The led display is important new flat panel display, due to its high brightness, clear pictures, colourful, make it in the public domain monolith, multimedia display many advertising hoardings, movie kanban will using LED to display market space, so great. We judge a full-color display screen is good or bad, can mainly from the following several aspects to evaluate:
1.Consistency.
Full color LED screen is better, the consistency of the whole screenful of balancing brightness, without obvious color piece.
2.Bad point
Indoor LED display bad point is not more than 0.03%, outdoor LED screen bad point should be no more than 0.3 percent, and for discrete shape.
3.Safety
There is no potential safety hazard, leakage current, floor drain current shall not exceed 3.5 mA (ac RMS); Resistance point intensity, led screen can 50Hz, 1500V (ac RMS) experiments voltage Lmin should not happen insulation breakdown, At the same time led panel screen in fuse and switching power supply place is due warning signs.
4.Appearance of
The LED display screen outer frame no significant scratches. Outdoor LED display screen pixels pipe installation should be consistent, without loosening and tube and shell cracking phenomena?
5.Structure of
The LED screen sections can adopt aluminum, steel, wood and other materials, requirement firm structure, beautiful.
6.Flatness
The led panel screen surface roughness in + 1mm within, in order to ensure that the display images not distortions, local convex or recession will lead to the display screen viewing angles appear blind Angle.
7. Brightness and viewing angles
Indoor full color brightness in 800cd/m&sup 2, Above, outdoor full color brightness in 1500 CD/m&sup 2, Above, to guarantee the normal work of the led sign screen, otherwise, it will because brightness is too low and couldn't see clearly shown in the image. The size of the visible Angle directly determine how many of the display screen of audience, so the bigger the better. The size of the visible Angle mainly by tube core encapsulation way to decide.
8. Colour of reducing
Colorific reducible refers to the display screen to colorific reductive ability, namely the display screen display colors with broadcast source color maintain highly consistent, such ability assure image corporeality.
9. Without Mosaic, dead spots phenomenon
Mosaic refers to appear on the display screen ChangLiang or often black small four squares, namely module necrosis phenomenon, the main reason for the display screen adopted the connectors quality closes nevertheless. Dead spots refers to the display screen ChangLiang or often appear on the single point, dead spots black how much the stand or fall of mainly by tube core to decide.
10. Without color piece
Color piece refers to adjacent among modules are with clear off color, color 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, cause. |
