1. The screen surface smoothness of iri: 1mm in hospital, in order to ensure that the display images within distortions, local convex not can lead to display or recessed viewing angles appear blind Angle. The stand or fall of flatness mainly by production process decision.

2. Brightness and visual Angle: indoor in full color brightness 800cd/m2 over the full color brightness, outdoor in 1500cd/m2 above, can guarantee the normal work of the display screen brightness is too low, otherwise, it will because see less clearly shown in the image. The size of the brightness mainly by the stand or fall of LED tube core decision.

The size of the visual Angle of the screen directly determine how many, therefore audience bigger is better. The size of the visible Angle mainly by tube core encapsulation way to decide.

3. White balance effect: white balance effect is one of the most important indicators led display screen. Red, green, blue in color science ratio of 1:4. Color when it lost. 16 will display the pure white, if the actual percentage off a little bit will appear white balance deviation, general should pay attention to whether have bluish white, partial yellow-green phenomenon. White balance quality control system mainly by screen decided to colorific, tube core of reducing may also be affected.

4. Colorific reducible: colorific reducible to colorific refers to display the pollution, and the colour of screen shows both the colour with broadcast to maintain highly consistent source, so that we can guarantee the image corporeality.

5. Whether Mosaic, dead spots phenomenon: Mosaic refers to appear on screen ChangLiang or often black small four square, already module necrosis phenomenon, the main reason for display the connectors quality closes nevertheless.
Dead spots refers to appear on screen ChangLiang or often black single point, how many dead spots depends mainly by tube core will decide.

6. Without color piece: color piece refers to between adjacent module is clear off color, the color of transition to module for unit, cause color piece phenomenon is mainly composed of control system is poorer, gray level is not high, scan lower frequency creates

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