, both modules necrosis, mainly used for the display quality, but off the connector. Dead point is lit on the display of a single point or normally black, mainly by the number of dead spots of the die to determine good or bad.
Color
Color is adjacent modules obvious color difference between the color of the transition in module units, which causes the color phenomenon is mainly by the control system is poor, gray level is not high, due to the lower frequency scanning.
Refresh rate
Refresh rate refers to the display screen is the display shows the number of times repeated, theoretically higher the refresh rate, the better the show, in general, civil or commercial grade display products in indoor display refresh rate greater than 180HZ, outdoor display Screen refresh rate greater than 300HZ.
Gray levels
Gray scale display is lit from the darkest to progression between technical processing, gray level is higher, richer colors, more vivid colors; screen is also more delicate, more performance rich detail. Currently the main use eight LED display processing system, namely 256 (28) levels of gray. Easy to understand from a total of 256 kinds of black to white brightness variations. Using RGB color can constitute a 256 × 256 × 256 = 16777216 colors. Commonly referred to 16 million colors. Major international brands display 10-bit processing system, namely the 1024 grayscale, RGB primary colors may constitute 1.07 billion colors.
Through the above description you are right "LED outdoor full color display which aspects of inspection and acceptance of the key technical indicators" understand it? Grayscale though is to determine the determinants of the number of colors, but the bigger the better does not mean unlimited. Because first of all the human eye resolution is limited, moreover median increase system processing system will involve video processing, storage, transmission, scanning and other aspects Lao to employ eight systems, broadcast-level products can be a 10-bit system.