How to identify the LED screen is good or bad

1: Flatness: LED display surface roughness should be within + 1mm, in order to ensure that the display image does not distort, local convex or concave into the visual angle of the screen will lead to the emergence of dead angle. LED display manufacturers to introduce the flatness of the production process is mainly determined by the production process.

2：亮度及可视角度：室内全彩屏的亮度要在800—2000cd/m2,室外全彩屏的亮度要在5000—7500cd/m2,才能保证显示屏的正常工作，否则会因为亮度太低或太高看不清所显示的图像。亮度的大小主要由LED管芯晶体尺寸大小来决定。可视角度的大小直接决定显示屏受众的多少，故而角度越大越好。而其大小主要由管芯的封装方式来决定。

2: brightness and visual angle: indoor full color brightness to the 800 - 2000 CD / m2, outdoor full color brightness to in the normal work of the 5000 - 7500cd/m2. In order to ensure that the display, otherwise it will because the brightness is too low or too high to see not clear as shown in the image. The size of the brightness is mainly determined by the size of the LED tube core. The size of the visual angle directly determines the number of the audience, therefore, the larger the angle, the better. And its size is mainly determined by the tube core package.

3：白平衡效果：白平衡效果是显示屏最重要的指标之一，色彩学上当红绿蓝三原色的比例为1：4.6：0.16时才会显示出纯正的白色，如果实际比例有一点偏差则会出现白平衡的偏差，一般要注意白色是否有偏蓝色，偏黄绿色现象。车载LED显示屏厂家介绍白平衡的好坏主要有显示屏的控制系统来决定，管芯对色彩的还原性也有影响。

3: white balance: white balance is the most important indicator of the display, color science popular green, blue three primary colors of the proportion of 1:4.6:0.16 will show out of pure white, if the proportion of the actual deviation will appear the deviation of the white balance, to pay attention to whether the white bluish and yellowish green. Car LED display manufacturers to introduce white balance is good or bad there is a display control system to decide, the core of the color of the reduction of the impact.

4：有无色块色差：色块是指相邻模组之间存在较明显的色差，颜色的过渡以模块为单位了，引起色块现象主要是由控制系统较差，灰度等级不高，扫描频率较低造成的。

4: there is no color color: color is that there is obvious difference between adjacent module, the transition of color to module for the unit, causing color phenomenon is mainly caused by the control system is poor, the gray level is not high, scanning frequency lower.

5：色彩的还原性：色彩的还原性是指显示屏对色彩的还原性，既显示屏显示的色彩要与播放源的色彩保持高度一致，这样才能保证图像的真实感。

5: the reduction of color: the reduction of color is the color of the display screen to restore the color, both the color of the display and the source of color to maintain a high degree of consistency, so as to ensure the authenticity of the image.

6：有无马赛克、死点现象：马赛克是指显示屏上出现单元模组的颜色不均匀是的效果，常亮或常黑的小四方块，既模组坏死现象，其主要原因为显示屏所采用的接插件质量不过关。死点指显示屏上出现的常亮或常黑的单个点，死点的多少主要由管芯的好坏来决定。

6: mosaic, dead phenomenon: mosaic is that appears on the display module of uneven color is the effect, often bright or black four square, both module necrosis phenomenon, the main reason for the display of the connector quality does not pass. The dead point refers to the single point screen appears often bright or often black, the number of dead is mainly composed of a pipe core is determined.