LED display quality requirements
Time:2018-01-06
Views:229
LED display quality requirements
Below are the basic quality requirements of led display:
(1) Brightness requirements
(1) Brightness requirements
Brightness is an important indicator of the quality of the display. The brightness of the display is mainly determined by the luminous intensity of the LED and the density of the arrangement of the display. Some LED displays are mounted on very high exterior walls, and the mounting angle of the LED screens also affects the lighting intensity of the human eye. The brightness of the LED display defines the intensity of light per unit area of the screen in the general specification of the display.
(2) Chroma requirements
The LED display has the characteristics of color reproduction. Some manufacturers are not aware of the advantages of the wide color gamut of LED displays, blindly pursuing the high brightness of the screen, which leads to the distortion of the produced LED display, the display of glare, and sometimes the information playback will make the audience uncomfortable.
Therefore, when the LED display is produced, it is necessary to evaluate its color index. If the color index can meet the corresponding requirements, the color matching is appropriate and will not cause discomfort. The temperature measurement of the color temperature and chromaticity coordinates of the center position of the full-color LED display needs to be less than 6500K, so that the color of the full-color LED display can be prevented from being too cold, and the relevant color temperature is not more than the specified range.
(3) Energy efficiency requirements
Different LED displays want to achieve the same display, and the power consumption of the screen may be different. In today‘s energy-saving emission reduction and environmental protection, the energy efficiency requirements of LED displays are also very important.
Energy efficiency evaluation LED products generally use luminous efficiency. The installation and use range of the LED display, the measurement of the illuminance of the LED display is extremely difficult, and the brightness is relatively easy. By studying the definition of brightness and luminous flux, the energy efficiency of the LED display is found, and the brightness of the LED display is multiplied by the hemispherical surface, and the calculation result is the luminous flux.
LED display screens are mostly large screens, and there may be some uneven brightness. In order to evaluate the energy efficiency of the LED display in a more objective and reasonable way, the LED is displayed in a bright state, and it is necessary to randomly select 9 different points in all directions, and the brightness of 9 points is simultaneously measured, and then the LED display is obtained. The average brightness of the screen, expressed in LAV. When measuring the brightness, measure the power consumption of the LED display, and according to the formula, the energy efficiency (in lm/W) of the LED display can be obtained.
η=πSLAV / P
Where: π represents the solid angle (sr);
S represents the light-emitting area of the display screen (m2);
LAV indicates the average brightness of the display (cd/m2);
P is the maximum power consumption (W) of the display.
(4) Environmental protection and safety requirements
Because the use of the display is often in different situations, different environments have different security requirements for the LED display. The main safety standards include: grounding, leakage current, temperature rise and medium strength. The most important of these four items is the leakage current and insulation strength requirements. The general specification of the display requires a standard 1.1 times rated power supply voltage, and the leakage current must not exceed 3.5 mA. The power switch connected to the power switch should be tolerant to 1500 v. The test will not be insulated for 1 minute.
The number of outdoor LED displays is much higher than indoors. The indoor display environment has lower requirements for adaptability, while the outdoor display is much higher than the environmental adaptability requirements. Due to the different environments installed, the outdoor display should be able to withstand the long-term effects of harsher environments, such as wind, rain, earthquakes, and to ensure normal use in high temperature and low temperature environments.
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