Now in many fields, LED display will be applied. More and more people are familiar with and use LED display, so how to judge the quality of the display, so as to choose the most cost-effective products for you, which requires us in On the basis of mastering the basic technical indicators of the LED display screen, the quality level of the display screen is mainly identified from two aspects: function and performance. YONGS LED display The following is the way to identify the quality level of LED display.
1. Brightness: The level of brightness gives a very intuitive feeling, and you can tell it at a glance. Don’t think that the higher the brightness of the display, the better, it mainly depends on your use environment and viewing distance. The display screen is generally suitable at about 1000nit, the display screen for outdoor use is higher than 6000nit, and the semi-outdoor display is more suitable between 2500 and 5000nit, and the brightness of the display screen with small spacing is lower, which is about 100 to 300nit. Under the premise that the audience can see the image clearly in different environments, watching the eyes for a long time will not produce a stinging feeling.
2. Color temperature: When we see that the color of the image is inconsistent or different from the material on the display screen, then our picture is seriously distorted, which is related to the color temperature of the white balance of the display screen. The color temperature of the white balance is more suitable between 6500 and 8000K, and if it is a display screen used by TV stations, the actual color temperature of the screen needs to be adjusted to about 5500K, so that the picture on the display screen can only be recorded and broadcasted by the camera. It is true.
3. Viewing angle: For display devices, the larger the viewing angle, the better, so that the viewing range will be larger. The viewing angle of the display screen is divided into horizontal viewing angle and vertical viewing angle. At present, the horizontal viewing angle of the indoor full-color screen can be greater than 140 degrees and the vertical viewing angle is greater than 100 degrees, while the horizontal viewing angle of the outdoor full-color screen is greater than 100 degrees and the vertical viewing angle is greater than 90 degrees. On the basis that the image can be clearly and completely viewed within the viewing angle range, the phenomenon of color cast cannot occur at different viewing angles, which is mainly related to the packaging arrangement of the RGB chips of the LED lamps. Way.
4. Grayscale: When the image layer on the display screen is poor, and there is a phenomenon of pixel loss compared with the material, it means that the grayscale level of the screen is low, and the material content cannot be presented completely, clearly and truly. Its professional testing method is the gray scale test, which can intuitively see the gray level. At present, the industry can achieve a gray level of 16BIT, and it will reach 18BIT in the future.
5. Refresh rate: When the human eye directly looks at the display screen, the screen feels flickering, and when there are many horizontal dark lines when shooting with a camera or video camera, it means that the refresh rate of this screen is low. The refresh rate of the display screen should not be lower than 300Hz without affecting the direct viewing of the human eye, and to meet the requirements of cameras and video cameras, the refresh rate of the display screen should reach more than 2000Hz.
6. Contrast: When we watch the screen of the display screen, we feel that the screen is a little white, and the feeling is gray as if there is a layer of tulle attached to the surface. The contrast ratio should not be lower than 1000:1, which is mainly related to the packaging of the LED lamp and the design of the module mask. The contrast ratio of the LED lamp with a black bracket is significantly higher than that of the LED lamp with a white bracket.
